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首页> 外文期刊>Marine ecology >Combined stomach content and δ13C/δ15N analyses of oilfish, escolar, snake mackerel and lancetfish in the western North Atlantic
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Combined stomach content and δ13C/δ15N analyses of oilfish, escolar, snake mackerel and lancetfish in the western North Atlantic

机译：北大西洋西部油鱼，e鱼，鲭鱼和刺鱼的胃含量和δ13C/δ15N结合分析

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Large, mesopelagic teleost fishes have a potentially keystone position in the ecology of the pelagic water column, yet remain relatively unstudied when compared with large, commercially important, epipelagic fishes. Here, the ecological roles of four, large, vertically migrating teleosts were examined. Stomach content analyses were performed on 48 oilfish (Ruvettus pretiosis), 35 escolar (Lepidocybium flavobrunneum), 32 snake mackerel (Gempylus serpens) and seven lancetfish (Alepisaurus spp.) collected from pelagic longline gear in the Western North Atlantic Ocean from 2007 to 2010. Of these specimens, stable carbon and nitrogen isotope analyses were also performed on white dorsal muscle tissue from 33 oilfish, 16 escolar, 27 snake mackerel and seven lancetfish. Based on literature length-at-maturity values, all escolar, snake mackerel and lancetfish specimens were mature, while 13 of the 33 oilfish were juveniles. Crustaceans, annelids, salps, cephalopods and teleosts were present in the stomachs and were presumed to be prey items. A Kruskal–Wallis test showed the four species to be isotopically segregated in both δ13C and δ15N. Escolar were the most depleted in δ13C, followed by adult oilfish, juvenile oilfish and lancetfish, with snake mackerel the most enriched. The depletion in δ13C of adult oilfish and escolar may have been attributable to high C/N values, which were strongly correlated with length in oilfish, weakly correlated with length in escolar and moderately correlated with length in snake mackerel and lancetfish. The high C/N was likely due to the high lipid concentration of these fishes. Other factors that may have contributed to the depletion in δ13C may include spawning or a change in carbon source within the ecosystem. Large escolar occupied the highest trophic level (δ15N=10.20), followed by snake mackerel (δ15N=9.66), adult oilfish (δ15N=9.32), lancetfish (δ15N=9.05) and juvenile oilfish (δ15N=7.83). A marked change in oilfish δ13C and C/N at 30–35cm fork length coincided with a presumed length-at-maturity.
机译：大型，近中生硬骨鱼类在中上层水域的生态中具有潜在的关键地位，但与商业上重要的大型上层鱼类相比，仍处于相对未被研究的状态。在这里，研究了四个大型，垂直迁移的硬骨鱼的生态作用。从2007年至2010年从北大西洋西部上层延绳钓渔具中收集的48条油鱼（Ruvettus pretiosis），35条e鱼（Lepidocybium flavobrunneum），32条鲭鱼（Gempylus serpens）和7条鱼（Alepisaurus spp。）进行了胃含量分析在这些标本中，还对33条油鱼，16条e鱼，27条鲭鱼和7条鱼的白色背肌组织进行了稳定的碳和氮同位素分析。根据文献的成熟时长度值，所有e鱼，鲭鱼和柳叶鱼标本均已成熟，而33只油鱼中有13只为幼鱼。甲壳类动物，肘节动物，小牛，头足类动物和硬骨动物存在于胃中，被认为是猎物。 Kruskal–Wallis试验表明，这四个物种在δ13C和δ15N中都处于同位素隔离状态。 Escolar的δ13C消耗最严重，其次是成年油鱼，少年油鱼和柳叶鱼，而鲭鱼则最富。成年油鱼和e鱼的δ13C损耗可能是由于高的C / N值引起的，C / N值与油鱼的长度密切相关，与sco鱼的长度弱相关，而在鲭鱼和鱼的长度中中等相关。较高的C / N可能是由于这些鱼类的脂质含量高所致。可能导致δ13C耗竭的其他因素可能包括生态系统内的产卵或碳源变化。大型石锅鱼的营养水平最高（δ15N= 10.20），其次是鲭鱼（δ15N= 9.66），成年oil鱼（δ15N= 9.32），柳叶鱼（δ15N= 9.05）和幼鱼（δ15N= 7.83）。在叉形长度为30-35cm时，油鱼的δ13C和C / N发生了显着变化，这与假定的成熟长度相吻合。

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