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Predator-prey system structure in patchy and ephemeral phytotelmata: Aquatic communities in small aroid axils

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Researches on Population Ecology

Abstract

Mechanisms allowing the persistence of an aquatic predator-prey system in tiny pools (the mean ca. 0.5 ml) held by taro axils were analyzed from the viewpoint of temporal and spatial patterns of habitat use. Predatory larvae of a mosquitoTopomyia tipuliformis concentrated in young axils, while 9 other taxa utilized both young and old axils or concentrated more in older axils. The total prey density was lower in axils with the predator but the density of each prey taxon (except for a few cases) and the number of prey taxa did not differ between axils with and without predators. This indicates thatT. tipuliformis is a general predator and does not influence prey community organization through selective removal of particular prey taxa. Inter-axil distribution ofT. tipuliformis was aggregated in the first instar but uniform in the third and fourth instars due to intraspecific cannibalism, which assures the survival of a single individual under short food supply. Distributions of prey taxa were mostly aggregated, fitting the negative binomial distribution. Thirty seven out of 45 associations of 10 taxa were independent with 3 negative (between the predator and some late-colonizing prey) and 5 positive (between some prey taxa) associations. Probabilistic refuges (produced by independent aggregated distributions) reduced interspecific encounters which may result in competition and predation, and thus probably facilitated prey coexistence. There was no evidence for the importance of predation in structuring the prey community. This system may be prey-dominated in that predator persistence depends on prey community existence but prey community structure depends less on predation.

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Authors and Affiliations

  1. Division of Parasitology, Department of Microbiology, Saga Medical School, Nabeshima 5-1-1, 849, Saga, Japan

    M. Mogi

  2. Department of Crop Pests and Diseases, Faculty of Agriculture, University of Sam Ratulangi, Bahu, 95115, Manado, Indonesia

    D. T. Sembel

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  1. M. Mogi
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  2. D. T. Sembel
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Mogi, M., Sembel, D.T. Predator-prey system structure in patchy and ephemeral phytotelmata: Aquatic communities in small aroid axils. Res Popul Ecol 38, 95–103 (1996). https://doi.org/10.1007/BF02514975

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  • DOI: https://doi.org/10.1007/BF02514975

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