What controls tropical reef fish populations: recruitment or benthic mortality? An example in the Caribbean reef fish Haemulon flavolineatum
What controls tropical reef fish populations: recruitment or benthic mortality? An example in the Caribbean reef fish Haemulon flavolineatum
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是什么控制着热带珊瑚鱼的数量：补充或底栖死亡率？
DOI：
10.3354/meps039233
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
J. Ogden
中科院分区：
文献类型：
--
作者：
M. Shulman;J. Ogden
从浮游幼虫阶段的回收被认为是限制海洋生物，部分热带礁鱼种群的一个重要因素。1978年10月至1980年12月，在美国圣克鲁瓦泰格湾部分海域，对黄纹海鲶（Haemulidae flavolineatum）幼鱼大小级的种群密度和繁殖率进行了监测。S.弗尔金群岛。在我们的研究区域内，95%的新沉积物沉积在砂和海草泻湖底部，并在几周内迁移到附近的礁上;剩余的5%直接沉积在礁结构上。平均每年补充率为1.8只/m2礁底，相当于每年每m2礁后栖息地补充44只，是迄今报道的礁鱼类的最高补充率。定居后的死亡率也很高。在底栖动物生活的第一个月，它是0.9，在第一年，它是> 0.992。本文提出了一个确定限制成年种群规模的多个因素或过程的相对影响的灵敏度分析准则。我们所用的准则是成年种群规模对这些因素或过程的比例变化的相对灵敏度。利用一个开放的、与密度无关的底栖黑鲈种群动态模型，我们估计，恢复后死亡率的变化对大型幼鱼丰度的影响比恢复率的比例变化大100倍。因此，我们得出结论，无论死亡率是否与密度无关，控制B e h ~ c死亡率的因素在法国咕噜鱼的底栖种群动态中比补充率重要得多。同样的分析也适用于其他有适当数据的珊瑚礁鱼类;我们得出结论，对于3个物种中的2个，其补充限制已被证明，B e h ~ c死亡率的变化可能比补充率的相应变化对成年种群大小的影响更大
Recru~tment from a planktonic larval stage has been proposed to be a n important factor in l im~ting populations of marine organisms, part~cularly troplcal reef fishes. We monitored r ec ru~ t~nen t and populat~on densities of juven~le size classes In French grunt Haemulon flavolineatum (Haemulidae) from October 1978 through December 1980 In a portion of Tague Bay, St. Croix, U. S. Vlrgin Islands. Withln our study area, 95 % of new recrults settled onto the sand and seagrass lagoon floor and wi th~n a few weeks migrated to nearby reefs; the remalnlng 5'10 settled d~rectly onto reef structures. hIean annual recruitment rate was 1.8 recrults per m2 of lagoon floor, equivalent to 44 recruits per m2 of luvenlle (backreef) habitat per yr and among t h c h~ghes t recruitment rates yet reported for reef fishes. Post-settlement mortality was also very high. d u r ~ n g the first month of benthic life it was 0.9 and during the first year was > 0.992. We propose a s ens~ t~v i ty analysis criterion for determining the relative ~nf luence of multiple factors or processes that llmit adult population slze The critenon we used is the relatlve senslt~vity of adult population size to proportionate changes in those factors or processes. Using an open, dens~ ty -~ndependen t model of benthlc populat~on dynamics for French grunts, we estimate that changes In post-recru~tment mortality rate \v111 have a 100 tlmes greater effect on the abundance of large juveniles than a proportionate change In recruitment rate Therefore we conclude that, whether or not mortality 1s density-~ndependent, the factors controlling b e n t h ~ c mortality are much more Important in the ben th~c populat~on dynam~cs of French grunts than 1s the recruitment rate. The same analysis is applied to other coral reef flshes for which appropriate data are ava~lable ; \ye conclude that for 2 out of 3 species for whlch recruitment limitation has been demonstrated, changes in b e n t h ~ c mortahty are hkely to have a stronger influence on adult populat~on sizes than are propoi-tlonately equivalent changes in recruitment rate