台湾南湾秋末冬初水螅水母类的组成与分布   总被引：4，自引：0，他引：4  

黄将修  张金标  连光山 《台湾海峡》2003,22(4):437-444

本文分析了2001年11月2～3日和12月8～10日在台湾南湾12个测站采集的表层和底层92份浮游动物样品,共鉴定水螅水母18种,其中8种是台湾周围海域的新记录.半口壮丽水母(Aglaura hemistoma)和四叶小舌水母(Liriope tetraphylla)为优势种,它们在11月和12月分别占水螅水母类总量的77％和94％以上.南湾水螅水母类的种类数和个体丰度均以12月(17种,3102×10~(-3)个/m~3)明显多于11月(6种,72×10~(-3)个/m~3).在冬季,外海高盐水团是影响水螅水母类分布的主要因素,盐度与水螅水母类多样性指数的相关关系显著,文章还比较了南湾与邻近海区水螅水母类的季节变化.  相似文献   

Rare species, habitat diversity and functional redundancy in marine benthos   总被引：1，自引：0，他引：1  

Kari E. Ellingsen  Judi E. Hewitt  Simon F. Thrush 《Journal of Sea Research》2007,58(4):291-301

Macro-ecological theories relating species richness, abundance, range size, biological traits and environmental tolerance have rarely been tested in marine soft-sediments, despite the spatial extent of these habitats and the inherent richness of resident communities. This study examines the contribution of rare species to marine soft-sediment communities from New Zealand, focussing on the relationships of range size with abundance, environment, habitat diversity and life history traits. 54% of the 351 species sampled exhibited restricted ranges (found at ≤ 2 sites). In contrast to many terrestrial systems, we observed only a weak positive relationship between abundance and frequency of occurrence. Restricted-range species were not randomly distributed, with their distribution related to habitat characteristics, suggesting an important link between habitat diversity and rarity. They exhibited a similar range of traits to the total observed species pool, suggesting that they are not only important to biodiversity but could play a role in stability. Restricted range species were generally not small and this, together with the number of different biological traits represented, suggests that rare species are important to the functioning of marine systems. Thus, our results highlight the importance of considering rare species in habitat-based approaches to conservation.  相似文献   

三亚湾浮游动物数量分布及群落特征的季节变化   总被引：4，自引：0，他引：4  

时翔  王汉奎  谭烨辉  黄良民 《海洋通报》2007,26(4):42-49

根据三亚湾2005年春、夏、秋和冬季航次的调查资料,分析了这4个季度的浮游动物的种类组成、优势种、群落结构、丰度和生物量的时空变化。经过鉴定共有终生性浮游动物125种,阶段性浮游动物17种,其中毛颚类幼虫和短尾溞状幼虫是各个季度都出现的优势种。三亚湾的浮游动物可以分为河口类群、暖水沿岸类群和广布暖水外海类群。全年浮游动物平均丰度为95.91ind·m-3,浮游动物平均生物量为69.22mg·m-3;浮游动物丰度的季节分布是夏>秋>春>冬,平均生物量的季节分布是秋>夏>春>冬,总体上一般是夏秋季高于冬春季。冬季浮游动物丰度与浮游植物细胞总密度之间没有相关性。  相似文献   

2001年夏季胶州湾浮游植物群落结构的特征   总被引：7，自引：2，他引：7  

刘东艳  孙军  陈洪涛  张利永 《中国海洋大学学报(自然科学版)》2003,33(3):366-374

本文根据 2 0 0 1年 8月 2 0～ 2 2日期间对胶州湾海域进行的大面积调查资料 ,对浮游植物的群落结构进行了初步研究。结果表明 ,浮游植物群落主要由沿岸暖水性种类组成 ,以硅藻为主 ,还有少量的甲藻、金藻和绿藻。湾中央出现的种类最多 ,湾口其次 ,湾边缘最少。细胞数量的高值区出现在B断面和 A5站周围的水域 ,低值区出现 D断面和 E断面。此外 ,对群落多样性的研究表明 ,Shannon指数在湾北部的多数站位高于湾南部水域 ,在 D2和 B1站出现 2个低值区 ;Margalef指数在湾内东部和 D4站周围水域明显高于湾内西部和湾口水域 ;均匀度则在 B1和 D2站周围水域偏高。浮游植物群落同营养盐的相关分析表明 ,调查期氨盐和磷酸盐是影响浮游植物生长的主要营养盐 ,中肋骨条藻、浮动弯角藻和旋链角毛藻等几种优势种类决定了这一关系  相似文献   

Effects of pulsed nutrient inputs on phytoplankton assemblage structure and blooms in an enclosed coastal area   总被引：6，自引：0，他引：6  

Sofie Spatharis  George Tsirtsis  Daniel B. Danielidis  Thang Do Chi  David Mouillot   《Estuarine, Coastal and Shelf Science》2007,73(3-4):807-815

