Functional differences in the allometry of the water, carbon and nitrogen content of gelatinous organisms

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Functional differences in the allometry of the water, carbon and nitrogen content of gelatinous organisms

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dc.contributor.author Molina-Ramirez, A.
dc.contributor.author Caceres, C.
dc.contributor.author Romero-Romero, S.
dc.contributor.author Bueno, J.
dc.contributor.author González-Gordillo, J.I.
dc.contributor.author Irigoien, X.
dc.contributor.author Sostres, J.
dc.contributor.author Bode, A.
dc.contributor.author Mompean, C.
dc.contributor.author Puelles, M.F.
dc.contributor.author Echevarria-Navas, Fidel
dc.contributor.author Duarte, C.M.
dc.contributor.author Acuña, J.L.
dc.contributor.other Biología en_US
dc.date.accessioned 2017-09-21T07:18:25Z
dc.date.available 2017-09-21T07:18:25Z
dc.date.issued 2015-09
dc.identifier.uri http://hdl.handle.net/10498/19688
dc.description.abstract We have supplemented available, concurrent measurements of fresh weight (W, g) and body carbon (C, g) (46 individuals, 14 species) and nitrogen (N, g) (11 individuals, 9 species) of marine gelatinous animals with data obtained during the global ocean MALASPINA 2010 Expedition (totalling 267 individuals and 33 species for the W versus C data; totalling 232 individuals and 31 species for the N versus C data). We then used those data to test the allometric properties of the W versus C and N versus C relationships. Overall, gelatinous organisms contain 1.13 ± 1.57% of C (by weight, mean ± SD) in their bodies and show a C:N of 4.56 ± 2.46, respectively, although estimations can be improved by using separate conversion coefficients for the carnivores and the filter feeders. Reduced major axis regression indicates that W increases isometrically with C in the carnivores (cnidarians and ctenophores), implying that their water content can be described by a single conversion coefficient of 173.78 gW(g C)−1, or a C content of 1.17 ± 1.90% by weight, although there is much variability due to the existence of carbon-dense species. In contrast, W increases more rapidly than C in the filter feeders (salps and doliolids), according to a power relationship W = 446.68C1.54. This exponent is not significantly different from 1.2, which is consistent with the idea that the watery bodies of gelatinous animals represent an evolutionary response towards increasing food capture surfaces, i.e. a bottom-up rather than a top-down mechanism. Thus, the available evidence negates a bottom-up mechanism in the carnivores, but supports it in the filter feeders. Last, N increases isometrically with C in both carnivores and filter feeders with C:N ratios of 3.89 ± 1.34 and 4.38 ± 1.21, respectively. These values are similar to those of compact, non-gelatinous organisms and reflect a predominantly herbivorous diet in the filter feeders, which is confirmed by a difference of one trophic level between filter feeders and carnivores, according to stable N isotope enrichment data. en_US
dc.format application/pdf en_US
dc.language.iso eng en_US
dc.rights info:eu-repo/semantics/openAccess
dc.source Journal of Plankton Research: 1-12 (2015) en_US
dc.subject gelatinous organisms en_US
dc.subject allometry en_US
dc.subject carbon content en_US
dc.subject water content en_US
dc.subject body weight en_US
dc.title Functional differences in the allometry of the water, carbon and nitrogen content of gelatinous organisms en_US
dc.type info:eu-repo/semantics/article en_US
dc.identifier.url https://doi.org/10.1093/plankt/fbv037
dc.rights.accessRights info:eu-repo/semantics/openAccess en_US
dc.identifier.doi 10.1093/plankt/fbv037

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