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Cichlid Fish Diversity Threatened by Eutrophication That Curbs Sexual Selection
Cichlid fish species of Lake Victoria can interbreed without loss of fertility but are sexually isolated by mate choice, and human activities that increase turbidity destroy both the mechanism of diversification and that which maintains diversity. Expand
Information acquisition and time allocation in insect parasitoids
Functional models help explain how parasitoids can allocate foraging time to patches in an adaptive way and that members of the same species can respond differently to the same environmental cues, depending on their physiological state and previous experiences or on genetic differences. Expand
Adaptive superparasitism and patch time allocation in solitary parasitoids: an ESS model.
1. The adaptive value of superparasitism (oviposition in a previously parasitized host) when solitary parasitoids deplete a patch simultaneously is investigated, using a deterministic gameExpand
Evolution of colour patterns in East African cichlid fish
It is suggested that habitat‐mediated selection upon chromomotor flexibility, a special form of phenotypic plasticity found in the river‐dwelling outgroups of the lake‐d Dwelling cichlids, explains the rapid and recurrent ecology‐associated radiation of stripe patterns in lake environments, a new hypothesis that yields experimentally testable predictions. Expand
Species diversity in a mycophagous insect community : the case of spatial aggregation vs. resource partitioning
This conclusion remains unchanged for the mycophagous community as a whole: intra-specific aggregation of competitors is a sufficient and necessary mechanism for co-existence in this diverse community, while resource partitioning does not contribute detectably to species diversity. Expand
Adaptive Superparasitism and Patch Time Allocation in Solitary Parasitoids: the Influence of the Number of Parasitoids Depleting a Patch
An ESS model that predicts more superparasitism and longer patch times with an increasing number of searching parasitoids in a patch, was tested in experiments with Leptopilina heterotoma, a solitaryExpand
Nuclear markers reveal unexpected genetic variation and a Congolese-Nilotic origin of the Lake Victoria cichlid species flock
The results of a phylogenetic investigation using nuclear (amplified fragment length polymorphism) markers and a wider coverage of riverine haplochromines demonstrate that the Lake Victoria–Edward flock is derived from the morphologically and ecologically diverse cichlid genus Thoracochromis from the Congo and Nile, rather than from the phenotypically conservative East African Astatotilapia. Expand
A count-down mechanism for host search in the parasitoid Venturia canescens
Re-examination of Waage's experiments shows that his results do not unambiguously support the existence of the decision mechanism for patch exploitation in Venturia canescens, and formulates a post-hoc 'count-down' model for the decision rule for patch leaving in V.Canescens in habitats with uniform host distributions. Expand
A field study of size–fitness relationships in the parasitoid Asobara tabida
The majority of females appeared to be time-limited, and the increase in fitness with size is predominantly due to a larger dispersal ability and not to a higher egg load. Expand