Opposite latitudinal patterns for bird and arthropod predation revealed in experiments with differently colored artificial prey

25 de novembro de 2019

nov 25, 2019

Elena L. Zvereva, Bastien Castagneyrol, Tatiana Cornelissen, Anders Forsman, Juan Antonio Hernández‐Agüero, Tero Klemola, Lucas Paolucci, Vicente Polo, Norma Salinas, Kasselman Jurie Theron, Guorui Xu, Vitali Zverev, Mikhail V. Kozlov

The strength of biotic interactions is generally thought to increase toward the equator, but support for this hypothesis is contradictory. We explored whether predator attacks on artificial prey of eight different colors vary among climates and whether this variation affects the detection of latitudinal patterns in predation.

Bird attack rates negatively correlated with model luminance in cold and temperate environments, but not in tropical environments. Bird predation on black and on white (extremes in luminance) models demonstrated different latitudinal patterns, presumably due to differences in prey conspicuousness between habitats with different light regimes. When attacks on models of all colors were combined, arthropod predation decreased, whereas bird predation increased with increasing latitude.

We conclude that selection for prey coloration may vary geographically and according to predator identity, and that the importance of different predators may show contrasting patterns, thus weakening the overall latitudinal trend in top‐down control of herbivorous insects.

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A Amazônia em Clima de Mudança: Reduzindo as emissões de Carbono resultantes de desmatamento e degradação florestal em grande escala

A Amazônia em Clima de Mudança: Reduzindo as emissões de Carbono resultantes de desmatamento e degradação florestal em grande escala

Este relatório é um projeto conjunto do Instituto de Pesquisa Ambiental da Amazônia (IPAM), Woods Hole Research Center (WHRC) e da Universidade Federal de Minas Gerais (UFMG), cujo tema norteador é "o potencial de redução de emissão de gases de efeito estufa proveniente do desmatamento da Floresta Amazônica".