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Urban growth and human impacts on the environment have forced animals to adjust to habitat fragmentation and reduced home ranges. Capuchin monkeys are known for their great social and behavioral flexibility, occupying even highly urbanized environments in a way that the time budget of this primate in synanthropic situation may be affected by the area they inhabit. This study aims to analyze the activity budget of a group of Sapajus nigritus living in an anthropized area, 1) comparing the behavioral frequencies in urbanized areas and forest fragments; 2) comparing behavioral frequencies in different sex-age classes. During the study, the number of individuals ranged from 35 to 40 individuals identified based on sex-age classes. Behavioral data were collected using the instantaneous scan sampling method, for two minutes with eight-minute intervals. We obtained 319 scans over 28 days, distributed between November 2021 and June 2022, with eight hours per day. We compared the behaviors different areas and between sex-age classes using the Kruskal-Wallis's test. Overall, the group performed a higher frequency of traveling (21.22%), followed by foraging (18.07%), feeding (16.57%) and vigilance (15.61%). The frequency of behaviors varied between areas, with vigilance, social, resting, interaction with humans and self-activity more frequent in urbanized areas compared to forest fragments. We also found variation between the sex-age classes, primarily with juveniles foraging more and adults performing more vigilance. The differences in the behaviors performed by the group express the behavioral flexibility of S. nigritus, adapting its activity pattern according to the area occupied.

O crescimento urbano e os impactos humanos no ambiente forçaram os animais a se adaptarem à fragmentação de hábitat e à redução da área de vida. Os macacos-prego são conhecidos por sua flexibilidade social e comportamental, ocupando até mesmo ambientes altamente urbanizados, sendo que seu padrão de atividades pode ser afetado pela área que habitam. Este estudo teve como objetivo analisar o padrão de atividades de um grupo de Sapajus nigritus vivendo em área antropizada, com base em: 1) comparação das frequências comportamentais em áreas urbanizadas e fragmentos florestais; e 2) comparação das frequências comportamentais em diferentes classes sexo-etárias. Durante o estudo, o número de indivíduos variou entre 35 e 40 indivíduos, identificados a partir de classes sexo-etárias. Os dados comportamentais foram coletados pelo método scan sampling, durante dois minutos com intervalo de oito minutos. Foram obtidos 319 scans ao longo de 28 dias (entre novembro de 2021 e junho de 2022), por oito horas diárias. Comparamos os comportamentos em diferentes áreas e entre classes sexo-etárias através do teste de Kruskal-Wallis. Em geral, o grupo apresentou frequência maior de deslocamento (21,22%), seguido de forrageio (18,07%), alimentação (16,57%) e vigilância (15,61%). A frequência dos comportamentos variou entre áreas (vigilância, social, descanso, interação com humanos e autoatividade foram mais frequentes em áreas urbanizadas) e classes sexo--etárias (principalmente com os juvenis forrageando mais e os adultos realizando mais vigilância). As diferenças nos comportamentos realizados pelo grupo expressam a flexibilidade comportamental de S. nigritus, adaptando seu padrão de atividade conforme a área ocupada.

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Linear infrastructures such as agricultural irrigation channels produce physical changes and negative impacts to habitats, wildlife populations, communities, and ecosystems. Open irrigation channels act as a pitfall for wildlife and can affect vertebrates of all sizes. Nonetheless, small channels have received relatively little attention by conservation biologists. The objective of this study was to analyze vertebrate species richness and mortality in relation to different sections of an irrigation channel system and the surrounding landscape characteristics. For two years, we conducted monthly surveys along an open-channel irrigation system to estimate its effect on vertebrates through records of dead and alive individuals. We examined the spatial relation of species richness and mortality with transects using a canonical correspondence analysis and chi-squared tests to determine possible variations in the different structures of the channel and seasonality. Further, a landscape diversity index was used to analyze the importance of surrounding habitat structure and composition on these parameters. Most vertebrates (61%) were found dead, small mammals and reptiles were the most affected. Our results indicate that mortality of small vertebrates varies depending on species, structures of the open-channel agricultural irrigation system (i.e., concrete channel and floodgates), seasonality (i.e., wet, and dry), and landscape heterogeneity (i.e., high, medium, and low landscape diversity). The open-channel irrigation system is a threat to populations of small vertebrates in anthropized landscapes, conservation efforts should be directed at protecting water bodies and restructuring the open-channel agricultural irrigation system to avoid mortality of species such as small rodents (M. mexicanus) and reptiles (C. triseriatus, B. imbricata, and Thamnophis spp.).

