Observed and modeled larval settlement of a reef fish to the Florida Keys
Observed and modeled larval settlement of a reef fish to the Florida Keys
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观察并模拟珊瑚鱼幼虫在佛罗里达群岛的定居
DOI：
10.3354/meps09641
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发表时间：
2012
影响因子：
2.5
通讯作者：
E. D’Alessandro
中科院分区：
文献类型：
--
作者：
S. Sponaugle;Claire B Paris;K. Walter;V. Kourafalou;E. D’Alessandro
大多数海洋生物的二分生活史导致底栖种群的补充模式复杂。成体产卵的高度变化、动态海洋流以及常常未知的幼体行为，给准确预测远洋幼体向近岸幼体栖息地的供应和定居的空间和时间模式带来了挑战。然而，理解和预测幼虫交换是种群动态、生态相互作用和保护实践的基础。我们将观察到的双色雀鲷 Stegastespartitus (Pomacentridae) 沿美国佛罗里达群岛的幼虫定居模式与使用高分辨率生物物理模型通过模型模拟获得的模式进行比较，该模型以物种特定的早期生活史信息为参数。光诱捕器拦截了定居阶段的幼虫，潜水员在 6 个定居高峰期在上岛（东部）（UK）和下岛（西部）（LK）的 2 个复制珊瑚礁中对新招募的幼虫进行了普查。 LK 的雀鲷定居点和招募人数始终超过英国。值得注意的是，模型模拟成功解释了每个区域内 70% 的沉降时间变化。然而，该模型没有捕捉到各地区之间观测到的沉降的相对程度：英国的沉降要么被高估，要么伦敦的沉降被低估。潜在原因包括幼虫定居线索较弱或幼虫导航和游动到英国定居栖息地的能力、幼虫在LK生产力更高的水域中的状况和存活率较高，或者繁殖产量的巨大空间差异。连通性矩阵表明，佛罗里达群岛的大部分 S.partitus 定居点都来自群岛种群。
The bipartite life history of most marine organisms leads to complex patterns of replenishment in benthic populations. High variation in adult spawning, dynamic oceanographic currents, and often unknown larval behaviors create challenges in accurately predicting spatial and temporal patterns in the supply and settlement of pelagic larvae to nearshore juvenile habi- tats. Yet, understanding and predicting larval exchange underlies population dynamics, ecologi- cal interactions, and conservation practices. We compared observed patterns of larval settlement of the bicolor damselfish Stegastes partitus (Pomacentridae) along the Florida Keys, USA, to those obtained through model simulations using a high-resolution biophysical model parameterized with species-specific early life-history information. Light traps intercepted settlement-stage lar- vae, and divers censused new recruits at 2 replicate reefs in each of the upper (eastern) (UK) and lower (western) Keys (LK) during 6 peak settlement periods. Damselfish settlement and recruit- ment to the LK consistently exceeded that to the UK. Remarkably, model simulations successfully explained 70% of temporal variation in settlement within each region. However, the model did not capture the relative magnitude of observed settlement between the regions: settlement was either overestimated in the UK or underestimated in the LK. Potential causes include weak larval settle- ment cues or larval ability to navigate and swim to settlement habitat in the UK, higher larval con- dition and survival in the more productive waters of the LK, or substantial spatial variation in reproductive output. Connectivity matrices indicate that a majority of S. partitus settlement to the Florida Keys is sourced from Keys populations.