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553 results for “damselflies”
Data from: Predator-mediated natural selection on the wings of the damselfly Calopteryx splendens: differences in selection among trait types
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Seasonal time constraints shape life history, physiology and behaviour independently, and decouple a behavioural syndrome in a damselfly
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Data from: The relationship between microhabitat use, allometry, and functional variation in the eyes of Hawaiian Megalagrion damselflies
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Data from: Male biased sex ratio reduces the fecundity of one of three female morphs in a polymorphic damselfly
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Data from: Interspecific interactions influence contrasting spatial genetic structures in two closely related damselfly species
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Data from: Divergence in female damselfly sensory structures is consistent with a species recognition function but shows no evidence of reproductive character displacement
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Data from: Genetic divergence predicts reproductive isolation in damselflies
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Tests of search image and learning in the wild: insights from sexual conflict in damselflies
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Threats from the air: damselfly predation on diverse prey taxa
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FIGURE 1 in The first damselfly (Odonata, Lestidae) from the upper Eocene of Monteils (Gard, France)
FIGURE 1. Lestes regina Théobald, 1937, UBGD 32320, Monteils. General habitus. Scale bar = 10 mm.
FIGURES 94–97 in Damselflies of the genus Argia (Odonata: Coenagrionidae) from Ecuador with descriptions of five new species
FIGURES 94–97. Genital ligula. (a) lateral view; (b) ectal view; (c) entolateral view.
Transcriptome assembly for: Genetic compensation rather than genetic assimilation drives the evolution of plasticity in response to mild warming across latitudes in a damselfly
<p><span>Global warming is causing plastic and evolutionary changes in the phenotypes of ectotherms. Yet, we have limited knowledge on how the interplay between plasticity and evolution shapes thermal responses and underlying gene expression patterns. We assessed thermal reaction norm patterns across the transcriptome and identified associated molecular pathways in northern and southern populations of the damselfly <i>Ischnura elegans</i>. Larvae were reared<i> </i>in a common garden experiment at the mean summer water temperatures experienced at the northern (20 °C) and southern (24 °C) latitudes. This allowed a space-for-time substitution where the current gene expression levels at 24 °C in southern larvae are a proxy for the expected responses of northern larvae under gradual thermal evolution to the predicted 4 °C warming. Most differentially expressed genes showed fixed differences across temperatures between latitudes, suggesting that thermal genetic adaptation will mainly evolve through changes in constitutive gene expression. Northern populations also frequently showed plastic responses in gene expression to mild warming, while southern populations were much less responsive to temperature. Thermal responsive genes in northern populations showed to a large extent a pattern of genetic compensation, i.e. gene expression that was induced at 24 °C in northern populations remained at a lower constant level in southern populations, and were associated with metabolic and translation pathways. There was instead little evidence for genetic assimilation of an initial plastic response to mild warming. Our data therefore suggest that genetic compensation rather than genetic assimilation may drive the evolution of plasticity in response to mild warming in this damselfly species.</span></p>
FIGURE 2 in A review of the damselfly genus Megalestes Selys, 1862 (Insecta: Odonata Zygoptera: Synlestidae) using integrative taxonomic methods
FIGURE 2. Photos of male Megalestes riccii showing color changes with maturing.
FIGURE 1 in A review of the damselfly genus Megalestes Selys, 1862 (Insecta: Odonata Zygoptera: Synlestidae) using integrative taxonomic methods
FIGURE 1. Distribution of the species of genus Megalestes.
Data from: Environmental levels of neonicotinoids reduce prey consumption, mobility and emergence of the damselfly Ischnura elegans
Freshwaters are among the most endangered ecosystems in the world as a result of anthropogenic interference such as pollution. Pollution in the form of neonicotinoids has been intensively studied, but data thus far is often conflicted by contrasting responses between laboratory and field experiments. In addition, toxicity data are scarce and contradictory for insects such as Odonates (dragonflies and damselflies) and a potential risk to them may therefore be overlooked. We investigate the potential risk of neonicotinoids to Odonates by exposing nymphs of the blue‐tailed damselfly Ischnura elegans to environmentally relevant concentrations of the neonicotinoid thiacloprid. We consider I. elegans as an indicator species for other Odonates as it is an abundant, widespread and eurytopic species. We analyse the effects of thiacloprid on multiple endpoints (survival, consumption, growth, molting, mobility and emergence), using cage‐experiments as well as controlled field observations in naturally colonized experimental ditches. In addition, we assess sensitivity by either feeding the damselfly nymphs with lab‐cultured prey or by letting them feed freely on natural aquatic invertebrates. All sublethal endpoints of I. elegans are affected to some degree, and strongly depend on the food offered; free‐feeding nymphs are more sensitive than culture‐fed nymphs. Environmental relevant concentrations of thiacloprid strongly reduce the emergence of I. elegans and this effect is more substantial in the natural populations compared to the caged damselflies. This is likely explained by exclusion of additional biotic pressures such as predation in the caged experiment. Policy implications. Literature reports that one out of seven Odonates is threatened and 24% of the species have declining populations. Our observations show that current risks of neonicotinoids to Odonates are underestimated in laboratory experiments as the toxicity is governed by multiple biotic factors such as food quantity/quality and predation. Given the widespread abundance of blue‐tailed damselfly Ischnura elegans, the observed sensitivity to neonicotinoids and current population trends of this species, these results indicate neonicotinoids play a central role in the Odonate decline in general.
