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Behavioral patterns of two fiddler crab species Uca rapax and Uca tangeri in a seminatural mangrove system
Zoo Biology ( IF 1.2 ) Pub Date : 2019-05-06 , DOI: 10.1002/zoo.21488
Robbert A F van Himbeeck 1 , Willeke Huizinga 2 , Ivo Roessink 3 , Edwin T H M Peeters 1
Affiliation  

Zoos increasingly transform their exhibitions from traditional one‐species enclosures to more natural exhibits, that is, environments that capture part of an ecosystem including a selection of animals and plants that occur there. Thus, enhancing the experience of its human visitors while also allowing its residents to possibly show more natural behavior. In 2017 Royal Burger's Zoo (Arnhem, The Netherlands) created and opened a mangrove‐like environment containing fiddler crabs. Fiddler crabs display a broad range of behaviors, and this research examines which wild‐type behavior and behavioral patterns can be observed on a seminatural mudflat. The behavior shown by Uca rapax and Uca tangeri on the mudflat was counted each hour between 07:00 and 17:00. An asymmetric tidal regime was present in the enclosure including two high water periods. Various known fiddler crab behaviors, including waving and combat, were observed but no copulation. A clear pattern in exposed crabs on the mudflat was found, with low numbers visible in the early morning and the highest numbers present in the early afternoon, while number of visitors did not have a significant effect on this pattern. Interestingly, the highest abundances were not observed around the ebbing tide (07:00–09:00), as observed in the wild, but somewhat later, possibly due to the asymmetric tidal scheme or the interaction of tidal and daily rhythms. This study shows that in captivity, fiddler crabs indeed show a range of natural behaviors which is linked to the tidal and possibly daily rhythm as well.

中文翻译:

半自然红树林系统中两种招潮蟹物种 Uca rapax 和 Uca tangeri 的行为模式

动物园越来越多地将他们的展览从传统的单一物种围栏转变为更自然的展览,即捕捉生态系统一部分的环境,包括在那里发生的一系列动物和植物。因此,增强了人类访客的体验,同时也允许其居民表现出更自然的行为。2017 年,皇家汉堡动物园(荷兰阿纳姆)创建并开放了一个类似红树林的环境,里面有招潮蟹。招潮蟹表现出广泛的行为,这项研究检验了在半自然泥滩上可以观察到哪些野生型行为和行为模式。在 07:00 到 17:00 之间每小时计算一次 Uca rapax 和 Uca tangeri 在泥滩上的行为。围场中存在不对称的潮汐情况,包括两个高水期。观察到各种已知的招潮蟹行为,包括挥手和战斗,但没有交配。在泥滩上发现暴露的螃蟹有明显的模式,清晨可见数量较少,下午出现数量最多,而游客数量对这种模式没有显着影响。有趣的是,在退潮附近(07:00–09:00)没有观察到最高丰度,正如在野外观察到的那样,但稍晚一些,可能是由于不对称潮汐方案或潮汐和日常节奏的相互作用。这项研究表明,在圈养环境中,招潮蟹确实表现出一系列与潮汐和可能的日常节奏有关的自然行为。在泥滩上发现暴露的螃蟹有明显的模式,清晨可见数量较少,下午早些时候出现数量最多,而游客数量对这种模式没有显着影响。有趣的是,在退潮(07:00-09:00)附近没有观察到最高丰度,如在野外观察到的那样,但稍晚一些,可能是由于不对称潮汐方案或潮汐和日常节奏的相互作用。这项研究表明,在圈养环境中,招潮蟹确实表现出一系列与潮汐和可能的日常节奏有关的自然行为。在泥滩上发现暴露的螃蟹有明显的模式,清晨可见数量较少,下午出现数量最多,而游客数量对这种模式没有显着影响。有趣的是,在退潮(07:00-09:00)附近没有观察到最高丰度,如在野外观察到的那样,但稍晚一些,可能是由于不对称潮汐方案或潮汐和日常节奏的相互作用。这项研究表明,在圈养环境中,招潮蟹确实表现出一系列与潮汐和可能的日常节奏有关的自然行为。正如在野外观察到的那样,在退潮前后(07:00–09:00)没有观察到最高丰度,但稍晚一些,可能是由于不对称潮汐方案或潮汐和日常节奏的相互作用。这项研究表明,在圈养环境中,招潮蟹确实表现出一系列与潮汐和可能的日常节奏有关的自然行为。正如在野外观察到的那样,在退潮前后(07:00–09:00)没有观察到最高丰度,但稍晚一些,可能是由于不对称潮汐方案或潮汐和日常节奏的相互作用。这项研究表明,在圈养环境中,招潮蟹确实表现出一系列与潮汐和可能的日常节奏有关的自然行为。
更新日期:2019-05-06
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