RESUMO
Landscapes are consistently under pressure from human-induced ecological change, often resulting in shifting species distributions. For some species, changing the geographical breadth of their niche space results in matching range shifts to regions other than those in which they are formally found. In this study, we employ a population genomics approach to assess potential conservation issues arising from purported range expansions into the south Texas Brush Country of two sister species of ducks: mottled (Anas fulvigula) and Mexican (Anas diazi) ducks. Specifically, despite being non-migratory, both species are increasingly being recorded outside their formal ranges, with the northeastward and westward expansions of Mexican and mottled ducks, respectively, perhaps resulting in secondary contact today. We assessed genetic ancestry using thousands of autosomal loci across the ranges of both species, as well as sampled Mexican- and mottled-like ducks from across overlapping regions of south Texas. First, we confirm that both species are indeed expanding their ranges, with genetically pure Western Gulf Coast mottled ducks confirmed as far west as La Salle county, Texas, while Mexican ducks recorded across Texas counties near the USA-Mexico border. Importantly, the first confirmed Mexican × mottled duck hybrids were found in between these regions, which likely represents a recently established contact zone that is, on average, ~100 km wide. We posit that climate- and land use-associated changes, including coastal habitat degradation coupled with increases in artificial habitats in the interior regions of Texas, are facilitating these range expansions. Consequently, continued monitoring of this recent contact event can serve to understand species' responses in the Anthropocene, but it can also be used to revise operational survey areas for mottled ducks.
Assuntos
Patos , Hibridização Genética , Animais , Patos/genética , Texas , Humanos , MéxicoRESUMO
The mobility of people around the world is nothing new and brings with it different impacts on interpersonal relationships. In this paper we will reflect on this subject starting from certain questions: what dialogues can be had from those who bring new ideas from their travels with the keepers of traditions in their communities? Is it possible to entertain the image of a pluralistic and globalized world? We begin by tracing the movement of peoples through the centuries, the two major ways in life which developed: nomadism and sedentarism - and how the differences generated conflicts and discrimination. Finally, we reflect on the attributes of the god Hermes from which there is the possibility of creating space to live out our intercultural encounters with reciprocity and generosity within the hospitality ritual of 'giving and receiving'.
La mobilité des personnes dans le monde entier n'a rien de nouveau et amène avec elle différents impacts sur les relations interpersonnelles. Dans cet article nous réfléchirons sur le sujet en partant de certaines questions: quels dialogues peuvent se produire nourris par ceux qui amènent de nouvelles idées de leurs voyages avec ceux qui sont les gardiens des traditions dans leurs communautés? Est-il possible de concevoir l'image d'un monde pluraliste et globalisé? Nous commençons par retracer le mouvement des peuples au travers des siècles, et les deux principales manières de vivre qui se sont développées: le nomadisme et la sédentarité - et comment les différences ont généré des conflits et de la discrimination. Finalement, nous attirons l'attention sur quelques épitaphes du dieu Hermès, qui nous donnent la possibilité de créer de l'espace pour vivre les rencontres interculturelles avec réciprocité et générosité au sein du rituel d'hospitalité: 'donner et recevoir'.
La movilidad de las personas alrededor del mundo no es algo nuevo y trae consigo impactos diferentes en las relaciones interpersonales. En el presente trabajo reflexionamos sobre este tema comenzando con algunas preguntas: ¿Cuáles son los diálogos posibles con quienes brindan nuevas ideas a partir de sus viajes con los cuidadores de la tradición en sus comunidades? ¿Es posible considerar la imagen de un mundo globalizado y plural? Comenzamos por trazar los movimientos de las personas a través de los siglos, los dos modos principales de vida que se han desarrollado: nomadismo y sedentarismo - y cómo las diferencias han generado conflictos y discriminación. Finalmente, ponemos de manifiesto algunos epitafios del dios Hermes, desde lo cual es posible crear espacio para vivir encuentros interculturales con reciprocidad y generosidad al interior del ritual de la hospitalidad del 'dar y recibir'.
A mobilidade de pessoas em todo o mundo não é novidade e traz consigo diferentes impactos nas relações interpessoais. Neste artigo, refletiremos sobre esse assunto a partir de certas perguntas: Quais diálogos podem ser tidos daqueles que trazem novas ideias de suas viagens com os guardiões das tradições em suas comunidades? É possível entreter a imagem de um mundo pluralista e globalizado? Começamos traçando o movimento dos povos ao longo dos séculos, os dois principais modos de vida que se desenvolveram: nomadismo e sedentarismo - e como as diferenças geraram conflitos e discriminação. Finalmente, trazemos à luz alguns epitáfios do deus Hermes, dos quais há a possibilidade de criar espaço para viver os encontros interculturais com reciprocidade e generosidade dentro do ritual de hospitalidade de "dar e receber".