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Background: Anthropogenic activities significantly impact natural ecosystems, leading to alterations in plant and pollinator diversity and abundance. These changes often result in shifts within interacting communities, potentially reshaping the structure of plant-pollinator interaction networks. Given the escalating human footprint on habitats, evaluating the response of these networks to anthropization is critical for devising effective conservation and management strategies. Methods: We conducted a comprehensive review of the plant-pollinator network literature to assess the impact of anthropization on network structure. We assessed network metrics such as nestedness measure based on overlap and decreasing fills (NODF), network specialization (H2'), connectance (C), and modularity (Q) to understand structural changes. Employing a meta-analytical approach, we examined how anthropization activities, such as deforestation, urbanization, habitat fragmentation, agriculture, intentional fires and livestock farming, affect both plant and pollinator richness. Results: We generated a dataset for various metrics of network structure and 36 effect sizes for the meta-analysis, from 38 articles published between 2010 and 2023. Studies assessing the impact of agriculture and fragmentation were well-represented, comprising 68.4% of all studies, with networks involving interacting insects being the most studied taxa. Agriculture and fragmentation reduce nestedness and increase specialization in plant-pollinator networks, while modularity and connectance are mostly not affected. Although our meta-analysis suggests that anthropization decreases richness for both plants and pollinators, there was substantial heterogeneity in this regard among the evaluated studies. The meta-regression analyses helped us determine that the habitat fragment size where the studies were conducted was the primary variable contributing to such heterogeneity. Conclusions: The analysis of human impacts on plant-pollinator networks showed varied effects worldwide. Responses differed among network metrics, signaling nuanced impacts on structure. Activities like agriculture and fragmentation significantly changed ecosystems, reducing species richness in both pollinators and plants, highlighting network vulnerability. Regional differences stressed the need for tailored conservation. Despite insights, more research is crucial for a complete understanding of these ecological relationships.

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Mammals in drylands face environmental challenges exacerbated by climate change. Currently, human activity significantly impacts these environments, and its effects on the energy demands experienced by individuals have not yet been determined. Energy demand in organisms is managed through elevations in glucocorticoid levels, which also vary with developmental and health states. Here, we assessed how anthropization, individual characteristics, and seasonality influence hair glucocorticoid concentration in the Darwin's leaf-eared mouse (Phyllotis darwini) inhabiting two areas with contrasting anthropogenic intervention in a semi-arid ecosystem of northern Chile. Hair samples were collected (n = 199) to quantify hair corticosterone concentration (HCC) using enzyme immunoassays; additionally, sex, body condition, and ectoparasite load were recorded. There were no differences in HCC between anthropized areas and areas protected from human disturbance; however, higher concentrations were recorded in females, and seasonal fluctuations were experienced by males. The results indicate that animals inhabiting semi-arid ecosystems are differentially stressed depending on their sex. Additionally, sex and season have a greater impact on corticosterone concentration than anthropogenic perturbation, possibly including temporal factors, precipitation, and primary production. The influence of sex and seasonality on HCC in P. darwini make it necessary to include these variables in future stress assessments of this species.

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Background: Land use change is a key catalyst of global biodiversity loss and ecosystem degradation. Deforestation and conversion of natural habitats to agricultural or urban areas can profoundly disrupt plant-flower visitor interactions by altering their abundances and distribution. Yet, specific studies analyzing the effects of land use change on the structure of networks of the interactions between particular groups of flower visitors and their plants are still scarce. Here, we aimed to analyze how converting native habitats affects the species composition of butterfly communities and their plants, and whether this, in turn, leads to changes in the structure of interaction networks in the modified habitats. Methods: We performed bi-monthly censuses for a year to record plant-butterfly interactions and assess species diversity across three habitat types, reflecting a land-use change gradient. From original native juniper forest to urban and agricultural zones in central Mexico, one site per land use type was surveyed. Interactions were summarized in matrices on which we calculated network descriptors: connectance, nestedness and modularity. Results: We found highest butterfly diversity in native forest, with the most unique species (i.e., species not shared with the other two sites). Agricultural and urban sites had similar diversity, yet the urban site featured more unique species. The plant species richness was highest in the urban site, and the native forest site had the lowest plant species richness, with most of the plants being unique to this site. Butterfly and plant compositions contrasted most between native forest and modified sites. Network analysis showed differences between sites in the mean number of links and interactions. The urban network surpassed agriculture and native forest networks in links, while the native forest network had more interactions than the agriculture and urban networks. Native plants had more interactions than alien species. All networks exhibited low connectance and significant nestedness and modularity, with the urban network featuring the most modules (i.e., 10 modules). Conclusions: Converting native habitats to urban or agricultural areas reshapes species composition, diversity and interaction network structure for butterfly communities and plants. The urban network showed more links and modules, suggesting intricate urban ecosystems due to diverse species, enhanced resources, and ecological niches encouraging interactions and coexistence. These findings emphasize the impacts of land use change on plant-butterfly interactions and the structure of their interaction networks.

