20 Works

Data from: Phosphorus limitation enhances parasite impact: feedback effects at the population level

Katja Pulkkinen, Marcin W. Wojewodzic & Dag O. Hessen
Background: Nutrient deficiency affects the growth and population dynamics of consumers. Endoparasites can be seen as consumers that drain carbon (C) or energy from their host while simultaneously competing for limiting resources such as phosphorus (P). Depending on the relative demands of the host and the parasite for the limiting nutrient, intensified resource competition under nutrient limitation can either reduce the parasite?s effect on the host or further reduce the fitness of the nutrient-limited host....

Data from: Replicated origin of female biased adult sex ratio in introduced populations of the Trinidadian guppy (Poecilia reticulata).

Jeffrey D. Arendt, David N. Reznick & Andres López-Sepulcre
There are many theoretical and empirical studies explaining variation in offspring sex ratio but relatively few that explain variation in adult sex ratio. Adult sex ratios are important because biased sex ratios can be a driver of sexual selection and will reduce effective population size which affects population persistence and shapes how populations respond to natural selection. Previous work on guppies (Poecilia reticulata) gives mixed results, usually showing a female-biased adult sex ratio. However a...

Data from: Testis asymmetry in birds: the influences of sexual and natural selection

Sara Calhim & Robert Montgomerie
Gonad size and shape asymmetries are particularly common in birds. Although some obvious size and shape differences between the left and right testes in birds were first documented more than a century ago, little is known about what influences the variation across species in either the degree or the direction of these asymmetries. Here we show that a left bias in size is the most likely ancestral state in most orders and families, and that...

Data from: The effect of inbreeding rate on fitness, inbreeding depression and heterosis over a range of inbreeding coefficients

Nina Pekkala, K. Emily Knott, Janne S. Kotiaho, Kari Nissinen & Mikael Puurtinen
Understanding the effects of inbreeding and genetic drift within populations and hybridization between genetically differentiated populations is important for many basic and applied questions in ecology and evolutionary biology. The magnitudes and even the directions of these effects can be influenced by various factors, especially by the current and historical population size (i.e., inbreeding rate). Using Drosophila littoralis as a model species, we studied the effect of inbreeding rate over a range of inbreeding levels...

Data from: Temporal relationship between genetic and warning signal variation in the aposematic wood tiger moth (Parasemia plantaginis)

Juan A. Galarza, Ossi Nokelainen, Roghaeih Ashrafi, Robert H. Hegna & Johanna Mappes
Many plants and animals advertise unpalatability through warning signals in the form of colour and shape. Variation in warning signals within local populations is not expected because they are subject to directional selection. However, mounting evidence of warning signal variation within local populations suggests that other selective forces may be acting. Moreover, different selective pressures may act on the individual components of a warning signal. At present, we have a limited understanding about how multiple...

Data from: Interspecific interactions influence contrasting spatial genetic structures in two closely related damselfly species

Aapo Kahilainen, Inka Keränen, Katja Kuitunen, Janne S. Kotiaho & K. Emily Knott
Spatial genetic structure (SGS) is largely determined by colonization history, landscape and ecological characteristics of the species. Therefore, sympatric and ecologically similar species are expected to exhibit similar SGSs, potentially enabling prediction of the SGS of one species from that of another. On the other hand, due to interspecific interactions, ecologically similar species could have different SGSs. We explored the SGSs of the closely related Calopteryx splendens and C. virgo within Finland and related the...

Data from: Recent speciation and secondary contact in endemic ants

Michael J. Jowers, Fernando Amor, Patrocinio Ortega, Alain Lenoir, Raphaël R. Boulay, Xim Cerdá & Juan A. Galarza
Gene flow is the main force opposing divergent selection, and its effects are greater in populations in close proximity. Thus, complete reproductive isolation between parapatric populations is not expected, particularly in the absence of ecological adaptation and sharp environmental differences. Here, we explore the biogeographical patterns of an endemic ant species, Cataglyphis floricola, for which two colour morphs (black and bicolour) coexist in parapatry throughout continuous sandy habitat in southern Spain. Discriminant analyses of six...

