Como a proximidade de atividades agrícolas afeta libélulas? Efeitos sobre traços biológicos de Hetaerina rosea
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Data
2014-02-27
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Universidade Federal de Goiás
Resumo
In our study, we evaluated the proximity of agricultural activities and the
percentage of area with anthropogenic activities affect the development of
Hetaerina rosea. The impacts of human activities may lead to instability of the
development of organisms before they affect population variables.
Understanding how these effects are negative for individuals can be a powerful
metric and assist in decision making regarding the management of impacts. The
most commonly used measure to assess how the developmental instability is
fluctuating asymmetry (AF). Although several studies provide support for using
AF as an indicator of stress during development, others have questioned its
validity as a bioindication tool. Our findings suggest little support to AF.
However, we must consider that development is an integrated process and
other biological traits may be affected during development. Weight is one of
these variables. In our study, we observed that individuals from environments
near to agricultural activities had lower weights. This result can be explained by
the influence of stresses during the larval stage, such as, for example, the
presence of pesticides in streams, increased competition from adult males by
breeding territories or lesser quantity/quality of food availability in streams
nearby to agricultural activities. Although the hypothesis of food stress in the
larval stage or adult stage cannot be considered separately, they may provide
that, in Odonata, the size would be maintained in detriment of weight, since
stresses during the larval stage lead to energy investment in compensatory
growth through increased metabolism. Our results can be interpreted according
to this premise since no significant differences between the average size of the
wings. Thus, we suggest that for a more integrated view of how anthropogenic stresses affect the development of Odonata other variables should be used in
addition to AF, such as weight and size.
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Citação
PINTO, Nelson Silva. Como a proximidade de atividades agrícolas afeta libélulas? Efeitos sobre traços biológicos de Hetaerina rosea. 2014. 48 f. Dissertação (Mestrado em Ecologia e Evolução) - Universidade Federal de Goiás, Goiânia, 2014.