Feeding habits of the dungeness crab Cancer magister as determined by the index of relative importance

Stevens, Bradley G.; Armstrong, David A.; Cusimano, RF

doi:10.1007/bf00396914

Cited by 130 publications

(101 citation statements)

References 11 publications

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“…We predicted that larger individuals would have enriched d 15 N and d 13 C as they shift diet towards higher trophic levels (Stevens et al 1982). We also predicted shell age (time since last molting) would correlate with an enrichment in heavy isotopes.…”

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confidence: 89%

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From earth and ocean: investigating the importance of cross‐ecosystem resource linkages to a mobile estuarine consumer

Harding

Reynolds

2014

Ecosphere

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Abstract. Externally derived resources often contribute to the structuring of ecological communities.Estuaries are one of the most productive ecosystems in the world and provide an ideal system to test how communities may be shaped by resource subsidies because they occur at the intersection of marine, freshwater and terrestrial habitats. Here we tested the effects of both terrestrial-and salmon-derived subsidies, in addition to other factors such as habitat area, on the diet (inferred from stable isotopes), abundance and size of a mobile estuarine consumer, the Dungeness crab (Metacarcinus magister). Crab trap surveys encompassed 19 watersheds over two seasons in the central coast of British Columbia, Canada, which spanned natural gradients in estuary size, watershed size, riparian tree composition, and Pacific salmon spawning density. Stable isotope ratios of crab tissue confirmed the predictions that estuarine nutrient regimes can be strongly affected by upstream watershed size, salmon density, and the dominance of nitrogen-fixing red alder (Alnus rubra). There were more crabs in larger estuaries and the largest crabs were found in estuaries below the largest watersheds. The proportional contributions of terrestrial-and salmon-derived subsidies to the diet of Dungeness crabs increased with watershed size and salmon density, respectively. These results confirmed that resource subsidies can constitute large proportions of the Dungeness crab's diet, that crab abundance is determined by habitat size, but that crab size is affected by the magnitude of terrestrial resource influx.

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confidence: 89%

“…Although Dungeness crabs moult throughout their lives, this frequency decreases with age (Wainwright and Armstrong 1993). Therefore older shells could indicate older individuals, which may feed at higher trophic levels (Stevens et al 1982).…”

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confidence: 99%

From earth and ocean: investigating the importance of cross‐ecosystem resource linkages to a mobile estuarine consumer

Harding

Reynolds

2014

Ecosphere

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“…The shredding of prey by mouthparts and further mastication by the gastric mill makes identification of prey species difficult (Stevens et al, 1982). However, a study of the food habits of the crab is of considerable importance because food availability and utilization may play important roles in the distribution, migration and moulting patterns of the crabs.…”

Section: Introductionmentioning

confidence: 99%

Feeding habits of the false southern king crab <i>Paralomis granulosa</i> (Lithodidae) in the Beagle Channel, Tierra del Fuego, Argentina

Comoglio¹,

Amin²

1999

Sci. Mar.

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“…Elner (1978) e Seed (1980) relatam a versatilidade dos braquiúros em capturar suas presas que vivem associadas aos mexilhões. Elner & Lavoie (1983) verificam o mesmo nos cultivos de ostras, Stevens et al (1982) de outros moluscos e Kneib (1982) de peixes.…”

Section: Discussionunclassified

Crustáceos decápodos associados às cordas de cultivo do mexilhão Perna perna (Linnaeus, 1758) (Mollusca, Bivalvia, Mytilidae) na Enseada da Armação do Itapocoroy, Penha - SC

2012

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Este estudo teve por objetivo descrever a assembleia de crustáceos decápodos associados às cordas de cultivo de mexilhões em uma fazenda marinha localizada na Enseada da Armação do Itapocoroy, no Município de Penha, Santa Catarina, sul do Brasil. Os seguintes aspectos foram tratados: composição de espécies e peso total, sucessão de espécies e oscilação temporal da abundância, riqueza de espécies e diversidade (Shannon). O crescimento do mexilhão em (altura da concha e peso dos indivíduos) também, foram apresentados. Os decápodos foram amostrados de 15 cordas amostradas bimensalmente (três cordas a cada dois meses). Um total de 501 decápodos foram capturados, pertencentes a nove famílias, 15 gêneros e 21 espécies. A família dominante foi Porcellanidae, com sete espécies, seguida de Panopeidae (cinco) e de Pilumnidae (três), enquanto as demais foram representadas por uma espécie. A espécie mais abundante foi Pilumnus dasypodus (n = 244) que, junto com Synalpheus fritzmuelleri, Pachycheles laevidactylus, Pisidia brasiliensis, Menippe nodifrons, Pachycheles monilifer e Petrolisthes galathinus, somou 88% das ocorrências. A riqueza de espécies aumentou de três para 15 durante o experimento e a diversidade de espécies mostrou seu máximo no quinto mês seguido pelo nono, devido ao aumento da disponibilidade de refúgios no interior do substrato biológico composto por mexilhões vivos. O peso total dos decápodos representou apenas 3% do peso total das cordas de cultivo, devido ao seu tamanho reduzido. Isto indica que estes animais não podem ser considerados prejudiciais para o cultivou mexilhões. As cordas desempenham o papel de fornecer abrigo e fonte de alimento, já que a maioria destes decápodos passa todo o período bentônico do seu ciclo de vida neste biótopo.

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Feeding habits of the dungeness crab Cancer magister as determined by the index of relative importance

Cited by 130 publications

References 11 publications

From earth and ocean: investigating the importance of cross‐ecosystem resource linkages to a mobile estuarine consumer

From earth and ocean: investigating the importance of cross‐ecosystem resource linkages to a mobile estuarine consumer

Feeding habits of the false southern king crab <i>Paralomis granulosa</i> (Lithodidae) in the Beagle Channel, Tierra del Fuego, Argentina

Crustáceos decápodos associados às cordas de cultivo do mexilhão Perna perna (Linnaeus, 1758) (Mollusca, Bivalvia, Mytilidae) na Enseada da Armação do Itapocoroy, Penha - SC

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