Schmitt R, Holbrook S
Coastal Research Center, Marine Science Institute and Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, 93106, USA.
Oecologia. 2002 May;131(3):391-401. doi: 10.1007/s00442-002-0893-9. Epub 2002 May 1.
Replenishment of local populations of reef fishes typically occurs via settlement of planktonic larvae, a process that is variable in space and time. We examined spatial variation in settlement of three species of damselfishes (genus Dascyllus) in relation to variation in average near-field current speed. Although the larvae of these species colonized at the same times, they repeatedly exhibited qualitatively different spatial patterns of settlement in the lagoons of Moorea, French Polynesia. Each damselfish had a unique, temporally consistent pattern of variation in settlement relative to among-site variation in near-field flow speed. At the speeds encountered, settlement was related linearly to increasing average current flow for yellow-tail dascyllus (D. flavicaudus), was a positive but decelerating function for humbug dascyllus (D. aruanus) and was a hump-shaped function for three-spot dascyllus (D. trimaculatus). Such qualitatively different relationships could arise if variation in current speed affected an individual's probability of settling differently among the species. The generalized relationships between flow speed and settlement of these species predicted well the pattern of covariation in settlement of these species among new sites where the availability of suitable habitat was standardized. These findings imply that differences in larval abilities in the near-field can result in distinctly different patterns of larval colonization among species, even in the absence of any other source of variation.
珊瑚礁鱼类的本地种群补充通常通过浮游幼虫的定居来实现，这一过程在空间和时间上是可变的。我们研究了三种雀鲷（宅泥鱼属）的定居在空间上的变化与近场平均流速变化之间的关系。尽管这些物种的幼虫在同一时间进行定殖，但它们在法属波利尼西亚莫雷阿岛的泻湖中反复表现出定性上不同的定居空间模式。相对于近场流速的位点间变化，每种雀鲷都有独特的、随时间一致的定居变化模式。在所遇到的流速下，黄尾宅泥鱼（D. flavicaudus）的定居与平均水流增加呈线性关系，黑背宅泥鱼（D. aruanus）的定居是一个正向但减速的函数，而三斑宅泥鱼（D. trimaculatus）的定居是一个驼峰形函数。如果流速变化影响个体在不同物种间定居的概率，就可能出现这种定性上不同的关系。这些物种的流速与定居之间的一般关系很好地预测了在合适栖息地可用性标准化的新位点间这些物种定居的协变模式。这些发现意味着，即使在没有任何其他变异来源的情况下，近场中幼虫能力的差异也可能导致不同物种间幼虫定殖模式明显不同。
