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首页> 外文期刊>Limnologica >Diet and feeding strategies of round goby, Neogobius melanostomus (Pallas, 1814) from the invasion front in the Danube River tributaries (Bulgaria): ontogenetic shift and seasonal variation
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Diet and feeding strategies of round goby, Neogobius melanostomus (Pallas, 1814) from the invasion front in the Danube River tributaries (Bulgaria): ontogenetic shift and seasonal variation

机译：来自多瑙河支流（保加利亚）的入侵前部（保加利亚）的入侵前沿，圆形goby的饮食和喂养策略

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摘要

The round goby Neogobius melanostomus is one of the most successful Ponto-Caspian fish invaders, established in a variety of aquatic ecosystems throughout Europe and North America. Diet and feeding strategies of N. mela-nostomus from three recently invaded tributaries of the Lower Danube River (Bulgaria) were investigated. Research design is based on monthly examination of the round goby diet and macroinvertebrate density. The results show that the round goby consume a wide range of different organisms - 76 taxa in total (identified to family, genus or species level). The most common prey taxa in all three rivers were Chironomidae (Orthocladius/Cricotopus spp., Tanytarsini g. sp.), Trichoptera larvae (Psychomyiidae g. sp., Hydropsyche spp.) and Ephemeroptera nymphs (Baetis spp.). Only in one of the rivers, a predominant feeding on crustaceans (Gammarus spp.) was observed. The taxonomical composition of consumed invertebrates suggests that the round goby prefers the ecological group of "sprawling/walking" insect larvae associated to coarse substratum. Feeding ac-tivity was observed throughout the whole year, even during low-temperature months. Three seasonal and four size-depended shifts in the species' diet were determined. Generalization feeding tactics predominated in all three rivers. Specialization was rare and specific for each tributary, where a few individuals consumed in-vertebrates from fine substratum and/or submerged vegetation. Possible relationships between the spread of N. melanostomus and the recent invasion of the Asian clam (Corbicula fluminea) in the Bulgarian Danube tributaries were discussed. Generalisation and feeding plasticity contribute to the round goby's establishment success in the Danube tributaries and might facilitate its further upstream spread.
机译：圆形戈斯新罗布斯Melanostomus是最成功的Ponto-Caspian Fish Invers之一，在欧洲和北美的各种水生生态系统中建立。研究了来自较近多瑙河（保加利亚）的三名最近入侵的三个彻底的支流中N.Mela-nostomus的饮食和喂养策略。研究设计基于每月考试圆虎牛饮食和大型脊椎门密度。结果表明，圆形曲面消耗了各种不同的生物 - 76个分类群（鉴定为家庭，属或物种级别）。所有三个河流中最常见的猛禽素是依甲酰胺（Orthocladius / Cricotopus spp。，Tanytarsini g. sp.），Trichoptera幼虫（Psyscomyiidae g. sp。，水分精体spp。）和ephemeroptera若虫（baetis spp。）。只有在其中一个河流中，观察到甲壳类动物（γSPP）的主要饲养。消耗的无脊椎动物的分类作用表明，圆形果蝇更喜欢与粗底皮相关的“蔓延/行走”昆虫幼虫的生态组。即使在低温月份，始终在全年观察到喂养AC-T之间。确定了物种饮食中的三个季节性和四个尺寸依赖的转变。在所有三条河流中占主导地位的泛化饲养策略。专业化对每个支流都很罕见，特定于每条支流，其中一些人从细菌和/或浸没植被中消耗脊椎动物。讨论了N.Melanostomus的扩散与亚洲蛤（Corbicula Flumea）在保加利亚多瑙河支流中的可能关系。泛化和饲养可塑性有助于圆形戈布在多瑙河支流中的成功，并可能促进其进一步的上游蔓延。

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