The response of phytoplankton assemblage structure to terrestrial nutrient inputs was examined for the Gulf of Kalloni in the Northern Aegean Sea, a productive semi-enclosed coastal marine ecosystem. The study was focused on a typical annual cycle, and emphasis was placed on the comparative analysis between blooms developing after significant nutrient inputs from the watershed, and naturally occurring blooms. Baseline information was collected on a monthly basis from a network of stations located in the oligotrophic open sea and the interior and more productive part of the embayment. Intensive sampling was also carried out along a gradient in the vicinity of a river which was the most important source of freshwater and nutrient input for the Gulf. Phytoplankton assemblage structure was analyzed from 188 samples using diversity indices (Shannon and Average Taxonomic Distinctness), multivariate plotting methods (NMDS), multivariate statistics (PERMANOVA), and canonical correspondence analysis (CCA). Three characteristic assemblages were recognized: (1) an autumn assemblage developed under nutrient depleted conditions, having low diversity due to the dominance of two small diatoms, (2) a winter bloom of the potentially toxic species Pseudo-nitzschia calliantha occurring immediately after a nutrient peak and characterized by very low diversity, and (3) a naturally occurring early summer bloom of centric diatoms with relatively high diversity. The results of the study support the view that moderate nutrient inputs may have a beneficial effect on the functioning of coastal ecosystems, stimulating the taxonomic diversity through the growth of different taxonomic groups and taxa. On the other hand, a sudden pulse of high nutrient concentrations may greatly affect the natural succession of organisms, have a negative effect on the diversity through the dominance of a single species, and can increase the possibility of a harmful algal bloom development.  相似文献   

Nutrient and plankton dynamics in an intermittently closed/open lagoon, Smiths Lake, south-eastern Australia: An ecological model     

Jason D. Everett  Mark E. Baird  Iain M. Suthers 《Estuarine, Coastal and Shelf Science》2007,72(4):690-702

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Selectivity experiments in the NE Mediterranean: the effect of trawl codend mesh size on species diversity and discards     

Stergiou  K. I.; Politou  C.-Y.; Christou  E. D.; Petrakis  G. 《ICES Journal of Marine Science》1997,54(5):774-786

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Diel variations in the vertical distribution of copepods off the north coast of Spain   总被引：1，自引：0，他引：1  

de Puelles  M. L. Fernandez; Valdes  L.; Varela  M.; Alvarez-Ossorio  M. T.; Halliday  N. 《ICES Journal of Marine Science》1996,53(1):97-106

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Annual Cycle of Zooplankton Biomass, Abundance and Species Composition in the Neritic Area of the Balearic Sea, Western Mediterranean   总被引：7，自引：0，他引：7  

MªLuz Fernández de  Puelles  David Grás  & Santiago Hernández-León 《Marine Ecology》2003,24(2):123-139

Abstract. Seasonal changes in zooplankton biomass, abundance and species composition were studied at a neritic station in the Balearic Sea between April 1993 and May 1994. Sampling was carried out every 10 days in a zone influenced by the main current circulating through the Mallorca channel. Three main peaks of zooplankton biomass and abundance were observed: (1) at the beginning of summer when the thermocline developed, (2) in autumn when the thermocline broke down, and (3) in early spring. The smaller zooplankton fraction (100–250 μm) comprised on average 32 % of the total biomass and 73 % of total abundance. Copepods were the predominant group (64 % of the total abundance) with Clausocalanus, Oithona and Paracalanus being the most abundant genera. Paracalanus parvus, Clausocalanus furcatus, Acartia clausi, Oithona plumifera, Temora stylifera, Centropages typicus and Oncaea mediterranea were found to be the most important species in the area. Other abundant groups were cladocerans (15 %) and meroplankton larvae (12 %), both of which were particularly numerous during the stratified period. The copepod community was characterized by the above‐cited perennial species, which were abundant during the cycle studied. However, the influence of the hydrological conditions of the Balearic Sea, such as the Atlantic water influx and the physical structure of the water column (stratification and mixing), promoted the observed variability in zooplankton as well as the appearance of characteristic species during the annual cycle.  相似文献   

Nutrients and zooplankton composition and dynamics in relation to the hydrological pattern in a confined Mediterranean salt marsh (NE Iberian Peninsula)   总被引：4，自引：1，他引：4  

Anna Badosa  Dani Boix  Sandra Brucet  Rocío Lpez-Flores  Xavier D. Quintana 《Estuarine, Coastal and Shelf Science》2006,66(3-4):513-522

The role of the hydrological regime in the nutrients and zooplankton composition and dynamics has been analysed in five lagoons of La Pletera salt marshes (NE Iberian Peninsula) during a complete hydrological cycle (2002–2003). Two of the lagoons have their origin in the old river mouths while the other three were recently created in the framework of a Life Restoration project. This fact has also allowed us to study the effect of the lagoon age on nutrient and zooplankton composition and dynamics. The salt marsh hydrology is determined by a prolonged period of confinement without water inputs, irregularly interrupted by sudden water inputs due to flooding events (sea storms or intense rainfalls). While the dynamics of oxidized nitrogen compounds in the lagoons depends on the water inputs variability within each hydrological cycle, the internal load of phosphorus, total nitrogen and organic matter is related more to the cumulative mechanisms during the confinement periods. Accumulation processes may be easily related to lagoon age, since old lagoons have higher content of nutrients and organic matter, suggesting that these lagoons progressively accumulate nutrients during the successive confinement events. This is the usual case for most Mediterranean salt marshes without an artificially manipulated water regime. The zooplankton community in La Pletera integrates the effects of both the hydrological regime and the lagoon age since the former determines the temporal pattern of the main zooplankton species and the latter explains differences in composition and structure between old and new lagoons.  相似文献