Search results for: Panu Välimäki

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article

Ecological and life‐history traits predict temporal trends in biomass of boreal moths

Mahtab Yazdanian, Tuomas Kankaanpää, Juhani Itämies, Reima Leinonen, more

Insect Conservation and Diversity > 16 > 5 > 600 - 615

Dramatic insect declines, and their consequences for ecosystems globally, have received considerable attention recently. Yet, it is still poorly known if ecological and life‐history traits can explain declines and whether insect decline occurs also at high latitudes. Insects' diversity and abundance are dramatically lower at high latitudes compared to the tropics, and insects might benefit from climate...

article

Evaluating the role and measures of juvenile growth rate: latitudinal variation in insect life histories

Hendrik Meister, Toomas Esperk, Panu Välimäki, Toomas Tammaru

Oikos > 126 > 12 > 1726 - 1737

Latitudinal and elevational trends in body size are found in numerous animal taxa, with various adaptive explanations proposed. It is however debatable whether geographic trends in adult body size are accompanied by corresponding differences in juvenile growth rate (= mass gain per unit time). Respective studies have been complicated by conceptual and methodological problems related to defining and...

article

Erratum to: Northern Goshawk (Accipiter gentilis) may improve Black Grouse breeding success

Risto Tornberg, Jaakko Junikka, Seppo Rytkönen, Panu Välimäki, more

Journal of Ornithology > 2017 > 158 > 3 > 895-895

The online version of the original article can be found under doi: 10.1007/s10336-015-1292-4 .

article

Northern Goshawk (Accipiter gentilis) may improve Black Grouse breeding success

Risto Tornberg, Seppo Rytkönen, Panu Välimäki, Jari Valkama, more

Journal of Ornithology > 2016 > 157 > 1 > 363-370

Around the nests of many birds of prey the pressure of nest predators is decreased. This attracts other bird species to breed near nests of those birds of prey in order to benefit from protection conferred. This study examines the possible protective effect of the Northern Goshawk (Accipiter gentilis) on two of its main prey species, the Black Grouse (Tetrao tetrix) and the Capercaillie (Tetrao urogallus...

article

Morphological variation between populations of the expanding ectoparasitic deer ked Lipoptena cervi (Diptera: Hippoboscidae) in Fennoscandia

Mervi Jaakola, Meri Ojanen, Eija Hurme, Marko Mutanen, more

Biological Journal of the Linnean Society > 116 > 2 > 432 - 448

We examined morphological and genetic differences among Fennoscandian deer ked (Lipoptena cervi L, Hippoboscidae) populations with varying expansion history: the eastern population (Finland) has expanded rapidly, whereas the western population is divided into an old and relatively stationary sub‐population in Sweden and a newly established and more expansive sub‐population in Norway. The genetic analysis...

article

Larval melanism in a geometrid moth: promoted neither by a thermal nor seasonal adaptation but desiccating environments

Panu Välimäki, Sami M. Kivelä, Jani Raitanen, Veli‐Matti Pakanen, more

Journal of Animal Ecology > 84 > 3 > 817 - 828

Spatiotemporal variation in the degree of melanism is often considered in the context of thermal adaptation, melanism being advantageous under suboptimal thermal conditions. Yet, other mutually nonexclusive explanations exist. Analysis of geographical patterns combined with laboratory experiments on the mechanisms of morph induction helps to unveil the adaptive value of particular cases of polyphenism...

article

Large Roads Disrupt Insect Movement: A Case Study of the Spodoptera littoralis (Lepidoptera: Noctuidae)

Netta Keret, Panu Välimäki, Marko Mutanen, Uri Shanas

Journal of Insect Behavior > 2015 > 28 > 5 > 544-554

Roads are a growing mosaic in the landscape, splitting and reducing the area of natural habitats of organisms. To examine the effects of large roads on insect movements, the Egyptian cotton leaf worm moth Spodoptera littoralis was used as a model species in a mark-recapture experiment. The flight of male moths towards female sexual pheromone across a motorway and an open field was compared. Road constructions...

article

Signature of post‐glacial expansion and genetic structure at the northern range limit of the speckled wood butterfly

Jean‐Luc Tison, Veronica Nyström Edmark, Edson Sandoval‐Castellanos, Hans Van Dyck, more

Biological Journal of the Linnean Society > 113 > 1 > 136 - 148

The post‐glacial recolonisation of northern Europe has left distinct signatures in the genomes of many organisms, both due to random demographic processes and divergent natural selection. However, information on differences in genetic variation in conjunction with patterns of local adaptations along latitudinal gradients is often lacking. In this study, we examine genetic diversity and population...

article

Diet shift induced rapid evolution of size and function in a predatory bird

Risto Tornberg, Laura Liuska, Seppo Rytkönen, Marko Mutanen, more

Oecologia > 2014 > 176 > 3 > 781-788

A predator’s body size correlates with its prey size. Change in the diet may call for changes in the hunting mode and traits determining hunting success. We explored long-term trends in sternum size and shape in the northern goshawk by applying geometric morphometrics. Tetraonids, the primary prey of the goshawk, have decreased and been replaced by smaller birds in the diet. We expected that the size...

article

SEASONALITY MAINTAINS ALTERNATIVE LIFE‐HISTORY PHENOTYPES

Sami M. Kivelä, Panu Välimäki, Karl Gotthard

Evolution > 67 > 11 > 3145 - 3160

Many organisms express discrete alternative phenotypes (polyphenisms) in relation to predictable environmental variation. However, the evolution of alternative life‐history phenotypes remains poorly understood. Here, we analyze the evolution of alternative life histories in seasonal environments by using temperate insects as a model system. Temperate insects express alternative developmental pathways...

article

Temperature- and density-dependence of diapause induction and its life history correlates in the geometrid moth Chiasmia clathrata (Lepidoptera: Geometridae)

Panu Välimäki, Sami M. Kivelä, Maarit I. Mäenpää

Evolutionary Ecology > 2013 > 27 > 6 > 1217-1233

The relative roles of genetics and developmental plasticity in creating phenotypes adapted to prevailing conditions are insufficiently understood. In potentially multivoltine temperate insects, individuals that do not enter diapause but develop directly into reproductive adults within the same season are severely time-constrained. Direct development is, however, under selection only if expressed in...

article

Avian predation on a parasitic fly of cervids during winter: can host‐related cues increase the predation risk?

