Monoculture and mixed-species algal farms on a coral reef are maintained through intensive and extensive management by damselfishes
Monoculture and mixed-species algal farms on a coral reef are maintained through intensive and extensive management by damselfishes
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DOI：
10.1016/j.jembe.2004.08.009
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发表时间：
2004-12-30
影响因子：
2
通讯作者：
Kato, M
中科院分区：
文献类型：
--
作者：
Hata, H;Kato, M
由不同种类的领土性食草豆娘鱼维持的藻类养殖场的大小、藻类生物量和物种组成各不相同。为了确定影响这些农场结构的因素，我们比较了同域分布的两种雀鲷，Stegastes nigricans（Lacepede）和S。obreptus（惠特利），保持两种不同类型的农场在冲绳，日本南部。通过清除难消化的藻类和迅速排除草食性鱼类和食草海胆，S。相比之下，由于草食动物的延迟排除，S. nigricans管理着相对较小的农场，主要由一种藻类作物物种Polysiphonia sp. obreptus维持较大的农场入侵的各种难消化的藻类，如软骨藻和Padina sp。nigricans的单位面积藻类生物量高于S. obreptus。这项研究提供了一个新的视角，因为它表明，豆娘鱼实行密集和广泛的养殖。前者导致一个美味可口的小而高产的单一养殖农场，而后者导致大型，物种丰富，混合养殖农场。(C)2004 Elsevier B.V.保留所有权利。
Algal farms maintained by different species of territorial herbivorous damselfishes vary in size, algal biomass, and species composition. To determine the factors that affect the structure of these farms, we compared fanning behavior and intensity between two sympatric damselfish species, Stegastes nigricans (Lacepede) and S. obreptus (Whitley), which maintain two different types of farms in the Okinawa Islands, southern Japan. By weeding of indigestible algae and prompt exclusion of herbivorous fishes and grazing sea urchins, S. nigricans manage relatively small farms largely dominated by one algal crop species, Polysiphonia sp. In contrast, by delayed exclusion of herbivores, S. obreptus maintain larger farms invaded by diverse indigestible algae, such as Chondria sp. and Padina sp. As a result of intensive management, S. nigricans attains a higher algal biomass per area than does S. obreptus. This study provides a new perspective, as it suggests that damselfishes practise both intensive and extensive fanning. The former results in small and highly productive monoculture farms of one palatable alga, while the latter leads to large, species-rich, mixed-culture farms. (C) 2004 Elsevier B.V. All rights reserved.