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首页> 外文期刊>Marine biology >Contrasting distribution and foraging patterns of herbivorous and detritivorous fishes across multiple habitats in a tropical seascape
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Contrasting distribution and foraging patterns of herbivorous and detritivorous fishes across multiple habitats in a tropical seascape

机译：在热带海景的多个生境中，草食性和有害性鱼类的分布和觅食方式不同

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摘要

Understanding drivers behind patterns of functionally important groups of fishes is crucial for successful management and conservation of tropical seascapes. Herbivorous fishes are the most prominent consumers of marine primary production which can have profound effects on reef resilience. We explored environmental variables affecting distribution and foraging patterns of herbivorous and detritivorous fish assemblages (siganids, acanthurids and parrotfish) across distinct shallow-water habitats (coral reefs, macroalgae beds and seagrass meadows) during September-November 2016 at Mafia Island, Tanzania (8 degrees 00S, 39 degrees 41E). We performed underwater visual census to quantify fish assemblages, measured habitat features, deployed macroalgal assays and conducted inventories of grazing scars. Multi-dimensional scaling and mixed-effects linear models were used to evaluate differences in fish assemblages and environmental variables influencing abundance and foraging patterns of fishes. Fish communities of focal functional groups differed among habitats. Abundance of herbivores and detritivores as well as relative browsing and scraping was highest on coral reefs compared to macroalgae and seagrass meadows.Adult fish were more abundant on coral reefs while juveniles were abundant in macroalgal beds. Coral cover and crustose coralline algal cover had a positive effect on the abundance of fish in coral reef areas, while macroalgal cover had a negative effect. Contrastingly, in macroalgae habitats, macroalgal cover had a positive effect on the abundance of parrotfish. These results highlight the importance of considering connectivity between macroalgal beds and coral reefs through ontogenetic shifts in habitat use by primarily microphagous parrotfish and of incorporating a range of habitats within coastal management plans.
机译：了解功能重要的鱼类群背后的驱动因素对于成功管理和保护热带海景至关重要。食草鱼类是海洋初级产品的最主要消费者，对珊瑚的复原力可能会产生深远影响。我们在2016年9月至11月于坦桑尼亚黑手党岛（8）上探索了不同的浅水生境（珊瑚礁，大型藻类河床和海草草甸）上食草性和有害性鱼类组合（类gan科动物，棘皮动物和鹦嘴鱼）的分布和觅食模式的环境变量00S，39度41E）。我们进行了水下视觉普查，以量化鱼类组合，测量栖息地特征，部署大型藻类检测方法并进行了放牧疤痕清单。多维比例缩放和混合效应线性模型用于评估鱼类组合的差异以及影响鱼类丰度和觅食方式的环境变量。重点功能群的鱼类群落在生境之间有所不同。与大型藻类和海草草甸相比，珊瑚礁中的草食动物和有害生物丰富，相对浏览和刮擦最高。成年鱼类在珊瑚礁中丰富，而幼鱼在大型藻类床上丰富。珊瑚覆盖和硬壳珊瑚藻覆盖对珊瑚礁地区鱼的丰度有积极影响，而大型藻覆盖则有负面影响。相反，在大型藻类生境中，大型藻类的覆盖对鹦鹉鱼的数量有积极的影响。这些结果凸显了考虑通过主要由微噬食性鹦鹉鱼在生境使用中发生的遗传学转变来考虑大型藻类床和珊瑚礁之间的连通性以及将一系列生境纳入沿海管理计划的重要性。

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    《Marine biology》 |2019年第4期|51.1-51.16|共16页
  • 作者

    Eggertsen M.; Chacin D. H.; Akerlund C.; Halling C.; Berkstrom C.;

  • 作者单位

    Stockholm Univ, Dept Ecol Environm & Plant Sci, S-10691 Stockholm, Sweden;

    Univ S Florida, Coll Marine Sci, St Petersburg, FL 33701 USA;

    Stockholm Univ, Dept Ecol Environm & Plant Sci, S-10691 Stockholm, Sweden;

    Stockholm Univ, Dept Ecol Environm & Plant Sci, S-10691 Stockholm, Sweden;

    Stockholm Univ, Dept Ecol Environm & Plant Sci, S-10691 Stockholm, Sweden|Swedish Univ Agr Sci, Inst Coastal Res, Dept Aquat Resources, S-74242 Oregrund, Sweden;

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