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Selection: Krebs:CJ [4 articles] 

Publications by author Krebs:CJ.

Population regulation in snowshoe hare and Canadian lynx: asymmetric food web configurations between hare and lynx

Proceedings of the National Academy of Sciences, Vol. 94, No. 10. (13 May 1997), pp. 5147-5152


The snowshoe hare and the Canadian lynx in the boreal forests of North America show 9- to 11-year density cycles. These are generally assumed to be linked to each other because lynx are specialist predators on hares. Based on time series data for hare and lynx, we show that the dominant dimensional structure of the hare series appears to be three whereas that of the lynx is two. The three-dimensional structure of the hare time series is hypothesized to be due ...


Impact of food and predation on the snowshoe hare cycle

Science, Vol. 269, No. 5227. (25 August 1995), pp. 1112-1115,


Snowshoe hare populations in the boreal forests of North America go through 10-year cycles. Supplemental food and mammalian predator abundance were manipulated in a factorial design on 1-square-kilometer areas for 8 years in the Yukon. Two blocks of forest were fertilized to test for nutrient effects. Predator exclosure doubled and food addition tripled hare density during the cyclic peak and decline. Predator exclosure combined with food addition increased density 11-fold. Added nutrients increased plant growth but not hare density. Food and ...


Newly discovered landscape traps produce regime shifts in wet forests

Proceedings of the National Academy of Sciences, Vol. 108, No. 38. (20 September 2011), pp. 15887-15891,


We describe the “landscape trap” concept, whereby entire landscapes are shifted into, and then maintained (trapped) in, a highly compromised structural and functional state as the result of multiple temporal and spatial feedbacks between human and natural disturbance regimes. The landscape trap concept builds on ideas like stable alternative states and other relevant concepts, but it substantively expands the conceptual thinking in a number of unique ways. In this paper, we (i) review the literature to develop the concept of landscape ...


Archiving primary data: solutions for long-term studies

Trends in Ecology & Evolution, Vol. 30, No. 10. (2015), pp. 581-589,


The recent trend for journals to require open access to primary data included in publications has been embraced by many biologists, but has caused apprehension amongst researchers engaged in long-term ecological and evolutionary studies. A worldwide survey of 73 principal investigators (Pls) with long-term studies revealed positive attitudes towards sharing data with the agreement or involvement of the PI, and 93% of PIs have historically shared data. Only 8% were in favor of uncontrolled, open access to primary data while 63% ...

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