RESUMO
Several strategies have been adopted to optimize biodiversity conservation. The use of fauna and flora species as flagships can help increase public commitment and raise funds for their conservation. However, species choices must be well balanced, considering not only intrinsic aspects (e.g., risk of extinction and ecological role), but also social, cultural, and economic aspects of the region where the flagship will be adopted. Brazil is one of the countries with the greatest diversity on the planet. Nevertheless, there are several challenges associated with natural resources conservation. Flagships have been adopted informally for decades throughout the country but there are no efforts to evaluate these strategies results for the preservation of the selected species. The aim of this study was to carry out an extensive survey on regional flagship species, their conservation status, level of endemism, and domestic legislation currently in force for their protection or human use. A total of 62 flagships were identified, with at least one species of flora and one of fauna for each of the 27 Brazilian Federative Units. The animals most commonly used as regional symbols are birds, followed by mammals. Flora species used as regional symbols are quite diverse. However, they are all somehow used by humans. As for legal protection, there are government measures for endangered species. Nevertheless, most species used as regional symbols are not at risk of extinction and, for this reason, do not receive any legal protection. Moreover, while some flagships are endemic, others are alien species, indicating that this criterion is not considered when choosing regional symbols. In the overall analysis it was noted that species choice could be optimized to highlight the national biodiversity. Despite efforts to establish legal measures for their preservation, few effective results have been observed. Therefore, improved effective measures for their conservation should be adopted to guarantee the effectiveness of flagship species for biodiversity conservation.
Assuntos
Biodiversidade , Conservação dos Recursos Naturais , Animais , Brasil , Espécies em Perigo de Extinção , Governo , HumanosRESUMO
The aim of this study is to characterize the background noise and abiotic and anthropogenic sound sources in the sector with greater anthropogenic use of the Cananéia estuary. The results show that the relative amplitude of background noise decreased with the increase of frequency range, and was higher with greater number of vessels, wind speed and during flood tide. Weekends and vacation periods were shown to be important dates during which background noise increased in the region. The influence of the tide and the wind speed on the relative amplitude was dependent on the frequency range analyzed. Therefore, both abiotic and anthropogenic sound sources were observed to be important factors regarding an increase in background noise in Cananéia. The importance of the continuity of vessel regulation in the region and of future studies that identify whether such noises alter parameters from the sound repertoire of the cetacean species in the region.
Assuntos
Acústica , Estuários , Brasil , Ruído/efeitos adversos , SomRESUMO
Recent studies have proposed latitudinal variations for the whistles of Sotalia guianensis, since parameters of frequency increase from the southernmost distribution of the species (State of Santa Catarina, Brazil) toward the North. The last study on the whistles of S. guianensis, conducted in Costa Rica, confirmed the geographical variation of whistles, regardless of frequency responses used in the samples. Initial and minimum frequencies of whistles of the Costa Rican populations were higher than were the frequencies of Brazilian populations. In this current study, the whistles of S. guianensis were recorded with a sampling frequency of 48 kHz, the highest frequency band used in Brazilian studies. The initial and minimum frequency of whistles recorded and analyzed were similar to parameters of Costa Rican populations and show little or no difference when compared to the average of each study. Therefore, whistle frequency variables do not increase with latitude. It is likely that variations in acoustic parameters S. guianensis are mainly linked to environmental characteristics of the habitats in which the populations occur. Thus, the repertoire sound S. guianensis appears linked to similar environments with similar physical characteristics and not linked to population characteristics (dialects).
Assuntos
Golfinhos/classificação , Golfinhos/fisiologia , Vocalização Animal/classificação , Acústica , Animais , Brasil , Ecossistema , Oceanos e Mares , Espectrografia do Som , Especificidade da Espécie , Fatores de TempoRESUMO
Most techniques used for estimating the age of Sotalia guianensis (van Beneden, 1864) (Cetacea; Delphinidae) are very expensive, and require sophisticated equipment for preparing histological sections of teeth. The objective of this study was to test a more affordable and much simpler method, involving of the manual wear of teeth followed by decalcification and observation under a stereomicroscope. This technique has been employed successfully with larger species of Odontoceti. Twenty-six specimens were selected, and one tooth of each specimen was worn and demineralized for growth layers reading. Growth layers were evidenced in all specimens; however, in 4 of the 26 teeth, not all the layers could be clearly observed. In these teeth, there was a significant decrease of growth layer group thickness, thus hindering the layers count. The juxtaposition of layers hindered the reading of larger numbers of layers by the wear and decalcification technique. Analysis of more than 17 layers in a single tooth proved inconclusive. The method applied here proved to be efficient in estimating the age of Sotalia guianensis individuals younger than 18 years. This method could simplify the study of the age structure of the overall population, and allows the use of the more expensive methodologies to be confined to more specific studies of older specimens. It also enables the classification of the calf, young and adult classes, which is important for general population studies.
