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The jumbo flying squid(Dosidicus gigas) population was surveyed with the help of Chinese squid jigging vessels off the Costa Rica Dome(4°–11°N, 90°–100°W) in 2009 and 2010. The daily catch of D. gigas in the two survey cruises ranged from 0 to 5.5 t and was mostly obtained from the areas bounded by 6°–9°N and 91°–94°W and by 6°30′–7°30′N and 96°–97°W. The sea surface temperature in the areas yielding the most catch ranged from 27.5 to 29℃. The sex ratio of the total catch was 3.75:1(female: male). The mantle length of the squid ranged from 211 to 355 mm(male) and from 204 to 429 mm(female) with an average of 297.9 and 306.7 mm, respectively. In the relationship of the mantle length(mm) and body weight(g) of the squid, there was no significant difference between sexes. The female and male were at a similar maturity, and most individuals are maturing or have matured with a few females being spent. The size(mantle length) and age at the first sexual maturity were 297 mm and 195 d in females, and less than 211 mm and 130 d in males, respectively. Most of the sampled stomachs(70.6%) had no food remains. The major preys of the squids were fish, cephalopods and crustaceans, with the most abundant Myctophum orientale and D. gigas. The preys in more than 65% of the non-empty sampled stomachs evidenced the cannibalism of D. gigas. The results improved current understanding of the fishery biology of D. gigas off the Costa Rica Dome, which may facilitate the assessment and management of relative fishery resources. 相似文献
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剥蚀型汇聚板块边缘大地震成因机理研究:来自国际综合大洋钻探344航次的报告 总被引：3，自引：0，他引：3
旨在探究剥蚀型汇聚板块边缘大地震成因机理的国际综合大洋钻探(IODP)344航次于2012年10月23日至12月11日在中美洲地震频发的哥斯达黎加西部海域实施钻探。介绍了钻探区域的大地构造特征、该航次的主要科学目标、执行情况、所取得的初步成果以及对航次后研究工作的展望等。航次后更多深入细致的研究工作正在进行中,所取得的研究成果将集中在2014年南京召开的航次后学术研讨会上汇报、交流、集成、总结,从而提升对剥蚀型汇聚板块边缘大地震起源机理的认识。 相似文献
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《海洋地质与第四纪地质》2012,(1):18
IODP344航次是IODP334航次的后续,航次主要依据IODP537号建议书,哥斯达黎加地震起源计划(CRISP)的关键目标就是理解在剥蚀控制的俯冲带大陆边缘大地震聚集和破裂的物理过程。航次的主要科学目标包括:(1)俯冲带沉积物和基岩的岩性、构造和物理性质特征;(2)俯冲带的剥蚀速率和上部板块的沉降历史;(3)上部板块中流体与岩石的相互作用及地球化学过程;(4)大陆边缘上部斜坡带应力场的演变。 相似文献
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尽管海洋深海钻探的历史已有40多年了,但是有关洋壳成分和结构的资料仍然很少,并基本上建立在来自最上层的地球物理和零星地质材料的基础上。至今在哥斯达黎加海隆南侧几个航次中所打的深达2 111 m的504B号钻孔,是惟一穿过玄武岩层和大部分下伏岩墙组合的钻孔,但是它未能达到后者与辉长岩之间的边界。众所周知,洋壳第2层(玄武岩)的厚度与其在扩张区的形成速度有关:速度越快,玄武岩层就越薄。最小的厚度位于超快速扩张的洋中脊地段之下,在其轴部。近来已确定,将近2 000~1 100万年前,在太平洋、纳斯卡和科科斯岩石圈板块的三联点附近,形成了… 相似文献
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2006年3月大约100名来自48个国家的代表出席了在圣约瑟召开的第一届暴洪预报国际研讨会。会议由WMO、NOAA以及美国国际发展署(USAID)组织,哥斯达黎加国家气象研究所承办。与会者认为:●应该通过在暴洪预警方面的国际合作,形成一个有关减小暴洪影响的国际性行动指南。●应该重视 相似文献
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2011年3月13日至4月13日哥斯达黎加地震起源计划IODP334航次在中美洲哥斯达黎加俯冲带大陆边缘斜坡带实施。该航次的主要科学目标是研究俯冲剥蚀控制的俯冲带大地震的聚集和破裂过程。在1个月的钻探时间内,总共在4个站位、8个钻孔中获得1492．88m的岩芯,获得许多中新世到现代的火山灰层,初步确定上覆板块内沉积物和... 相似文献
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Subtidal sediments of Isla del Coco(Cocos Island),Costa Rica were described in their grain size,sorting,organic matter,and carbonates from 27 dredge samples(3-75 m),collected in April 2010.The organic matter range between 1.37-3.31%and carbonates presented a mean of 74±17%.The sorting was moderately or poorly.The grain size ranged between 0.1-1.1mm.The pattern is that sediment change from inner to mouth of bays.Carbonates and gravel fractions increased offshore and organic matter have high values inner the bays.Input of vegetal debris and mud was from the rivers of this island covered with rain and cloud forest. 相似文献
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