Spatial and temporal patterns in summer ichthyoplankton assemblages on the eastern Bering Sea shelf 1996-2000
Spatial and temporal patterns in summer ichthyoplankton assemblages on the eastern Bering Sea shelf 1996-2000
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DOI：
10.1111/j.1365-2419.2005.00348.x
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发表时间：
2006-01-01
影响因子：
2.6
通讯作者：
Stabeno, PJ
中科院分区：
文献类型：
--
作者：
Duffy-Anderson, JT;Busby, MS;Stabeno, PJ
1996年至2000年夏季，对东白令海（EBS）大陆架的仔鱼和早期幼鱼进行了采样。从这些收集的数据被用来研究物种组合结构和丰度的空间和时间模式。根据Bray-Curtis相异度系数进行聚类分析，根据相似的丰度和物种组成对物种和站点进行分组。排序技术被用来验证分组，和一个非参数的逐步程序，使用斯皮尔曼相关系数（BIO-ENV）被用来将分组的主要环境变量。这些方法揭示了1996年、1997年、1999年和2000年与测深有关的站群模式，尽管在1998年没有观察到与地理边界的明显关系。1997年和1998年观察到物种关联的重大差异，1997年和1999年之间还注意到许多物种的丰度下降。一个区域性的，完整的原始方程模型被用来模拟浮动轨迹上的EBS货架上，在每年更好地将鱼类分布观测到现行的电流模式。模型结果表明，在几年的流量一般的变化，虽然1998年站出来，更强的东北流比在任何其他年份检查。观察到的中断的幼虫和早期的幼鱼组合可能与1997年至1998年在EBS的强厄尔尼诺事件。如果这一想法得到证实，我们的研究表明，幼鱼和幼鱼对环境扰动敏感，反应相对较快（1-2年），因此，可能是环境变化的及时指标。
Larval and early juvenile fishes were sampled from the eastern Bering Sea (EBS) shelf during summer from 1996 to 2000. Data from these collections were used to examine spatial and temporal patterns in species assemblage structure and abundance. Cluster analyses based on Bray-Curtis dissimilarity coefficients were used to group species and stations according to similar abundance and species composition. Ordination techniques were used to verify groupings, and a non-parametric stepwise procedure using a Spearman correlation coefficient (BIO-ENV) was used to relate groupings to predominant environmental variables. These approaches revealed a pattern of station groupings that were generally related to bathymetry in 1996, 1997, 1999, and 2000, although no obvious relationship to geographic boundaries was observed in 1998. Significant differences in species associations were observed in 1997 and 1998, and depressions in abundance were also noted among many species between 1997 and 1999. A regional, full primitive equation model was used to simulate float trajectories on the EBS shelf in each year to better relate fish distributional observations to prevailing Current patterns. Model results indicated general variations in flow in several years, although 1998 stood out with stronger northeast flow than in any of the other years examined. Observed disruptions of larval and early juvenile fish assemblages could be related to the strong El-Nino event of 1997-98 in the EBS. If this idea is confirmed, our Study suggests that larval and juvenile fish are sensitive and respond relatively quickly (1-2 yr) to environmental perturbations, and as such, may be timely indicators of environmental change.