Feeding and egg production of Oithona spp. in tropical waters of North Queensland, Australia
Feeding and egg production of Oithona spp. in tropical waters of North Queensland, Australia
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DOI：
10.1093/plankt/fbu039
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发表时间：
2014-07
影响因子：
2.1
通讯作者：
S. Zamora-Terol;A. McKINNON;E. Saiz
中科院分区：
文献类型：
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作者：
S. Zamora-Terol;A. McKINNON;E. Saiz
尽管Oithona属小型桡足类在海洋浮游生态系统中的重要性已得到公认，但有关其在热带环境中的生态作用、潜在食物资源和产蛋率（EPR）的信息却很少。2011年秋季，在澳大利亚北昆士兰州两个不同的热带海洋食物网中，对两种Oithona雌成虫的摄食和EPR进行了测定。研究了大堡礁泻湖沃茨中的Oithona attenuata，研究了红树林地区的Oithona dissimilis。长蝽属摄入的甲藻和纤毛虫优先于其他猎物项目的纳米和微型浮游生物组合。长蝽属甲藻和纤毛虫的清除率分别为雌性^-1天^-1 3.7至10.4毫升，雌性^-1天^-1 4.3至18.1毫升。摄食甲藻时，每只雌虫每日摄食的碳量<1%，而摄食纤毛虫时，每只雌虫每日摄食的碳量在1%~ 10%之间。我们的研究结果表明，Oithona spp.以小鞭毛虫（5-20 μm）为食，尽管碳对饮食的贡献很低（2.5-3.2%的身体碳）。产蛋量和体重特异性EPR的范围分别为0.22 - 3.34个卵和0.2-4.5%。在所有的饲养实验中测量的摄食率太低，以维持代谢和产蛋成本，表明其他食物资源，没有考虑在这项研究中，可能会显着贡献的饮食Oithona属。在热带环境中。
Despite the acknowledged importance of small copepods of the genus Oithona in marine pelagic ecosystems, there is little information about their ecological role, potential food resources and egg production rates (EPR) in tropical environments. In the present study, feeding and EPR of adult females of two species of Oithona were determined in two different tropical marine food webs in North Queensland, Australia, during the 2011 austral autumn. Oithona attenuata was studied in the waters of the Great Barrier Reef lagoon, and Oithona dissimilis was studied in a mangrove area. Oithona spp. ingested dinoflagellates and ciliates preferentially to other prey items of the nano- and microplankton assemblage. Oithona spp. clearance rates on dinoflagellates and ciliates ranged from 3.7 to 10.4 mL female^−1 day^−1, and from 4.3 to 18.1 mL female^−1 day^−1, respectively. The daily body carbon ingested per female was <1% when feeding on dinoflagellates, and varied from 1 to 10% when feeding on ciliates. Our results suggest that Oithona spp. feed on small flagellates (5–20 μm), although the contribution of carbon to the diet was low (2.5–3.2% body carbon). Egg production and weight-specific EPR ranged from 0.22 to 3.34 eggs female^−1 day^−1, and 0.2–4.5% day^−1 respectively. The ingestion rates measured in all the feeding experiments were too low to sustain metabolic and egg production costs, indicating that other food resources, not considered in this study, might contribute significantly to the diet of Oithona spp. in tropical environments.