四川岳池龙潭期地层及腕足动物   总被引：1，自引：0，他引：1  

曾勇 《地层学杂志》1996,20(1):35-39

首次系统地报道了四川华蓥山地区岳池县李子垭剖面中的龙潭组地层及其腕足动物群,并对该腕足动物群的性质和特点进行了定量和定性分析。同时,与国内其它有关地区的同期的腕足动物群进行对比、讨论,指出该动物群为华南区晚二叠世早期比较典型的腕足动物群。  相似文献   

连云港疏浚工程对底栖动物影响的调查研究     

陈德昌  唐寅德  张勇  马宏广 《海洋科学进展》1991,(3)

由于港口扩建工程,连云港地区每年有数百万立方米的泥土集中排抛于局部海域。废弃土在排抛区内形成淤积并影响着底栖动物的栖息环境。作者于1986年和1988年在连云港海域进行了底栖动物采样,调查得出了生物量和栖息密度的分布概况。结果表明:疏浚工程影响着底栖动物的生存,但其影响范围是局部的。  相似文献   

头足类的分布特点及其区系特征     

董正之 《海洋科学进展》1992,(4)

本文以世界海域头足类的28个科及其重要种类的分布为依据,结合生境、生态和捕获状况,探讨了头足类的分布特点、分布趋向和区系特征。  相似文献   

Benthic Communities of the lnfralittoral in the N. Sporades (Aegean Sea): a Variety of Biotopes Encountered and Analysed     

N. Simboura  A. Zenetos  M. Thessalou-Legaki  M.-A. Pancucci  A. Nicolaidou 《Marine Ecology》1995,16(4):283-306

Abstract. The infralittoral benthos was studied on three islands of the Northern Sporades in the Aegean Sea. Thirteen stations were sampled on both hard and soft substrata and 408 taxa were identified, some of zoogeographical interest. Multivariate statistical methods such as classification, ordination and Similarilies Terms Analysis were combined with existing ecological information to delineate the various communities present and to point to the indicator species characterising them. The communities were then defined using the indicator species and their affinities to typical biocoenoses. The main factor responsible for the observed distribution proved to be the type of substratum (algal cover or sediment type), which reflects the light and hydrodynamic conditions. The observed bathynietric zonation was similar lo that of the Balearic Islands in the western Mediterranean.  相似文献   

Size partitioning of microbial and meiobenthic biomass and respiration on Brown's Bank, south-west Nova Scotia     

Jonathan Grant  Peter Schwinghamer 《Estuarine, Coastal and Shelf Science》1987,25(6)

Biomass and respiration (oxygen consumption) of bacteria, microfauna, and meiofauna were measured in coarse sand sediment from Brown's Bank (172 m) off Nova Scotia, Canada. Community biomass, excluding macrofauna, had a median value of 35 mg C m⁻², dominated by bacteria (51%), microfauna (25%), and a minor meiofauna component (2·5%). Protozoan microfauna were mostly microflagellates (colourless cryptomonads). The experimental design allowed partitioning of benthic metabolism without using subtraction from whole community rates. Addition-removal experiments with fauna separated into size categories were used to construct a respiration-biomass regression for all taxa. Respiration rates for faunal groups were then calculated from their biomass in the natural sediment. Total microbial and meiofaunal community respiration had a median rate of 0·55 ml O₂ m⁻² h⁻¹ which was partitioned into median proportions of bacteria (50%) microflagellates (27%), and metazoan meiofauna (4%). Correlations among faunal biomass values from incubated vials of sediment suggested that bacteria were important prey for protozoans. With added biomass of meiofauna, protozoans also became a potentially important source of prey. The results demonstrated the significance of microflagellate protozoans in these sediments and their metabolic and trophic importance relative to meiofauna and even bacteria.  相似文献   

南海南部1百万年以来的放射虫动物群特征   总被引：3，自引：1，他引：3  

杨丽红  陈木宏  王汝建  陆钧  郑范 《热带海洋学报》2003,22(5):8-15

定量分析了ODP184航次1143站岩心中的117个放射虫样品，得出南海南部1MaB．P．以来地层中的放射虫动物群特征如下：自1MaB．P．以来放射虫的数量分布丰度值呈现由低到高的变化趋势，并具有规律性的旋回特征，体现了1MaB．P．以来该海区放射虫动物群由贫乏向繁盛的逐步演化过程，以及海洋环境的几个阶段性变化。放射虫属种组成呈现明显的热带暖水动物群的组合面貌，优势种的组成与南海中北部海区及其它低纬度大洋相比存在一定差异，体现了该海区独特的放射虫组成特征。此外，指示温度的特征种在1MaB．P．来地层中的分布也显示了热带、亚热带海区放射虫的特殊指示作用。  相似文献   

