A polymorphism maintained by opposite patterns of parasitism and predation

Article Abstract:

Old rats have deficient spatial memory which may mean that the quality and stability of their hippocampal cognitive maps is altered. The hippocampal spatial code was observed to be multistable in recordings from large groups of neurons. In old rates place field maps often showed complete rearrangements between episodes in a familiar environment. The spatial memory performance of old rates remained markedly bimodal. This offers an insight into the dynamics of neural coding and may explain why elderly humans undergo frequent failure of place recognition.

Spatial behavior, Human spatial behavior, Hippocampus (Brain), Geographical perception

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Phylogenetic constraints and adaptation explain food-web structure

Article Abstract:

The proposed new model is built on the hypothesis that any species' diet is the consequence of phylogenetic constraints and adaptation. Simple rules incorporating the concept of adequately recent and high quality data yields food webs whose structure is close to real data.

Science & research, Influence, Food chains (Ecology), Food chains, Adaptability (Psychology)

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