Changes in abundance and biomass of the bivalve Macoma calcarea in the northern Bering Sea and the southeastern Chukchi Sea from 1998 to 2014, tracked through dynamic factor analysis models
Changes in abundance and biomass of the bivalve Macoma calcarea in the northern Bering Sea and the southeastern Chukchi Sea from 1998 to 2014, tracked through dynamic factor analysis models
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DOI：
10.1016/j.dsr2.2018.10.007
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发表时间：
2019-04-01
影响因子：
3
通讯作者：
Cooper, Lee W.
中科院分区：
文献类型：
--
作者：
Goethel, Christina L.;Grebmeier, Jacqueline M.;Cooper, Lee W.
作为分布式生物观测站（DBO）采样工作的一部分，我们在白令海北部和楚科奇海的11个站点使用动态因子分析（DFA）跟踪了一种常见双壳类动物Macoma calcarea的丰度（number m(-2)）和生物量（g C m(-2)）的潜在趋势。其中5个台站位于白令海北部（DBO1 - SLIP台站），另外6个台站位于楚科奇海东南部（DBO3 - UTN站）。作为25年以上底栖生物群落数据的一部分，对1998 - 2014年的M. calcalarea丰度和生物量进行了分析。DFA结果表明，DBO1地区钙区乳杆菌的丰度随站点位置的不同呈现出一增一减的趋势。该地区钙毛霉的生物量数据也显示出随地点不同而同时增加和减少的趋势。在DBO3区，钙毛霉的丰度随位置的不同也有增加和减少的趋势。此外，DBO3区域生物量数据的DFA表明，M. calcarea生物量在各站点之间存在3种潜在趋势（1种趋势是增加的，2种趋势是先减少后增加的，3种趋势是相对稳定的）。模型结果表明，某些表层沉积物特征（叶绿素-a库存量、总有机碳和>= 5 φ粒径百分比）以及底水温与这两个区域钙绿僵菌的丰度和生物量相关。总体而言，我们认为DBO1区域钙钙藻丰度和生物量呈下降趋势，且具有一定的空间复杂性，主要表现为钙钙藻丰度向北移动。由于该地区是世界上濒危的潜水海鸭——眼镜绒鸭（Somarteria fischeri）的重要冬季觅食栖息地，因此猎物数量的减少和向北转移对该物种的管理具有潜在的重要意义。相比之下，DBO3地区的钙区分枝杆菌丰度从UTN5站向UTN2站向南移动，表明水文对沉积物组成和食物供应的影响可能是该物种的关键驱动因素。
We used dynamic factor analysis (DFA) to track underlying trends in the abundance (number m(-2)) and biomass (g C m(-2)) of a common bivalve, Macoma calcarea, at eleven stations in the northern Bering and Chukchi Seas, as part of the Distributed Biological Observatory (DBO) sampling effort. Five of the stations are located in the northern Bering Sea (DBO1 - SLIP stations) and the other six stations are located in the southeastern Chukchi Sea (DBO3 - UTN stations). M. calcarea abundance and biomass were analyzed from 1998 to 2014 as part of a 25 + year benthic community dataset. Results from the DFA indicate that there are two abundance trends (one increasing and one decreasing, depending on station location) for M. calcarea in the DBO1 region. Biomass data for M. calcarea in this region also indicates simultaneous increasing and decreasing trends, depending on location. In the DBO3 region, there are also both increasing and decreasing abundance trends for M. calcarea depending on location. Furthermore, DFA of biomass data in the DBO3 region indicates that M. calcarea biomass has three underlying trends among stations (one increasing, a second trend that decreases and then increases, and third that is relatively stable through time). Model results indicate that certain surface sediment characteristics (chlorophyll-a inventories, total organic carbon, and percent >= 5 phi grain size) as well as bottom water temperature are correlated with abundance and biomass of M. calcarea in these two regions. Overall, we conclude that M. calcarea abundance and biomass declined in the DBO1 region, with some spatial complexities, which is apparent principally as a northward shift of M. calcarea abundance. Since this area is a critical winter foraging habitat for the world population of a threatened diving sea duck, the spectacled eider (Somarteria fischeri), the decline and northward shift in prey is potentially significant for management of the species. By comparison, abundance of M. calcarea in the DBO3 region exhibited a southward shift in abundance away from station UTN5 and towards UTN2, suggesting that hydrographic influences on sediment composition and food supply may be key drivers for this species.