Resting stages of Tortanus forcipatus (Crustacea, Calanoida) in sediments of Victoria Harbor, Hong Kong
Resting stages of Tortanus forcipatus (Crustacea, Calanoida) in sediments of Victoria Harbor, Hong Kong
复制标题
DOI：
10.1016/j.ecss.2005.12.011
复制
发表时间：
2006-05-01
影响因子：
2.8
通讯作者：
Qian, Pei-Yuan
中科院分区：
文献类型：
--
作者：
Dahms, Hans-Uwe;Li, Xiangdong;Qian, Pei-Yuan
在实验室通过对维多利亚港(香港)沉积物中出现的无节幼体进行计数，确定了可存活和非可存活(即所谓的休眠卵)胚胎的分布和丰度。表层(0-5 cm)附近有最多存活休眠卵，深度为37 cm。可存活卵的数量随着沉积物深度的增加而急剧减少，特别是在内港站，但滞育卵在深达25厘米时仍可存活。对沉积物的PB-210分析表明，它们的平均卵龄为4.9岁。由沉积物年龄回归出的卵密度计算表明，该沉积物中东方锥虫的卵死亡率为0.135年(-1)，即每年卵存活率为78.22%。休眠卵的水平分布范围为24.25×10(3)~58.90×10(3)m(-2)，平均值为36.8×10(3)m(-2)。可持续一段时间的可存活休眠卵的积累为维多利亚港沉积物中存在华支睾吸虫卵库提供了证据。
The distribution and abundance of viable and non-viable (so-called resting eggs) embryos of the calanoid copepod Tortanus forcipatus were determined in the laboratory by the enumeration of nauplii that emerge from sediments collected in Victoria Harbor (Hong Kong). Sediment cores sliced down to a depth of 37 cm showed the highest number of viable resting eggs near the surface layer (0-5 cm). The number of viable eggs sharply decreased with sediment depth, particularly at the inner harbor stations, although diapause eggs remained viable as deep as 25 cm. Pb-210 analyses of the sediments indicated that the mean egg age was 4.9 years. The egg mortality of T. forcipatus in the sediments was 0.135 year(-1), or 78.22% annual egg survival, calculated by regressing In (egg density) from sediment age. The range of horizontal distribution of viable resting eggs was 24.25 x 10(3)-58.90 x 10(3) m(-2), with a mean value of 36.8 x 10(3) m(-2) over all stations. The accumulation of viable resting eggs that can persist for an extended period of time provided evidence for the existence of an egg bank of T. forcipatus in the sediments of Victoria Harbor.