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Deforestation, agriculture, farmyard animal husbandry, and urbanization are known to be the main causes of biodiversity loss and habitat fragmentation. The present study evaluated the role of anthropization in modulating Muscidae (Diptera) assemblages in the Humid Chaco ecoregion of Argentina, by testing the biotic homogenization and intermediate disturbance hypotheses. The study focused on natural, rural, and urban habitats in San Lorenzo Department, Chaco Province, where sarcosaprophagous muscid flies were surveyed. A total of 1,343 muscid flies were captured and identified to 7 genera and 24 species and morphospecies. We observed the effect of anthropization on the structuring of the assemblages and the presence of exotic species associated with human activity resulting from biotic homogenization. The highest abundance was recorded in the urban habitat, while the highest species richness and diversity (Shannon-Wienner and Hill's numbers) were found in the rural habitat, supporting the intermediate disturbance hypothesis. Several species are classified as indicators of habitat as well as according to their index of synanthropy. Our results provide valuable information about the use of sarcosaprophagous muscids as indicators of disturbance of natural habitats and about possible health risks related to this family of Calyptratae flies previously unsurveyed in northeastern Argentina. This information could be used in the ecological, agronomy, sanitary, and forensic fields.

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Brazil's Caatinga drylands is under extensive environmental deterioration, with 38% of its natural cover already lost. There is a need for a better understanding of the effects of such degradation on Caatinga's rich and singular biota. Bats form a large part of this biota, and are pointed as good bioindicators. Here, we used the micronucleus test -an easy-to-use, accessible and cost-effective in vivo approach- to detect DNA damage in cells from bats of different species and feeding habits in three protected areas in the Caatinga, comparing them with samples from an industrial sugarcane plantation. We hypothesized that environmental disturbance would reflect in DNA damage, with lower levels of damage in the less disturbed protected areas. The frequency of micronucleated cells differed significantly between sites and feeding habits (carnivores > insectivores > frugivores > nectarivores > hematophagous) but did not differ between sexes. Alarmingly, the highest levels of DNA damage were in two strictly protected areas (Seridó and Raso da Catarina Ecological Stations). Glossophaga and Anoura were the genera with more damaged cells, and had, respectively, 1.48 and 3.53 times more micronucleated cells (average of 19.33 and 22.67 cells, respectively) than individuals from the same genera from the area with least damaged cells (average of 7.80 and 5.00 cells, respectively). Our analysis is a warning call for an in-depth investigation on the effects of both genotoxic contamination and environmental stressors on bats and other species in Brazil's Caatinga, including the role that historical human-induced processes -like the intense use of agrochemicals- may have had in the region.

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As a result of environmental change by anthropic action, animal species that inhabit these areas may suffer the effects of it on their phenotypes as a consequence of adapting to these conditions. In the case of social wasps, cuticular chemical compounds may be influenced, since these vary depending on genetic and environmental factors. However, few studies have investigated the synanthropic effects over the cuticular surface of social wasps. Therefore, the aim of this study was to investigate how cuticular compounds vary according to the different degrees of human activity and test the hypothesis that cuticular compounds of social wasps are affected by the level of anthropic activity in which their nests are found. Data on the cuticular chemical compounds composition of colonies of 3 species of social wasps were used along with the level of anthropization of their nesting sites in four municipalities in the state of Mato Grosso do Sul, Brazil. From the geographical coordinates of the sampling sites, the percentages of urban construction areas, agriculture, water body, vegetation and exposed land were calculated, and the nesting sites of the colonies were classified as more or less anthropized areas. The chemical profile was determined by extraction of cuticular compounds and analyzed by Gas Chromatography coupled to Mass Spectrometer (GC-MS). The results show that the cuticular chemical composition of the individuals of these species is affected by the level of anthropization in their nesting sites, with a qualitative and quantitative variation that must be tied not only to genetic differences, but, above all, to the local environmental conditions to which their colonies are subjected.(AU)

