Survival time of juvenile pen shell Atrina pectinata (Bivalvia: Pinnidae) in hyposaline water
Survival time of juvenile pen shell Atrina pectinata (Bivalvia: Pinnidae) in hyposaline water
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幼年笔壳 Atrina pectinata（双壳纲：Pinidae）在低盐度水中的存活时间
DOI：
10.1007/s40071-017-0183-0
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发表时间：
2018
影响因子：
1.3
通讯作者：
Kanematsu M
中科院分区：
文献类型：
--
作者：
Kurihara T;Nakano S;Matsuyama Y;Hashimoto K;Yamada K;Ito A;Kanematsu M
通过室内实验，研究了栉孔扇贝（Atrinapectinata）幼贝（壳长约34 mm）在低盐度无沉积物水体中的存活时间。将双壳贝类单独饲养在饲养杯中，其中盐度逐渐降低（在1-11小时内从0到约12个盐度范围）。34 ppt）或在12和24 °C下快速（直接至21盐度）。当环境盐度逐渐降低时，两种贝类的存活时间差异显著：24 °C时，盐度≤ 18.6 ppt（一般存活时间< 20 h）与≥ 21.1 ppt（> 83 h）; 12 °C时，盐度≤ 15.1 ppt（< 34 h）与≥ 17.2 ppt（> 83 h）。当环境盐度迅速降低时，双壳贝类的存活时间也有显著差异：24 °C时盐度≤ 15.9 ppt（一般< 20 h）与≥ 17.7 ppt（> 140 h）; 12 °C时盐度≤ 21.3 ppt（一般< 38 h）与≥ 22.3 ppt（> 140 h）。由于盐度降低，生存时间急剧减少，导致选定的统计模型，假设根据盐度降低，危险（瞬时死亡率）急剧指数增加或逐步上升。这些数据和模型表明，juvenileA.在< 21 ppt for periods >无沉积物的环境中，果胶不能在盐度下保存1天。
Survival time of juvenile pen shellAtrina pectinata(shell length ≈ 34 mm) exposed to hyposaline water without sediments was investigated in laboratory experiments. The bivalves were individually maintained in rearing cups in which salinity was decreased either gradually (over 1–11 h to 12 salinities ranging from 0 to ca. 34 ppt) or rapidly (directly to 21 salinities) at 12 and 24 °C. When the environmental salinity was gradually decreased, survival time differed markedly between the bivalves exposed to: salinities ≤ 18.6 ppt (survival time < 20 h in general) vs. ≥ 21.1 ppt (> 83 h) at 24 °C; and between salinities ≤ 15.1 ppt (< 34 h) vs. ≥ 17.2 ppt (> 83 h) at 12 °C. When the environmental salinity was rapidly decreased, survival time, again, differed markedly between the bivalves exposed to: salinities ≤ 15.9 ppt (< 20 h in general) vs. ≥ 17.7 ppt (> 140 h) at 24 °C; and salinities ≤ 21.3 ppt (< 38 h in general) vs. ≥ 22.3 ppt (> 140 h) at 12 °C. Such sharp decreases in survival time due to reduced salinity led to the selected, statistical models that assume either a sharp exponential increase or stepwise hike in hazard (instantaneous mortality rate) according to salinity reduction. These data and models indicate that juvenileA. pectinatashould not be kept at salinities < 21 ppt for periods > 1 day in environments without sediments.