Pekka Helle
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Explore the profile of Pekka Helle including associated specialties, affiliations and a list of published articles.
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Articles
12
Citations
153
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0
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Recent Articles
1.
Melin M, Mehtatalo L, Helle P, Ikonen K, Packalen T
Sci Rep
. 2020 Apr;
10(1):6987.
PMID: 32332914
Climate change has influenced a range of species across the globe. Yet, to state a noted decline in the abundance of a given species as a consequence of a specific...
2.
Turkia T, Jousimo J, Tiainen J, Helle P, Rintala J, Hokkanen T, et al.
Oecologia
. 2020 Jan;
192(2):425-437.
PMID: 31927627
Spatial synchrony between populations emerges from endogenous and exogenous processes, such as intra- and interspecific interactions and abiotic factors. Understanding factors contributing to synchronous population dynamics help to better understand...
3.
Monkkonen M, Helle P, Soppela K
Oecologia
. 2017 Mar;
85(2):218-225.
PMID: 28312558
We studied experimentally interspecific competition among foliage-gleaning passerine birds by manipulating the density of resident tits. In 1988 tit density was experimentally increased on three small islands in a central...
4.
Forsman J, Monkkonen M, Helle P, Inkeroinen J
Oecologia
. 2017 Mar;
115(1-2):278-286.
PMID: 28308463
We studied experimentally how heterospecific attraction may affect habitat selection of migrant passerine birds in Finnish Lapland. We manipulated the densities of resident tit species (Parus spp.). In four study...
5.
Lyly M, Villers A, Koivisto E, Helle P, Ollila T, Korpimaki E
Oecologia
. 2016 Jun;
182(2):487-98.
PMID: 27342659
Previous studies on intraguild predation have mainly focused on within-class assemblages, even though avian top predators may also influence mammalian mesopredator prey. By using nation-wide long-term data from Finland, northern...
6.
Lyly M, Villers A, Koivisto E, Helle P, Ollila T, Korpimaki E
Ecol Evol
. 2015 Feb;
5(2):503-14.
PMID: 25691975
Top predators may induce extensive cascading effects on lower trophic levels, for example, through intraguild predation (IGP). The impacts of both mammalian and avian top predators on species of the...
7.
Korpela K, Helle P, Henttonen H, Korpimaki E, Koskela E, Ovaskainen O, et al.
Proc Biol Sci
. 2014 Oct;
281(1797).
PMID: 25355481
The cyclic population dynamics of vole and predator communities is a key phenomenon in northern ecosystems, and it appears to be influenced by climate change. Reports of collapsing rodent cycles...
8.
Tornberg R, Linden A, Byholm P, Ranta E, Valkama J, Helle P, et al.
Oecologia
. 2012 Sep;
171(4):863-72.
PMID: 22961371
Different prey species can vary in their significance to a particular predator. In the simplest case, the total available density or biomass of a guild of several prey species might...
9.
Tornberg R, Helle P, Korpimaki E
Oecologia
. 2010 Dec;
166(3):577-84.
PMID: 21181416
The plant cycle hypothesis says that poor-quality food affects both herbivorous voles (Microtinae spp.) and grouse (Tetraonidae spp.) in vole decline years, leading to increased foraging effort in female grouse...
10.
Kurkela S, Ratti O, Huhtamo E, Uzcategui N, Nuorti J, Laakkonen J, et al.
Emerg Infect Dis
. 2008 Feb;
14(1):41-7.
PMID: 18258075
Sindbis virus (SINV), a mosquito-borne virus that causes rash and arthritis, has been causing outbreaks in humans every seventh year in northern Europe. To gain a better understanding of SINV...