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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >The role of larval supply and competition in controlling recruitment of the temperate coral Oculina arbuscula
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The role of larval supply and competition in controlling recruitment of the temperate coral Oculina arbuscula

机译：幼虫供应和竞争在控制温带珊瑚Oculina arbuscula募集中的作用

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摘要

Recruitment success in sessile benthic invertebrates that produce pelagic larvae is an emergent property of larval supply, settlement rates, and post-settlement survival. While intuitive that larval supply and settlement rates should be positively correlated, previous studies have demonstrated that many factors, such as competition for limited space on hard substrata, may decouple this relationship. Oculina arbuscula is a temperate, broadcast spawning coral and is the only structurally complex Scleractinian occurring on hard bottom reefs of the South Atlantic Bight (SAB), a region located in the North Atlantic Ocean off the southeastern coast of the U.S.A. Planula larvae of this species must settle on hard-bottom substrate that is densely colonized by a diversity of sessile benthic invertebrates, including sponges, bryozoans, and ascidians. To investigate the relative roles of larval supply and competition for space on the recruitment dynamics of O. arbuscula, settlement to and survival on 30 x 30 cm plots was monitored over 5 years on a reef off the coast of Georgia, U.S.A. Treatments consisted of 10 replicates of each of the following: 1) unmanipulated natural substrate, 2) natural substrate initially cleared of encrusting competitors such as sponges and tunicates, and 3) artificial substrate composed of concrete paving tiles. These plots were photographed 3-5 times per year between July 2004 and June 2009. These images showed that O. arbuscula recruits throughout the year in the SAB with a peak in September/October. While recruitment rates were higher than death rates in all treatments and resulted in a net gain of O. arbuscula colonies, recruitment to artificial substrate far-exceeded that found on natural surfaces. The high recruitment rates observed on artificial substrate ruled out the possibility that maintenance of O. arbuscula populations on natural surfaces is limited by larval supply. Competition with other sessile invertebrates, such as ascidians and sponges, also appeared to contribute to differences in recruitment among treatments, however, comparisons between cleared and unmanipulated control plots on natural substrate suggested that the competition effect was small. Based on these findings as well as anecdotal observations suggesting that sediment accumulates less on the artificial substrate, the alternative hypothesis that O. arbuscula populations in this system are controlled by physical factors, especially sedimentation, is proposed and warrants further investigation.
机译：产生上层幼虫的无底栖无脊椎动物的成功招募是幼体供应，沉降率和定居后存活的新兴特征。虽然直观地知道幼虫的供应和沉降速率应呈正相关，但先前的研究表明，许多因素（例如争夺硬质基质上有限空间的竞争）可能会解除这种关系。 Oculina arbuscula是一种温带，繁殖的产卵珊瑚，是唯一发生在南大西洋海岸线（SAB）硬底礁上的结构复杂的Scleractinian，该区域位于美国东南沿海的北大西洋北部，该物种的Planula幼虫必须在坚硬的底物上定居，底物被各种各样的无底栖无脊椎动物（包括海绵，苔藓动物和海鞘）密集地定殖。为调查幼虫供应和空间竞争对丛枝拟南芥（A. arbuscula）募集动态的相对作用，在美国佐治亚州沿海的一个礁石上对5 x 30 cm 30 cm地块的定居和生存进行了5年的监测。下列各项的复制品：1）未经处理的天然基材，2）最初清除了诸如海绵和外包装的竞争者的天然基材，以及3）由混凝土铺路砖组成的人造基材。这些地块在2004年7月至2009年6月之间每年被拍摄3-5次。这些图像显示，一年中O. arbuscula新兵在SAB中的活动在9月/ 10月达到顶峰。虽然在所有治疗中招募率均高于死亡率，并导致了棉铃虫菌落的净增加，但对人工基质的招募远远超过了自然表面上的招募。在人工底物上观察到的高募集率排除了在幼虫的自然表面上维持丛枝稻种群的可能性。与其他无脊椎动物，例如海鞘和海绵的竞争似乎也促进了处理之间的募集差异，但是，在天然基质上清除和未操作的对照样地之间的比较表明竞争效果很小。根据这些发现以及轶事性观察表明，沉积物在人造基质上的积聚较少，提出了另一种假设，即该系统中的棉铃虫种群受物理因素（尤其是沉积物）控制，值得进一步研究。

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