Dumbauld Brett R, McCoy Lee M, DeWitt Theodore H, Chapman John W
Agricultural Research Service, U.S. Dept. of Agriculture, Hatfield Marine Science Center, Newport, OR 97365, USA.
United States Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Western Ecology Division, Newport, OR 97365.
Hydrobiologia. 2021 Feb 15;848(5):993-1013. doi: 10.1007/s10750-021-04544-7.
Temporal variation in the density and distribution of the burrowing shrimps, and , were compared in two estuaries along the West coast of the United States (USA) where they are recognized as important ecosystem engineers. Since these shrimp construct deep burrows in the sediment, we quantified the relationship between burrow openings and shrimp density (1.5 and 1.7 burrow openings per shrimp for and respectively) to permit population abundance estimates to be made over broad landscape scales. populations estimated from burrow counts collected using a gridded survey design across representative tide flats declined by 25% between 2008-2010 in Yaquina Bay, Oregon and by 67% in Willapa Bay, Washington from 2006-2011, but increased again in Willapa Bay by 2014. had mostly disappeared from Willapa Bay by 2006 and declines were observed in Yaquina Bay, but the magnitude and long-term trajectory of in this estuary was less clear. These species population fluctuations mirrored those observed in density collected at discrete sampling locations over the same period, equate to large changes in secondary production, and have likely resulted in substantial changes to estuarine habitat and food webs.
在美国西海岸的两个河口，对穴居虾类和的密度及分布的时间变化进行了比较，它们在当地被视为重要的生态系统工程师。由于这些虾会在沉积物中挖掘深洞，我们量化了洞穴开口与虾密度之间的关系（和每只虾分别有1.5个和1.7个洞穴开口），以便在广阔的景观尺度上估算种群数量。通过在代表性潮滩上采用网格化调查设计收集洞穴数量估算出的种群数量，在2008 - 2010年间，俄勒冈州亚奎纳湾下降了25%，在华盛顿州威拉帕湾，2006 - 2011年间下降了67%，但到2014年威拉帕湾又再次上升。到2006年，在威拉帕湾基本消失，在亚奎纳湾也观察到了数量下降，但该河口数量变化的幅度和长期趋势尚不清楚。这些物种的种群波动与同期在离散采样地点观测到的密度波动情况相似，这相当于次级生产力的巨大变化，并且很可能导致河口栖息地和食物网发生了重大改变。