Assuntos
Determinação da Idade pelos Dentes/métodos , Golfinhos/fisiologia , Dente/anatomia & histologia , Animais , Cemento Dentário/anatomia & histologia , Dentina/anatomia & histologia , FormiatosRESUMO
A two year study of dung beetles and ants acting on scats of two species of opossum (Didelphis spp.) was carried out. Scats were left in the field in order to detect post-dispersal agents. A portion of each scat (30 %) was examined for seeds in the laboratory. Beetles were recovered from burrows (51% of 84 faecal samples left in the field) where they either buried scats of opossums or were attracted, together with ants, to pitfalls (N = 10) baited with opossum scats. Dung beetles were the main post-dispersal agents of seeds found in scats of opossums, rolling the scats away or burying then on the site of deposition. They buried faeces at 4 to 15 cm in depth (N = 22 tunnels). The main dung beetles identified (medium to large size) were Eurysternus (28.7 % in pitfalls) and Dichotomius (13.7 %), Coprophanaeus (seen only directly on faeces), besides small-bodied beetles (< 10 mm; 57.6 %). The ant Acromirmex sp. transported some seeds from scats. This species was present in 25.5 % of all Formicidae samples (pitfall). These post-dispersal agents contribute to avert scat seed predators such as rodents, and to accelerate seed bank formation.
Por dos años estudiamos los escarabajos coprófagos y las hormigas que actúan en las heces de zarigüellas (Didelphis). Se dejaron excrementos en el campo para descubrir los agentes secundarios de dispersión. Una parte de cada excremento (30 %) fue analizada en laboratorio para estimar el número de semillas. Se recolectaron escarabajos del suelo (51 % de 84 excrementos dejados en el campo). También capturamos escarabajos y hormigas con trampas (N= 10). Los escarabajos coprófagos son los principales agentes secundarios de dispersión. Ruedan los excrementos o los entierran a 4-15 cm de profundidad (N= 22 túneles). Los escarabajos coprófagos de mayor tamaño fueron Eurysternus cyanescens (28.7 % en trampas), Dichotomius assifer (13.7 %) y Coprophanaeus saphirinus (sólo visto en madrigueras y directamente sobre los excrementos). Los escarabajos de menos de 10 mm fueron el 57.6 %. La hormiga Acromirmex sp. fue 25.5 % del total de hormigas capturadas en trampas. Hallamos varias especies de semillas en los excrementos, muchos de ellos enterrados por los escarabajos, y algunas fueron extraídas por las hormigas. Estos agentes secundarios ayudan a evitar los depredadores de semillas (eg. roedores) y aceleran la formación del banco de semillas, pues no las comen.
Assuntos
Animais , Besouros/fisiologia , Comportamento Animal/fisiologia , Formigas/fisiologia , Gambás/fisiologia , Sementes/crescimento & desenvolvimento , FezesRESUMO
A two year study of dung beetles and ants acting on scats of two species of opossum (Didelphis spp.) was carried out. Scats were left in the field in order to detect post-dispersal agents. A portion of each scat (30 %) was examined for seeds in the laboratory. Beetles were recovered from burrows (51% of 84 faecal samples left in the field) where they either buried scats of opossums or were attracted, together with ants, to pitfalls (N = 10) baited with opossum scats. Dung beetles were the main post-dispersal agents of seeds found in scats of opossums, rolling the scats away or burying then on the site of deposition. They buried faeces at 4 to 15 cm in depth (N = 22 tunnels). The main dung beetles identified (medium to large size) were Eurysternus (28.7 % in pitfalls) and Dichotomius (13.7 %), Coprophanaeus (seen only directly on faeces), besides small-bodied beetles (< 10 mm; 57.6 %). The ant Acromirmex sp. transported some seeds from scats. This species was present in 25.5 % of all Formicidae samples (pitfall). These post-dispersal agents contribute to avert scat seed predators such as rodents, and to accelerate seed bank formation.
