INFLUENCE OF LARVAL DISPERSAL AND GEOGRAPHIC-DISTRIBUTION ON SPECIES LONGEVITY IN NEOGASTROPODS
INFLUENCE OF LARVAL DISPERSAL AND GEOGRAPHIC-DISTRIBUTION ON SPECIES LONGEVITY IN NEOGASTROPODS
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DOI：
10.1017/s0094837300006758
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发表时间：
1980-01-01
期刊：
影响因子：
2.7
通讯作者：
HANSEN, TA
中科院分区：
文献类型：
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作者：
HANSEN, TA
下第三纪墨西哥湾沿岸经历了不同速率和程度的反复海侵-海退循环，这对物种寿命产生了显着影响。在一些新腹足类动物中，扩散和地理分布对物种寿命起着重要作用。即使在三角洲建设强劲的海退阶段，栖息在墨西哥湾沿岸广大地区的具有浮游幼体阶段的物种也可以维持其分布。广泛的分布、自由的基因流动和对隔离的抵抗力使浮游物种具有进化稳定性，从而延长了物种的寿命。当障碍最小化时，具有非浮游发育的物种可以达到广泛的地理范围，但它们在面对退化时无法维持其分布。它们的种群是孤立的，灭绝和物种形成加速，导致它们的进化寿命较短。尽管浮游的卷虫往往分布广泛，但浮游的片形虫和蜈蚣的分布往往受到限制，因此可能是狭窄的。如果将扩散和环境耐受性视为独立的力量，那么它们似乎共同作用，产生非常长、非常短或中间的物种寿命。
The Lower Tertiary Gulf Coast was subjected to repeated transgressive-regressive cycles of varying rate and extent which had a marked effect on species longevities. In some neogastropods dispersal and geographic distribution played important roles in species longevities. Species with planktonic larval stages that inhabited broad areas of the Gulf Coast could maintain their distributions even during regressive phases when delta building was strong. Wide distributions, free gene flow and resistance to isolation gave planktonic species an evolutionary stability that resulted in greater species longevity. Species with nonplanktonic development could attain wide geographic ranges when barriers were minimized, but they were unable to maintain their distributions in the face of regressive progradation. Their populations were isolated, and extinction and speciation accelerated, giving them lesser evolutionary longevity. Although planktonic volutids tend to be widespread, planktonic fasciolariids and mitrids were often restricted in distribution and therefore probably stenotopic. If dispersal and environmental tolerance are considered as separate forces, they seem to act in combination to produce very long, very short or intermediate species longevities.