Cohabitation of Competing Territorial Damselfishes on a Caribbean Coral Reef
Cohabitation of Competing Territorial Damselfishes on a Caribbean Coral Reef
复制标题
加勒比珊瑚礁上相互竞争的领地雀鲷的共居
DOI：
--
复制
发表时间：
1984
期刊：
影响因子：
--
通讯作者：
D. R. Robertson
中科院分区：
文献类型：
--
作者：
D. R. Robertson
三条加勒比海豆娘鱼的个体成鱼保卫与同种成鱼不重叠的觅食区域。这两个较小的物种--背腹潜蝇和平腹潜蝇的成虫的取食区域并不在种间重叠。然而，最大的物种--雏龙的成体的觅食区域与两个剑齿目的成体和幼体的觅食区域是重叠的。大物种咄咄逼人地支配其较小的种间共生体。每一物种的同居个体都吃相同类型的底栖微藻。金丝猴与这两个小物种的摄食活动具有相同的每日周期，使用与它们相同的摄食微生境，并且几乎只在它们的摄食区域觅食。同居者保护它们的觅食区域不受其他草食性鱼类的伤害，但菊鱼参与防御行动的频率比它的任何一种小型同居者都要少得多。在这种防御方面，金黄分枝杆菌的效率也比至少一种同居者--多氏分枝杆菌要差得多。与对照珊瑚礁上的细菌相比，被移走的珊瑚礁上的金枪鱼增加了更多的体重，脂肪沉积也更多。因此，茧蜂的成虫似乎是依赖它们的依赖，利用它们基于大小的优势能力从它们的同居者那里获取食物。菊鱼和金鱼幼体在同一微生境中表现出小规模的栖息地隔离和摄食底物的分离使用，这可能有助于这两个物种的招募。
Individual adults of three Caribbean damselfishes defend feeding areas that do not overlap with those ofconspecific adults. The feeding areas of adults of the two smaller species, Stegastes dorsopunicans and S. planifrons, do not overlap interspecifically. However, feeding areas of adults of the largest species, Microspathodon chrysurus, are superimposed on feeding areas of adults and juveniles of the two Stegastes species. The large species aggressively dominates its smaller interspecific cohabi- tants. Cohabitant individuals of each species eat the same types of benthic microalgae. M. chrysurus has the same daily cycle of feeding activity as the two small species, uses the same feeding microhabitats as they do, and feeds almost exclusively in their feeding areas. Cohabitants defend their feeding areas against the same set of other herbivorous fishes, but M. chrysurus is involved in defensive actions much less frequently than is either of its small cohabitants. M. chrysurus also is much less effective at such defense than at least one cohabitant, S. dorsopunicans. S. dorsopunicans on a reef from which M. chrysurus were removed increased their body mass more and had larger fat deposits than conspe- cifics on a control reef. Thus adults of M. chrysurus appear to be dependents that use their size-based dominance ability to obtain food from their cohabitants. Juveniles of M. chrysurus and S. dorsopun- icans exhibit small-scale habitat segregation and segregated use of feeding substrates in a shared microhabitat, which may facilitate the recruitment of both species.