Assuntos
Formigas/fisiologia , Comportamento Animal/fisiologia , Besouros/fisiologia , Gambás/fisiologia , Sementes/crescimento & desenvolvimento , Animais , FezesRESUMO
Foram avaliados os padrões de crescimento para uma população de cutias (Dasyprocta azarae Lichtenstein, 1823) em cativeiro, no Criadouro Científico de Animais Silvestres do Museu de História Natural Capão da Imbuia (Curitiba - Paraná - Brasil). No período entre 1993 e 1997, efetuaram-se 699 medidas de 140 animais, avaliando-se os parâmetros peso (g) e comprimento total (mm). Na comparação da relação entre peso e comprimento total de ninhadas com um, dois, e três filhotes, foram observados diferentes valores para os fatores de condição (K). Os coeficientes angulares variaram de 2,9 a 3,2 (crescimento isométrico).(AU)
Growth patterns were established for one captive population of agouti Dasuprocta azarae Lichtenstein, 1823, in the "Scientific Breeder of Wild Animals from Natural's History Museum Capão da Imbuia" (Curitiba - Paraná - Brazil). In the period between 1993 and 1997, 699 measurements were taken from 140 animals, evaluating the parameters weight (g) and total length (mm). The relation's comparison among weight and total length of broods with singleton, twin and triplet offsprings had different values for the condition factor (K). The angular coefficient varied from 2.9 to 3.2 (isometric growth).(AU)
Se establecieron los modelos de crecimiento para una población cautiva de agutí (Dasyprocta azarae Lichtenstein, 1823) en el "Criadouro Científico de Animais Silvestres - Museu de História Natural Capão da Imbuia" (Curitiba - Paraná - Brasil). En el periodo entre 1993 y 1997 se tomaron 699 medidas de 140 animales, siendo evaluavados los parámetros peso (g) y longitud total (mm). La relación entre peso y longitud total tuvo valores diferentes para el factor de condición (K) en camadas con un, dos o tres crias. El coeficiente angular varió del 2,9 al 3,2 (crecimento isométrico).(AU)
Assuntos
Animais , Crescimento , Mamíferos , Peso-EstaturaRESUMO
Foram avaliados os padrões de crescimento para uma população de cutias (Dasyprocta azarae Lichtenstein, 1823) em cativeiro, no Criadouro Científico de Animais Silvestres do Museu de História Natural Capão da Imbuia (Curitiba - Paraná -Brasil). No período entre 1993 e 1997, efetuaram-se 699 medidas de 140 animais, avaliando-se os parâmetros peso (g) e comprimento total (mm). Na comparação da relação entre peso e comprimento total de ninhadas com um, dois, e três filhotes, foram observados diferentes valores para os fatores de condição (K). Os coeficientes angulares variaram de 2,9 a 3,2 (crescimento isométrico).
Assuntos
Animais , Peso-Estatura , Crescimento , MamíferosRESUMO
A survey of the carrion fauna was made at two sites in Curitiba, State of Parana, with the objective of describing the insects associed with carrion and setting up a preliminary data-base for medico-legal purposes in south Brazil. Vertebrate exclusion experiments were carried out in each season between 1994 and 1995 with a 250 g laboratory-bred rat (rattus norvegicus). Five stages of decomposition were identified: fresh, bloated, decaying, dry and adipocere-like. Some species showed seasonal and site preference and so could be used to identify the probable place and season where death took place. Sarconesia chlorogaster (Diptera, Calliphoridae) was restrited to an open field site and to cooler months. Hemilucilia semidiaphana (Diptera, Calliphoridae) and Pattonella resona (Diptera, Sarcophagidae) were restrited to the forest site and warmer months. Phaenicia eximia (Diptera, Calliphoridae) and Oxyletrum discicolle (Coleoptera, Silphidae) were present at both sites throughout the year and could be useful for population level analysis. Dissochaetus murray (Coleoptera, Cholevidae) was present throughout the year at the forest site and was associated with the adipocere-like stage. Ants played an important role producing post-mortem injuries to the carcasses. Insects of 32 species are reported as being useful in community level approaches.