نتایج جستجو برای: trophic states
تعداد نتایج: 465825 فیلتر نتایج به سال:
Fish assemblages in tropical river food webs are characterized by high taxonomic diversity, diverse foraging modes, omnivory, and an abundance of detritivores. Feeding links are complex and modified by hydrologic seasonality and system productivity. These properties make it difficult to generalize about feeding relationships and to identify dominant linkages of energy flow. We analyzed the stab...
BACKGROUND Divergence in trophic niche between the sexes may function to reduce competition between the sexes ("intersexual niche partitioning hypothesis"), or may be result from differential selection among the sexes on maximizing reproductive output ("sexual selection hypothesis"). The latter may lead to higher energy demands in females driven by fecundity selection, while males invest in mat...
We developed mathematical models that simulate community dynamics derived from a series of perturbation 13 experiments. These experiments were performed in an Atlantic Forest stream. The three trophic level community 14 was submitted to two combinations of press perturbation experiment. In the first, the top trophic level was 15 removed by electrical exclusion. In the second configuration, the ...
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Pneumocystis organisms are airborne opportunistic pathogens that cannot be continuously grown in culture. Consequently, the follow-up of Pneumocystis stage-to-stage differentiation, the sequence of their multiplication processes as well as formal identification of the transmitted form have remained elusive. The successful high-speed cell sorting of trophic and cystic forms is paving the way for...
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