Large scale patterns in the diversity of lake fish assemblages in China and the effect of environmental factors

2016 ◽  
Vol 188 (2) ◽  
pp. 129-145 ◽  
Author(s):  
Chuanbo Guo ◽  
Yushun Chen ◽  
Sovan Lek ◽  
Zhongjie Li
Keyword(s):  
Environmental Factors ◽  
Large Scale ◽  
Fish Assemblages ◽  
Lake Fish

Size spectra of lake fish assemblages: responses along gradients of general environmental factors and intensity of lake-use

2011 ◽  
Vol 56 (11) ◽  
pp. 2316-2333 ◽  
Author(s):  
MATTHIAS EMMRICH ◽  
SANDRA BRUCET ◽  
DAVID RITTERBUSCH ◽  
THOMAS MEHNER
Keyword(s):  
Environmental Factors ◽  
Fish Assemblages ◽  
Size Spectra ◽  
Lake Fish

Species Responses to Grazing and Environmental-Factors in an Arid Halophytic Shrubland Community

1987 ◽  
Vol 35 (2) ◽  
pp. 135 ◽  
Author(s):  
RB Hacker
Keyword(s):  
Environmental Factors ◽  
Soil Salinity ◽  
Large Scale ◽  
Chemical Properties ◽  
Grazing Pressure ◽  
Aerial Photographs ◽  
Small Scale ◽  
Factors Affecting ◽  
Species Responses

Species responses to grazing and environmental factors were studied in an arid halophytic shrubland community in Western Australia. The grazing responses of major shrub species were defined by using reciprocal averaging ordination of botanical data, interpreted in conjunction with a similar ordination of soil chemical properties and measures of soil erosion derived from large-scale aerial photographs. An apparent small-scale interaction between grazing and soil salinity was also defined. Long-term grazing pressure is apparently reduced on localised areas of high salinity. Environmental factors affecting species distribution are complex and appear to include soil salinity, soil cationic balance, geomorphological variation and the influence of cryptogamic crusts on seedling establishment.

Associations between fish assemblages and environmental factors for Mediterranean-type rivers during summer

2006 ◽  
Vol 69 (5) ◽  
pp. 1552-1569 ◽  
Author(s):  
R. Morán-López ◽  
E. Da Silva ◽  
J. L. Pérez-Bote ◽  
C. Corbacho Amado
Keyword(s):  
Environmental Factors ◽  
Fish Assemblages

Relationship Between Prevalence of Childhood Obesity in 17-Year-Olds and Socioeconomic and Environmental Factors

2011 ◽  
Vol 25 (2) ◽  
pp. 159-169 ◽  
Author(s):  
Rie Sakai
Keyword(s):  
Childhood Obesity ◽  
Environmental Factors ◽  
Large Scale ◽  
Traffic Accidents ◽  
University Education ◽  
Annual Reports ◽  
Inverse Association ◽  
Passenger Cars ◽  
Neighborhood Level ◽  
College Or University

To investigate the association between childhood obesity and neighborhood-level socio-economic and environmental factors in Japan. The prevalence of childhood obesity in 2008 was obtained from annual reports of the School Health Survey. The following 12 factors were publicly available: income per person, ratio of people completing up to college or university education, population density, total length of roads per square kilometer, number relative to the population of food and drink stores, restaurants, large-scale retail stores, convenience stores, passenger cars, traffic accidents, criminal offenses, and death by accidents. The ratio of people completing up to college or university education was inversely associated with obesity in boys and girls. No association was found between obesity and the other factors examined. An inverse association was shown between educational level and childhood obesity in both boys and girls. Further studies integrating associations between childhood obesity and neighborhood-level factors are needed.

scholarly journals Catch-per-unit-effort and size spectra of lake fish assemblages reflect underlying patterns in ecological conditions and anthropogenic activities across regional and local scales

2016 ◽  
Vol 73 (4) ◽  
pp. 535-546 ◽  
Author(s):  
Cindy Chu ◽  
Nigel P. Lester ◽  
Henrique C. Giacomini ◽  
Brian J. Shuter ◽  
Donald A. Jackson
Keyword(s):  
Body Size ◽  
Fish Assemblages ◽  
Anthropogenic Activities ◽  
Ecological Indicators ◽  
Size Spectrum ◽  
Catch Per Unit Effort ◽  
Ecological Processes ◽  
Boosted Regression Tree ◽  
Unit Effort ◽  
Lake Fish

Across broad geographic scales, ecological indicators for fish assemblages should represent causal ecological processes, be sensitive enough to show patterns across the landscape, and reflect underlying biotic or abiotic conditions that influence those patterns. We assessed the responses of commonly applied ecological indicators for lake fish assemblages (mean body size, catch-per-unit-effort (CPUE), and normalized length size spectrum (NLSS) slope) to regional (climate, water chemistry, and watershed stress due to human activities) and local (lake morphometry, water quality, and angling pressure) ecological and anthropogenic variables. The indicators were estimated using fish assemblage catch data acquired via a standardized gillnetting protocol implemented within 693 lakes in Ontario, Canada. To our knowledge, our study is the first size-based or catch-based indicator evaluation to include detailed observations of angling pressure on hundreds of inland lakes. Boosted regression tree models showed that CPUE of large-bodied organisms and NLSS slope best described underlying patterns in the regional and local variables. Models developed with a mix of regional and local variables performed better than models developed with regional or local variables alone. The relative influences of the variables and responses varied among indicators, but in general, ecological variables had greater influence on the indicators than anthropogenic variables. These results emphasize the complex and multiscaled nature of factors and ecological processes affecting body size, habitat-community production, and trophic dynamics in lake fish assemblages.

Freshwater fishes of northern Australia

Zootaxa ◽  
2017 ◽  
Vol 4253 (1) ◽  
pp. 1 ◽  
Author(s):  
BRADLEY J. PUSEY ◽  
DAMIEN W. BURROWS ◽  
MARK J. KENNARD ◽  
COLTON N. PERNA ◽  
PETER J. UNMACK ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Conservation Planning ◽  
Information Sources ◽  
Fish Assemblages ◽  
Spatial Arrangement ◽  
Freshwater Fishes ◽  
Ecological Condition ◽  
Northern Australia ◽  
Field Surveys ◽  
Freshwater Habitats

Northern Australia is biologically diverse and of national and global conservation signicance. Its ancient landscape contains the world’s largest area of savannah ecosystem in good ecological condition and its rivers are largely free-flowing. Agriculture, previously confined largely to open range-land grazing, is set to expand in extent and to focus much more on irrigated cropping and horticulture. Demands on the water resources of the region are thus, inevitably increasing. Reliable information is required to guide and inform development and help plan for a sustainable future for the region which includes healthy rivers that contain diverse fish assemblages. Based on a range of information sources, including the outcomes of recent and extensive new field surveys, this study maps the distribution of the 111 freshwater fishes (excluding elasmobranches) and 42 estuarine vagrants recorded from freshwater habitats of the region. We classify the habitat use and migratory biology of each species. This study provides a comprehensive assessment of the diversity and distribution of fishes of the region within a standardised nomenclatural framework. In addition, we summarise the outcomes of recent phylogeographic and phylogenetic research using molecular technologies to identify where issues of taxonomy may need further scrutiny. The study provides an informed basis for further research on the spatial arrangement of biodiversity and its relationship to environmental factors (e.g. hydrology), conservation planning and phylogentic variation within individual taxa. 

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