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In most species, several factors like time of emergence, age at maturation, reproductive life span, survival of males and females, mating behavior, differential resource use, and migration patterns may affect the adult sex ratio. Anthropogenic landscape transformation is known to change diversity, favoring colonization by exotic species but other populational parameters, such as the sex ratio, have not been assessed. The aim of the present study was to describe the sex-ratio patterns of adult necrophagous blow flies captured using carrion-baited traps along habitats representing different levels of human impact. We describe the sex bias for four species: the exotic Chrysomya albiceps, Chrysomya megacephala, Chrysomya putoria, and the native Cochliomyia macellaria. Three types of habitats were selected: highly anthropized (urbanized), moderately anthropized (rural), and native forest (natural) within a humid subtropical ecoregion in Northeastern Argentina. We found an overall trend to female bias among the four species when considering the total number of each sex. However, our study showed a changing sex-ratio pattern along the gradient of human influence. Our results indicate that a higher likelihood of trapping more males in unsuitable habitats seems to be widespread among blow flies. Urban exploiters, such as Ch. megacephala and Ch. putoria, locally shifted their trends, becoming male-biased in natural habitats. The opposite trend was detected in the urban avoider Co. macellaria (which shifted to male-biased in urban habitats). The exception was Ch. albiceps, whose sex proportion did not shift to a male-biased sex ratio. The results of this study highlight the changing sex-ratio patterns displayed by Calliphoridae in response to different conditions along a human-influence gradient. The biological traits and underlying mechanisms promoting the intraspecific changes of the sex ratio are discussed.

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Human transformation of natural habitats facilitates pathogen transmission between domestic and wild species. The guigna (Leopardus guigna), a small felid found in Chile, has experienced habitat loss and an increased probability of contact with domestic cats. Here, we describe the interspecific transmission of feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV) between domestic cats and guignas and assess its correlation with human landscape perturbation. Blood and tissue samples from 102 free-ranging guignas and 262 domestic cats were collected and analyzed by PCR and sequencing. Guigna and domestic cat FeLV and FIV prevalence were very similar. Phylogenetic analysis showed guigna FeLV and FIV sequences are positioned within worldwide domestic cat virus clades with high nucleotide similarity. Guigna FeLV infection was significantly associated with fragmented landscapes with resident domestic cats. There was little evidence of clinical signs of disease in guignas. Our results contribute to the understanding of the implications of landscape perturbation and emerging diseases.

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Antimicrobial resistance genes (ARGs) are environmental pollutants and anthropization indicators. We evaluated human interference in the marine ecosystem through the ocurrence and quantification (real-time PCRs) of 21 plasmid-mediated ARGs in enema samples of 25 wild seabirds, upon admission into rehabilitation: kelp gull (Larus dominicanus, n = 14) and Magellanic penguin (Spheniscus magellanicus, n = 11). Overall, higher resistance values were observed in kelp gulls (non-migratory coastal synanthropic) in comparison with Magellanic penguins (migratory pelagic non-synanthropic). There were significant differences between species (respectively, kelp gull and Magellanic penguin): ARGs occurrence (bla TEM [p = 0.032]; tetM [p = 0.015]; tetA [p = 0.003]; and sulII [p = 0.007]), mean number of ARGs per sample (p = 0.031), ARGs mean load percentage (aadA [p = 0.045], tetA [p = 0.031], tetM [p = 0.016], bla TEM [p = 0.032], sulII [p = 0.008]), percentage of genes conferring resistance to an antimicrobial class (betalactams [p = 0.036] and sulfonamides [p = 0.033]), mean number of genes conferring resistance to one or more antimicrobial classes (p = 0.024]), percentage of multiresistant microbiomes (p = 0.032), and clustering (p = 0.006). These differences are likely due to these species' contrasting biology and ecology - key factors in the epidemiology of ARGs in seabirds. Additionally, this is the first report of mecA in seabirds in the Americas. Further studies are necessary to clarify the occurrence and diversity of ARGs in seabirds, and their role as potential sources of infection and dispersal within the One Health chain of ARGs.

