Effects of the gastropod,Ilyanassa obsoleta(Say) and the bivalve,Mercenaria mercenaria (L.), on larval settlement and juvenile recruitment of infauna |
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| Institution: | 1. University Eduardo Mondlane, Department of Biological Sciences, Maputo, Mozambique;2. The University of Iceland’s Research Centre in Suðurnes, Gardvegi 1, 245 Sandgerði, Iceland;3. University of Gothenburg, Department of Biological and Environmental Sciences, Kristineberg 566, SE-45178, Fiskebäckskil, Sweden;1. Zoology Department, University of Otago, PO Box 56, Dunedin 9054, New Zealand;2. Geology Department, University of Otago, PO Box 56, Dunedin 9054, New Zealand;1. Laboratorio de Oceanografía Biológica, Centro para el Estudio de Sistemas Marinos (CCT CONICET – CENPAT), Blvd. Brown 2915, Puerto Madryn, Chubut, U9120ACD, Argentina;2. Instituto Patagónico del Mar, Universidad Nacional de la Patagonia San Juan Bosco, Bvd. Brown 3051, Puerto Madryn, Chubut, U9120ACD, Argentina;3. Conservation Genetics Laboratory & Desert Laboratory on Tumamoc Hill, The University of Arizona, 1064 East Lowell Street, Tucson, AZ 85721, USA;4. @ Lab Applied Genomics, La Paz, Baja California Sur, 23000, Mexico;1. Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi 110007, India;2. Department of Zoology, Ramjas College, University of Delhi, Delhi 110 007, India;3. Department of Zoology, Sri Venkateswara College, University of Delhi South Campus, New Delhi 110 021, India;4. ARSC, Division of Animal Sciences, Room # S128, University of Missouri, Columbia, MO 65211, USA |
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| Abstract: | Densities of a deposit-feeding gastropod, Ilyanassa obsoleta(Say) and a suspension-feeding bivalve, Mercenaria mercenaria (L.), were manipulated to test the importance of interactions between adults and settling larvae in affecting abundance patterns of infaunal invertebrates. Abundance of postlarvae and juveniles was significantly lower in the presence of Ilyanassa obsoleta than in snail-free controls. I. obsoleta caused a reduction in abundance of as much as 45%. Surface-dwelling tubiculous polychaetes, gastropods, harpacticoid copepods, and mobile subsurface-dwelling infauna all declined in abundance with increasing I. obsoleta density. Mercenaria mercenaria had little or no effect upon larval settlement. The effect of Ilyanassa obsoleta and Mercenaria mercenaria combined was equivalent to the sum of the effects of each species separately. Disturbance and ingestion of newly settled larvae by Ilyanassa obsoleta, larval settlement selectivity, and disturbance-induced emigration are probable mechanisms causing differences in abundance between I. obsoleta treatments. |
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