TY - JOUR
T1 - Measuring life-history omnivory in the opossum shrimp, Mysis relicta, with stable nitrogen isotopes
AU - Branstrator, Dann K.
AU - Cabana, Gilbert
AU - Mazumder, Asit
AU - Rasmussen, Joseph B.
PY - 2000/3
Y1 - 2000/3
N2 - Mysis relicta is a species of omnivorous zooplankton that has been implicated over the last several decades in important food-web processes such as the lengthening of food chains, the mobilization of benthic contaminants to the pelagic, and the restructuring of community dynamics. We used stable nitrogen isotopes (δ15N) to quantify ontogenetic diet shifting of M. relicta in five North American lakes. Analyses indicated that M. relicta measuring > 1.5 cm were elevated, on average, 0.73 trophic levels above conspecifics measuring <1-cm length, and 0.57 trophic levels above conspecifics measuring >1 but <1.5-cm length. This pattern suggests a trend toward increasing carnivory with maturity, which is consistent with the results of previous conventional approaches to diet analysis in this species. Our results should be useful to modelers concerned with quantifying the effects of M. relicta on energy transfer and contaminant bioaccumulation in food chains.
AB - Mysis relicta is a species of omnivorous zooplankton that has been implicated over the last several decades in important food-web processes such as the lengthening of food chains, the mobilization of benthic contaminants to the pelagic, and the restructuring of community dynamics. We used stable nitrogen isotopes (δ15N) to quantify ontogenetic diet shifting of M. relicta in five North American lakes. Analyses indicated that M. relicta measuring > 1.5 cm were elevated, on average, 0.73 trophic levels above conspecifics measuring <1-cm length, and 0.57 trophic levels above conspecifics measuring >1 but <1.5-cm length. This pattern suggests a trend toward increasing carnivory with maturity, which is consistent with the results of previous conventional approaches to diet analysis in this species. Our results should be useful to modelers concerned with quantifying the effects of M. relicta on energy transfer and contaminant bioaccumulation in food chains.
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U2 - 10.4319/lo.2000.45.2.0463
DO - 10.4319/lo.2000.45.2.0463
M3 - Article
AN - SCOPUS:0034013984
SN - 0024-3590
VL - 45
SP - 463
EP - 467
JO - Limnology and Oceanography
JF - Limnology and Oceanography
IS - 2
ER -