Initial juvenile size and environmental severity: influence of predation and wave exposure on hatching size in Nucella ostrina

Initial juvenile size and environmental severity: influence of predation and wave exposure on hatching size in Nucella ostrina

According to life history theory, offspring survival increases with offspring size, mainly because large offspring are more resistant to environmental stress. Populations and species living in habitats with severe environmental conditions have therefore been predicted to produce larger offspring tha...

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Veröffentlicht in:Marine ecology. Progress series (Halstenbek) 2007-06, Vol.339, p.143-155
Hauptverfasser: Gosselin, LA, Rehak, R
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Gastropoda
Marine
Nucella ostrina
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Rehak, R
description According to life history theory, offspring survival increases with offspring size, mainly because large offspring are more resistant to environmental stress. Populations and species living in habitats with severe environmental conditions have therefore been predicted to produce larger offspring than populations in more benign environments. We studied 10 populations of the rocky intertidal gastropod Nucella ostrina in Barkley Sound, Canada, to determine the extent of variation in average hatching size at a small spatial scale (the sites being
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The relative differences among populations were broadly consistent over the 3 years of the study, some populations consistently producing larger average hatching sizes than other populations. Based on the abundance and size structure of the predator populations at 4 of these field sites, predation pressure was predicted to favour different average N. ostrina hatching sizes at these sites: large at 2 sites and small at 2 sites. However, the average hatching size of N. ostrina populations at those sites was not consistent with that prediction, suggesting predation pressure may not have been an important determinant of hatching size. This is a surprising finding, as predation is often considered to be a major cause of early juvenile mortality and thus an important selective pressure influencing the evolution of early juvenile traits. 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subjects Gastropoda
Marine
Nucella ostrina
title Initial juvenile size and environmental severity: influence of predation and wave exposure on hatching size in Nucella ostrina
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