Data from: Lack of genetic variation prevents adaptation at the geographic range margin in a damselfly
What limits a species' distribution in the absence of physical barriers? Genetic load due to asymmetric gene flow and the absence of genetic variation due to lack of gene flow are hypothesized to constrain adaptation to novel environments in marginal populations, preventing range expansion. Here, we examined the genetic structure and geographic variation in morphological traits in two damselflies (Ischnura asiatica and I. senegalensis) along a latitudinal gradient in Japan, which is the distribution centre of I. asiatica and the northern limit of I. senegalensis. Genomewide genetic analyses found a loss of genetic diversity at the edge of distribution in I. senegalensis but consistently high diversity in I. asiatica. Gene flow was asymmetric in a south–north direction in both species. Although body size and wing loading showed decreasing latitudinal clines (smaller in north) in I. asiatica in Japan, increasing latitudinal clines (larger in north) in these phenotypic markers were observed in I. senegalensis, particularly near the northern boundary, which coincided well with the location where genetic diversity began a sharp decline. In ectothermic animals, increasing latitudinal cline in these traits was suggested to be established when they failed to adapt to thermal gradient. Therefore, our findings support the possibility that a lack of genetic variation rather than geneflow swamping is responsible for the constraint of adaptation at the margin of geographic distribution.
Data from: Interspecific aggression, not interspecific mating, drives character displacement in the wing colouration of male rubyspot damselflies (Hetaerina)
Traits that mediate intraspecific social interactions may overlap in closely related sympatric species, resulting in costly between-species interactions. Such interactions have principally interested investigators studying the evolution of reproductive isolation via reproductive character displacement (RCD) or reinforcement, yet in addition to reproductive interference, interspecific trait overlap can lead to costly between-species aggression. Previous research on rubyspot damselflies (Hetaerina spp.) demonstrated that sympatric shifts in male wing colour patterns and competitor recognition reduce interspecific aggression, supporting the hypothesis that agonistic character displacement (ACD) drove trait shifts. However, a recent theoretical model shows that RCD overshadows ACD if the same male trait is used for both female mate recognition and male competitor recognition. To determine whether female mate recognition is based on male wing coloration in Hetaerina, we conducted a phenotype manipulation experiment. Compared to control males, male H. americana with wings manipulated to resemble a sympatric congener (H. titia) suffered no reduction in mating success. Thus, female mate recognition is not based on species differences in male wing coloration. Experimental males did, however, experience higher interspecific fighting rates and reduced survival compared to controls. These results greatly strengthen the case for ACD and highlight the mechanistic distinction between ACD and RCD.
Data from: A phylogenetic perspective on habitat shifts and diversity in the North American Enallagma damselflies
Community ecologists are increasingly aware that the regional history of taxon diversification can have an important influence on community structure. Likewise, systematists recognize that ecological context can have an important influence on the processes of speciation and extinction that create patterns of descent. We present a phylogenetic analysis of 33 species of a North American radiation of damselflies (Zygoptera: Coenagrionidae: Enallagma Selys), which have been well-studied ecologically, in order to elucidate the evolutionary mechanisms that have contributed to differences in diversity between larval habitats (lakes with and without fish predators). Analysis of molecular variation in 842 bp of the mitochondrial cytochrome oxidase I and II subunit and the intervening Leu-tRNA and 37 morphological characters resulted in three well-defined clades that are only partially congruent with previous phylogenetic hypotheses. Molecular and morphological data partitions were significantly incongruent. Lack of haplotype monophyly within species and small levels of sequence divergence (<1%) between related species in 3 of the 4 clades suggests that recent, and parallel, speciation has been an important source of community diversity. Reconstruction of habitat preference over the phylogeny suggests that the greater species diversity in fish-lake habitats is due to the recency of shifts into the fishless-lake habit, although a difference in speciation or extinction rates between the two habitats is difficult to exclude as an additional mechanism.
FIGURES 1–2. Drepanosticta wildermuthi. 1. Prothorax oblique lateral view, 2 in Two new damselfly species from Polillo Island, Philippines (Odonata: Platystictidae)
FIGURES 1–2. Drepanosticta wildermuthi. 1. Prothorax oblique lateral view, 2. Cerci lateral view.
FIGURE 7 in Matrona taoi spec. nov., a new damselfly species from northern Vietnam (Odonata: Calopterygidae)
FIGURE 7. Matrona taoi sp. nov. paratype male; venation at hind wing base.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.