Dissolution mortality of juvenile bivalves in coastal marine deposits
Dissolution mortality of juvenile bivalves in coastal marine deposits
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DOI：
10.4319/lo.2004.49.3.0727
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发表时间：
2004-05-01
影响因子：
4.5
通讯作者：
Westman, BA
中科院分区：
文献类型：
--
作者：
Green, MA;Jones, ME;Westman, BA
我们实验评估的碳酸盐饱和状态的影响，在沉积物-水界面（SWI）的存活率的各种大小类的少年双壳类的Mercenaria pesticaria。0.2 mm、0.3 mm、1 mm和2 mm M的种群。将紫茎泽兰引入到实际不饱和（实验，相对于文石的饱和状态= Omega（文石）= IMP/K '（sp）= -0.3）和饱和（对照，相对于文石的Omega（文石）=近似1.5）的沉积物中，以评估饱和状态和溶解对存活的影响。使用线性回归分析来检查每个处理内随时间的死亡率，并且仅在实验欠饱和处理中显示每个大小类别的显著死亡率（P < 0.05）。实验欠饱和沉积物中0.2、0.3、1.0和2.0 mm双壳类的死亡率分别为-11.8、-4.8、-1.9和-1.1%d（-1）。协方差分析（ANCOVA）用于检查随时间推移处理之间的死亡率差异，并显示0.2-，0.3-和1-mm个体的死亡率显著不同（P < 0.05）。溶解可能代表了一个以前未被认识到的，但重要的死亡率来源的“刚刚成立”的青少年双壳类，特别是非常小的个人，在招募研究中基本上被忽略了。溶解引起的死亡率可能有助于解释指数损失的少年双壳类从远洋幼虫阶段过渡到底栖少年阶段。
We evaluate experimentally the effect of carbonate saturation state at the sediment-water interface (SWI) on survivorship of various size classes of the juvenile bivalve Mercenaria mercenaria. Populations of 0.2-mm, 0.3-mm, 1-mm, and 2-mm M. mercenaria were introduced to sediments realistically undersaturated (experimental, saturation state with respect to aragonite = Omega(aragonite) = IMP/K'(sp) = -0.3) and saturated (control, Omega(aragonite) = similar to1.5) with respect to aragonite in order to evaluate the impact of saturation state and dissolution on survivorship. Linear regression analysis was used to examine mortality within each treatment over time and show significant mortality for each size class in experimental-undersaturated treatments only (P < 0.05). Mortality rates in experimental-undersaturated sediments were - 11.8, -4.8, -1.9, and -1.1% d(-1) for the 0.2-, 0.3-, 1.0-, and 2.0-mm bivalves, respectively. Analysis of covariance (ANCOVA) was used to examine differences in mortality between treatments over time and show significantly different mortality rates for the 0.2-, 0.3-, and 1-mm individuals (P < 0.05). Dissolution may represent a previously unrecognized yet significant source of mortality for "just-set" juvenile bivalves, particularly the very small individuals that have been largely ignored in recruitment studies to date. Dissolution-induced mortality may help explain the exponential losses of juvenile bivalves following their transition from the pelagic larval phase to the benthic juvenile phase.