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首页> 外文期刊>Limnologica >Feeding of European cisco (Coregonus albula and C-lucinensis) on the glacial relict crustacean Mysis relicta in Lake Breiter Luzin (Germany)
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Feeding of European cisco (Coregonus albula and C-lucinensis) on the glacial relict crustacean Mysis relicta in Lake Breiter Luzin (Germany)

机译:在Breiter鲁津湖(德国)的冰期甲壳类甲壳动物Mysis遗迹上饲喂欧洲粘皮(Coregonus albula和C-lucinensis)

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摘要

Lake Breiter Luzin, located in north-eastern Germany, is known for the rare occurrence of sympatric populations of European cisco, Coregonus albula and C. lucinensis. Moreover, the lake is inhabited by the glacial relict crustacean Mysis relicta, currently found in only three other lakes in Germany. In the present study, the role of M. relicta in the diet of ciscoes was investigated. Between 2001 and 2002 ciscoes, mysids and zooplankton were caught in Lake Breiter Luzin and stomach contents of ciscoes were analysed. There were seasonal changes in the food items in the stomachs, largely reflecting changes in prey availability. The main food items were copepods (45-81%) and mysids (5-26%). Cladocerans had high amounts in the diet only in summer. Seasonal changes in selectivity were also noted for most prey groups. There were also some consistent patterns of prey preference, with an overall preference for mysids. In general, the prey composition in cisco stomachs did not show significant diet changes, but there were some significant differences between day and night feeding in single prey groups, such as cladocerans. Diet composition of ciscoes varied with the different depth strata in which the fish were caught. With increasing depth, the proportion of mysids in the diet significantly increased, whereas that of copepods significantly decreased. Between C. albula and C. lucinensis, no distinct differences in feeding were evident. Mysids provided an additional and important food resource to ciscoes, and were mainly consumed when the availability of other prey organisms decreased, as in autumn and in the deeper strata of the water column. However, mysids preyed on the same food organisms as ciscoes, indicating a strong competition for food between fish and mysids.
机译:位于德国东北部的Breiter Luzin湖以欧洲的科斯科,Coregonus albula和C. lucinensis的同胞同居而闻名。此外,该湖居住着冰川遗骸甲壳类动物Mysis relicta,目前仅在德国的其他三个湖泊中发现过。在本研究中,研究了残渣分支杆菌在黏性饮食中的作用。在2001年至2002年之间,在Breiter Luzin湖中捕获了粘胶,类腮腺和浮游动物,并对粘胶的胃液含量进行了分析。胃中的食物有季节性变化,主要反映了猎物供应的变化。主要食物是co足类动物(45-81%)和类腮腺炎(5-26%)。枝角类仅在夏季饮食中含量高。大多数猎物组的选择性也有季节性变化。还存在一些一致的猎物偏好模式,总体上偏爱mysids。通常,思科胃中的猎物组成没有显示出明显的饮食变化,但是在单个猎物组中,例如锁骨,白天和晚上的进食之间存在一些显着差异。粘滞饲料的组成随捕获鱼的深度不同而不同。随着深度的增加,膳食中的类胡萝卜素比例显着增加,而co足类的比例显着降低。在C. albula和C. lucinensis之间,饲喂没有明显差异。鼠疫为粘菌提供了额外的重要食物资源,主要在其他猎物的可利用性下降时被消耗,例如在秋天和水柱深层。但是,类胡萝卜素捕食的是与粘胶相同的食物生物,这表明鱼类和类胡萝卜素之间的食物竞争非常激烈。

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