Data from: Predator–vole interactions in northern Europe: the role of small mustelids revised

Katri Korpela, Pekka Helle, Heikki Henttonen, Erkki Korpimäki, Esa Koskela, Otso Ovaskainen, Hannu Pietiäinen, Janne Sundell, Jari Valkama, Otso Huitu, H. Pietiainen & E. Korpimaki
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 have attributed the changes to warmer winters, which weaken the interaction between voles and their specialist subnivean predators. Using population data collected throughout Finland during 1986–2011, we analyse the spatio-temporal variation in the interactions between populations of voles and specialist, generalist and avian predators, and...

Data from: Contrasting effects of large density changes on relative testes size in fluctuating populations of sympatric vole species

Ines Klemme, Carl D. Soulsbury & Heikki Henttonen
Across species, there is usually a positive relationship between sperm competition level and male reproductive effort on ejaculates, typically measured using relative testes size (RTS). Within populations, demographic and ecological processes may drastically alter the level of sperm competition and thus, potentially affect the evolution of testes size. Here, we use longitudinal records (across 38 years) from wild sympatric Fennoscandian populations of five species of voles to investigate whether RTS responds to natural fluctuations in...

Data from: Reproductive isolation among allopatric Drosophila montana populations

Jackson Hubbard Jennings, Rhonda R. Snook & Anneli Hoikkala
An outstanding goal in speciation research is to trace the mode and tempo of the evolution of barriers to gene flow. Such research benefits from studying incipient speciation, in which speciation between populations has not yet occurred but where multiple potential mechanisms of reproductive isolation (RI: i.e. premating, postmating-prezygotic (PMPZ), and postzygotic barriers) may act. We used such a system to investigate these barriers among allopatric populations of Drosophila montana. In all heteropopulation crosses we...

Data from: Sex-specific effects of natural and sexual selection on the evolution of life span and ageing in Drosophila simulans

Catharine Ruth Archer, Eoin Duffy, David J. Hosken, Mikael Mokkonen, Kensuke Okada, Keiko Oku, Manmohan D. Sharma & John Hunt
1. Variation in the strength of age-dependent natural selection shapes differences in ageing rates across species and populations. Likewise, sexual selection can promote divergent patterns of senescence across the sexes. However, the effects of these processes on the evolution of ageing have largely been considered independently, and interactions between them are poorly understood. 2. We use experimental evolution to investigate how natural and sexual selection affect life span and ageing in Drosophila simulans. 3. Replicate...

Data from: Heterospecific female mimicry in Ficedula flycatchers

Sara Calhim, Peter Adamík, Pauliina Järvistö, Paula Leskinen, János Török, Kazumasa Wakamatsu & Toni Laaksonen
Mimicry is a widespread phenomenon. Vertebrate visual mimicry often operates in an intraspecific sexual context, with some males resembling conspecific females. Pied flycatcher (Ficedula hypoleuca) dorsal plumage varies from the ancestral black to female-like brown. Experimental studies have shown that conspecific and heterospecific (collared flycatcher, F. albicollis) individuals of both sexes respond, at least initially, to brown individuals as if they were female. We quantified the perceptual and biochemical differences between brown feathers and found...

Data from: Top-down effects of a lytic bacteriophage and protozoa on bacteria in aqueous and biofilm phases

Ji Zhang, Anni-Maria Örmälä-Odegrip, Johanna Mappes & Jouni Laakso
Lytic bacteriophages and protozoan predators are the major causes of bacterial mortality in natural microbial communities, which also makes them potential candidates for biological control of bacterial pathogens. However, little is known about the relative impact of bacteriophages and protozoa on the dynamics of bacterial biomass in aqueous and biofilm phases. Here, we studied the temporal and spatial dynamics of bacterial biomass in a microcosm experiment where opportunistic pathogenic bacteria Serratia marcescens was exposed to...

Data from: Quality attracts parasites: host condition-dependent chemo-orientation of trematode larvae

Otto Seppälä & Katja Leicht
1. Environmental factors impairing physiological condition of organisms are assumed to predispose them to parasite infections. This is because host immune function is typically condition-dependent. However, poor physiological condition has been reported to reduce host susceptibility to parasites in various systems. 2. We examined whether such an effect can be due to altered exposure of hosts to active parasite transmission stages by investigating chemo-orientation of free-swimming cercariae larvae of a parasite Echinoparyphium aconiatum towards its...

