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513 results for “dragonflies”
Data from: Intrasexual selection favours an immune-correlated colour ornament in a dragonfly
Sexual signalling is predicted to shape the evolution of sex-specific ornamentation, and establishing the costs and benefits of ornamentation and the information that ornamentation provides to receivers is necessary to evaluating this adaptive function. Here, we assessed the adaptive function of a common colour ornament in insects, melanin wing ornamentation, using the dragonfly Pachydiplax longipennis. We hypothesized that greater ornamentation would improve territory-holding success by decreasing aggression that males receive from territorial rivals, but that more ornamented males may have shorter lifespans. Using mark–recapture field observations, we found that more ornamented males had greater territory-holding success and that viability selection did not act on wing melanization. We then compared the aggression of territorial rivals to decoy males before and after experimentally augmenting wing melanization, finding that males significantly reduced aggression following the manipulation. We next hypothesized that wing melanization would signal fighting ability to territorial rivals by reflecting condition via investment in the costly melanin synthesis pathway. We observed a positive relationship between ornamentation and the likelihood of winning territorial disputes, suggesting that wing melanization provides information about fighting ability to rivals. We also found a positive relationship between melanin-based immune defence and ornamentation, supporting a link between the signal and condition. We conclude that wing melanization is a condition-related signal of fighting ability and suggest that this may be a common mechanism promoting the evolution of melanin ornamentation.
Data from: Colour lightness of dragonfly assemblages across North America and Europe
Dark-coloured ectotherms absorb energy from the environment at higher rates than light-coloured ectotherms. The thermal melanism hypothesis (TMH) states that this physical mechanism links the colour lightness of the body surfaces of ectotherms to their thermal environment and hence to their geographical distribution. Studies on different insect taxa in Europe found support for this prediction of the TMH. However, whether these results hold also for other biogeographical regions remains unclear. Here, we quantify and map the colour lightness of dragonfly species in North America and directly compare our results to previously published findings for Europe. We estimated the colour lightness of 152 North American dragonfly species from published illustrations, compiled their distribution data from the literature and combined all these data with six biologically relevant environmental variables. We evaluated the importance of phylogenetic autocorrelation for the spatial variation of mean colour lightness of dragonfly assemblages (grid cells of approximately 50 km × 50 km size) by repeating all analyses also for the phylogenetically predicted component of the colour lightness of species and the species-specific deviation from this prediction. We also accounted for spatial autocorrelation with autoregressive error models. All statistical approaches showed that dragonfly assemblages from both continents consistently tended to be darker coloured in regions with cold climates and lighter coloured in regions with warm climates. Regression slopes, however, were significantly less steep, and the amount of variance explained by environmental variables was lower for North America than for Europe. Our results highlight the importance of colour lightness for the distribution of dragonfly species, but they also indicate that idiosyncrasies of the continents modify the general pattern.
Photo 2. Sandy forest stream near Moyabi, Gabon. Habitat of Umma gumma, Paragomphus dispar and Trithemis legrandi. Photo: JK (24-ix-2013). In: Sixty new dragonfly and damselfly species from Africa (Odonata)
<p>uploaded for Odonatologica by Plazi</p>
Type Photo 1. Holotype of Umma gumma sp. nov., RMNH. In: Sixty new dragonfly and damselfly species from Africa (Odonata)
<p>uploaded by Plazi</p>
Figure 1. Male cerci in dorsal view (left) and paraprocts in ventral view with dotted outline of cerci (right) of Umma gumma sp. nov. and U. longistigma. In: Sixty new dragonfly and damselfly species from Africa (Odonata)
<p>uploaded by Plazi</p>
Photo 1. Umma gumma, male; Moyabi, Gabon. Photo: JK (24-ix-2013). In: Sixty new dragonfly and damselfly species from Africa (Odonata)
<p>uploaded for Odonatologica by Plazi</p>
FIGURES 18–23 in Gone with the wind: westward dispersal across the Indian Ocean and island speciation in Hemicordulia dragonflies (Odonata: Corduliidae)
FIGURES 18–23. Distribution of discussed genera. The courses of storms from May to November in the northern hemisphere and November to May in the southern hemisphere are indicated by arrows (after Times Books 1997). (18) Hemicordulia and Procordulia dragonflies, pale shading: main range in Australasia and Pacific; dark shading: H. africana n. sp.; crosses and pale shading: H. similis; square: H. virens; circle: H. atrovirens n. sp.; (19) Teinobasis damselflies, pale shading: main range in Australasia and Pacific; dark shading: T. alluaudi; (20) Collocalia swiftlets; (21) Copsychus magpie robins; (22) Hypsipetes bulbuls; (23) Pteropus flying foxes.
