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标题：Survival time of juvenile pen shell Atrina pectinata (Bivalvia: Pinnidae) in hyposaline water
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作者：Takeo Kurihara ; Shoji Nakano ; Yukihiko Matsuyama 等
期刊名称：International Aquatic Research
印刷版ISSN：2008-6970
出版年度：2018
卷号：10
期号：1
页码：1-11
DOI：10.1007/s40071-017-0183-0
语种：English
出版社：BioMed Central
摘要：Survival time of juvenile pen shell Atrina 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 juvenile A. pectinata should not be kept at salinities < 21 ppt for periods > 1 day in environments without sediments.
关键词：Pen shell ; Atrina pectinata Lineage 2 ; Survival analysis ; Low salinity ; Gradual and rapid decreases ; Temperature