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首页> 外文期刊>Coral reefs: journal of the International Society for Reef Studies >Coexistence of congeneric spiny lobsters on coral reefs: differences in conspecific aggregation patterns and their potential antipredator benefits
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Coexistence of congeneric spiny lobsters on coral reefs: differences in conspecific aggregation patterns and their potential antipredator benefits

机译：在珊瑚礁上共生多刺龙虾共存：同种异体聚集模式的差异及其潜在的反捕食者利益

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摘要

Den sharing by conspecific spiny lobsters (aggregation) is modulated by chemical attraction but may confer several, not necessarily mutually exclusive, antipredator byproduct benefits: a "guide effect", which only benefits the individual attracted to a sheltered conspecific; a "dilution effect", which reduces per-capita risk of predation simply through aggregation; or active "group defense". Each potential benefit has a different set of predictors (relationships between aggregation and conspecific or predator densities), but conflicting results could suggest the simultaneous operation of more than one benefit. These predictions were tested for coexisting Panulirus guttatus (a reef-obligate) and Panulirus argus (a temporary reef-dweller) using data collected during 11 surveys on fixed sites over a coral reef in Mexico. P. guttatus greatly outnumbered P. argus, but P. argus showed a greater tendency to aggregate. All three benefits of den sharing operated for the more social P. argus, with "group defense" being of the most benefit for larger individuals, and the "guide" and "dilution" effects for smaller individuals recently immigrating into the reef habitat and sharing dens with larger conspecifics. P. guttatus did not display "group defense" and its aggregations appeared to be modulated by the interplay between attraction and aggressive behaviors. This species relied more on solitary crypticity, especially at larger sizes, but appeared to benefit from a "guide effect" at high conspecific densities. In experimental tanks, each species tended to aggregate when tested separately, but when tested jointly, aggregation among P. guttatus was significantly reduced. The experimental results reflect the differential patterns of aggregation between the fore-reef, where P. guttatus dominated, and the back-reef, where coexistence of both species was greater.
机译：具特异性的刺龙虾（聚集体）的窝共享受化学吸引作用调节，但可能赋予抗掠食者副产物多种（不一定是互斥的）益处：“引导作用”，仅对被庇护的具特异性的个体有益。 “稀释效应”，仅通过聚集即可降低人均被捕食的风险;或主动的“团体防御”。每个潜在利益都有一组不同的预测变量（聚集与同种或捕食者密度之间的关系），但结果相互矛盾可能暗示多个利​​益同时运作。使用在墨西哥珊瑚礁上的固定地点进行的11项调查收集的数据，对这些预测进行了测试，以评估共存的Panulirus guttatus（专为礁石）和Panulirus argus（临时的礁石居民）。 P. guttatus大大超过了A. argus，但是A. argus显示出更大的聚集趋势。巢穴共享的所有三个好处都针对更社交化的P. argus，其中“团体防御”对较大的个体最有利，而最近移民到珊瑚礁栖息地并共享的较小个体的“引导”和“稀释”效应具有较大种的窝点。 gu.tus没有表现出“群体防御”，它的聚集似乎受到吸引力和攻击行为之间相互作用的调节。该物种更依赖于单独的隐秘性，尤其是在较大的物种中，但是似乎受益于高同种密度的“引导效应”。在实验缸中，每种物种在单独测试时趋于聚集，但在联合测试时，牙形毕赤酵母之间的聚集显着减少。实验结果反映了前礁和后礁之间聚集的差异模式，前礁主要是古塔角鲨（P. guttatus），而后礁则两种物种共存更大。

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