An Experimental Analysis of Biological Factors Contributing to Stream Community Structure

Ecology ◽  
1980 ◽  
Vol 61 (6) ◽  
pp. 1283-1290 ◽  
Author(s):  
Barbara L. Peckarsky ◽  
Stanley I. Dodson
Keyword(s):  
Community Structure ◽  
Experimental Analysis ◽  
Biological Factors ◽  
Stream Community

Macroinvertebrate Communities and Environment in a Southern African Mountain Stream

1988 ◽  
Vol 45 (12) ◽  
pp. 2168-2181 ◽  
Author(s):  
J. M. King ◽  
J. A. Day ◽  
P. R. Hurly ◽  
M-P. Henshall-Howard ◽  
B. R. Davies
Keyword(s):  
Community Structure ◽  
Environmental Variables ◽  
Mediterranean Ecosystems ◽  
Mountain Stream ◽  
Functional Feeding Groups ◽  
Stepwise Discriminant Analysis ◽  
Macroinvertebrate Communities ◽  
Strong Correlations ◽  
Stream Community ◽  
Community Changes

In a study of a second-order southern African stream, complementary classification and multidimensional scaling (MDS) techniques revealed longitudinal changes in macroinvertebrate community structure, but no temporal changes. Stepwise discriminant analysis and multiple linear regression were used to identify environmental variables correlated with the community changes but produced conflicting results depending on the information used, possibly because of strong correlations between some of the variables. The MDS plot of biotic samples illustrated that potassium levels correlated most strongly with community distribution. Because of the large number of variables now shown worldwide to correlate with faunal distributions, we suggest ways to choose the variables to suit the kind of study to be undertaken. Attempts to assign the invertebrates to functional feeding groups (FFGs) were unsatisfactory as the relevant categories are poorly defined and often inadequate for classifying the fauna. We suggest that until these categories are more clearly defined, and more uniformly applied, concepts relating to FFGs cannot be tested satisfactorily. The stream community in Langrivier is more similar to communities found in two other mediterranean ecosystems than to those in other southern African rivers, probably because of the greater predictability of flow in the former.

scholarly journals Experimental evidence that predator range expansion modifies alpine stream community structure

2015 ◽  
Vol 34 (1) ◽  
pp. 66-80 ◽  
Author(s):  
K. Khamis ◽  
L. E. Brown ◽  
D. M. Hannah ◽  
A. M. Milner
Keyword(s):  
Community Structure ◽  
Experimental Evidence ◽  
Range Expansion ◽  
Stream Community ◽  
Alpine Stream

scholarly journals Chaetognath assemblages along the Pacific Coast and adjacent inland waters of the Philippines: relative importance of oceanographic and biological factors

2012 ◽  
Vol 69 (3) ◽  
pp. 410-420 ◽  
Author(s):  
Mary Mar P. Noblezada ◽  
Wilfredo L. Campos
Keyword(s):  
Community Structure ◽  
Pacific Coast ◽  
Mass Movement ◽  
The Philippines ◽  
Inland Waters ◽  
Relative Importance ◽  
Biological Factors ◽  
Comprehensive Information ◽  
The Pacific ◽  
Plankton Distribution

Abstract Noblezada, M. M. P., and Campos, W. L. 2012. Chaetognath assemblages along the Pacific Coast and adjacent inland waters of the Philippines: relative importance of oceanographic and biological factors. – ICES Journal of Marine Science, 69: 410–420. When studying plankton distribution, it is necessary to investigate the biology of the target organisms and the surrounding physical environment. Station and species groupings are only useful if they provide insight into the environmental associations of the species in the group. The study covers two geographic regions: the Pacific Coast (Bicol Shelf) and inland waters (San Bernardino Strait, Ticao Pass, Sibuyan, and Visayan Seas) of the Philippines. Comprehensive information is provided on chaetognath assemblages and distribution within the regions. The findings are integrated with oceanographic conditions and phenomena that define the characteristics of the subareas and consideration given to how these conditions affect chaetognath ecology. A comparison is also provided of the community structure of the two regions, and the possible use of chaetognaths as indicator species of water mass movement and oceanographic phenomena explored. In all, 28 284 specimens were examined, and 33 species from 17 genera were identified. Chaetognath distributions, abundance, and community structure were analysed using dissimilarity indices and multiple regression. The results show that the distribution of chaetognaths agrees well with the movement of oceanic water from the Pacific into the central part of the archipelago.

Trophic trickles and cascades in a complex food web: impacts of a keystone predator on stream community structure and ecosystem processes

Oikos ◽  
2008 ◽  
Vol 117 (5) ◽  
pp. 683-692 ◽  
Author(s):  
Guy Woodward ◽  
Georgia Papantoniou ◽  
François Edwards ◽  
Rasmus B. Lauridsen
Keyword(s):  
Community Structure ◽  
Food Web ◽  
Ecosystem Processes ◽  
Keystone Predator ◽  
Stream Community
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