scholarly journals Spatio-temporal variation in European starling reproductive success at multiple small spatial scales

2015 ◽  
Vol 5 (16) ◽  
pp. 3364-3377 ◽  
Author(s):  
Daisy Brickhill ◽  
Peter G.H. Evans ◽  
Jane M. Reid
Keyword(s):  
Reproductive Success ◽  
Temporal Variation ◽  
Spatial Scales ◽  
European Starling ◽  
Spatio Temporal

Estimating synchronous changes in condition and density in eastern Bering Sea fishes

2020 ◽  
Vol 635 ◽  
pp. 169-185 ◽  
Author(s):  
A Grüss ◽  
J Gao ◽  
JT Thorson ◽  
CN Rooper ◽  
G Thompson ◽  
...  
Keyword(s):  
Spatial Variation ◽  
Temporal Variation ◽  
Density Dependence ◽  
Bering Sea ◽  
Spatial Scales ◽  
Relative Weight ◽  
Bottom Temperature ◽  
Fish Condition ◽  
Eastern Bering Sea ◽  
Spatio Temporal

Estimating fish condition, the relative weight of an individual fish given its body length, is a convenient way to relate the physiological health and energetic status of fishes to their productivity. Despite evidence of density-dependence effects on condition in some species, previous research has not jointly estimated synchronous changes in condition and density operating at fine spatial scales (a few km). Therefore, we developed a spatio-temporal modeling approach that simultaneously estimates correlated variation in density (measured as numbers per area) and condition. We applied our approach to 6 eastern Bering Sea (EBS) groundfish species (4 flatfishes and 2 gadoids) for the period 1992-2016, and estimated correlations in spatial variation (unmeasured variation that is stable over time) and spatio-temporal variation (unmeasured variation that changes between years). Spatial variation in density had a strong significant negative association with spatial variation in condition for 3 flatfishes and a positive association for one gadoid. Spatio-temporal variation in density had a significant association with spatio-temporal variation in condition for one flatfish (negative) and one gadoid (positive). Moreover, for the 6 study species, bottom temperature was identified as an important predictor of both density and condition. The increasing trend in bottom temperatures between 1992 and 2016 was accompanied by an overall increase in the abundance-weighted condition of 5 species. We conclude that forecasts of changes in weight-at-age within some EBS groundfish assessments will require an understanding of both density-dependence and bottom temperature effects on fish condition to better prepare for future climate and exploitation changes.

Spatio-temporal Variation Characteristics of Surface Net Radiation in China over the Past 50 Years

2013 ◽  
Vol 15 (1) ◽  
pp. 1 ◽  
Author(s):  
Yangzi GAO ◽  
Honglin HE ◽  
Li ZHANG ◽  
Qianqian LU ◽  
Guirui YU ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Net Radiation ◽  
The Past ◽  
Variation Characteristics ◽  
Spatio Temporal
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