Grooming behaviors reduce body fouling and are well documented in crustaceans. There are more detailed laboratory-based grooming studies on fully aquatic crabs compared to semi-terrestrial crabs. By contrast, semi-terrestrial crabs are predicted to have different grooming time budgets than fully aquatic crabs because semi-terrestrial crabs are not constantly submerged in water that can mechanically remove sedimentary fouling, whereas fully aquatic crustaceans have increased fouling from algae and epibionts. We studied the grooming behaviors of two semi-terrestrial crab species. Crabs (N = 50 ghost crabs, Ocypode quadrata (Fabricius, 1787); N = 50 fiddler crabs, Minuca (Uca) burgersi (Holthuis, 1967)) were observed in isolation for 45-min trials. We recorded grooming frequency, location, appendage, and time. Ghost crabs were also observed in agonistic encounters to determine how grooming varied in the presence of a conspecific individual. Ghost crabs and fiddler crabs have different grooming time budgets, (0.526 and 0.895%, respectively) with both species having lower grooming time budgets than fully aquatic crustaceans. Some similarities and differences in grooming between the two semi-terrestrial crabs exist, with both species frequently grooming their eyes and maxillipeds using a brush or scrape mechanism, but with fiddler crabs using their eyes as a grooming appendage more frequently than ghost crabs. Ghost crab males groom less than females, whereas fiddler crab males and females groom equally. In agonistic interactions in ghost crabs, the grooming time budget decreased compared with isolated observations and individuals engaged in a “playing dead” behavior (thanatosis) after engaging in a fight. Semi-terrestrial crabs were found to groom significantly less than fully aquatic crustaceans.

中文翻译：

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半陆生蟹 Ocypodequadrata (Fabricius, 1787) 和 Minuca (Uca) Burgersi (Holthuis, 1967) 的梳理和竞争行为（十足目：Brachyura：Ocypodidae）

梳理行为可以减少身体污垢，这在甲壳类动物中已有充分记录。与半陆生螃蟹相比，对全水生螃蟹进行了更详细的实验室美容研究。相比之下，预计半陆生螃蟹的梳理时间预算与完全水生螃蟹不同，因为半陆生螃蟹不会经常浸没在可以机械去除沉积污垢的水中，而完全水生甲壳类动物则增加了藻类和表生物的污垢。我们研究了两种半陆生蟹的梳理行为。螃蟹（N = 50 只幽灵蟹，Ocypodequadrata (Fabricius, 1787)；N = 50 只招潮蟹，Minuca (Uca) Burgersi (Holthuis, 1967)）进行 45 分钟的隔离试验。我们记录了梳理毛发的频率、位置、肢体和时间。还观察了鬼蟹在竞争性遭遇中的情况，以确定在同一个体存在的情况下梳理行为如何变化。幽灵蟹和招潮蟹的梳理时间预算不同（分别为 0.526 和 0.895%），这两个物种的梳理时间预算都低于水生甲壳类动物。这两种半陆生蟹在梳理毛发方面存在一些相似之处和不同之处，这两种螃蟹都经常使用刷子或刮擦装置梳理眼睛和上颌，但招潮蟹比鬼蟹更频繁地使用眼睛作为梳理附属物。雄性鬼蟹的理毛次数少于雌性，而招潮蟹的雄性和雌性的理毛次数相同。在幽灵蟹的竞争性相互作用中，与单独观察和打架后从事“装死”行为（致死）的个体相比，梳理毛发的时间预算减少了。研究发现，半陆生螃蟹的梳理行为明显少于水生甲壳类动物。