Habitat characteristics and spatial arrangement affecting the diversity of fish and decapod assemblages of seagrass (Zostera marina) beds around the coast of Jersey (English Channel)     

Emma L. Jackson  Martin J. Attrill  Malcolm B. Jones 《Estuarine, Coastal and Shelf Science》2006,68(3-4):421

Recent research and management plans for seagrass habitats have called for landscape level approaches. The present study examines the spatial utilisation of subtidal seagrass beds by fish and decapods around the coast of Jersey (49°N 02° W). A hierarchical scale of landscape configuration and the plant characteristics of eight seagrass beds were measured and the contributions of these variables as predictors of the properties of the fish and decapod assemblages were evaluated using multiple linear regression models. The results indicated that total diversity had a negative relationship with transect heterogeneity and total species number had a weak negative association with increasing fragmentation. Both total diversity and total species number showed a positive relationship with depth. In fact, in all models of species number and densities, values were higher in deeper seagrass beds. Total decapod density increased with aggregation of seagrass patches within a landscape. In addition to landscape configuration, smaller-scale structural changes in both canopy height and epiphyte load appeared to influence densities of decapod crustaceans. At night, fewer patterns could be explained by the independent variables in the model.  相似文献   

Simulating trawl herding in flatfish: the role of fish length in behaviour and swimming characteristics   总被引：2，自引：0，他引：2  

Winger  Paul D.; Walsh  Stephen J.; He  Pingguo; Brown  Joseph A. 《ICES Journal of Marine Science》2004,61(7):1179-1185

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东白令海三种经济鲽类捕捞群体结构与生长特性比较     

苏振明 《中国海洋大学学报(自然科学版)》1992,(4)

对东白令海水域双线鲽(Lepidopsetta bilineata)、太平洋拟庸鲽(Hippoglosso-ides elassodon)和阿拉斯加鲽(Pleuronectes quadrituberculata)等三种经济鲽类的捕捞群体结构和生长特性进行比较。得出结论是:(1)捕捞群体结构复杂;(2)渐近体长和渐近体重较大、寿命长、K值小;(3)雌鱼比雄鱼个体大、生长快、寿命长;(4)三种鲽类的捕捞群体结构和生长特性有明显差异。  相似文献   

Fish-farming effects on benthic community structure in coastal sediments: analysis of meiofaunal recovery   总被引：8，自引：0，他引：8  

Mazzola  A.; Mirto  S.; La Rosa  T.; Fabiano  M.; Danovaro  R. 《ICES Journal of Marine Science》2000,57(5):1454-1461

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Seasonal use of coastal resources by otters: Comparing sandy and rocky stretches     

Miguel Clavero  Jos Prenda  Miguel Delibes 《Estuarine, Coastal and Shelf Science》2006,66(3-4):387-394

Seasonal patterns of use of coastal resources by otters have been studied, simultaneously performing diet analyses and spraint counts (expressed as marking intensity, MI). In spite of the small size of the study area, two different sectors could be clearly identified, a sandy and a rocky one. The origin (freshwater or coastal) of most prey types could also be determined. Surveys were performed bimonthly and classified as autumn–winter (A–W) or spring–summer (S–S).In the sandy sector, eels, flatfish and grey mullets were more frequently consumed in A–W, while crayfish was more frequently consumed in S–S. None of the identified prey types in the rocky sectors showed different frequency of occurrence values between the two periods. In this sector otter fed mainly on coastal prey throughout the year, while in the sandy one there was a clear shift from coastal prey to freshwater ones in S–S. The decrease of coastal prey consumption in S–S in the sandy sector coincided with the lowest MI values, showing that in this period otters use coastal areas less intensely. Though shifts in otter diet and use of space in the sandy sector are probably influenced by the population dynamics of estuarine fish species and crayfish, the increased tourist disturbance during spring and summer in the sandy sector could be an important determinant of the observed patterns. Finally, the results show that MI can be used as a reliable measure of habitat use by otters, at least in small areas.  相似文献   

台湾海峡金色小沙丁鱼幼鱼索饵群体研究   总被引：2，自引：1，他引：2  

杨圣云  丘书院 《台湾海峡》1992,11(3):244-250

本文研究了台湾海峡南部和北部的金色小沙丁鱼当年生幼鱼计数性状和量度性状特征差异,并结合其生物学特性、产卵场、洄游及海区环境特征进行综合分析。结果表明,台湾海峡南部和北部的索饵幼鱼仍属于同一地方种群:闽南-台湾浅滩语地方种群。根据其索饵洄游特点,可分为台湾海峡南部和北部两个索饵群体.  相似文献   

鱼类生长激素的异源表达、应用及安全性评价   总被引：3，自引：0，他引：3  

张学成  刘顺梅  臧晓南 《中国海洋大学学报(自然科学版)》2007,37(6):939-946

鱼类生长激素对鱼的生长发育起着重要的调节作用，能促进鱼体快速生长，提高饵料转化率，在水产养殖业中具有重大应用价值。转生长激素基因鱼具有快速生长效应，可以缩短养殖周期，降低养殖成本和风险。鱼类生长激素基因异源表达体系的建立和发展，使获得大量廉价的鱼类生长激素产品成为可能，为鱼类养殖业新型饵料添加剂的研制开辟了新的途径。本文综述了转生长激素基因鱼和鱼类生长激素基因的异源表达两方面的研究及其安全性评价。  相似文献   

美国红鱼试养的初步研究     

毛兴华  季如宝  朱明远  王宇宁 《海洋科学进展》1997,(1)

笔者自行培育的美国红鱼苗体长25～30mm．1996年6月上、中旬到当年12月中旬．其个体的平均重量分别达到了750g和800g，生长速度优于我国其他养殖鱼种。  相似文献   

Relationships between benthic macrofauna and habitat suitability for juvenile common sole (Solea solea, L.) in the Vilaine estuary (Bay of Biscay, France) nursery ground     

D. Nicolas  F. Le Loc'h  Y. Dsaunay  D. Hamon  A. Blanchet  O. Le Pape 《Estuarine, Coastal and Shelf Science》2007,73(3-4):639-650

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TSDV: A GIS tool for inspecting trawl survey data     

Fortunati  L.; Garofalo  G.; Demontis  R. 《ICES Journal of Marine Science》2002,59(1):168-178

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