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題名 | Population Structure and Reproduction of the Mysid Shrimp Acanthomysis thailandica (Crustacea: Mysidae) in a Tropical Mangrove Estuary, Malaysia= |
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作者 | Ramarn, Tueanta; Chong, Ving-ching; Hanamura, Yukio; |
期刊 | Zoological Studies |
出版日期 | 20121100 |
卷期 | 51:6 2012.11[民101.11] |
頁次 | 頁768-782 |
分類號 | 387.1 |
語文 | eng |
關鍵詞 | 甲殼動物; Reproductive biology; Spatial and temporal abundance; Developmental stages; Mudflat area; Crustacea; |
英文摘要 | The mysid shrimp Acanthomysis thailandica Murano, 1988 in the Matang mangrove estuary showed large spatial and temporal variations in population density. Large numbers occurred on the mudflat where the mean salinity was 25 ppt, but rapidly declined towards the upper estuary (14 km upstream) where the salinity fell to 15 ppt. Mysids were present year-round and exhibited marked monthly variations in abundance, with modal peaks in May, Sept., and Dec. 2009 and Apr. 2010 in the mudflat area. All developmental stages were observed, except juveniles which were absent from the middle to upper estuary. Females predominated over males and matured at a smaller size. Juveniles and empty (= post-spawning) females comprised the largest groups (at about 17% for each stage) of the population on the mudflat suggesting that the mudflat serves as the main spawning and nursery ground. Brooding females occurred together with juveniles in all monthly samples, indicating that reproduction was year round. Brood size was independent of female body length, and ranged 5-25 embryos per brood. Mean lengths of eggs (0.26 ± 0.03 mm), and eyeless (0.58 ± 0.06 mm) and eyed larvae (0.73 ± 0.10 mm) were also independent of total length. |
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