Shell phenotypic variation in the south-western Atlantic gastropod Olivancillaria carcellesi (Mollusca: Olividae)
Shell phenotypic variation in the south-western Atlantic gastropod Olivancillaria carcellesi (Mollusca: Olividae)
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西南大西洋腹足动物 Olivancillaria carcellesi 的壳表型变异（软体动物：Olividae）
DOI：
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发表时间：
2010
影响因子：
1.2
通讯作者：
G. Pastorino
中科院分区：
文献类型：
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作者：
V. Teso;J. Signorelli;G. Pastorino
利用几何形态计量学技术，证实了4个代表性地区橄榄叶壳大小和形状的表型变异。这个物种生活在从巴西的里约热内卢de Janeiro到Punta Pardelas（阿根廷Chubut）的整个潮下软底的整个属范围内。柱状愈伤组织的厚度、长度和宽度是在巴西卡西诺、乌拉圭拉帕洛马和阿根廷马德普拉塔等几个中间地点采集的标本的主要差异。除了来自La Paloma的O. carcellesi外，所有种类的壳大小与来自Mar del Plata的相比都有显著差异。拥有较大标本的小组来自卡西诺。来自Punta Pardelas最南端种群的Olivancillaria carcellesi体型较小，在大小和形状之间表现出异态，这就是它们相对较高的尖顶的原因。讨论了观测到的模式可能的生态意义。证实了紫茎草虽有变异，但却是一个界定明确的种。
Phenotypic variation on shell size and shape of Olivancillaria carcellesi from four representative localities is confirmed using geometric morphometric techniques. This species lives along the entire range of the genus in subtidal soft bottoms from Rio de Janeiro (Brazil) to Punta Pardelas (Chubut, Argentina). Thickness of columellar callus, length and width are the main shell differences from specimens collected at several intermediate localities: Cassino (Brazil), La Paloma (Uruguay) and Mar del Plata (Argentina). All forms showed significant differences in shell size except O. carcellesi from La Paloma compared with those from Mar del Plata. The group with larger specimens was from Cassino. Olivancillaria carcellesi from Punta Pardelas, the southernmost population, was the smaller sized group and showed allometry between size and shape and this is responsible for their relatively higher spires. The possible ecological implications of the observed pattern are discussed. It is confirmed that O. carcellesi although variable, is a clearly defined species.