Data from: Virus epidemics can lead to a population-wide spread of intragenomic parasites in a previously parasite-free asexual population

Matti Jalasvuori & Jussi Lehtonen
In a recent issue of Molecular Ecology the role of intragenomic parasites in maintaining sexual reproduction was both experimentally evaluated by Kraaijeveld et al. and discussed by Crespi and Schwander. The prevalence of sex is difficult to explain, due to its costs when compared with asexual reproduction. Yet, as reviewed by Crespi and Schwander, sex can be favorable in the presence of proliferating transposons. Transposons are similar to mutations, in that their integration to non-neutral...

Data from: The relevance of ecological status to ecosystem functions and services in a large boreal lake

Kimmo T. Tolonen, Heikki Hämäläinen, Anssi Lensu, Jarmo J. Meriläinen, Arja Palomäki & Juha Karjalainen
1. Environmental conventions aim to protect ecosystem structures and functions to provide goods and services for mankind. The degree of aquatic ecosystem naturalness, or ecological status as it is defined in the Water Framework Directive (WFD) of the European Union, is notionally linked to supplies of ecosystem services. In practice these links have rarely been documented or even investigated and, to justify conservation and management objectives based on the status indicators, it is essential to...

Data from: Population-level consequences of risky dispersal

Allison K. Shaw, Matti Jalasvuori & Hanna Kokko
Achieving sufficient connectivity between populations is essential for persistence, but costs of dispersal may select against individual traits or behaviours that, if present, would improve connectivity. Existing dispersal models tend to ignore the multitude of risks to individuals: while many assess the effect of mortality costs, there is also a risk of failing to find new habitat, especially when the entire inhabitable area remains both small and fragmented. There are few known rules governing whether...

Data from: Temporal genetic structure in a poecilogonous polychaete: the interplay of developmental mode and environmental stochasticity

Jenni E. Kesäniemi, Marina Mustonen, Christoffer Boström, Benni W. Hansen & K. Emily Knott
Background: Temporal variation in the genetic structure of populations can be caused by multiple factors, including natural selection, stochastic environmental variation, migration, or genetic drift. In benthic marine species, the developmental mode of larvae may indicate a possibility for temporal genetic variation: species with dispersive planktonic larvae are expected to be more likely to show temporal genetic variation than species with benthic or brooded non-dispersive larvae, due to differences in larval mortality and dispersal ability....

Data from: Limited indirect fitness benefits of male group membership in a lekking species

Christophe Lebigre, Rauno V. Alatalo, Carl D. Soulsbury, Jacob Höglund & Heli Siitari
In group living species, individuals may gain the indirect fitness benefits characterising kin selection when groups contain close relatives. However, tests of kin selection have primarily focused on cooperatively breeding and eusocial species, whereas its importance in other forms of group living remains to be fully understood. Lekking is a form of grouping where males display on small aggregated territories, which females then visit to mate. As females prefer larger aggregations, territorial males might gain...

Data from: Does recognized genetic management in supportive breeding prevent genetic changes in life-history traits?

Rémi Chargé, Gabriele Sorci, Michel Saint Jalme, Loïc Lesobre, Yves Hingrat, Frédéric Lacroix & Celine Teplitsky
Supportive breeding is one of the last resort conservation strategies to avoid species extinction. Management of captive populations is challenging because several harmful genetic processes need to be avoided. Several recommendations have been proposed to limit these deleterious effects, but empirical assessments of these strategies remain scarce. We investigated the outcome of a genetic management in a supportive breeding for the Houbara Bustard. At the phenotypic level, we found an increase over generations in the...

Registration Year

  • 2014

Resource Types

  • Dataset


  • University of Jyväskylä
  • Australian National University
  • Forest Research Institute
  • University of Lincoln
  • University of Helsinki
  • University of Turku
  • Estación Biológica de Doñana
  • Swiss Federal Institute of Aquatic Science and Technology
  • Roskilde University
  • University of Minnesota