Size Doesn't Matter: Integrative Taxonomy Shows Crepidula adunca and Crepidula norrisiarum Have Overlapping Shell Sizes and Broadly Concordant Distributions.

IF 2.1 4区 生物学 Q2 BIOLOGY Biological Bulletin Pub Date : 2022-06-01 Epub Date: 2022-06-08 DOI:10.1086/720422
M Castelin, R Collin, R Harbo, E Spence, K Aschenbrenner, W Merilees, S R Gilmore, C Abbott, D J Eernisse
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Abstract

AbstractThe calyptraeids Crepidula adunca and Crepidula norrisiarum, both direct developers, are abundant in the shallow waters of the northeastern Pacific. They have long been considered as two allopatric species that live on different hosts and differ in body size. In this study, we rigorously test this historical hypothesis by assessing molecular taxonomy, museum records, new morphological and host observations, and population genetic structure along the northeast Pacific coast. Results show that, contrary to previous understanding, the distributions of the two species largely overlap and that size does not effectively distinguish them, especially in the northern part of the range where the nominal "C. adunca" has been studied. Newly recognized northern occurrences of C. norrisiarum demonstrate that both species have similar, disrupted distributions that range from British Colombia through southern California. Neither species is reported to occur on the outer shores of southern Washington or Oregon, the exception being records of C. adunca at Cape Arago, Oregon. Despite this apparent geographic gap, neither species shows appreciable genetic differentiation between the northern and southern parts of its ranges. Despite body size having been used to distinguish these species, our observations do not support body size as a species-specific trait; rather, they support a new hypothesis that body size variation reflects regional differences in host use and host availability.

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大小无关紧要:综合分类显示,白桦和北桦有重叠的壳大小和广泛一致的分布。
摘要东北太平洋浅海中有大量直接发育的灰尾Crepidula adunca和norrisiarum。长期以来,它们被认为是生活在不同宿主上、体型不同的两种异域物种。在这项研究中,我们通过评估东北太平洋沿岸的分子分类、博物馆记录、新的形态和宿主观察以及种群遗传结构,严格验证了这一历史假设。结果表明,与以往的认识相反,这两个物种的分布在很大程度上重叠,并且大小不能有效地区分它们,特别是在已研究的名义“C. adunca”的范围北部。新近发现的norrisiarum在北部的分布表明,这两个物种从不列颠哥伦比亚到南加州都有相似的分布。据报道,这两个物种都没有出现在华盛顿州南部或俄勒冈州的外海岸,唯一的例外是在俄勒冈州阿拉戈角有记录的C. adunca。尽管存在这种明显的地理差异,但在其分布范围的南北部分,这两个物种都没有表现出明显的遗传差异。尽管体型被用来区分这些物种,但我们的观察结果并不支持体型作为物种特有的特征;相反,他们支持一个新的假设,即身体大小的变化反映了宿主使用和宿主可用性的区域差异。
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来源期刊
Biological Bulletin
Biological Bulletin 生物-海洋与淡水生物学
CiteScore
3.30
自引率
6.20%
发文量
47
审稿时长
6-12 weeks
期刊介绍: The Biological Bulletin disseminates novel scientific results in broadly related fields of biology in keeping with more than 100 years of a tradition of excellence. The Bulletin publishes outstanding original research with an overarching goal of explaining how organisms develop, function, and evolve in their natural environments. To that end, the journal publishes papers in the fields of Neurobiology and Behavior, Physiology and Biomechanics, Ecology and Evolution, Development and Reproduction, Cell Biology, Symbiosis and Systematics. The Bulletin emphasizes basic research on marine model systems but includes articles of an interdisciplinary nature when appropriate.
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