Respostas funcionais ao ambiente não são explicados por filogenia em aves e mamíferos no continente americano
Nenhuma Miniatura disponível
Data
2019-05-29
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
Over the years, ecologists have tried to understand the diversity of attributes in communities
and how this reflects how species respond to the environmental gradient. It is known that
different environmental conditions such as temperature, precipitation and productivity are
able to select attributes and result in different configurations of functional diversity patterns.
These gradient responses may or may not be structured in phylogeny, which argues that
phylogenetically closest lines will respond in a similar manner. Moreover, given the different
histories and evolutionary origins, lineages (e.g. families) may respond differently when
compared to whole groups (e.g. orders). Thus, we aimed to understand if climatic variables
and productivity gradient are able to explain the diversity of attributes of groups and families
of birds and mammals in the American continent. In addition, we wanted to understand if
these responses to environmental gradients had a phylogenetic signal. For this, we calculated
the functional diversity for the group and bird and mammal and their families in Protected
Areas of the American continent, and performed a multiple regression analysis between the
values of diversity and variables of temperature, precipitation, seasonality and productivity
gradient (for the classes and their respective families). Afterwards, we performed a variation
partitioning analysis to understand the contribution of each variable to the values of functional
diversity. We then performed a phylogenetic signal analysis on the slope values (beta)
resulted from multiple regression analyzes. We found that productivity explained most of the
values of functional diversity for the families of birds and mammals. In addition, the
responses to the environmental gradient were quite different for the families when compared
to the group as a whole. We also did not find a phylogenetic signal in the response of bird and
mammal’s families. These results lead us to conclude that studying whole groups rather than
finer taxonomic scales can mask different responses to ecological and evolutionary factors of
community structuring, once lineages have different evolutionary histories and
respond differently to environmental factors. Furthermore, our results show that lineages
with similar environmental gradient responses are not necessarily related (evolutionary
convergence) and, therefore, there is no evidence for niche conservation.
Descrição
Palavras-chave
Citação
WERNECK, R. P. Respostas funcionais ao ambiente não são explicados por filogenia em aves e mamíferos no continente americano. 2019. 64 f. Dissertação (Mestrado em Ecologia e Evolução) - Universidade Federal de Goiás, Goiânia, 2019.