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Experimental analysis of the territorial establishment of ayu, Plecoglossus altivelis

机译：香a（Plecoglossus altivelis）领土建立的实验分析

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摘要

Ayu mainly grazes benthic algae on river beds. To clarify the effects of individual behavioral differences on the territory establishment of ayu, we first recorded the number of active movements, aggression towards a wooden ayu model, and scraping feeding activities for 40 ayu, each in an aquarium with a ceramic plate with benthic algae. We then released 10 randomly chosen ayu and other cyprinids, 10 Tribolodon hakonensis and 10 Zacco platypus, into each of the four ponds with recirculating water. Four to six ayu established a territory for 1-20 of the 21 days observed in each pond. Territories were unstable in the first half period but became stable in the latter period. Territorial period was positively correlated with the number of active movements in aquaria and negatively with the number of conspecific invasions. The percentage of attacks against other species was positively correlated with the number of scraping behavior in aquaria and negatively with standard length of ayu. The growth rate of non-territorial ayu was large in case the ayu scraped more than half of ceramic plates in aquaria. In contrast, the growth rate of territorial ayu was correlated negatively with the standard length of ayu, and the percentage of attacks against other species, indicating that individual behavioral differences and the defending cost were both important in territory establishment and growth.
机译：阿玉主要在河床上放牧底栖藻类。为了弄清个体行为差异对ayu领土建立的影响，我们首先记录了活跃运动的次数，对木制ayu模型的侵略以及40 ayu的抓取觅食活动，每个活动都在带有底栖藻类陶瓷板的水族馆中进行。 。然后，我们在循环水的四个池塘中分别释放了10个随机选择的香鱼和其他鲤鱼，10个Tribolodon hakonensis和10个Zacco platypus。在每个池塘中观察到的21天中，有4至6个ayu建立了1-20天的领土。领土在上半年不稳定，但在后期稳定。领土时期与水族箱中活跃活动的数量呈正相关，与同种入侵的数量呈负相关。攻击其他物种的百分比与水族箱中刮ing行为的数量呈正相关，而与鱼苗的标准长度呈负相关。如果在一块水族馆中刮擦了超过一半的陶瓷板，则非区域性大鱼的增长率很高。相比之下，领土大鱼的生长速度与大鱼的标准长度以及对其他物种的攻击百分比呈负相关，这表明个体行为差异和防御成本在领土建立和增长中均很重要。

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