Controls on range shifts of coastal Californian bivalves during the peak of the last interglacial and baseline predictions for today
Controls on range shifts of coastal Californian bivalves during the peak of the last interglacial and baseline predictions for today
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上次间冰期高峰期间加利福尼亚沿海双壳类动物范围变化的控制和今天的基线预测
DOI：
10.1017/pab.2020.43
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发表时间：
2021
期刊：
影响因子：
2.7
通讯作者：
Finnegan, Seth
中科院分区：
文献类型：
--
作者：
Orzechowski, Emily A.;Finnegan, Seth
作为地球历史上全球气温比现在更高的最近一次，末次间冰期的峰值（海洋同位素子阶段[MIS] 5e;约12万年前）可以作为人类活动前的基线，为不久的未来世界提供温暖。在这里，我们使用了一个新的编译22化石地点在加州已可靠地追溯到MIS 5e建立基线预期当代双壳类物种运动的识别和分析双壳类物种的“extralimital”范围，即物种，占据了加州地区MIS 5e，但现在仅限于邻近地区。我们发现，在MIS 5 e地区发现的15%的物种（n = 142）具有界外分布范围，目前分布在加州地区南部的温暖沃茨水域。大多数发生在古海湾，这表明这些庇护的栖息地更适合暖水物种比暴露的海岸在MIS 5e的栖息地。我们进一步发现，extralimital物种现在往往出现在凉爽，更季节性生产的沿海沃茨，并占据更多的近海岛屿相比，更广泛的物种池立即南部的加州。这些研究结果表明，高分散的潜力和预先存在的环境条件类似的耐受性加州的相对凉爽和季节性生产环境可能使extralimital双壳类移民的加州地区在MIS 5E。
As the most recent time in Earth history when global temperatures were warmer than at present, the peak of the last interglacial (Marine Isotope Substage [MIS] 5e; ~120,000 years ago) can serve as a pre-anthropogenic baseline for a warmer near-future world. Here we use a new compilation of 22 fossil localities in California that have been reliably dated to MIS 5e to establish baseline expectations for contemporary bivalve species movements by identifying and analyzing bivalve species with “extralimital” ranges, that is, species that occupied the California region during MIS 5e but are now restricted to adjacent regions. We find that 15% of species (n = 142) found in MIS 5e localities have extralimital ranges and currently occupy warmer waters to the south of the California region. The majority of extralimital occurrences occur in paleo-embayments, suggesting that these sheltered habitats were more suitable habitats for warm-water species than exposed coasts during the MIS 5e. We further find that extralimital species now tend to occur in cooler, more seasonally productive coastal waters and to occupy more offshore islands when compared with the broader species pool immediately south of California. These findings suggest that high dispersal potential and preexisting tolerances to environmental conditions similar to California's comparatively cool and seasonally productive environments may have enabled extralimital bivalves to colonize the California region during MIS 5e.
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