Demographic patterns of the purple sea urchin Strongylocentrotus purpuratus along a latitudinal gradient, 1985-1987
Demographic patterns of the purple sea urchin Strongylocentrotus purpuratus along a latitudinal gradient, 1985-1987
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DOI：
10.3354/meps08547
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发表时间：
2010-01-01
影响因子：
2.5
通讯作者：
Ebert, Thomas A.
中科院分区：
文献类型：
--
作者：
Ebert, Thomas A.
紫色海胆地理分布的丰富中心模型已经被其他人测试过，他们发现密度和繁殖率最高的地方是在最南端，而不是在范围的中心，因此拒绝了这个模型。问题是大小、生长和生存数据是否会产生其他或相反的结果。1985-1987年，在北纬29.93度至50.47度的北美太平洋沿岸，测量了紫海胆的潮间带密度和大小结构，覆盖了报告地理范围的65%；这些历史数据被用来探索纬度模式。招募是基于个体在尺寸分布的最小模式中的分数。用四环素标记测定生长，用大小分布和生长估计生存。紫海胆的密度在北纬35 ~ 37度之间最高，招募数在北纬34 ~ 38度之间最多，直径在北纬43 ~ 44度之间最大，在北纬34度左右最小。种群特征的模式不符合简单的模型或先前发表的结果。海岸地形和洋流的相互作用被认为是密度和招募的主要决定因素。没有描述地理分布的一般模型可以预测观测到的模式。南部的范围界限最好用热耐受性来解释，北部的范围界限用低温下幼虫的发育时间来解释。
The abundant center model of geographic distribution has been tested for the purple sea urchin by others who found highest densities and reproduction towards the southern end rather than in the center of the range and so rejected the model. A question is whether size, growth, and survival data would yield other or contrary results. Intertidal densities and size structures were measured for purple sea urchins along the Pacific coast of North America during 1985-1987 from 29.93 to 50.47 degrees N, covering about 65% of the reported geographic range; these historical data were used to explore latitudinal patterns. Recruitment was based on the fractions of individuals in the smallest mode of the size distributions. Growth was determined by tagging with tetracycline and survival was estimated using size distributions and growth. Density of purple sea urchins was highest between 35 and 37 degrees N and the samples with the highest numbers of recruits occurred between 34 and 38 degrees N. Maximum diameter was largest at 43 to 44 degrees N and smallest at about 34 degrees N. There was no latitudinal pattern to growth or survival. Patterns of population traits did not fit simple models or previously published results. The interplay of coastal topography and currents are suggested as the primary determinants of density and recruitment. No general models for describing geographic distributions predict the observed patterns. The southern range limit is best explained by thermal tolerance and the northern limit by development times of larvae at low temperatures.