Assessment of decadal-scale ecological change at a deep Mid-Atlantic hydrothermal vent and reproductive time-series in the shrimp Rimicaris exoculata
Assessment of decadal-scale ecological change at a deep Mid-Atlantic hydrothermal vent and reproductive time-series in the shrimp Rimicaris exoculata
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DOI：
10.1017/s0025315407056512
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发表时间：
2007-08-01
影响因子：
1.2
通讯作者：
Sohnt, R. A.
中科院分区：
文献类型：
--
作者：
Copley, J. T. P.;Jorgensen, P. B. K.;Sohnt, R. A.
本研究比较了1994 - 2004年大西洋中脊TAG热液丘油区大型动物优势种的分布和丰度。一个地理信息系统（GIS）数据库的汇编从地理参考的534个地点石油TAG热液丘，确定从2004年11月的潜水镜头的linage分析的动物丰度的观察。这些数据进行了比较，从潜水生活在1994年的观察，以评估的程度和人口密度的变化，聚集的虾Rimicaris exoculata在中央黑烟的TAG。地理信息系统数据库也被用来评估的海葵Maractis rimicarivora的丰度和分布的变化，通过模拟在1994年和1995年进行的生物样带的路径。1994年至2004年期间，没有证据表明TAG中央黑烟囱的虾聚集程度有所下降。这一结果表明，在此期间的几次科学考察中，偶尔暴露于高强度的潜水照明，并没有对R.外凹。同样，1994年和2004年之间海葵的分布和丰度也没有显着差异。这些结果表明，与已建立定量时间序列的其他喷口地点相比，TAG的优势物种的特性、分布和丰度保持不变。对R.对1994年9月和2004年11月采集的雌性卵母细胞进行解剖和直接测量，首次比较了该物种不同月份样本的生殖发育。在这些样本中收集的雌性卵母细胞的大小-频率分布没有显著差异，缺乏季节性繁殖。外眼动物
This study presents a comparison of distribution and abundance of dominant megafaunal species at the TAG hydrothermal mound oil the Mid-Atlantic Ridge from 1994 to 2004. A geographical information system (GIS) database was compiled from georeferenced observations of faunal abundances at 534 locations Oil the TAG hydrothermal mound, determined by linage analysis of ROV dive footage from November 2004. These data are compared with observations from submersible lives in 1994 to assess changes in the extent and population density of aggregations of the shrimp Rimicaris exoculata at the central black smokers of TAG. The GIS database was also used to assess changes in abundance and distribution of the anemone Maractis rimicarivora by simulating the path of a biotransect conducted in 1994 and 1995. There was no evidence of a decline in the extent of shrimp aggregations at the central black smokers of TAG between 1994 and 2004. This result indicates that occasional exposure to high-intensity submersible lighting, which took place during several scientific expeditions in the intervening period., does not pose all immediate conservation threat to populations of R. exoculta. Similarly, there were no significant differences in the distribution and abundance of anemones between 1994 and 2004. These results indicate a constancy in the identity, distribution and abundance of dominant species at TAG that contrasts with other vent sites where quantitative time-series have been established. The reproductive pattern of R. exoculata was also examined by dissection and direct measurement of oocytes from females collected in September 1994 and November 2004, providing the first comparison of reproductive development in samples from different months for this species. There was no significant difference in oocyte size-frequency distributions of females collected in these samples, lack of seasonal reproduction in R. exoculata.