Macrofauna associated to Mycale microsigmatosa (Porifera, Demospongiae) in Rio de Janeiro State, SE Brazil     

Suzi M. Ribeiro  Elianne P. Omena  Guilherme Muricy   《Estuarine, Coastal and Shelf Science》2003,57(5-6):951-959

The macrofauna (endo- and epi-biotic) associated to the sponge Mycale (Carmia) microsigmatosa Arndt, 1927 was studied at three sites in Rio de Janeiro State, Brazil (Arraial do Cabo, Niterói, and Rio de Janeiro). A total of 2235 individuals (over 1 mm long) of 75 invertebrate species were found associated to 19 specimens of the sponge. The most abundant and diverse taxa were the crustaceans (83%, 31 spp.), polychetes (10%, 18 spp.), and molluscs (3.7%, 15 spp.). Cnidarians, platyhelminthes, ascidians, echinoderms, pycnogonids, bryozoans, and sponges were also represented. Amphipod crustaceans were the dominant group, comprising 61% of all individuals collected. Species richness and abundance of associated fauna were highly correlated with sponge volume, but diversity and evenness were not. The site of collection influenced the species composition of the fauna associated to M. microsigmatosa but did not change significantly its diversity, abundance, richness, and dominance patterns of higher taxa. Pregnant females and juvenile stages of 29% of the species associated, including crustaceans, molluscs, echinoderms, and pycnogonids were frequently found inside M. microsigmatosa. Although many of these organisms do occur and reproduce in other habitats outside the sponge as well, M. microsigmatosa is also important for their reproduction and survivorship, thus contributing for the maintenance of biodiversity in Southwestern Atlantic sublittoral rocky shores.  相似文献   

Fish Assemblages in Shallow Marine Caves of the Salento Peninsula (Southern Apulia, SE Italy)   总被引：1，自引：0，他引：1  

Simona Bussotti  Francesco Denitto  Paolo Guidetti  Genuario Belmonte 《Marine Ecology》2002,23(S1):11-20

Abstract. Fish assemblages of three shallow marine caves from the Salento Peninsula (Apulia, SE Italy) were investigated in July 2000. Data were collected in situ by using visual census. A total of nineteen fish species were recorded inside the caves. The species richness generally displayed a similar pattern in all three caves, decreasing from the entrance towards the innermost sections, whereas the patterns of total fish abundance differed among caves. Apogon imberbis (mainly represented by juveniles) was the most important species in terms of number of individuals (accounting for more than 85% of the censused fish) and showed a fairly even distribution inside the investigated caves. Without the numerical contribution of A. imberbis , fish abundance decreased from the entrance to the inner sections and this pattern was common to all three caves. Juvenile fishes of economic interest ( e. g., Diplodus vulgaris and Epinephelus marginatus ) were also recorded inside. The present study suggests that: (1) environmental constraints could affect distribution patterns in fish species richness and in the abundance of several fish along the axis of "blind caves" (with a single entrance), as already observed for sessile benthos and plankton assemblages; (2) shallow marine caves of the Salento Peninsula could exert the role of refuge and/or nursery for some littoral fish species during the adult and/or juvenile stages of their life histories.  相似文献   

Sunken wood from the Vanuatu Islands: identification of wood substrates and preliminary description of associated fauna   总被引：1，自引：0，他引：1  

Marie Pailleret  Takuma Haga  Patricia Petit  Catherine Privé-Gill  Nima Saedlou  Françoise Gaill  & Magali Zbinden 《Marine Ecology》2007,28(1):233-241

  相似文献   

新发现的周口店晚更新世洞穴地层及哺乳动物群研究     

田明中  曹伯勋  袁铃声  赵志中  陈莲芳  涂丽娟 《海洋地质与第四纪地质》1994,(1)

本文依据新发现的晚更新世洞穴地层剖面，进行了年代学及哺乳动物化石方面的研究。年代学综合测定结果为距今１２～１．９万年，这是周口店地区迄今发现的最为完整的晚更新世洞穴地层剖面，根据堆积物中所含的哺乳动物化石特征，进行了生态、种类方面的研究，建立了一个新的哺乳动物群─—东岭子动物群。  相似文献