Search results for "sudenkorennot"
showing 7 items of 7 documents
High variation in last male sperm precedence and genital morphology in the emerald damselfly, Lestes sponsa
2020
Abstract In organisms in which individuals mate multiply, knowledge of the proportion of offspring sired by the last male to mate (P2) under field conditions is important for a thorough understanding of how sexual selection works in nature. In many insect groups, pronounced intraspecific variation in P2 is commonplace. Interestingly, however, in stark contrast to these observations, compilation of P2 data in dragonflies and damselflies (Odonata) indicates that a high P2, seldom below 0.95, is a feature of this taxon. Here we used double digest restriction-site associated DNA sequencing to generate a panel of single nucleotide polymorphisms (SNPs) with which we could determine paternity and …
Natural selection mediated by seasonal time constraints increases the alignment between evolvability and developmental plasticity
2021
Abstract Phenotypic plasticity can either hinder or promote adaptation to novel environments. Recent studies that have quantified alignments between plasticity, genetic variation, and divergence propose that such alignments may reflect constraints that bias future evolutionary trajectories. Here, we emphasize that such alignments may themselves be a result of natural selection and do not necessarily indicate constraints on adaptation. We estimated developmental plasticity and broad sense genetic covariance matrices (G) among damselfly populations situated along a latitudinal gradient in Europe. Damselflies were reared at photoperiod treatments that simulated the seasonal time constraints ex…
Regional variations in occupancy frequency distributions patterns between odonate assemblages in Fennoscandia
2018
Odonate (damselfly and dragonfly) species richness and species occupancy frequency distributions (SOFD) were analysed in relation to geographical location in standing waters (lakes and ponds) in Fennoscandia, from southern Sweden to central Finland. In total, 46 dragonfly and damselfly species were recorded from 292 waterbodies. Species richness decreased to the north and increased with waterbody area in central Finland, but not in southern Finland or in Sweden. Species occupancy ranged from 1 up to 209 lakes and ponds. Over 50% of the species occurred in less than 10% of the waterbodies, although this proportion decreased to the north. In the southern lakes and ponds, none of the species o…
Do allopatric male Calopteryx virgo damselflies learn species recognition?
2012
There is a growing amount of empirical evidence that premating reproductive isolation of two closely related species can be reinforced by natural selection arising from avoidance of maladaptive hybridization. However, as an alternative for this popular reinforcement theory, it has been suggested that learning to prefer conspecifics or to discriminate heterospecifics could cause a similar pattern of reinforced premating isolation, but this possibility is much less studied. Here, we report results of a field experiment in which we examined (i) whether allopatric Calopteryx virgo damselfly males that have not encountered heterospecific females of the congener C. splendens initially show discri…
Perspectives on variation in species richness : area, energy and habitat heterogeneity
2011
Interspecific interactions and selection on secondary sexual characters in damselflies
2005
Lajienvälinen aggressiivisuus voi selittää immenkorentokoiraiden seksuaaliominaisuuden koossa havaittavaa vaihtelua, toteaa Katja Tynkkynen väitöskirjatyössään. Sekundaarisien seksuaaliominaisuuksien, kuten koiraslintujen kirkkaan värityksen, on tulkittu olevan seurausta seksuaalivalinnasta. Koiraat, joilla on suurempi tai upeampi seksuaaliominaisuus saavat yleensä muita suuremman lisääntymismenestyksen, minkä seurauksena seksuaaliominaisuuksiin kohdistuu positiivista suuntaavaa valintaa. Näin voi tapahtua esimerkiksi naaraan valinnan seurauksena tai koska suuren tai upean seksuaaliominaisuuden omaavat koiraat menestyvät paremmin koiraiden välisessä kilpailussa. Lajiensisäisten vuorovaikutu…