Larval dispersal of intertidal organisms and the influence of coastline geography
Larval dispersal of intertidal organisms and the influence of coastline geography
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DOI：
10.1111/j.1600-0587.2013.00259.x
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发表时间：
2013-04
期刊：
影响因子：
5.9
通讯作者：
T. Adams;D. Aleynik;M. Burrows
中科院分区：
文献类型：
--
作者：
T. Adams;D. Aleynik;M. Burrows
具有无柄成体的生物体的扩散阶段必须能够选择具有适合建立和生存的环境条件的栖息地，并且还必须能够到达这些地点。对于海洋浮游幼虫来说，由水流引起的运动通常比由游泳行为引起的运动大几个数量级。当前的模式是由基础地理和潮汐力之间的相互作用决定的，并受气象条件的影响。这些联系将特定领域的重点放在连通性研究上。然而，地理特征和气象强迫如何结合起来产生特定的当前模式以及由此产生的人群之间的联系仍不清楚。在这项对复杂峡湾地区（苏格兰洛恩湾）的研究中，我们跟踪了由模拟水动力流驱动的通用粒子的轨迹，以研究均匀分布的栖息地之间的连通性如何随海岸地形而变化。我们研究了一系列幼虫持续时间（1-28 天）和两种不同但典型的气象强迫情景。从高流速、开放的海岸线和低当地栖息地可用性的区域释放的颗粒传播最远，但不太可能成功地分散到其他沿海地点。地点附近广泛的出生栖息地通常会对到达的粒子数量产生积极影响，低流速也是如此。然而，到达的颗粒数量与当地地理指数之间的关系很复杂，特别是在幼虫持续时间较长的情况下。仅当地地理就可以解释高达 50% 的颗粒释放成功率差异以及接近 10% 的到达每个地点的颗粒数量差异。一般模式是显而易见的，但海岸线特性无法预测特定地点的扩散措施。研究表明，气象变化和大范围的洋流模式与当地地理相互作用，决定了沿海地区的连通性。
The dispersal stages of organisms with sessile adults must be able to select habitats with suitable environmental conditions for establishment and survival, and also must be able to reach those locations. For marine planktonic larvae, movement due to currents is often orders of magnitude greater than movement due to swimming behaviour. Current patterns are determined by interactions between underlying geography and tidal forces, modified by meteorological conditions. These linkages impose an area-specific focus to connectivity studies. Yet, how geographical features and meteorological forcing combine to produce specific current patterns and resultant connectivity among populations remains unclear. In this study of a complex fjordic region (the Firth of Lorn, Scotland), we followed tracks of generic particles driven by modelled hydrodynamic currents to investigate how connectivity between evenly spaced habitat sites varies in relation to coastal topography. We studied a range of larval durations (1–28 d), and two different but typical meteorological forcing scenarios. Particles released from regions of high current velocity, open coastline and low local habitat availability travelled furthest but were less likely to disperse successfully to other coastal sites. Extensive natal habitat in the vicinity of a site generally had a positive impact on the number of arriving particles, as did low current velocities. However, relationships between numbers of arriving particles and local geographical indices were complex, particularly at longer larval durations. Local geography alone explained up to 50% of the variance in success of particles released and closer to 10% of the variation in the number of particles arriving at each site. General patterns are evident, but coastline properties fall short of predicting dispersal measures for particular locations. The study shows that meteorological variation and broad scale current patterns interact strongly with local geography to determine connectivity in coastal areas.