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Antimicrobial resistance is a quintessential One Health issue, among the most serious 21st century global threats to human health. Seabirds may act as sentinels of natural and anthropogenic changes in the marine ecosystem health, including pollution by antimicrobial resistance genes (ARGs). We used real time PCR to identify and quantify 22 plasmid-mediated ARGs in the gastrointestinal microbiome of six wild seabird species, comparing an anthropized (Fernando de Noronha Archipelago - FNA) and a pristine biotope (Rocas Atoll - ROA), Brazil. Of 257 birds, 218 (84.8%) were positive to at least one ARG. ARG classes encoding resistance to tetracyclines (75.1%), quinolones (10.5%) and phenicols (10.5%) were the most prevalent, with tetracyclines significantly greater than the remaining classes (p < 0.05). Genes tet(S) (29.2%), tet(A) (28.8%), and tet(B) (24.9%) were the most commonly found and had a significantly greater prevalence when compared to the remaining ARGs (p < 0.05). The anthropized biotope presented statistically significant higher prevalence of sulfonamide- and quinolone-encoding ARGs in comparison with the pristine (respectively, p = 0.01 and p = 0.03), and higher sulII gene prevalence (p = 0.04), consistent with anthropogenic pressure. Migratory species (only present in ROA) showed statistically significant higher mcr-1 (polymyxins) and blaTEM (betalactam) prevalences (respectively, p = 0.009 and p = 0.02), and mcr-1 percentage load (p = 0.0079) in comparison with non-migratory. To our knowledge, this is the largest ARGs survey based on direct detection and quantification in seabirds worldwide, and the first to evaluate non-synanthropic species in oceanic islands. This is the first detection of mcr-1 in wild free-ranging seabirds in Brazil and in free-ranging migratory non-synanthropic seabirds worldwide. Our findings show the importance of biological and ecological factors, highlighting the role of seabirds as anthropization sentinels and ARGs-pollution environmental indicators (even in a pristine biotope), and their involvement in the One Health epidemiological chain of ARGs.

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Human-dominated environments alter the availability and quality of resources for many species, especially for scavengers that have large home ranges and plastic foraging behaviors that enable them to exploit novel resources. Along the western slope of the Andes, the modification of natural landscapes have resulted in significant declines in native prey, the introduction of non-native species, and an increase in the availability of anthropogenic resources. These factors have likely influenced the resources available to Andean condors (Vultur gryphus), however, data are lacking as to how condor's diet vary along their large latitudinal range. We evaluated differences in Andean condor diet along a ~2500 km latitudinal gradient in Chile from the heavily modified Central zone (32-34°S) to the more pristine Austral zone (44-56°S). We assessed diet composition through the identification of prey remains in condor pellets, and carbon and nitrogen isotope analysis of condor feathers and their primary prey identified from pellet analysis. Our results identified medium- and large-bodied domesticated mammals (ungulates) and introduced exotic species (lagomorphs) as common prey across the study area. Condors from the Central zone had the largest isotopic niche width, probably related to consumption of anthropogenic resources with distinctly high carbon isotope values indicative of C4-based foods likely acquired from landfills or corn-fed livestock. Isotopic niches for condors from the Southern and Austral zones almost completely overlapped. Andean condor diet is strongly influenced by local conditions determining differential access to prey sources. The high dependence of Andean condors on livestock across a large geographical area, and landfills in more (sub)urban areas, may help stabilize their populations via anthropogenic resources subsidies. Long-term dependence on such resources, however, may have health costs including contaminant exposure and greater mortality risk. These data will help identify potential threats related to resource availability and use, and better inform management and conservation decisions.

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Antimicrobial resistance is a global emerging public health issue whose presence and impact in wildlife are widely unknown. Antimicrobial resistance genes (ARGs) are considered environmental contaminants, suitable to evaluate the degree of anthropic impact on wildlife and the environment. We used a wild felid, the guigna (Leopardus guigna), as a sentinel for the presence of ARGs in anthropized and pristine areas across their entire distribution range in Chile. We evaluated fecal samples from 51 wild guignas, collected between 2009 and 2018. Real-time PCR essays were employed to detect and quantify 22 selected ARGs in their fecal microbiome. All animals (100%) were positive for at least one ARG. The most prevalent ARG families were those that confer resistance to tetracycline (88.2%) and beta-lactamase (68.9%), with tet(Q) (60.8%), tet(W) (60.8%), and blaTEM (66.7%) as the most prevalent ARGs. Multi-resistance profiles were observed in 43% of the guignas. Statistically significant differences were found between anthropized and pristine areas for tet(Q) (p = 0.014), tet(W) (p = 0.0037), tetracycline family (p = 0.027), multi-resistance profile prevalence (p = 0.043) and tet(W) quantification (p = 0.004). Two animals from anthropized landscapes were positive for mecA, a gene associated with Staphylococcus aureus and other staphylococci resistant to methicillin, while three animals from anthropized areas were positive for blaCTX-M, that encodes class A extended-spectrum beta-lactamase. Both genes have been identified in bacteria causing relevant nosocomial infections worldwide. This is the first study on ARGs in wild felids from Chile and the first detection of mecA in South American wild felids. We observed an association between the degree of landscape anthropization and ARG prevalence, confirming that ARGs are important indicators of wildlife exposure to human activity/presence, with a widespread distribution.

