Several factors may restrict the acquisition of food to below the levels predicted by the optimization theory. However, how the design of structures that animals build for foraging restricts the entry of food is less known. Using scaling relationships, we determined whether the design of the entrances of leaf-cutting ant nests restricts resource input into the colony. We measured nests and foraging parameters in 25 nests of Atta cephalotes in a tropical rain forest. Ant flux was reduced to up to 60% at nest entrances. The width of all entrances per nest increased at similar rates as nest size, but the width of nest entrances increased with the width of its associated trail at rates below those expected by isometry. The fact that entrance widths grow slower than trail widths suggests that the enlargement of entrance holes does not reach the dimensions needed to avoid delays when foraging rates are high and loads are big. The enlargement of nest entrances appears to be restricted by the digging effort required to enlarge nest tunnels and by increments in the risk of inundation, predator/parasitoid attacks and microclimate imbalances inside the nest. The design of the extended phenotypes can also restrict the ingress of food into the organisms, offering additional evidence to better understand eventual controversies between empirical data and the foraging theory. Abstract in Spanish is available with online material. © 2019 The Association for Tropical Biology and Conservation
|Título:||Extended phenotypes and foraging restrictions: ant nest entrances and resource ingress in leaf-cutting ants|
|Autor:||Rodríguez-Planes, L.I.; Farji-Brener, A.G.|
|Filiación:||Facultad de Ciencias Exactas y Naturales, Laboratorio de Eco-Epidemiología y Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina|
Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Ciudad Universitaria, Buenos Aires, Argentina
LIHO (Laboratorio de Investigaciones en Hormigas), INIBIOMA-CONICET, Bariloche, Argentina
|Palabras clave:||Atta cephalotes; Costa Rica; foraging; leaf-cutting ants; tropical rain forest; Animalia; Atta; Atta cephalotes|
|Página de inicio:||178|
|Página de fin:||185|
|Título revista abreviado:||Biotropica|
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---------- APA ----------Rodríguez-Planes, L.I. & Farji-Brener, A.G.
. Extended phenotypes and foraging restrictions: ant nest entrances and resource ingress in leaf-cutting ants. Biotropica, 51(2), 178-185.
---------- CHICAGO ----------Rodríguez-Planes, L.I., Farji-Brener, A.G.
"Extended phenotypes and foraging restrictions: ant nest entrances and resource ingress in leaf-cutting ants"
. Biotropica 51, no. 2
(2019) : 178-185.
---------- MLA ----------Rodríguez-Planes, L.I., Farji-Brener, A.G.
"Extended phenotypes and foraging restrictions: ant nest entrances and resource ingress in leaf-cutting ants"
. Biotropica, vol. 51, no. 2, 2019, pp. 178-185.
---------- VANCOUVER ----------Rodríguez-Planes, L.I., Farji-Brener, A.G. Extended phenotypes and foraging restrictions: ant nest entrances and resource ingress in leaf-cutting ants. Biotropica. 2019;51(2):178-185.