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Helpful habitant or pernicious passenger: interactions between an infaunal bivalve, an epifaunal hydroid and three potential predators

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Abstract

The importance of positive interspecific interactions within physically stressful habitats has received increased attention from community ecologists. The exposed sandy beach is an example of a physically rigorous environment where biological interactions have long been considered insignificant. We examined the interaction between the infaunal clam, Donax variabilis, and the hydroid, Lovenella gracilis, on exposed sandy beaches in North Carolina. Epibiotic occupation of Donax by hydroids has been repeatedly observed on ocean beaches but rarely investigated. By providing a stable substrate for attachment, the clam facilitates the persistence of the hydroid in the intertidal beach; however, benefits or costs experienced by the host as a result of this association are unknown. By exposing clams with and without hydroid colonies to multiple types of clam predators, we tested the effectiveness of the hydroid, which possesses stinging nematocysts, in defending its host. The hydroid defended the clam against one common predator, the Florida pompano (Trachinotus carolinus). Against speckled crabs (Arenaeus cribrarius) and ghost crabs (Ocypode quadrata), however, the hydroid offered no protection for its host and instead facilitated predation. The epibiotic hydroid, which projects above the surface of the sand, allowed the crabs to more readily detect clams below the surface. In the field, we evaluated the effect of the hydroid on the tidally synchronized migrations and burrowing speed of the clam. The hydroid, which can form large colonies on the posterior end of the clam, had no effect on Donax burrowing speed, but did reduce the speed of transport of clams by wave swash. Depending on relative predation pressure, the occupation of D. variabilis by L. gracilis can alternately be characterized as beneficial or detrimental to the host.

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Acknowledgements

Financial support for this work came from NSF Biological Oceanography grant no. OCE-0002723 to N.L. and from the North Carolina Fisheries Resource Grant Program, North Carolina Sea Grant and the North Carolina Division of Coastal Management. We gratefully thank J. A. Peterson and L. Weiss for help with collection of New Jersey clams and C. Tallent and J. Grabowski for help with collection of fish and crabs. We also thank C.H. Peterson and two anonymous reviewers for providing comments that improved the manuscript.

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Correspondence to Lisa M. Manning.

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Manning, L.M., Lindquist, N. Helpful habitant or pernicious passenger: interactions between an infaunal bivalve, an epifaunal hydroid and three potential predators. Oecologia 134, 415–422 (2003). https://doi.org/10.1007/s00442-002-1134-y

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