DOI: 10.1111/gcb.13135
论文题名: Changes in seasonal climate outpace compensatory density-dependence in eastern brook trout
作者: Bassar R.D. ; Letcher B.H. ; Nislow K.H. ; Whiteley A.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 2 起始页码: 577
结束页码: 593
语种: 英语
英文关键词: Climate change
; Density-dependence
; Integral projection models
; Metapopulations
; Salmonids
; Size-structure
Scopus关键词: Salmonidae
; Salvelinus fontinalis
; animal
; body size
; climate change
; female
; Massachusetts
; physiology
; population density
; reproduction
; river
; salmonine
; season
; temperature
; theoretical model
; Animals
; Body Size
; Climate Change
; Female
; Massachusetts
; Models, Theoretical
; Population Density
; Reproduction
; Rivers
; Seasons
; Temperature
; Trout
英文摘要: Understanding how multiple extrinsic (density-independent) factors and intrinsic (density-dependent) mechanisms influence population dynamics has become increasingly urgent in the face of rapidly changing climates. It is particularly unclear how multiple extrinsic factors with contrasting effects among seasons are related to declines in population numbers and changes in mean body size and whether there is a strong role for density-dependence. The primary goal of this study was to identify the roles of seasonal variation in climate driven environmental direct effects (mean stream flow and temperature) vs. density-dependence on population size and mean body size in eastern brook trout (Salvelinus fontinalis). We use data from a 10-year capture-mark-recapture study of eastern brook trout in four streams in Western Massachusetts, USA to parameterize a discrete-time population projection model. The model integrates matrix modeling techniques used to characterize discrete population structures (age, habitat type, and season) with integral projection models (IPMs) that characterize demographic rates as continuous functions of organismal traits (in this case body size). Using both stochastic and deterministic analyses we show that decreases in population size are due to changes in stream flow and temperature and that these changes are larger than what can be compensated for through density-dependent responses. We also show that the declines are due mostly to increasing mean stream temperatures decreasing the survival of the youngest age class. In contrast, increases in mean body size over the same period are the result of indirect changes in density with a lesser direct role of climate-driven environmental change. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61490
Appears in Collections: 影响、适应和脆弱性
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作者单位: S.O. Conte Anadromous Fish Research Center, US Geological Survey, Leetown Science Center, Turners Falls, MA, United States; Department of Environmental Conservation, University of Massachusetts, Amherst, MA, United States; Northern Research Station, USDA Forest Service, University of Massachusetts, Amherst, MA, United States
Recommended Citation:
Bassar R.D.,Letcher B.H.,Nislow K.H.,et al. Changes in seasonal climate outpace compensatory density-dependence in eastern brook trout[J]. Global Change Biology,2016-01-01,22(2)