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- Title
Investigating spatial variation and temperature effects on maturity of female winter flounder ( Pseudopleuronectes americanus) using generalized additive models.
- Authors
Winton, Megan V.; Wuenschel, Mark J.; McBride, Richard S.; Chen, Yong
- Abstract
Generalized additive models were used to investigate fine-scale spatial variation in female maturity across the three United States' winter flounder ( Pseudopleuronectes americanus) stocks. The effect of temperature on maturity was also investigated. Maturity models explicitly incorporating spatial structure performed better than 'traditional' methods incorporating spatial effects by aggregating data according to predefined stock boundaries. Models including temperature explained more of the variability in maturity than those based only on fish size or age but did not improve fit over models incorporating spatial structure. Based on the size- and age-at-maturity estimates from the spatially explicit models, distinct subareas were objectively identified using a spatially constrained clustering algorithm. The results suggested greater variation in size- and age-at-maturity within than between existing stock areas. The approach outlined here provides a method for identifying areas with different vital rates without the need to presume subjective boundaries.
- Subjects
UNITED States; SPATIAL variation; WINTER flounder; EFFECT of temperature on fishes; LINEAR statistical models; FISH populations
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2014, Vol 71, Issue 9, p1279
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2013-0617