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首页> 外文期刊>Journal of limnology >Diel vertical migration patterns in two populations of Chaoborus flavicans larvae (Diptera: Chaoboridae) in response to fish kairomones
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Diel vertical migration patterns in two populations of Chaoborus flavicans larvae (Diptera: Chaoboridae) in response to fish kairomones

机译：潮鱼黄avi幼虫（双翅目：潮bor科）的两个种群对鱼类海藻素的垂直迁移模式

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Diel vertical migration (DVM) of larvae of the phantom midge Chaoborus flavicans (Diptera: Chaoboridae) inhabiting a fishless pond and a fish-abundant lake (Lake Nakanuma) was studied in the field and in the laboratory. In the fishless pond, dissolved oxygen concentration and water temperature were homogeneously distributed in the vertical profiles and Chaoborus larvae did not show DVM. In contrast, there was thermal stratification and an anoxic layer in Lake Nakanuma, and 2nd, 3rd and 4th instar Chaoborus larvae exhibited DVM. Fourth instar Chaoborus larvae collected from the two populations were introduced into thermally stratified acrylic tubes containing 'fish water' (water conditioned by fish and containing only the fish 'smell') or control water free of fish smell after a two-day acclimatization, and the larval positions in the tubes were analysed during the day and at night. The two populations of Chaoborus larvae showed different DVM patterns in the control water: the larvae from Lake Nakanuma exhibited DVM, whereas those from the fishless pond did not. Chaoborus larvae from Lake Nakanuma responded to the fish kairomones, exhibiting marked DVM in the fish water, whereas little response to the fish smell was recognized in the larvae from the fishless pond. The presence of a difference in response between the two populations implies that they had genetically different patterns of expression of DVM and thus different behavioural responses to the fish smell. The fish smell tended to cause the Chaoborus larvae in the tubes to increase their depth, during both the day and night. The effects of the fish smell became ambiguous with time, suggesting microbial degradation of the fish kairomones.
机译：在野外和实验室研究了居住在一个没有鱼的池塘和一个鱼丰富的湖泊（中金湖）的幻影蚊（Choporus flavicans）（Diptera：Chaoboridae）的幼虫的狄尔垂直迁移（DVM）。在无鱼塘中，溶解氧浓度和水温均匀分布在垂直剖面中，潮虫幼虫未显示DVM。相反，在纳卡努马湖中有热分层和缺氧层，第二，第三和第四龄的潮虫幼虫表现出DVM。从两种群中收集的四龄潮虫幼虫被引入热分层的丙烯酸试管中，该试管含有“鱼水”（由鱼制成的水，仅含有鱼的“气味”）或经过两天的适应化处理后没有鱼腥味的对照水，以及白天和晚上分析试管中的幼虫位置。潮汕幼虫的两个种群在对照水中表现出不同的DVM模式：来自Nakanuma湖的幼虫表现出DVM，而来自无鱼塘的幼虫则没有DVM。来自纳卡努马湖的潮虫幼虫对鱼的海藻素有反应，在鱼水中显示出明显的DVM，而在无鱼塘的幼虫中对鱼味的反应却很少。两个种群之间反应差异的存在意味着它们在遗传上具有不同的DVM表达模式，因此对鱼腥味的行为反应也不同。鱼的气味在白天和晚上都倾向于使试管中的潮虫幼虫增加其深度。随着时间的流逝，鱼腥味的影响变得模棱两可，表明鱼中的卡洛莫酮已被微生物降解。

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