Influence of Environmental Conditions on Mytilus trossulus Size Frequency Distributions in Two Glacially Influenced Estuaries
Influence of Environmental Conditions on Mytilus trossulus Size Frequency Distributions in Two Glacially Influenced Estuaries
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两个受冰川影响的河口环境条件对松贻贝大小频率分布的影响
DOI：
10.1007/s12237-023-01175-0
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发表时间：
2023
影响因子：
2.7
通讯作者：
Iken, Katrin
中科院分区：
文献类型：
--
作者：
LaBarre, Amy;Konar, Brenda;Iken, Katrin
太平洋蓝贻贝(Mytilus Trossulus)是高纬度潮间带和河口系统的基础物种，它创造复杂的生境，提供沉积物稳定性，是顶级捕食者的食物，并将水柱和底栖生物联系起来。栖息在高纬度河口的贻贝从积雪和冰川补给的河流中获得淡水径流，或者受到海洋的影响。这些水文条件与当地静态环境特征，如底物类型、渔获物、海滩坡度、到淡水的距离和冰川流量共同作用，影响贻贝的种群。2019年和2020年，从阿拉斯加湾的两个生态区采集了贻贝，以确定贻贝大小频率是否在空间(当地和生态区域)和水文尺度上变化，以及任何静态环境特征是否与这种变化相关。这项研究表明，根据采集的生态区域和年份，具有相似水文条件的地点的贻贝大小频率最接近。水文条件解释了这两年合并生态区贻贝大小频率变化的大约43%。新招募的贻贝(0-2 mm)在捕获量较高的地点较多，而大型贻贝(>； 20 mm)在较受保护的地点较多。获取和淡水影响解释了两年和两个生态区域贻贝大小频率变化的主要原因，底物和坡度在2019年也很重要，冰川影响在2020年也很重要。这项研究表明，水文和静态环境条件可能在贻贝大小的结构中发挥重要作用。尽管贻贝大小频率的差异取决于环境条件，但贻贝大小在不同类型的淡水影响下表现出很小的差异，因此它们可能对与冰川融化相关的变化具有弹性。
The Pacific blue mussel (Mytilus trossulus) is a foundation species in high-latitude intertidal and estuarine systems that creates complex habitats, provides sediment stability, is food for top predators, and links the water column and the benthos.M. trossulusalso makes an ideal model species to assess biological responses to environmental variability; specifically, its size frequency distributions can be influenced by the environment in which it lives. Mussels that inhabit estuaries in high latitudes receive freshwater runoff from snow and glacial-fed rivers or can be under oceanic influence. These hydrographic conditions work together with local static environmental characteristics, such as substrate type, fetch, beach slope, distance to freshwater, and glacial discharge to influence mussel demographics. In 2019 and 2020, mussels were collected from two Gulf of Alaska ecoregions to determine whether mussel size frequencies change over spatial (local and ecoregional) and hydrographic scales and whether any static environmental characteristics correlate with this variability. This study demonstrated that mussel size frequencies were most comparable at sites with similar hydrographic conditions, according to the ecoregion and year they were collected. Hydrographic conditions explained approximately 43% of the variation in mussel size frequencies for both years, for the combined ecoregions. Mussel recruits (0–2 mm) were more abundant at sites with higher fetch, while large mussels (> 20 mm) were more abundant at more protected sites. Fetch and freshwater influence explained most of the variation in mussel size frequencies for both years and across both ecoregions, while substrate and slope were also important in 2019 and glacial influence in 2020. This study suggests that hydrographic and static environmental conditions may play an important role in structuring mussel sizes. Although differences in mussel size frequencies were found depending on environmental conditions, mussel sizes showed little difference across differing types of freshwater influence, and so they may be resilient to changes associated with melting glaciers.
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