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285 results for “hummingbirds”
FIGURE 9 in Five new feather mites of the subfamily Pterodectinae (Acariformes: Astigmata: Proctophyllodidae) from passerines and hummingbirds (Aves) of Brazil
FIGURE 9. Tyrannidectes synallaxis sp. n., legs. A–D—male legs I–IV, respectively; E—female tarsus III; F—female tarsus IV.
FIGURE 3 in Five new feather mites of the subfamily Pterodectinae (Acariformes: Astigmata: Proctophyllodidae) from passerines and hummingbirds (Aves) of Brazil
FIGURE 3. Amerodectes longifuscus sp. n., legs A–D—male legs I–IV, respectively; E—female tarsus III; F—female tarsus IV.
FIGURE 16 in Five new feather mites of the subfamily Pterodectinae (Acariformes: Astigmata: Proctophyllodidae) from passerines and hummingbirds (Aves) of Brazil
FIGURE 16. Dorsal view of female lobar region: A—Amerodectes longifuscus sp. n.; B—Amerodectes vireonis sp. n.; C— Tyrannidectes synallaxis sp. n.; D—Trochilodectes willisi sp. n.; E—Xynonodectes phaethornis sp. n.
FIGURE 6 in Five new feather mites of the subfamily Pterodectinae (Acariformes: Astigmata: Proctophyllodidae) from passerines and hummingbirds (Aves) of Brazil
FIGURE 6. Amerodectes vireonis sp. n., legs. A–D—male legs I–IV, respectively; E—female tarsus III; F—female tarsus IV.
FIGURE 15 in Five new feather mites of the subfamily Pterodectinae (Acariformes: Astigmata: Proctophyllodidae) from passerines and hummingbirds (Aves) of Brazil
FIGURE 15. Xynonodectes phaethornis sp. n. A–D—male legs I–IV, respectively; E—female tarsus III; F—female tarsus IV; G—female spermatheca.
FIGURE 17 in Five new feather mites of the subfamily Pterodectinae (Acariformes: Astigmata: Proctophyllodidae) from passerines and hummingbirds (Aves) of Brazil
FIGURE 17. Details of genital apparatus. A–E—aedeagus: A—Amerodectes longifuscus sp. n.; B—Amerodectes vireonis sp. n.; C—Tyrannidectes synallaxis sp. n.; D—Trochilodectes willisi sp. n.; E—Xynonodectes phaethornis sp. n.; F–H—female spermatheca: F—Amerodectes longifuscus sp. n.; G—Amerodectes vireonis sp. n.; H—Tyrannidectes synallaxis sp. n.
FIGURE 8 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 8. Two views of a young male of Campylopterus calcirupicola captured on 18 July 2006 in the Fazenda Corredor (880 m asl), municipality of Bocaiúva, Minas Gerais, Brazil (DZUFMG 5005). Photographs by LEL.
FIGURE 5 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 5. Correlation between elevation of the collection site and PC1 values for Campylopterus largipennis diamantinensis (specimens collected in high altitude "campos rupestres") and specimens collected in dry forest at lower elevations.
FIGURE 9 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 9. Geographic distribution of the examined specimens of the Campylopterus largipennis complex. Light grey areas are covered by forests (Olson et al. 2001). Dark grey areas indicate elevations above 1,500 m asl. Letters "T" indicate type localities.
FIGURE 2 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 2. Scatterplots of the first versus the second principal component scores of a Principal Component Analysis (Varimax rotated) of morphometric variables measured from specimens of the Campylopterus largipennis complex. There is a clear-cut separation of the complex into two distinct groups (solid ellipses). The first group is formed by specimens showing short and greyish LTTs (left). The second group is formed by specimens showing long and white LTTs (right).
FIGURE 4 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 4. Box plot comparisons of the length of the light tip of the four outer rectrices (LTT-1 to LTT-4) among specimens of Campylopterus largipennis aequatorialis and C. l. obscurus found in each of the major Amazonian areas of endemism. Sample sizes are: Napo (61♂, 38♀), Inambari (71♂, 56♀), Rondônia (35♂, 13♀), Tapajós (11♂, 18♀), Xingu (14♂, 11♀), and Belém (58♂, 43♀).
FIGURE 7 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 7. The newly described Campylopterus calcirupicola (Dry-forest Sabrewing) from eastern Brazilian tropical dry forests. From an original watercolor painting by Walter Gam.
FIGURE 6 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 6. Under right side of tail showing coloration pattern in taxa of the Campylopterus largipennis complex. Illustration composed of photographs of several museum specimens collected in the following areas of endemism: C. l. obscurus (Belém), C. l. aequatorialis (Napo), C. l. largipennis (Guiana), C. l. diamantinensis (Central Brazilian hills and tablelands) and "Dry forest" specimens (deciduous forests of Minas Gerais and Goiás). Photographs by LEL.
