Ecophenotypy, temporal and spatial fidelity, functional morphology, and physiological trade-offs among intertidal bivalves
Ecophenotypy, temporal and spatial fidelity, functional morphology, and physiological trade-offs among intertidal bivalves
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DOI：
10.1017/pab.2018.14
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发表时间：
2018-05
期刊：
影响因子：
2.7
通讯作者：
J. Huntley;J. Schiffbauer;Teresa D. Avila;Jesse S. Broce
中科院分区：
文献类型：
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作者：
J. Huntley;J. Schiffbauer;Teresa D. Avila;Jesse S. Broce
抽象。种群生态表型变异是由环境变量的差异驱动的。在海洋环境中，生态表型变异可能由水动力条件、基质类型、水深、温度、盐度、氧浓度和生境异质性等方面的差异引起。现代和化石环境中的生态表型变异的重叠是常见的，但时间平均和空间平均对它们的保存的影响知之甚少。在这里，我们研究了两个相邻的人口，活的收集和死亡的组合，底栖动物，悬浮喂养，潮间带双壳类Leukoma stamadium从研究充分的阿盖尔溪和阿盖尔泻湖位置的圣胡安岛，华盛顿的壳形态。在低能量的泻湖中的个体可以自由地在细粒基质中挖洞，而在高能量的小溪中的蛤蜊则不能在岩石通道中挖洞。我们的研究结果表明，在相邻的栖息地之间的大小和形状的变化。泻湖蛤更大，更盘形，并有相对较大的虹吸管比他们的小溪同行，这是较小的，更球形的形状，并有一个相对较浅的套窦。这种生态表型保存在死亡组合，虽然一般更大的变化，由于时间平均和壳运输。我们的解释是，生态表型的变化，在这种情况下，是由不同的水动力机制和基板类型，累积导致生理权衡转移资源从喂养和呼吸的稳定性和壳强度，所有这些都有可能被保存在化石记录。
Abstract. Ecophenotypic variation in populations is driven by differences in environmental variables. In marine environments, ecophenotypic variation may be caused by differences in hydrodynamic conditions, substrate type, water depth, temperature, salinity, oxygen concentration, and habitat heterogeneity, among others. Instances of ecophenotypic variation in modern and fossil settings are common, but little is known about the influences of time averaging and spatial averaging on their preservation. Here we examine the shell morphology of two adjacent populations, both live collected and death assemblages, of the infaunal, suspension-feeding, intertidal bivalve Leukoma staminea from the well-studied Argyle Creek and Argyle Lagoon locations on San Juan Island, Washington. Individuals in the low-energy lagoon are free to burrow in the fine-grained substrate, while clams in the high-energy creek are precluded from burrowing in the rocky channel. Our results demonstrate variation in size and shape between the adjacent habitats. Lagoon clams are larger, more disk-shaped, and have relatively larger siphons than their creek counterparts, which are smaller, more spherical in shape, and have a relatively shallower pallial sinus. This ecophenotypy is preserved among death assemblages, although with generally greater variation due to time averaging and shell transport. Our interpretation is that ecophenotypic variation, in this case, is induced by differing hydrodynamic regimes and substrate types, cumulatively resulting in physiological trade-offs diverting resources from feeding and respiration to stability and shell strength, all of which have the potential to be preserved in the fossil record.