Geographic mosaic of mutually exclusive dominance of obligate commensals in symbiotic communities associated with a burrowing echiuran worm |
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Authors: | Ryutaro Goto Makoto Kato |
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Institution: | (1) Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cho Sakyo, Kyoto 606-8501, Japan |
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Abstract: | Species richness and community composition of symbionts associated with the burrowing echiuran worm, Ochetostoma erythrogrammon Leuckart & Rüppell, 1828, were quantitatively surveyed on subtropical intertidal flats in the Ryukyu Archipelago, Japan. Overall, we recorded seven
species of burrow associates, including at least six obligate commensals. According to symbiont community composition, the
study sites were largely divided into two groups; one was characterized by the dominance of a snapping shrimp, Alpheus barbatus Coutière, 1897, and the other by the dominance of a scale worm, Lepidonotus sp. Furthermore, a granulometric analysis showed that the sediment characteristics differed significantly between shrimp-
and scale worm-dominant sites in terms of median diameter and inclusive graphic standard deviation. These results suggest
that these symbionts have different habitat requirements, resulting in the mutually exclusive dominance pattern. Our findings
indicate that habitat heterogeneity is important to the evaluation and conservation of the symbiotic diversity in intertidal
flats. |
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Keywords: | |
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