Egg size and composition in Ceratoserolis (Crustacea: Isopoda) from the Weddell Sea
Egg size and composition in Ceratoserolis (Crustacea: Isopoda) from the Weddell Sea
复制标题
来自威德尔海的角蝽（甲壳类：等足类）的卵大小和成分
作者：
A. Clarke;D. J. Gore
从博尔格湾、西格尼岛(南奥克尼群岛)、象岛附近的大陆架(南设得兰群岛)和内韦德尔海的两个地点获得了在有袋类中携带新产卵(A1阶段)的产卵雌性Ceratoserolis triobitodes的样本。即使考虑到威德尔海较大的雌性个体以及卵大小和雌性大小之间的正相关关系，新产卵的干质量在内韦德尔海的地点也更大。较大的鸡蛋含有更多的蛋黄，较大的鸡蛋有轻微但显著的氮含量百分比较低的趋势。子午型Ceratoserolis meridionalis的卵比共域的Ceratoserolis triobitoides的卵小，但成分相似。目前还不清楚高纬度地区雌鸟每卵投资较多的原因，但这可能与发育周期稍长有关，而这本身与内韦德尔海较低的水温有关。
SummarySamples of ovigerous female Ceratoserolis trilobitoides carrying newly spawned (stage A1) eggs in the marsupium were obtained from Borge Bay; Signy Island (South Orkney Islands), the continental shelf near Elephant Island (South Shetland Islands), and two sites in the inner Weddell Sea. The dry mass of a newly spawned egg was greater at the inner Weddell Sea sites even when the larger size of the females from the Weddell Sea and the positive relationship between egg size and female size were taken into account. Larger eggs contained more yolk, and there was a slight but significant tendency for larger eggs to have a lower percentage nitrogen content. Eggs from Ceratoserolis meridionalis were smaller in size than sympatric Ceratoserolis trilobitoides, but of similar composition. The reason for a greater investment per egg by females at higher latitudes is not clear, but it may be related to a slightly longer development period, itself associated with the lower water temperatures in the inner Weddell Sea.