Oligochaete distribution patterns in two German hardwater lakes of different trophic state   总被引：1，自引：0，他引：1  

Rut Collado  Rüdiger M. Schmelz   《Limnologica》2001,31(4):317-328

We investigated the effect of contrasting trophic conditions on the distribution and dominance patterns of Oligochaeta species assemblages in lake sediments and their relation to the environmental variables depth, season, and substrate. The study was performed on the highly eutrophic Lake Haussee and the oligotrophic Lake Stechlin, both hardwater lakes in the Baltic Lake District of Northern Germany. Quantitative monthly and seasonal sampling took place over one year at 14 representative sites, covering littoral and profundal sediments of both lakes. Between-lake differences in the profundal were clearcut with an absence of any zoobenthos in Lake Haussee and a peculiar meiobenthic species assemblage in Lake Stechlin (Collado et al. 1999). Between-lake differences in the littoral, however, were small and mainly attributable to a small number of species exclusive to Lake Stechlin and an overall higher abundance of oligochaetes, especially naidids, in Lake Haussee. Species-richest family in both lakes were Naididae; Tubificidae were dominant in Lake Stechlin; in Lake Haussee Tubificidae and Naididae were equally abundant. Most striking were diversity of habitat types and species distribution patterns in the littoral. Multivariate analysis (CA, CCA) showed that the distribution patterns of oligochaete species assemblages are significantly correlated with depth, season and substrate. Depth is the major factor when the whole water body is considered. When confining to the littoral, species abundance and distribution are strongly related to seasonality and substrate type. Naididae show, in general, maximal abundances in autumn and summer and a preference for plants, plant debris and soft sediments; Tubificidae are more abundant in spring and prefer mineral substrate. The relation between seasonality, substrate and food availability is discussed.  相似文献   

湖泊水质预测模型的建立及其应用     

万幼川  李植生  梁小民  刘良明 《武汉大学学报(信息科学版)》1996,(4)

根据东湖多年监测数据分析，建立了多元相关预测模型、基于灰色理论灰色系统的预测模型和质量平衡模型。为了提高灰色预测精度，利用残差对模型进行了相应的修正，并利用３种模型对影响东湖水质主要因子——经济、人口、ＢＯＤ、ＣＯＤ、ＴＮ、ＴＰ进行了２０００年的预测，提出了东湖污染防治对策  相似文献   

Projective ordination by SIMCA: A dynamic strategy for cost-efficient environmental monitoring around offshore installations     

Bernard G. J. Massart  Olav M. Kvalheim  Fred Olav Libnau  Karl I. Ugland  Kjell Tjessem  Karl Bryne 《Aquatic Sciences - Research Across Boundaries》1996,58(2):120-138

A method for environmental monitoring using benthic species profiles as input is developed in this work. The method, referred to as projective ordination, utilises local principal component modelling (SIMCA) to obtain a cross-validated model which spans the natural variation in a region around offshore oil-producing installations. The borderline between regions with disturbed and non-disturbed species communities is subsequently decided from the residual distribution. This distribution is used to design an approximate F-test for assessing whether a community at a particular sampling location is disturbed or not. If so, the nature of the disturbance is determined by projecting the data on the PC model.Projective ordination utilises information from previous surveys to define the permissible variation in species communities, i.e. the limit of the natural variation. In addition, the method is dynamic, in a sense that the sampling locations may vary from survey to survey.Furthermore, our analysis shows that the customary number of replicate samples per station can be reduced. Modelling with only four randomly chosen replicates out of the complete set of five for each sampling location, does not affect the model significantly. On the other hand, taking only 3 replicates into account leads to significant divergences.A model based on the 1990 and 1993 surveys at the Statfjord field is presented as an example of the technique.  相似文献   

Multivariate analysis of aquatic toxicity data with PLS   总被引：2，自引：0，他引：2  

Lennart Eriksson  Joop L. M. Hermens  Erik Johansson  Henk J. M. Verhaar  Svante Wold 《Aquatic Sciences - Research Across Boundaries》1995,57(3):217-241

  相似文献   

Environmental variability in the North Atlantic and Iberian waters and its influence on horse mackerel (Trachurus trachurus) and albacore (Thunnus alalunga) dynamics     

Lavin  Alicia; Moreno-Ventas  Xabier; Ortiz de Zarate  Victoria; Abaunza  Pablo; Cabanas  Jose Manuel 《ICES Journal of Marine Science》2007,64(3):425-438

  相似文献   

Dynamics of fisheries, and the flexibility of vessel activity in Denmark between 1989 and 2001   总被引：1，自引：1，他引：1  

Ulrich  Clara; Andersen  Bo Solgaard 《ICES Journal of Marine Science》2004,61(3):308-322

  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   

The plankton of a shallow submarine cave ('Grotta di Ciolo', Salento Peninsula, SE Italy)     

Salvatore Moscatello  & Genuario Belmonte 《Marine Ecology》2007,28(S1):47-59

  相似文献   

复合极值分布理论及其工程应用   总被引：1，自引：2，他引：1  

刘德辅  王莉萍  宋艳  庞亮 《中国海洋大学学报(自然科学版)》2004,34(5):893-902

复合极值分布理论在国际上公开发表以来得到了国内外的大量引用和应用。本文就该理论由一维拓宽至多维进行了理论论述 ,并对其不同模式在海岸、海洋和水利工程中的应用做了实例计算。  相似文献   

Distribution of Biological Activity in the Lower St Lawrence Estuary as Determined by Multivariate Analysis     

Savenkoff C.  Chanut J. -P.  Vzina A. F.  Gratton Y. 《Estuarine, Coastal and Shelf Science》1995,40(6)

Three stations located in the Laurentian Trough were investigated three times during the summer production maximum (in June-July 1990; COUPPB90-1 cruise). A range of multivariate analyses was carried out to extract major physical-biological features in a large data set covering the whole cruise. This study presents the advantages of combining conventional principal component analysis (PCA) with a three-way data analysis. PCA provides the centre of gravity of the different locations for each variable and each sample during the cruise without temporal information. Three-way data analysis produces the trajectory of the different site/time locations for each variable and each sample, and clarifies spatial and temporal relationships between variables. The results reproduce the main patterns of the lower St Lawrence Estuary during the summer plankton bloom and indicate an upstream movement of warm and less saline waters associated with surface production. Apparently these large changes at the surface are not reflected in the deeper layers. Cluster analysis suggests that autotrophic and heterotrophic activities are decoupled when production is low and are correlated only when production increases.  相似文献