Title

Understanding How Lake Populations of Arctic Char are Structured and Function with Special Consideration of the Potential Effects of Climate Change: a Multi-Faceted Approach

Document Type

Article

Journal/Book Title/Conference

Oecologia

Volume

176

Issue

1

Publication Date

2014

First Page

81

Last Page

94

Abstract

Size dimorphism in fish populations, both its causes and consequences, has been an area of considerable focus; however, uncertainty remains whether size dimorphism is dynamic or stabilizing and about the role of exogenous factors. Here, we explored patterns among empirical vital rates, population structure, abundance and trend, and predicted the effects of climate change on populations of arctic char (Salvelinus alpinus) in two lakes. Both populations cycle dramatically between dominance by small (≤300 mm) and large (>300 mm) char. Apparent survival (Φ) and specific growth rates (SGR) were relatively high (40–96 %; SGR range 0.03–1.5 %) and comparable to those of conspecifics at lower latitudes...

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