牙鲆种群动态及其资源管理     

朱鑫华 《海洋与湖沼》1992,23(3):270-279

本文根据1980—1986年间鱼类生物学参数测定,结合体长分布资料的模拟分析,研究黄、渤海区牙鲆种群年龄结构、死亡动态以及在不同年龄和死亡率条件下世代资源生物量变化的规律。模型分析结果表明,当F=1.0和t_c=6.0a时,单位补充量最大群体产量为1492g。由此认为,现阶段牙鲆资源利用的最佳策略是通过增殖放流,增加资源补充;同时应适当控制捕捞压力,减少渔具对幼鱼资源的破坏并增设繁殖保护区,以追求最大持续产量。  相似文献   

Visualization for fisheries management from a spatiotemporal perspective   总被引：1，自引：1，他引：1  

Kemp  Z.; Meaden  G. 《ICES Journal of Marine Science》2002,59(1):190-202

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泉州湾河口湿地鸟类的种类组成与分布   总被引：10，自引：0，他引：10  

黄国勇  许文宝  刘杰斌 《台湾海峡》2002,21(2):228-233

本文根据1988-1999年进行4次泉州湾河口湿地鸟类调查资料，研究了泉州湾河口湿地自然概况，首次报道了该区鸟类13目30科108种，指出泉州湾河口地区鸟类栖息地面临的威胁因素，建议建立泉州湾河口湿地保护区以保护该区的自然生态系统和鸟类资源。  相似文献   

Comparisons between the influences of habitat, body size and season on the dietary composition of the sparid Acanthopagrus latus in a large marine embayment     

M.E. Platell  H.P. Ang  S.A. Hesp  I.C. Potter 《Estuarine, Coastal and Shelf Science》2007,72(4):626-634

Seasonal samples from Shark Bay on the west coast of Australia were used to determine (1) the habitats occupied by the juveniles and adults of Acanthopagrus latus in this large subtropical marine embayment and (2) the extent to which the dietary composition of this sparid is influenced by habitat type, body length and season. Sampling was undertaken in two habitat types in which A. latus was known to be abundant, namely mangrove (Avicennia marina) creeks and nearby rocky areas, the latter comprising sandstone boulders and/or limestone reefs. The mean total length ±95% CLs of A. latus was far lower in mangrove creeks, 126 ± 6.1 mm, than in rocky areas, 313 ± 4.7 mm. As A. latus attains maturity at ca. 245 mm, the juveniles of this species typically occupy mangrove areas and then, with increasing body size, move to nearshore rocky areas, where they become adults. The species composition of the food ingested by juvenile A. latus in mangrove creeks differed markedly from that of large juveniles and adults in rocky areas. Based on analyses of data for both habitat types combined, this difference was far greater than that between size classes and season, which was negligible. There were indications, however, that, overall within each habitat, the dietary composition did change seasonally, although not with body size. Acanthopagrus latus fed predominantly on mangrove material, sesarmid crabs and small gastropods in mangrove habitats, and mainly on Brachidontes ustulatus in rocky areas, where this mytilid bivalve is very abundant. The mangrove material, which contributed nearly 40% of its overall dietary volume in mangrove creeks, consisted mainly of lateral root primordia. This apparently unique food source for a teleost is presumably ingested through subsurface nipping, which would be facilitated by the mouth and dentitional characteristics of sparids. The almost total lack of correspondence in the dietary compositions of fish in the length class that was well represented in both mangrove and rocky areas illustrates the extent to which this sparid is capable of opportunistic feeding behaviour.  相似文献   

蒙特卡罗法在天然气水合物资源量计算中的应用     

曾繁彩  吴琳  张光学  梁金强  王宏斌 《海洋地质与第四纪地质》2006,26(5):139-144

天然气水合物甲烷资源量的估算是天然气水合物研究中的热点问题。运用体积法计算含水合物沉积物中的甲烷资源量时,存在参数赋值不确定的问题,从而影响了计算结果的可信度。采用蒙特卡罗法,通过计算样本的频率可以较好地评价和描述计算结果的信度,弥补体积法的不足。对采用蒙特卡罗法估算甲烷资源量的原理进行了分析和探讨,并以麦肯齐三角洲和南海海域水合物为例,计算了水合物赋存区的甲烷资源量。  相似文献   

