Intertidal Zonation of the Suminoe Oyster Crassostrea ariakensis and the Kumamoto Oyster Crassostrea sikamea on the Coast of the Northern East China Sea
| Autor: | Xue-Ying Li, Zhao-Yue Sun, Fan Ruiliang, Weimin Quan, Nan-Nan Li, Xiumei Fan, Cheng Qiqun, Wang Taoni |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Oyster geography geography.geographical_feature_category biology Ecology 010604 marine biology & hydrobiology Intertidal zone Estuary 04 agricultural and veterinary sciences Aquatic Science Intertidal ecology 01 natural sciences Ecosystem engineer Habitat biology.animal Crassostrea ariakensis 040102 fisheries 0401 agriculture forestry and fisheries Bay |
| Zdroj: | Journal of Shellfish Research. 39:31 |
| ISSN: | 0730-8000 |
| DOI: | 10.2983/035.039.0104 |
| Popis: | The Suminoe oyster Crassostrea ariakensis and the Kumamoto oyster Crassostrea sikamea coexist and are habitat-forming ecosystem engineers in the Yangtze River estuary and its adjacent coasts. To date, little quantitative information is available on the intertidal zonation patterns of these two oysters within their native range or on the related mechanisms generating these spatial patterns. This study first carried out field surveys and laboratory experiments to explore the vertical zonation patterns of the two oysters in the intertidal habitats of northern Hangzhou Bay, assess the roles of abiotic (aerial exposure stress) and biotic (larval distribution, recruitment, and competition) factors in regulating vertical zonation and understand their driving mechanisms. At the study site, C. sikamea dominated the higher intertidal zone (approximately 6.7 h and 56% emersion/12 h tidal cycle), whereas C. ariakensis occupied the three deeper intertidal zones (mid, mid-low, and low intertidal). Mean aerial exposures of 56% and 42% represented the optimal growth zones and the lower limits of C. sikamea, respectively. The growth boundary of the two oysters was located in the intertidal zone that was exposed 42% of the time. The area with the highest C. ariakensis densities (the optimal growth zone) was the mid-low intertidal (mean: 3.0 h and 25% emersion/tidal cycle). In a laboratory 72-h aerial exposure experiment, the percentage of water loss was significantly greater for C. ariakensis than for C. sikamea after 24 h (P 0.05). Twenty-two individuals among the 30 oyster recruits (73%) in the high intertidal region were identified as C. sikamea, and six recruits (20%) were identified as C. ariakensis. All 36 recruits (100%) in the low intertidal region were identified as C. ariakensis. It was concluded that the differential larval distribution, settlement, and post-settlement mortality along the intertidal elevation gradients served as a mechanism for vertical zonation of these two oyster species. |
| Databáze: | OpenAIRE |
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