Divergent Effects of Ocean Warming on Byssal Attachment in Two Congener Mussel Species
Divergent Effects of Ocean Warming on Byssal Attachment in Two Congener Mussel Species
复制标题
海洋变暖对两种同类贻贝物种足底附着的不同影响
DOI：
10.1093/icb/icac111
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发表时间：
2022
影响因子：
2.6
通讯作者：
Carrington, E.
中科院分区：
文献类型：
--
作者：
Newcomb, L. A.;Cannistra, A. F.;Carrington, E.
生物体依赖于它们产生的结构材料的完整性来维持广泛的过程，例如获取食物，抵抗捕食者或承受极端的环境力量。这些生物材料的生产和维护往往受到环境条件的调节，因此可能对适应不断变化的气候产生重要影响。这种生物材料的一个众所周知的例子是贻贝足丝，这是一种胶原蛋白样纤维（深海丝）阵列，将双壳软体动物牢固地拴在海底海洋基质上。足丝的强度直接影响到移位、捕食或竞争的死亡率，并取决于产生的足丝的数量和质量。比较了北美西海岸常见的两种贻贝--紫贻贝（Mytilus trossulus）和紫贻贝（M. galloprovincialis，当暴露在海水温度范围从10至24 ° C在实验室。结果表明，在≤ 18 ° C的海水中，两种藻的附着力相当，但在M. trossulus和M. galloprovincialis，导致两个物种之间的总足丝强度相差2 - 10倍。使用这个阈值（18 ° C），我们根据海洋表面温度的年度模式绘制了北美西海岸沿着每个物种的栖息地。估计的范围是一致的，目前的分布，这两个物种，并提出了一个潜在的机制，海洋变暖可能会促进北方扩张ofM。galloprovincialisanddisplacementofnativeM. trossuluspopulations.
Organisms rely on the integrity of the structural materials they produce to maintain a broad range of processes, such as acquiring food, resisting predators, or withstanding extreme environmental forces. The production and maintenance of these biomaterials, which are often modulated by environmental conditions, can therefore have important consequences for fitness in changing climates. One well-known example of such a biomaterial is mussel byssus, an array of collagen-like fibers (byssal threads) that tethers a bivalve mollusk securely to benthic marine substrates. Byssus strength directly influences mortality from dislodgement, predation, or competition and depends on the quantity and quality of byssal threads produced. We compared the temperature sensitivity of byssal attachment strength of two mussel species common to the west coast of North America,Mytilus trossulusandM. galloprovincialis, when exposed to seawater temperatures ranging from 10 to 24°C in the laboratory. We found that the two species attached equally strong in seawater ≤18°C, but higher temperatures caused byssal thread production rate and quality (break force and extensibility) to be greatly reduced inM. trossulusand increased inM. galloprovincialis, leading to a 2–10-fold difference in overall byssus strength between the two species. Using this threshold value (18°C), we mapped habitat for each species along the west coast of North America based on annual patterns in sea surface temperature. Estimated ranges are consistent with the current distribution of the two species and suggest a potential mechanism by which ocean warming could facilitate the northern expansion ofM. galloprovincialisand displacement of nativeM. trossuluspopulations.