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In many marine species, large females tend to produce more robust offspring than smallfemales. However, knowledge on maternal influences in decapod crustaceans is limited. This isunfortunate since many decapod populations are being intensively harvested and show signs of‘juvenescence’, i.e. the loss of large (and presumably old) individuals. In this study, we quantifiedmaternal influences in European lobster Homarus gammarus from Skagerrak, southern Norway. Historicallobster catches in Skagerrak were substantial but the stock has suffered a major decline overthe past 30 to 40 yr and is currently red listed as near threatened according to the IUCN (InternationalUnion for Conservation of Nature) criteria. We studied eggs and larvae from wild-caught ovigerousfemales ranging in carapace length from 79 to 152 mm (n = 45). Mean egg size increased while siblingsize variation decreased significantly with increasing maternal size. Mean larval size at hatchingwas closely linked to both maternal size and mean egg size. A laboratory experiment showed a weakbut significant nonlinear increase in pelagic larval survival with increasing mean egg size in theabsence of food. These findings suggest that maternal influences on offspring quality could be a significantsource of variation in lobster recruitment. Consequently, maternal influences could be animportant source of error in fisheries science and management if they are assumed to be absent orunimportant.2015-02-1

Maternal influences on offspring size variation and viability in wild European lobster Homarus gammarus