Abstract:
:The ability of natural selection to drive local adaptation has been appreciated ever since Darwin. Whether human impacts can impede the adaptive process has received less attention. We tested this hypothesis by quantifying natural selection and harvest selection acting on a freshwater fish (pike) over four decades. Across the time series, directional natural selection tended to favour large individuals whereas the fishery targeted large individuals. Moreover, non-linear natural selection tended to favour intermediate sized fish whereas the fishery targeted intermediate sized fish because the smallest and largest individuals were often not captured. Thus, our results unequivocally demonstrate that natural selection and fishery selection often acted in opposite directions within this natural system. Moreover, the two selective factors combined to produce reduced fitness overall and stronger stabilizing selection relative to natural selection acting alone. The long-term ramifications of such human-induced modifications to adaptive landscapes are currently unknown and certainly warrant further investigation.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Carlson SM,Edeline E,Asbjørn Vøllestad L,Haugen TO,Winfield IJ,Fletcher JM,Ben James J,Stenseth NCdoi
10.1111/j.1461-0248.2007.01046.xsubject
Has Abstractpub_date
2007-06-01 00:00:00pages
512-21issue
6eissn
1461-023Xissn
1461-0248pii
ELE1046journal_volume
10pub_type
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