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The present work had the goal of assessing anthropization of mangroves in Mexico during the 2005-2015 period. We modified the Relative Integrated Anthropization Index (INRA in its Spanish acronym) method developed by Martínez-Dueñaz (Intrópica: 37-46, 2010) for its use in Mexico. The maps of the Mexican Mangrove Monitoring System of the National Commission for the Knowledge and Use of Biodiversity (SMMM CONABIO in its Spanish acronym) for the years 2005, 2010, and 2015 were classified into 10 land use categories and 21 subcategories. The relative anthropization values were obtained for subcategories and classes in the input maps through consultation with mangrove specialists and the results were integrated to calculate the INRA values in 500 m2 units. Our results showed an increase in the surface of most anthropic categories and a sustained increment of the mean INRA values at the national level.

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Bats are the second largest order of mammals, with varying feeding habits and great ecological significance. Anthropization has several important effects on animal communities and the Brazilian Cerrado, a Neotropical savannah, has been severely affected by human activity. The objective of this study was to evaluate phyllostomid bat assemblage distributions in the different landscape formations of a modified savannah. Using mist nets, we performed 36 sampling nights between 2015 and 2016. The sampling effort was 23,328 m².h and was equally distributed over three landscape formations: a large fragment, riparian forest, and small fragments. We compared capture rates, richness, diversity, similarity, and feeding guilds for the three formations. We captured 418 bats of 12 species belonging to the family Phyllostomidae. The most abundant species was Artibeus planirostris (Spix, 1823) (n = 126). We found no significant differences in capture rate or diversity between the areas, but there were differences in feeding guild representation. Frugivores species were the most abundant in the three areas. No gleaning insectivore or carnivore species were captured in the small fragments, and the large fragment contained no hematophages. The large fragment and the small fragments had the greatest similarity whereas the riparian forest and small fragments had the least similarity.

Os morcegos são a segunda maior ordem de mamíferos, com diversos hábitos alimentares e grande importância ecológica. A antropização possui diversos efeitos nas comunidades animais e o Cerrado Brasileiro, uma savana neotropical, tem sido severamente afetada pela atividade humana. O objetivo deste estudo foi avaliar a distribuição da assembleia de morcegos filostomídeos nas diferentes formações de paisagem de uma savana modificada. Utilizando redes de neblina, nós realizamos 36 noites de amostragem entre 2015 e 2016. O esforço amostral foi de 23.238 m².h igualmente distribuído entre três formações de paisagem: um fragmento grande, mata ciliar e pequenos fragmentos. Nós comparamos a taxa de captura, riqueza, diversidade, similaridade e guildas alimentares para as três formações. Foram capturados 418 morcegos de 12 espécies da família Phyllostomidae. A espécie mais abundante foi Artibeus planirostris (Spix, 1823) (n = 126). Nós não encontramos diferenças significativas na taxa de captura ou diversidade entre as áreas, mas houve diferenças na representatividade das guildas alimentares. As espécies frugívoras foram as mais abundantes nas três áreas. Não houve capturas de espécies insetívoras catadoras ou carnívoras nos pequenos fragmentos e de hematófagos no fragmento grande. O fragmento grande e os pequenos tiveram a maior similaridade entre as formações, enquanto a mata ciliar e os fragmentos pequenos tiveram a menor similaridade.

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ABSTRACT Bats are the second largest order of mammals, with varying feeding habits and great ecological significance. Anthropization has several important effects on animal communities and the Brazilian Cerrado, a Neotropical savannah, has been severely affected by human activity. The objective of this study was to evaluate phyllostomid bat assemblage distributions in the different landscape formations of a modified savannah. Using mist nets, we performed 36 sampling nights between 2015 and 2016. The sampling effort was 23,328 m².h and was equally distributed over three landscape formations: a large fragment, riparian forest, and small fragments. We compared capture rates, richness, diversity, similarity, and feeding guilds for the three formations. We captured 418 bats of 12 species belonging to the family Phyllostomidae. The most abundant species was Artibeus planirostris (Spix, 1823) (n = 126). We found no significant differences in capture rate or diversity between the areas, but there were differences in feeding guild representation. Frugivores species were the most abundant in the three areas. No gleaning insectivore or carnivore species were captured in the small fragments, and the large fragment contained no hematophages. The large fragment and the small fragments had the greatest similarity whereas the riparian forest and small fragments had the least similarity.