FIGURE 1 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 1. Sexual dimorphism in the shape and size of bill (A) and in wing shape (B) of taxa in the Campylopterus largipennis complex. In both pictures male is presented above female. (A) male (MZUSP 99025, paratype) and female (MZUSP 99024, holotype). (B) male (DZUFMG 5007) and female (DZUFMG 7170). Photographs by LEL.
FIGURE 11 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 11. The typical habitat of Campylopterus calcirupicola. Dry forest growing on limestone outcrop during the wet (left, late December) and dry (right, early October) seasons. Photographs taken in the municipality of Januária, Minas Gerais, Brazil, by LEL.
FIGURE 3 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 3. Scatterplots of the first versus the second principal component scores of a Principal Component Analysis (unrotated) of morphometric variables measured from specimens of the Campylopterus largipennis complex collected in eastern Brazil. Montane birds (C. l. diamantinensis, n = 33) are depicted by triangles and dry forest birds (n = 20) are depicted by squares. Solid symbols indicate males, and open symbols indicate females.
FIGURE 10 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 10. Detailed geographic distribution of Campylopterus calcirupicola (squares) and C. diamantinensis (triangles) in the state of Minas Gerais, eastern Brazil. In addition to the specimens examined, sight records are indicated by a dot inside the symbol. Higher altitudes are indicated by darker grey shading.
FIGURE 12 in A cryptic new species of hummingbird of the Campylopterus largipennis complex (Aves: Trochilidae)
FIGURE 12. The typical habitat of Campylopterus diamantinensis. Clockwise, from upper left: Serra do Breu (dry season), Parque Nacional das Sempre Vivas (wet season), and two pictures from Serra do Cipó (wet season). All photographs taken in Minas Gerais, Brazil, by Guilherme H.S. Freitas.
Demographic mechanisms and anthropogenic drivers of contrasting population dynamics of hummingbirds
<p>Conserving species requires knowledge of demographic rates (survival, recruitment) that govern population dynamics to allow the allocation of limited resources to the most vulnerable stages of target species' life cycles. Additionally, quantifying drivers of demographic change facilitates the enactment of specific remediation strategies. However, knowledge gaps persist in how similar environmental changes lead to contrasting population dynamics through demographic rates. For sympatric hummingbird species, the population of urban-associated partial-migrant Anna's hummigbird (<em>Calypte anna</em>) has increased, yet the populations of Neotropical migrants including rufous, calliope, and black-chinned hummingbirds have decreased. Here, we developed an integrated population model to jointly analyze 25 years of mark-recapture data and population survey data for these four species. We examined the contributions of demographic rates on population growth and evaluated the effects of anthropogenic stressors including human population density and crop cover on demographic change in relation to species' life histories. While recruitment appeared to drive the population increase of urban-associated Anna's hummingbirds, decreases in juvenile survival contributed most strongly to population declines of Neotropical migrants and highlight a potentially vulnerable phase in their life-history. Moreover, rufous hummingbird adult and juvenile survival rates were negatively impacted by human population density. Mitigating threats associated with intensively modified anthropogenic environments is a promising avenue for slowing further hummingbird population loss. Overall, our model grants critical insight into how anthropogenic modification of habitat affects the population dynamics of species of conservation concern.</p>
The population genetics of non-migratory Allen's Hummingbird (Selasphorus sasin sedentarius) following a recent mainland colonization
<p>Allen's Hummingbird comprises two subspecies, one migratory (<i>Selasphorus sasin sasin</i>) and one non-migratory (<i>S. s. sedentarius</i>). The non-migratory subspecies, previously endemic to the California Channel Islands, apparently colonized the California mainland on the Palos Verdes Peninsula some time before 1970, and now breeds throughout coastal southern California. We sequenced and compared populations of mainland non-migratory Allen's Hummingbird to Channel Island populations from Santa Catalina, San Clemente, and Santa Cruz Island. We found no evidence of founder effects on the mainland population. Values of nucleotide diversity on the Channel Islands were lower than those on the mainland. There were low levels of divergence between the Channel Islands and the mainland, although Santa Cruz Island was the most genetically distinct. Ecological niche models showed that rainfall and temperature variables on the Channel Islands are similar in the Los Angeles basin, and predicted continued expansion of non-migratory Allen's Hummingbird north along the coast and inland. We also reviewed previous genetic studies of vertebrate species found on the Channel Islands and mainland, and showed that broad conclusions regarding island-mainland patterns remain elusive. Challenges include the idiosyncratic nature of colonization itself as well as the lack of a comprehensive approach that incorporates similar markers and sampling strategies across taxa, which, within the context of a comparative study of island-mainland relationships, may lead to inconsistent results.</p>
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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
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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.