Effort distribution and catch patterns adjacent to temperate MPAs   总被引：7，自引：2，他引：7  

Murawski  Steven A.; Wigley  Susan E.; Fogarty  Michael J.; Rago  Paul J.; Mountain  David G. 《ICES Journal of Marine Science》2005,62(6):1150-1167

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南黄海及相邻陆区松散沉积层磁性地层的研究     

周墨清  葛宗诗 《海洋地质与第四纪地质》1990,(4)

本文通过研究区5个钻孔松散沉积岩心磁性地层的划分对比,获知布容与松山极性带的界线,南黄海和陆区北部位于80.0—99.5m。陆区的南部此界线于270.4m深处。松山和高斯极性带的界线,海区未揭露到,其沉积起始时间都小于1.7Ma。而陆区的南、北部分别位于117m和328.2m。高斯和吉尔伯特极性带的界线,陆区北部为140m,而南部区为460.15m。沉积起始时间为3.4Ma。吉尔伯特底界仅北部陆区所揭示,为190.5m。松散沉积层与下伏白垩纪(?)石灰岩接触面位于400.35m,沉积起始时间约17.0Ma。  相似文献   

Addressing ecosystem effects of fishing using marine protected areas   总被引：5，自引：1，他引：5  

Sumaila  Ussif Rashid; Guenette  Sylvie; Alder  Jackie; Chuenpagdee  Ratana 《ICES Journal of Marine Science》2000,57(3):752-760

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闽中、闽东渔场扁舵鲣的资源生物学     

卢振彬  颜尤明  戴泉水 《台湾海峡》1992,(3)

本文以1981～1984年4～9月累计18个月在闵中、闵东渔场开展中上层鱼类资源开发性探捕调查的材料,报道了扁舵鲣的生态分布、群体结构和生活史主要特征。鱼群先后于4～7月由南而北进入本渔场,数量分布以5月为多;栖息的最适温、盐度分别为23.5～25.5℃和33～34;渔获群体由0～V龄组成;性成熟的最小年龄为Ⅰ龄,最小叉长271～280mm;生长参数L_∞=484.44mm,W_∞=2050.76g,K=0.5109,t_0=0.3598;瞬时自然死亡率为0.8937,开发比率为0.2138,属于轻度利用的鱼类资源,尚有较大的开发潜力。  相似文献   

Variations in age-0 pollock distribution among eastern Bering Sea nursery areas: A comparative study through acoustic indices     

A. Winter  K.O. Coyle  G. Swartzman 《Deep Sea Research Part II: Topical Studies in Oceanography》2007,54(23-26):2869

Cohort abundance of walleye pollock (Theragra chalcogramma) is subject to strong interannual variation in the eastern Bering Sea, and this variation is known to be determined largely at the age-0 stage. We estimated the spatial distributions and densities of age-0 walleye pollock in five nursery areas around the eastern Bering shelf in three successive years (1997–1999) from acoustic survey data. Concurrently, we calculated estimates of the spatial distribution of euphausiids, a major prey of age-0 walleye pollock, and estimates of spatial overlap of groundfish predators with the age-0 walleye pollock. The analyses showed that all nursery areas had low densities of age-0 walleye pollock in 1997, which ultimately produced the weakest adult year-class. In the intermediate year of 1998, age-0 densities were low to medium, and in 1999, which produced the strongest of the three adult year-classes, all nursery areas had medium to high age-0 walleye pollock densities. Euphausiid distributions had a consistently positive spatial relationship with age-0 walleye pollock. Groundfish predator density ratios were positively related to age-0 walleye pollock density when age-0 walleye pollock were displaced relatively northward. Our results suggest that abundance of age-0 walleye pollock, and hence of adult cohorts in the eastern Bering Sea, can be predictable from a concise set of indicators: the densities of age-0 walleye pollock at nursery areas in mid- to late-summer, their spatial relationship to euphausiids and groundfish predators, and the latitudinal trend of their distributions. The 3 years 1997–1999 had significant differences of physical conditions in the eastern Bering Sea, and represent an advantageous framework for testing these hypotheses.  相似文献