RESUMO Os morcegos são a segunda maior ordem de mamíferos, com diversos hábitos alimentares e grande importância ecológica. A antropização possui diversos efeitos nas comunidades animais e o Cerrado Brasileiro, uma savana neotropical, tem sido severamente afetada pela atividade humana. O objetivo deste estudo foi avaliar a distribuição da assembleia de morcegos filostomídeos nas diferentes formações de paisagem de uma savana modificada. Utilizando redes de neblina, nós realizamos 36 noites de amostragem entre 2015 e 2016. O esforço amostral foi de 23.238 m².h igualmente distribuído entre três formações de paisagem: um fragmento grande, mata ciliar e pequenos fragmentos. Nós comparamos a taxa de captura, riqueza, diversidade, similaridade e guildas alimentares para as três formações. Foram capturados 418 morcegos de 12 espécies da família Phyllostomidae. A espécie mais abundante foi Artibeus planirostris (Spix, 1823) (n = 126). Nós não encontramos diferenças significativas na taxa de captura ou diversidade entre as áreas, mas houve diferenças na representatividade das guildas alimentares. As espécies frugívoras foram as mais abundantes nas três áreas. Não houve capturas de espécies insetívoras catadoras ou carnívoras nos pequenos fragmentos e de hematófagos no fragmento grande. O fragmento grande e os pequenos tiveram a maior similaridade entre as formações, enquanto a mata ciliar e os fragmentos pequenos tiveram a menor similaridade.

RESUMO

Bats are the second largest order of mammals, with varying feeding habits and great ecological significance. Anthropization has several important effects on animal communities and the Brazilian Cerrado, a Neotropical savannah, has been severely affected by human activity. The objective of this study was to evaluate phyllostomid bat assemblage distributions in the different landscape formations of a modified savannah. Using mist nets, we performed 36 sampling nights between 2015 and 2016. The sampling effort was 23,328 m².h and was equally distributed over three landscape formations: a large fragment, riparian forest, and small fragments. We compared capture rates, richness, diversity, similarity, and feeding guilds for the three formations. We captured 418 bats of 12 species belonging to the family Phyllostomidae. The most abundant species was Artibeus planirostris (Spix, 1823) (n = 126). We found no significant differences in capture rate or diversity between the areas, but there were differences in feeding guild representation. Frugivores species were the most abundant in the three areas. No gleaning insectivore or carnivore species were captured in the small fragments, and the large fragment contained no hematophages. The large fragment and the small fragments had the greatest similarity whereas the riparian forest and small fragments had the least similarity.(AU)

Os morcegos são a segunda maior ordem de mamíferos, com diversos hábitos alimentares e grande importância ecológica. A antropização possui diversos efeitos nas comunidades animais e o Cerrado Brasileiro, uma savana neotropical, tem sido severamente afetada pela atividade humana. O objetivo deste estudo foi avaliar a distribuição da assembleia de morcegos filostomídeos nas diferentes formações de paisagem de uma savana modificada. Utilizando redes de neblina, nós realizamos 36 noites de amostragem entre 2015 e 2016. O esforço amostral foi de 23.238 m².h igualmente distribuído entre três formações de paisagem: um fragmento grande, mata ciliar e pequenos fragmentos. Nós comparamos a taxa de captura, riqueza, diversidade, similaridade e guildas alimentares para as três formações. Foram capturados 418 morcegos de 12 espécies da família Phyllostomidae. A espécie mais abundante foi Artibeus planirostris (Spix, 1823) (n = 126). Nós não encontramos diferenças significativas na taxa de captura ou diversidade entre as áreas, mas houve diferenças na representatividade das guildas alimentares. As espécies frugívoras foram as mais abundantes nas três áreas. Não houve capturas de espécies insetívoras catadoras ou carnívoras nos pequenos fragmentos e de hematófagos no fragmento grande. O fragmento grande e os pequenos tiveram a maior similaridade entre as formações, enquanto a mata ciliar e os fragmentos pequenos tiveram a menor similaridade.(AU)

Assuntos

RESUMO

Bats are the second largest order of mammals, with varying feeding habits and great ecological significance. Anthropization has several important effects on animal communities and the Brazilian Cerrado, a Neotropical savannah, has been severely affected by human activity. The objective of this study was to evaluate phyllostomid bat assemblage distributions in the different landscape formations of a modified savannah. Using mist nets, we performed 36 sampling nights between 2015 and 2016. The sampling effort was 23,328 m².h and was equally distributed over three landscape formations: a large fragment, riparian forest, and small fragments. We compared capture rates, richness, diversity, similarity, and feeding guilds for the three formations. We captured 418 bats of 12 species belonging to the family Phyllostomidae. The most abundant species was Artibeus planirostris (Spix, 1823) (n = 126). We found no significant differences in capture rate or diversity between the areas, but there were differences in feeding guild representation. Frugivores species were the most abundant in the three areas. No gleaning insectivore or carnivore species were captured in the small fragments, and the large fragment contained no hematophages. The large fragment and the small fragments had the greatest similarity whereas the riparian forest and small fragments had the least similarity.(AU)

