Feeding preferences of an invasive Ponto-Caspian goby for native and non-native gammarid prey
Feeding preferences of an invasive Ponto-Caspian goby for native and non-native gammarid prey
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DOI：
10.1111/fwb.12647
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发表时间：
2015-10-01
影响因子：
2.7
通讯作者：
Bacela-Spychalska, Karolina
中科院分区：
文献类型：
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作者：
Blonska, Dagmara;Grabowska, Joanna;Bacela-Spychalska, Karolina
1. 当入侵捕食者遇到本地和入侵猎物时，可能会出现两种情况：捕食者可能会从幼稚的本地猎物的存在中受益，或者从其起源地区选择猎物，这反映了它们共同的进化历史。2．为了确定入侵捕食者与本地和入侵猎物之间的相互作用，我们使用滨里海竞种虾虎鱼 Babkagymnotrachelus 作为捕食者，用伽马科动物作为猎物：本地 Gammarus fossarum 和滨里海 Dikerogammarus villosus 和 Pontogammarus robustoides。我们假设猎物来源会影响鱼类的偏好和生长速度，并进行了一系列鱼类捕食和生长的实验室实验，并估计了不同来源猎物的盈利能力。 3．与滨里海伽马目相比，虾虎鱼更喜欢本地猎物，无论猎物的运动性、庇护所的存在或水生化学信号如何。此外，当喂食本地猎物时，鱼生长得更好。4。因此，我们建议鱼类的选择性基于与伽马直接接触期间猎物质量的评估。由滨里海伽马科组成的饮食不利于来自同一地区的入侵者，而本地猎物物种的存在使入侵者受益更多。5。滨里海伽马和虾虎鱼是内陆水域（通常是主要河流）的成功入侵者。与入侵的伽马科动物相比，虾虎鱼进入较小的支流，作为本地伽马科动物的避难所。我们表明，虾虎鱼可能会受益于这些地方本地猎物物种的存在。
1. When an invasive predator encounters native and invasive prey, two scenarios are possible: the predator may benefit from the presence of naive native prey or choose prey from its region of origin, reflecting their common evolutionary history.2. To determine interactions between an invasive predator and native and invasive prey, we used the Ponto-Caspian racer goby Babka gymnotrachelus as predator and gammarids as prey: native Gammarus fossarum and Ponto-Caspian Dikerogammarus villosus and Pontogammarus robustoides. We hypothesised that prey origin would affect fish preferences and growth rate and conducted a series of laboratory experiments on fish predation and growth and estimated profitability of prey of different origin.3. The goby preferred native prey to the Ponto-Caspian gammarids, irrespective of prey motility, the presence of shelters or waterborne chemical cues. Moreover, fish grew better when fed native prey.4. Thus, we suggest that fish selectivity was based on the assessment of prey quality during direct contact with gammarids. A diet consisting of Ponto-Caspian gammarids did not facilitate an invader originating from the same region, which benefited more from the presence of a local prey species.5. Ponto-Caspian gammarids and gobies are successful invaders in inland waters, usually main rivers. The gobies, in contrast to the invasive gammarids, enter smaller tributaries that serve as refugia for native gammarids. We show that the gobies may benefit from the presence of native prey species in such locations.