Effects of size and size structure on predation and inter-cohort competition in red-eyed treefrog tadpoles.

Oecologia
Christopher M Asquith, James R Vonesh

Abstract

Individual and relative body size are key determinants of ecological performance, shaping the strength and types of interactions within and among species. Size-dependent performance is particularly important for iteroparous species with overlapping cohorts, determining the ability of new cohorts to invade habitats with older, larger conspecifics. We conducted two mesocosm experiments to examine the role of size and size structure in shaping growth and survival in tadpoles of the red-eyed treefrog (Agalychnis callidryas), a tropical species with a prolonged breeding season. First, we used a response surface design to quantify the competitive effect and response of two tadpole size classes across three competitive environments. Large tadpoles were superior per capita effect competitors, increasing the size difference between cohorts through time at high resource availability. Hatchlings were better per biomass response competitors, and maintained the size difference between cohorts when resource availability was low. However, in contrast to previous studies, small tadpoles never closed the size gap with large tadpoles. Second, we examine the relationship between body size, size structure, and predation by dragonfly nymphs (Anax a...Continue Reading

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Citations

Jan 16, 2015·Diseases of Aquatic Organisms·Shane M HanlonMatthew J Parris
Dec 17, 2015·Ecology and Evolution·Michael W McCoyJames R Vonesh
Jan 21, 2014·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Allyson E Kennedy, Amanda J Dickinson
Dec 15, 2017·Ecology and Evolution·Bradley E Carlson, Tracy Langkilde
Nov 17, 2017·Ecology Letters·Martino E MalerbaDustin J Marshall
Aug 3, 2020·Oecologia·Michael P MooreHoward H Whiteman

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