Brooding season, sex ratio, and brood pouch development in the seaweed pipefish, Syngnathus schlegeli, in Otsuchi Bay, Japan
Brooding season, sex ratio, and brood pouch development in the seaweed pipefish, Syngnathus schlegeli, in Otsuchi Bay, Japan
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日本大槌湾海藻海龙 Syngnathus schlegeli 的育雏季节、性别比例和育儿袋发育
DOI：
10.1007/s10228-001-8130-9
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发表时间：
2001
影响因子：
1.2
通讯作者：
Yoshirô Watanabe
中科院分区：
文献类型：
--
作者：
Satoshi Watanabe;Yoshirô Watanabe
雄性的海藻海龙，Syngnathus schlegeli，在育儿袋里照顾它们的卵。从春季到秋季，定期从日本本州岛北方太平洋沿岸的大槌湾的浅海草床中采集这些海龙，以调查基本的生殖生态学。海龙出现在沿海海草床与生殖的开始。繁殖季节为5月至至少10月，7月为高峰期。人工饲养试验表明，雄鱼的育雏期与水温呈负相关，在海湾中可持续1个月左右。几乎所有的雄性都在繁殖季节的高峰期孵卵。虽然大多数雄鱼的卵囊是满的或没有卵，但6.2%的雄鱼的卵囊部分被填满（20%-90%），并且在一些雄鱼的卵囊中发现了多个窝，这表明海龙鱼的交配系统是一夫多妻制，可能是一夫多妻制。性别比在月份间波动，总体性别比偏向男性。未成熟的育袋的男性的身体大小有很大的范围内，从133至215毫米的标准长度（SL）。最小的育雏雄鸟体长为134 mm。平均SL的育雏男性显着大于nonbroding成熟男性。雄性的数量与不成熟的育儿袋是更大的开始比晚些时候在生殖季节。结果似乎共同表明，发生的比例较大的不成熟的男性在生殖季节开始时，可能归因于新的招聘和较大的身体尺寸在成熟，导致男性交易的生殖努力，体细胞生长，也许是为了增加未来的生殖成功。
Males of the seaweed pipefish,Syngnathus schlegeli, take care of their eggs in the brood pouch. These pipefish were periodically collected from the shallow seagrass beds in Otsuchi Bay on the Pacific coast of northern Honshu, Japan, from spring to autumn to investigate the basic reproductive ecology. Appearance of the pipefish in the coastal seagrass beds coincided with the initiation of reproduction. The reproductive season was from May to at least October, with its peak in July. A rearing experiment revealed that the brooding period of the male had a negative correlation with water temperature, and it was estimated to last about 1 month in the bay. Almost all males were brooding during the peak of the reproductive season. Although, the brood pouch of most males was either full or devoid of eggs, 6.2% of the males had a partially filled (20%–90%) brood pouch, and multiple clutches were identified in the brood pouch of some males, indicating that the mating system of the pipefish is polygamous, perhaps polygynous. Sex ratio fluctuated among months, and the overall sex ratio tended to be biased to male. Body size of males with an immature brood pouch had a wide range, from 133 to 215 mm standard length (SL). The smallest brooding male was 134 mm SL. Mean SL of brooding males was significantly larger than that of nonbrooding mature males. The number of males with an immature brood pouch was greater at the beginning than later in the reproductive season. The results seem to collectively indicate that the occurrence of a larger proportion of immature males at the onset of the reproductive season may be ascribed to both new recruitment and larger body size at maturation, resulting from the males trading the reproductive effort to somatic growth, perhaps to increase future reproductive success.