Environmental extremes drive population structure at the northern range limit of Atlantic salmon in North America

2018 ◽  
Vol 27 (20) ◽  
pp. 4026-4040 ◽  
Author(s):  
Emma V. A. Sylvester ◽  
Robert G. Beiko ◽  
Paul Bentzen ◽  
Ian Paterson ◽  
John B. Horne ◽  
...  
Keyword(s):  
Population Structure ◽  
North America ◽  
Atlantic Salmon ◽  
Range Limit ◽  
Environmental Extremes ◽  
Northern Range Limit

Green Turtles Nesting at Their Northern Range Limit in the United States Represent a Distinct Subpopulation

2018 ◽  
Vol 17 (2) ◽  
pp. 314 ◽  
Author(s):  
Brian M. Shamblin ◽  
Matthew H. Godfrey ◽  
S. Michelle Pate ◽  
William P. Thompson ◽  
Hope Sutton ◽  
...  
Keyword(s):  
United States ◽  
The United States ◽  
Range Limit ◽  
Green Turtles ◽  
Distinct Subpopulation ◽  
Northern Range Limit

Multilocus phylogeography and population structure of common eiders breeding in North America and Scandinavia

2011 ◽  
Vol 38 (7) ◽  
pp. 1368-1380 ◽  
Author(s):  
Sarah A. Sonsthagen ◽  
Sandra L. Talbot ◽  
Kim T. Scribner ◽  
Kevin G. McCracken
Keyword(s):  
Population Structure ◽  
North America ◽  
Common Eiders

Breeding behaviour of ectotherms at high latitudes: the case of the natterjack toad Epidalea calamita at its northern range limit

Behaviour ◽  
2021 ◽  
pp. 1-20
Author(s):  
Linda Saare ◽  
Riinu Rannap
Keyword(s):  
Climatic Conditions ◽  
Energetic Cost ◽  
Breeding Period ◽  
High Latitudes ◽  
Range Limit ◽  
Photo Identification ◽  
Breeding Behaviour ◽  
Risk Of Predation ◽  
Increased Risk ◽  
Northern Range Limit

Abstract We explored the breeding behaviour of a threatened amphibian, the natterjack toad, at its northern range limit in Estonia, to determine the extent to which reproduction is affected by harsh and unstable climatic conditions. Using photo identification of specimens, we found that in optimal weather conditions males formed three breeding cohorts, while in adverse conditions only a single cohort occurred and under extreme conditions reproduction was skipped entirely. During the extended breeding season, larger males participated in reproduction throughout the breeding period, while smaller males appeared in later cohorts. Breeding success was related to the calling effort of a male, where larger males had greater mating success than smaller ones. We found that the natterjack toad males exhibit significant plasticity in reproductive behaviour at the northern range limit, which, given the energetic cost of reproduction and the increased risk of predation, allows them to increase their fitness at high latitudes.

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