Quantifying estuarine‐scale invertebrate larval connectivity: Methodological and ecological insights

Quantifying estuarine‐scale invertebrate larval connectivity: Methodological and ecological insights
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量化河口规模无脊椎动物幼虫的连通性:方法论和生态见解

DOI:
10.1002/lno.10819
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发表时间:
2018
影响因子:
4.5
通讯作者:
Fodrie, F. Joel
Fodrie, F. Joel
中科院分区:
地球科学1区
文献类型:
--
作者:
Kroll, Ian R.;Poray, Abigail K.;Puckett, Brandon J.;Eggleston, David B.;Fodrie, F. Joel

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许多海洋生物的早期生活史包括一个分散的浮游幼虫阶段,这使得亚种群之间的个体交换成为可能。了解交流或连通程度对于了解海洋种群的丰度和分布至关重要。在这里,我们应用地球化学标记,以评估河口规模的幼虫之间的商业和生态上重要的东部牡蛎,Crassostrea virginica.To生成一个“地图集”的地球化学特征与产卵场和潜在的传播途径,从产卵场,我们最近产卵的牡蛎幼虫外植到固定的停泊处和表面漂流物,分别亚种群之间的连接。使用这两种方法产生的地图集,我们预测了纳塔尔起源,从而幼虫连接,在三个领域的试验超过两个夏天的新定居牡蛎(spat(2013年6月、2014年6月和2014年8月),三个区域内(约35公里× 15公里象限)的帕姆利科湾,北卡罗来纳州,美国幼虫连接模式各不相同,每月和每年,但主要是针对南向北以下风的模式。预测的自我募集是可变的,因为给定区域中高达100%的贝苗显示出与同一区域内纳塔尔起源一致的特征。预测的连接模式变化显着的基础上生成的地图集从固定系泊与表面漂移。例如,漂流者预测的连通性比系泊预测的连通性更接近生物物理幼虫扩散模型,而系泊预测的连通性显示出幼虫来源的更高多样性。这两个连接模型强调需要资源管理战略,如储备网络,以纳入设计,占固有的变异性扩散途径。
The early life history of many marine organisms includes a dispersive planktonic larval phase which allows for the exchange of individuals among subpopulations. Knowledge of the degree of exchange, or connectivity, is critical to understanding the abundance and distribution of marine populations. Here, we applied geochemical tagging to assess estuarine‐scale larval connectivity among subpopulations of the commercially and ecologically important eastern oyster,Crassostrea virginica.To generate an “atlas” of geochemical signatures associated with spawning sites and potential dispersal pathways from spawning sites, we outplanted recently spawned oyster larvae to stationary moorings and surface drifters, respectively. Using the atlases generated from both outplant methods, we predicted natal origin, and thus larval connectivity, for newly settled oysters (spat) during three field trials over two summers (June 2013, June 2014, and August 2014), within three regions (∼ 35 km × 15 km quadrants) of Pamlico Sound, North Carolina, U.S.A. Patterns of larval connectivity varied both between months and annually but were predominately directed south to north following wind patterns. Predicted self‐recruitment was variable, as up to 100% of spat in a given region displayed signatures consistent with natal origin within that same region. Predicted connectivity patterns varied significantly based on atlases generated from outplanting on stationary moorings vs. surface drifters. For example, drifter‐predicted connectivity followed biophysical larval dispersal models more closely than mooring‐predicted connectivity, while mooring‐predicted connectivity displayed a higher diversity in larval sources. Both connectivity models highlight the need for resource management strategies such as reserve networks to incorporate designs that account for inherent variability in dispersal pathways.
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