Ontogenetic and temperature-dependent changes in tolerance to hypoxia and hydrogen sulfide during the early life stages of the Manila clam Ruditapes philippinarum
| Autor: | Mitsuyasu Waku, Toshihiro Horiguchi, Keita Kodama, Dai Miyawaki, Ryota Sone, Toshiro Ishida, Tetsuji Akatsuka |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
animal structures Artificial fertilization Ontogeny Population Zoology Ruditapes 010501 environmental sciences Aquatic Science Oceanography 01 natural sciences Animals Hydrogen Sulfide Hypoxia education 0105 earth and related environmental sciences Larva education.field_of_study biology 010604 marine biology & hydrobiology Temperature Hypoxia (environmental) General Medicine Eutrophication equipment and supplies biology.organism_classification Bivalvia Adaptation Physiological Pollution |
| Zdroj: | Marine Environmental Research. 137:177-187 |
| ISSN: | 0141-1136 |
| Popis: | Wind-induced upwelling of hypoxic waters containing hydrogen sulfide (H2S) sometimes causes mass mortalities of aquatic organisms inhabiting coastal areas, including the hypoxia-tolerant Manila clam Ruditapes philippinarum. We examined the tolerance of Manila clam to H2S under controlled laboratory conditions. Larvae and juveniles obtained by artificial fertilization or from a wild population were exposed to normoxic or to hypoxic water with or without un-ionized H2S (concentrations, 0.2-52.2 mg/L). Twenty-four-hour exposure experiments revealed ontogenetic changes in the clam's tolerance to H2S exposure: tolerance was enhanced from the larval stages to juveniles just after settlement but was attenuated as juveniles grew. Tolerance of larvae and juveniles to H2S exposure weakened as the water temperature rose from 20 to 28 °C. Prolonged 48-h exposure to H2S attenuated the tolerance of juveniles to H2S. Temporary suspension of H2S exposure by 24-h reoxygenation improved the ability of juveniles to withstand repeated H2S exposure. |
| Databáze: | OpenAIRE |
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