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Surviving winter: Food, but not habitat structure, prevents crashes in cyclic vole populations

Johnsen, Kaja; Boonstra, Rudy; Boutin, Stan; Devineau, Olivier; Krebs, Charles J.; Andreassen, Harry Peter
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2425473
Date
2016
Metadata
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  • Artikkel - fagfellevurdert vitenskapelig / Articles - peer-reviewed [3067]
Original version
10.1002/ece3.2635
Abstract
Vole

population

cycles

are a major

force

driving

boreal

ecosystem

dynamics

in north

-

western

Eurasia.

However,

our understanding

of the impact

of winter

on these

cycles

is increasingly

uncertain,

especially

because

climate

change

is affecting

snow

predict

-

ability,

quality,

and

abundance.

We

examined

the role

of winter

weather

and

snow

conditions,

the lack

of suitable

habitat

structure

during

freeze-

thaw

periods,

and

the

lack

of sufficient

food

as potential

causes

for winter

population

crashes.

We

live-

trapped

bank

voles

Myodes glareolus

on 26 plots

(0.36 ha

each)

at two

different

eleva

-

tions

(representing

different

winter

conditions)

in southeast

Norway

in the winters

2013/2014

and

2014/2015.

We

carried

out two

manipulations:

supplementing

six

plots

with

food

to eliminate

food

limitation

and six plots

with

straw

to improve

habitat

structure

and limit

the effect

of icing

in the subnivean

space.

In the first

winter,

all bank

voles

survived

well

on all plots,

whereas

in the second

winter

voles

on almost

all plots

went

extinct

except

for those

receiving

supplemental

food.

Survival

was

highest

on the

feeding

treatment

in both

winters,

whereas

improving

habitat

structure

had no effect.

We conclude

that

food

limitation

was a key factor

in causing

winter

population

crashes.
Publisher
Wiley
Journal
Ecology and evolution

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