Os morcegos são a segunda maior ordem de mamíferos, com diversos hábitos alimentares e grande importância ecológica. A antropização possui diversos efeitos nas comunidades animais e o Cerrado Brasileiro, uma savana neotropical, tem sido severamente afetada pela atividade humana. O objetivo deste estudo foi avaliar a distribuição da assembleia de morcegos filostomídeos nas diferentes formações de paisagem de uma savana modificada. Utilizando redes de neblina, nós realizamos 36 noites de amostragem entre 2015 e 2016. O esforço amostral foi de 23.238 m².h igualmente distribuído entre três formações de paisagem: um fragmento grande, mata ciliar e pequenos fragmentos. Nós comparamos a taxa de captura, riqueza, diversidade, similaridade e guildas alimentares para as três formações. Foram capturados 418 morcegos de 12 espécies da família Phyllostomidae. A espécie mais abundante foi Artibeus planirostris (Spix, 1823) (n = 126). Nós não encontramos diferenças significativas na taxa de captura ou diversidade entre as áreas, mas houve diferenças na representatividade das guildas alimentares. As espécies frugívoras foram as mais abundantes nas três áreas. Não houve capturas de espécies insetívoras catadoras ou carnívoras nos pequenos fragmentos e de hematófagos no fragmento grande. O fragmento grande e os pequenos tiveram a maior similaridade entre as formações, enquanto a mata ciliar e os fragmentos pequenos tiveram a menor similaridade.(AU)

Assuntos

RESUMO

Los cambios en el paisaje donde se ubican las cuencas hidrográficas pueden afectar la corriente de diferentes maneras. Con el fin de explorar esta idea, se recogieron los cangrejos de agua dulce del género Aegla Leach, 1820 en la región subtropical del sur de Brasil. También se midió una serie de características del paisaje y las variables físico-químicas en los arroyos de colección y el entorno con el fin de determinar qué factores afectan la ocurrencia de estos crustáceos. Un total de 167 individuos de Aegla fueron recolectados en 21 arroyos. La colección estaba compuesta por tres especies: A. odebrechtii, A. platensis y A. singularis. La ocurrencia de A. platensis estuvo influenciada por variables fisicoquímicas (carbono total y carbono orgánico total) y morfometría (suma de curvas de nivel). La ocurrencia de A. singularis estuvo influenciada por el uso de la tierra (pastos y suelo expuesto y agricultura) y la morfometría (suma de curvas de nivel). Sólo un pequeño número de A. odebrechtii fueron recolectados y su ocurrencia fue influenciada por el uso de la tierra (pastos y suelo expuesto y la agricultura). La topografía del área estudiada limita los tipos de uso de la tierra y las áreas menos favorables para la agricultura (zonas más montañosas) tienen más vegetación ribereña (o menos estrés antrópico). Como resultado, estas áreas están menos sujetas a cambios en la calidad del agua, lo que se refleja en la distribución de las especies de Aegla.(AU)

Changes in the landscape where watersheds are located may affect the stream biota in different ways. In order to explore this idea, we collected freshwater crabs of the genus Aegla Leach, 1820 in subtropical region of southern Brazil. We also measured a number of landscape features and physico-chemical variables in the collection streams and surroundings in order to ascertain which factors affect the occurrence of these crustaceans. A total of 167 individuals of Aegla were collected in 21 streams. The collection was comprised of three species: A. odebrechtii, A. platensis, and A. singularis. The occurrence of A. platensis was influenced by physico-chemical variables (total carbon and total organic carbon) and stream morphometry factors (level curves sum). The occurrence of A. singularis was influenced by land use (pasture and exposed soil and agriculture) and the stream morphometry (level curves sum). Only a small number of A. odebrechtii were collected and their occurrence was influenced by land use (pasture and exposed soil and agriculture). The topography of the area studied limits the types of land use and areas that are less favorable for agriculture (more hilly areas) are have more riparian vegetation (or less anthropic stress). As a result, these areas are less subject to changes in water quality, which is reflected in the distribution of Aegla species.(AU)

Assuntos