The distribution of brachyuran crustacean megalopae in the waters of the York river, lower Chesapeake Bay and adjacent shelf: Implications for recruitment     

David F. Johnson 《Estuarine, Coastal and Shelf Science》1985,20(6):693-705

Vertical and horizontal distributions are described for megalopae of 11 brachyuran taxa common to the lower Chesapeake Bay and adjacent shelf. Three distribution patterns are apparent from horizontal distribution.

1. (1) More than 75% of the megalopae of estuarine adults, such as Hexapanopeus angustifrons, Neopanope sayi, Panopeus herbstii, Rhithropanopeus harrisii and Pinnotheres ostreum, are retained in estuarine waters.

2. (2) The megalopae of three estuarine taxa, Callinectes sapidus, Uca spp. and Pinnixa sp., are most abundant on the shelf.

3. (3) More than 90% of the megalopae of the shelf species, Portunus sp., Cancer irroratus and Libinia spp. remained in shelf waters.

Vertical distributions indicate the megalopae of a majority of estuarine crabs are epibenthic when waters are stratified. Exceptions include the megalopae of both Rhithropanopeus which are found slightly shallower in well mixed waters and Callinectes sapidus which are generally most abundant in the neuston. The megalopae of two shelf species, Portunus sp. and Cancer irroratus, reach highest densities in surface waters, while those of Libinia spp. are common in the epibenthos.Megalopal distributions analyzed with respect to water column stratification show megalopae never reached highest densities within the layer of the pycnocline. The megalopae of five species show significant shifts in vertical distributions between stratified and homogeneous water columns.  相似文献   

Larval Stages and Balanus (Cim'pedia) Settlement in a Port Environment with a Key to Naupliar Stages of Tyrrhenian Species     

SEBASTIANO GERACI  VlTTORIO ROMAIRONE 《Marine Ecology》1986,7(2):151-164

Abstract. .Some observations on larval life and barnacle settlement in the Port of Genoa are reported together with a key of the nauplii of the four species recorded in the Tyrrhenian coasts: Balanus amphiuite, Balanus perforatus, Balanus trigonus and Balanus eburneus. Weekly densities of naupliar stages for each species as well as the average percent reduction from one stage to the next until the cypris stage have been recorded. The amount of the latter is recorded both in plankton and along with settled barnacles on artificial substrata.  相似文献   

The consumption of zooplankton by early life stages of fish in the North Sea     

Heath  Michael R. 《ICES Journal of Marine Science》2007,64(9):1650-1663

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Physical forcing of onshore transport of crab megalopae in the northern Portuguese upwelling system     

Maria Joo Almeida  Henrique Queiroga 《Estuarine, Coastal and Shelf Science》2003,57(5-6):1091-1102

Wind-driven circulation is a mechanism that may be involved in the shoreward transport of invertebrate larvae. This study investigated the temporal variability of the supply of crab megalopae to an estuary located in the northwest coast of Portugal, which is affected by seasonal upwelling, and related variations in supply to several upwelling indices. Megalopae of the European common shore crab Carcinus maenas (L.). were collected daily, using artificial settlement substrates, during a 3-month period, from March 15 to June 15, 2000. Two settlement episodes were detected, which were consistent with the variation in abundance and size of juvenile crabs. Variations in subtidal sea level and sea surface temperature anomaly were correlated with the strength of along-shore wind stress and consistent with upwelling theory. Contingency analyses showed positive significant associations between increasing intensity of southerly winds and megalopal supply, for time lags of 0–6 d, indicating that shoreward transport occurred during relaxation or reversal of upwelling favourable winds. Associations between megalopal supply and tidal range or the duration of nocturnal flood were not detected. Compared to other studies of the supply of crab megalopae to coastal habitats that used a similar methodology, very low numbers of megalopae were collected during this study. The paucity of C. maenas megalopae in the Ria de Aveiro is in agreement with the low densities of this larval stage in the plankton, and indicates that maintenance of the population is achieved despite a low supply of megalopae.  相似文献   

遮浪湾浮游幼虫的季节分布     

蔡国雄 《热带海洋学报》1992,(1)

本文分析遮浪湾浮游幼虫的季节分布及其与环境因子的关系,并讨论其它有关生态问题。湾内浮游幼虫总数量和主要类群数量的季节变化呈现典型的亚热带海区的双周期型,数量的平面分布随离岸距离增加而增多,水温过低或过高和低盐度均对幼虫的生长活动不利。湾中甲壳动物的无节幼虫最丰富,多毛类和棘皮动物的浮游幼虫次之。  相似文献   

中华乌塘鳢仔稚鱼的生长发育     

张维翥 《热带海洋学报》1992,(2)

在实验培养条件下,观察了中华乌塘鳢Bostrichthys sinensis(Lacepede)仔稚鱼期的鳍、消化管、鳃耙等器官的发育过程。测量仔稚鱼标本198尾,将全长等11个形态指标数据进行线性回归处理,找出各形态指标与全长之间的关系。  相似文献   

Atmospheric forcing, larval drift, and recruitment of capelin (Mallotus villosus)     

Dalley  Edgar L.; Anderson  John T.; deYoung  Brad 《ICES Journal of Marine Science》2002,59(5):929-941

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海水仔稚鱼的必需脂肪酸--n-3系列高度不饱和脂肪酸研究概况   总被引：2，自引：0，他引：2  

刘镜恪  陈晓琳 《中国海洋大学学报(自然科学版)》2002,32(6):897-902

本文从海鱼鱼卵的脂肪酸组成及各种脂肪酸被利用的顺序、n- 3系列高度不饱和脂肪酸 (n-3HUFA)对海水仔稚鱼生长和存活的影响、乳化油强化轮虫和卤虫饵料的重要性、几种海水仔稚鱼对n- 3HUFA的需要量、DHA和 EPA对海水仔稚鱼不同的生理作用、海水仔稚鱼活饵料和微粒饲料中DHA与 EPA比例的重要性、n- 3HUFA含量与海水比目鱼非正常色素沉着的关系、乳化油和微粒饲料中 n- 3HUFA不同的分子结构形式等方面系统综述了海水仔稚鱼的必需脂肪酸—— n- 3系列高度不饱和脂肪酸的国内外研究进展。旨在学习、借鉴国外的研究成果和经验 ,深入开展我国海水仔稚鱼的营养研究。  相似文献   

饵料对斑玉螺浮游幼虫存活与生长的影响   总被引：2，自引：0，他引：2  

叶兆弘  钟幼平  贤锋 《台湾海峡》2001,20(Z1):49-51

采用金藻、金藻和云微藻、云微藻三组饵料分别投喂斑玉螺浮游幼虫，每天测定壳宽和存活率.结果表明，10d后，投有金藻的两组存活率较高，生长较快，作者认为，金藻是斑玉螺浮游幼虫的适合饵料.  相似文献   

海水仔稚鱼早期阶段的脂类营养研究概况     

刘镜恪 《海洋科学进展》2001,19(4):93-97

简要论述了海水仔稚鱼不同早期阶段的脂类营养 ,包括卵囊的脂类营养 ,胚胎和仔鱼发育期间的脂类代谢 ,仔鱼饥饿期间的脂类 ,轮虫脂类营养的改善 ,卤虫脂类营养的改善 ,以及海水仔稚鱼开口饵料的脂类营养等  相似文献