Regionally isolated populations of an imperiled Caribbean coral, Acropora palmata
Regionally isolated populations of an imperiled Caribbean coral, Acropora palmata
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DOI：
10.1111/j.1365-294x.2005.02489.x
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发表时间：
2005-04-01
影响因子：
4.9
通讯作者：
Hellberg, ME
中科院分区：
文献类型：
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作者：
Baums, IB;Miller, MW;Hellberg, ME
幼虫在海洋种群之间的移动很难直接追踪，并且一直是很多争议的话题，特别是在加勒比地区。争论的焦点是人口在多大程度上是开放的，这样枯竭的人口可以通过从遥远的健康人口中招募来补充，或者在人口上是封闭的，因此需要本地管理。鉴于许多热带珊瑚礁种群的萧条状态，对这些运动的了解现在对海洋保护区的数量、位置和规模至关重要。大多数遗传分析都假设扩散模式已经稳定了数千代，因此它们通常更多地反映了过去的殖民历史，而不是正在进行的扩散。然而，最近开发的多位点基因分型方法已被证明能够在更短的时间内检测迁移和群体隔离。此前，我们开发了五个微卫星标记，并证明它们既是孟德尔标记又是珊瑚特定的。利用这些标记和贝叶斯分析，我们在此表明，濒危的造礁珊瑚（鹿角珊瑚）种群最近在加勒比西部和东部之间很少或没有经历过基因交换。波多黎各被认为是两个次区域之间的混合区域。由于这种区域隔离，西加勒比和东加勒比的人口应该有适应当地条件的潜力，并且需要针对具体人口的管理策略。
The movements of larvae between marine populations are difficult to follow directly and have been the subject of much controversy, especially in the Caribbean. The debate centres on the degree to which populations are demographically open, such that depleted populations can be replenished by recruitment from distant healthy populations, or demographically closed and thus in need of local management. Given the depressed state of many tropical reef populations, the understanding of these movements now bears critically on the number, placement, and size of marine reserves. Most genetic analyses assume that dispersal patterns have been stable for thousands of generations, thus they commonly reflect past colonization histories more than ongoing dispersal. Recently developed multilocus genotyping approaches, however, have the demonstrated ability to detect both migration and population isolation over far shorter timescales. Previously, we developed five microsatellite markers and demonstrated them to be both Mendelian and coral-specific. Using these markers and Bayesian analyses, we show here that populations of the imperiled reef-building coral, Acropora palmata, have experienced little or no recent genetic exchange between the western and the eastern Caribbean. Puerto Rico is identified as an area of mixing between the two subregions. As a consequence of this regional isolation, populations in the western and eastern Caribbean should have the potential to adapt to local conditions and will require population-specific management strategies.