FIGURES 2–11. 2–6 in Gone with the wind: westward dispersal across the Indian Ocean and island speciation in Hemicordulia dragonflies (Odonata: Corduliidae)
FIGURES 2–11. 2–6, Male appendages of Hemicordulia species in dorsal view. (2) H. asiatica; (3) H. virens; (4) H. atrovirens n. sp.; (5) H. similis; (6) H. africana n. sp.; 7–11, Male appendages of Hemicordulia species in lateral view. (7) H. asiatica; (8) H. virens; (9) H. atrovirens n. sp.; (10) H. similis; (11) H. africana n. sp.
FIGURES 12–17. Vulvar scale and S9 in Gone with the wind: westward dispersal across the Indian Ocean and island speciation in Hemicordulia dragonflies (Odonata: Corduliidae)
FIGURES 12–17. Vulvar scale and S9 of Hemicordulia species in ventral view. (12) H. asiatica; (13) H. virens; (14) H. atrovirens n. sp.; (15) aberrant H. similis (cf. Fraser 1949); (16) typical H. similis; (17) H. africana n. sp.
FIGURES 24–25 in Gone with the wind: westward dispersal across the Indian Ocean and island speciation in Hemicordulia dragonflies (Odonata: Corduliidae)
FIGURES 24–25. Geographic (24) and altitudinal (25) distribution of H. africana n. sp. relative to large water bodies. Filled circles are known records (present paper), open circles forested localities near large waterbodies that have recently been intensively surveyed by V. Clausnitzer (pers. comm.), except Mbala by Pinhey (1984). Many sites in the region away from large water bodies have also been researched. A line connects each site to the altitude of the nearest large water body.
FIGURES 9. Parabrunetia celinea gen. et n in New isophlebioid dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 9. Parabrunetia celinea gen. et n. sp., holotype NIGPAS 133713, drawing of hind legs (scale bar represents 5 mm).
FIGURES 7. Parabrunetia celinea n. gen., n in New isophlebioid dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 7. Parabrunetia celinea n. gen., n. sp., holotype NIGPAS 133713, photograph (scale = 10 mm).
FIGURES 6. Amnifleckia splendida n in New isophlebioid dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 6. Amnifleckia splendida n. sp., holotype NIGPAS 133712, drawing of hind wing. Scale bar represents 5 mm.
FIGURES 4. Amnifleckia guttata n. gen., n in New isophlebioid dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 4. Amnifleckia guttata n. gen., n. sp., paratype NIGPAS 133711, drawing of fore wing (scale bar represents 5 mm).
FIGURES 5. Amnifleckia splendida n in New isophlebioid dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 5. Amnifleckia splendida n. sp., holotype NIGPAS 133712, photograph of hind wing (scale bar represents 10 mm.
FIGURES 3. Amnifleckia guttata n. gen., n in New isophlebioid dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 3. Amnifleckia guttata n. gen., n. sp., paratype NIGPAS 133711, photograph of fore wing (scale bar represents 10 mm).
FIGURES 1. Amnifleckia guttata n. gen., n in New isophlebioid dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 1. Amnifleckia guttata n. gen., n. sp., holotype D2834, photograph (scale bar represents 10 mm).
FIGURES 2. Amnifleckia guttata n. gen., n in New isophlebioid dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 2. Amnifleckia guttata n. gen., n. sp., holotype D2834. A. Forewings; B. Hindwings (scale bar represents 10 mm).
FIGURES 4–6 in A new genus of isophlebioid damsel-dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 4–6. Sinokaratawia prokopi gen. nov., sp. nov., allotype NIGP 142169 (female). 4, photograph (scale bar represents 10 mm). 5, drawing of forewing (scale bar represents 4 mm). 6, drawing of hind wing (scale bar represents 4 mm).
FIGURES 7–10 in A new genus of isophlebioid damsel-dragonflies (Odonata: Isophlebioptera: Campterophlebiidae) from the Middle Jurassic of China
FIGURES 7–10. Sinokaratawia prokopi gen. nov., sp. nov., 7–9, paratype NIGP 142168 (female). 7, photograph (scale bar represents 10 mm). 8, drawing of forewing (scale bar represents 4 mm). 9, drawing of hind wing (scale bar represents 4 mm). 10, paratype NIGP 142167 (male), photograph (scale bar represents 10 mm).
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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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.