A review of some physiological and evolutionary aspects of body size and bud size of Hydra |
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Authors: | Slobodkin L. B. Bossert Patricia Matessi Carlo Gatto Marino |
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Affiliation: | (1) Department of Ecology and Evolution, State University of New York at Stony Brook, 11794 Stony Brook, NY, USA;(2) Istituto di Genetica ed Evolutionistica, CNR, Via Abbiatagrosso, 207-27100 Pavia, Italy;(3) Dipartimento di Elletronica, Politecnico di Milano, Via Ponzio 34/5, Milano, Italy |
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Abstract: | Green hydra with endosymbionts are smaller than brown asymbiotic ones. Regeneration experiments, mitotic index studies on algal and hydra tissue, and evidence for consumption and expulsion of algae are reviewed and it is suggested that larger green hydra have more difficulty controlling algal increase than smaller ones and that hydra have an upper size limit for maintenance of stable symbioses. A mathematical model is discussed which starts with simple physiological assumptions about hydra and generates field testable conclusions about how body and bud size, and reproductive rates depend on food particle size, quantity and temporal distribution. Unlike most analytic ecological-evolutionary models, this one integrates physiology, ecology and evolution without needing simplifying assumptions. |
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Keywords: | Hydra size endosymbiosis model evolution constraints |
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