SIRPA KAUNISTO, PANU VÄLIMÄKI, RAINE KORTET, JANI KOSKIMÄKI, more

Biological Journal of the Linnean Society > 106 > 2 > 275 - 286

The deer ked (Lipoptena cervi) is an ectoparasitic fly on cervids that has expanded its distribution rapidly in Northern Europe. However, the regulating biotic factors such as predation remain unknown. The host‐independent pupal stage of the fly lasts for several months. Blackish pupae are visible against snow, especially on the bedding sites of hosts, and are thus exposed to predators. To evaluate...

article

Geographic variation in resource allocation to the abdomen in geometrid moths

Sami M. Kivelä, Panu Välimäki, David Carrasco, Maarit I. Mäenpää, more

The Science of Nature > 2012 > 99 > 8 > 607-616

A resource allocation trade-off is expected when resources from a common pool are allocated to two or more traits. In holometabolous insects, resource allocation to different functions during metamorphosis relies completely on larval-derived resources. At adult eclosion, resource allocation to the abdomen at the expense of other body parts can be seen as a rough estimate of resource allocation to...

article

Latitudinal insect body size clines revisited: a critical evaluation of the saw‐tooth model

Sami M. Kivelä, Panu Välimäki, David Carrasco, Maarit I. Mäenpää, more

Journal of Animal Ecology > 80 > 6 > 1184 - 1195

1. Insect body size is predicted to increase with decreasing latitude because time available for growth increases. In insects with changing voltinism (i.e. number of generations per season), sharp decreases in development time and body size are expected at season lengths where new generations are added to the phenology of a species, giving rise to saw‐tooth clines in these traits across latitudes...

article

Geographical variation in host use of a blood-feeding ectoparasitic fly: implications for population invasiveness

Panu Välimäki, Arja Kaitala, Knut Madslien, Laura Härkönen, more

Oecologia > 2011 > 166 > 4 > 985-995

Invasive generalist ectoparasites provide a tool to study factors affecting expansion rates. An increase in the number of host species may facilitate geographic range expansion by increasing the number of suitable habitats and by affecting local extinction and colonization rates. A geographic perspective on parasite host specificity and its implications on range expansion are, however, insufficiently...

article

Mating with a kin decreases female remating interval: a possible example of inbreeding avoidance

Panu Välimäki, Sami M. Kivelä, Maarit I. Mäenpää

Behavioral Ecology and Sociobiology > 2011 > 65 > 11 > 2037-2047

Inbreeding depression is a relative decline in fitness in offspring of related parents. The magnitude of inbreeding costs varies among taxa and may increase under stressful conditions. Inbreeding tolerance is expected to be low and selection for inbreeding avoidance intense when both sexes invest substantially in shared offspring like in nuptial gift-giving butterflies. This is especially true for...

article

Properties of male ejaculates do not generate geographical variation in female mating tactics in a butterfly Pieris napi

Panu Välimäki, Arja Kaitala

Animal Behaviour > 2010 > 79 > 5 > 1173-1179

Polyandry brings about benefits for females but, from the males' perspective, if there is a possibility of females mating with multiple partners, male characteristics that prevent or delay remating of females are favoured, which may result in antagonistic coevolution between the sexes. The green-veined white butterfly, Pieris napi, is a predominantly polyandrous species with male nutrient donation...

article

Fennoscandian distribution of an important parasite of cervids, the deer ked (Lipoptena cervi), revisited

Panu Välimäki, Knut Madslien, Jonas Malmsten, Laura Härkönen, more

Parasitology Research > 2010 > 107 > 1 > 117-125

The deer ked [Lipoptena cervi (L. 1758) (Dipt., Hippoboscidae)] is a blood-sucking ectoparasite of cervids. The species has been resident in Sweden for more than two centuries, whereas in Finland (≈50 years) and Norway (≈30 years), it has established itself relatively recently. L. cervi may cause serious health problems in its natural hosts, act as a vector for zoonotic diseases, and pose a socioeconomic...

article

The value of open power line habitat in conservation of ground beetles (Coleoptera: Carabidae) associated with mires

Antti Hollmen, Panu Välimäki, Juhani Itämies, Jari Oksanen

Journal of Insect Conservation > 2008 > 12 > 2 > 163-177

The draining of mires for silvicultural purposes has caused one of the most dramatic changes in the landscape during the last century in Finland. To study the effects of mire drainage, carabid beetle assemblages were sampled using pitfall trapping in three different mire habitat types. Carabids were sampled from mires in their natural state, drained mires and drained mires with an open power line...

article

Temporal patterns in reproduction may explain variationin mating frequencies in the green-veined white butterfly Pieris napi

Panu Välimäki, Arja Kaitala, Hanna Kokko

Behavioral Ecology and Sociobiology > 2006 > 61 > 1 > 99-107

There is genetic variation in the female mating rate in the green-veined white butterfly (Pieris napi), and females benefit from male ejaculates that contain both sperm and accessory gland substances. Although polyandry corresponds to higher lifetime fecundity than monandry, some females abstain from remating irrespective of the number of available mates. Explaining genetic variation in mating rates...

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