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160 results for “Geraniaceae”
Geranium erianthum (Geraniaceae) - whole plant - in flower - general view
Image of Geranium erianthum (Geraniaceae) - whole plant - in flower - general view
Geranium erianthum (Geraniaceae) - stem - showing leaf bases
Image of Geranium erianthum (Geraniaceae) - stem - showing leaf bases
Geranium erianthum (Geraniaceae) - fruit - lateral or general close-up
Image of Geranium erianthum (Geraniaceae) - fruit - lateral or general close-up
Geranium erianthum (Geraniaceae) - stem - showing leaf bases
Image of Geranium erianthum (Geraniaceae) - stem - showing leaf bases
Geranium erianthum (Geraniaceae) - whole plant - in flower - general view
Image of Geranium erianthum (Geraniaceae) - whole plant - in flower - general view
Character displacement drives floral variation in Pelargonium (Geraniaceae) communities
<p><span>Interactions between plant community members are an underexplored driver of angiosperm floral variation. We investigate character displacement as a potential contributor to floral variation in <i>Pelargonium</i> communities. Pelargoniums all place pollen on the ventral sides of their pollinators, potentially leading to interspecific pollen transfer (IPT) in sympatry. We show that the positions of pollen placement and receipt are determined by anther and style exsertion lengths. Using field experiments, we demonstrate that heterospecific species experience high IPT if they have similar style lengths. In contrast, heterospecific species with greater style length differences experience less IPT. Using crosses, we show that IPT has negative consequences on seed set. In combination, these results suggest that character displacement in style length is likely to reduce IPT and increase female fitness in sympatry. Patterns of style length variation across twenty-nine different <i>Pelargonium</i> communities suggest that character displacement has occurred in multiple communities. Furthermore, analyses using a wide-ranging species pair show that style lengths are more different between sympatric populations than they are between allopatric populations. In addition to pollinators as agents of floral divergence, this study suggests that variation in <i>Pelargonium</i> community structure has driven style length variation through character displacement.Interactions between plant community members are an underexplored driver of angiosperm floral variation. We investigate character displacement as a potential contributor to floral variation in <i>Pelargonium</i> communities. Pelargoniums all place pollen on the ventral sides of their pollinators, potentially leading to interspecific pollen transfer (IPT) in sympatry. We show that the positions of pollen placement and receipt are determined by anther and style exsertion lengths. Using field experiments, we demonstrate that heterospecific species experience high IPT if they have similar style lengths. In contrast, heterospecific species with greater style length differences experience less IPT. Using crosses, we show that IPT has negative consequences on seed set. In combination, these results suggest that character displacement in style length is likely to reduce IPT and increase female fitness in sympatry. Patterns of style length variation across twenty-nine different <i>Pelargonium</i> communities suggest that character displacement has occurred in multiple communities. Furthermore, analyses using a wide-ranging species pair show that style lengths are more different between sympatric populations than they are between allopatric populations. In addition to pollinators as agents of floral divergence, this study suggests that variation in <i>Pelargonium</i> community structure has driven style length variation through character displacement.</span></p>
Data from: Divergent trait and environment relationships among parallel radiations in Pelargonium (Geraniaceae): a role for evolutionary legacy?
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Character displacement drives floral variation in Pelargonium (Geraniaceae) communities
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Data from: Patterns of genetic diversity reveal multiple introductions and recurrent founder effects during range expansion in invasive populations of Geranium carolinianum (Geraniaceae)
Genetic diversity, and thus the adaptive potential of invasive populations, is largely based on three factors: patterns of genetic diversity in the species' native range, the number and location of introductions, and the number of founding individuals per introduction. Specifically, reductions in genetic diversity ("founder effects") should be stronger for species with low within-population diversity in their native range and few introductions of few individuals to the invasive range. We test these predictions with Geranium carolinianum, a winter annual herb native to North America and invasive in China. We measure the extent of founder effects using allozymes and microsatellites, and ask whether this is consistent with its colonization history and patterns of diversity in the native range. In the native range, genetic diversity is higher and structure is lower than expected based on life-history traits. In China, our results provide evidence for multiple introductions near Nanjing, Jiangsu province, with subsequent range expansion to the west and south. Patterns of genetic diversity across China reveal weak founder effects that are driven largely by low- diversity populations at the expansion front, away from the introduction location. This suggests that reduced diversity in China has resulted from successive founder events during range expansion, and that the loss of genetic diversity in the Nanjing area was mitigated by multiple introductions from diverse source populations. This has implications for the future of G. carolinianum in China, as continued gene flow among populations should eventually increase genetic diversity within the more recently founded populations.
FIGURE 4 in Geranium janakianum (Geraniaceae), a new species from Uttarakhand, India
FIGURE 4. Scanning Electron Micrograph of G. janakianum. (A–B, E–F, I–J). A. Seed; B. Seed surface; E. Mericarp; F. Mericarp surface; I. Pollen; J. Pollen surface. Scanning Electron Micrograph of Geranium himalayense (C–D, G–H, K–L). C. Seed; D. Seed surface; G. Mericarp; H. Mericarp surface; K. Pollen; L. Pollen surface.
FIGURE 3 in Geranium janakianum (Geraniaceae), a new species from Uttarakhand, India
FIGURE 3. Scanning Electron Micrograph of G. janakianum. A. Sepal; B. Sepal surface; C. Bract; D. Bract surface; E. Pedicel; F. Pedicel surface; G. Petiole; H. Petiole surface.
FIGURE 2 in Geranium janakianum (Geraniaceae), a new species from Uttarakhand, India
FIGURE 2. Geranium janakianum (except C). A. Habit; B. Leaf; C. Leaf of G. himalayense; D. Staminal filaments; E. Petal; F. Petal basal surface; G–H. Fruit; I. Stipule tetrafid; J. Stipule bifid; K. Bud; L. Stomata; M. Flower; N. Flowering twig.
FIGURE 1. Geranium janakianum. A in Geranium janakianum (Geraniaceae), a new species from Uttarakhand, India
FIGURE 1. Geranium janakianum. A. Habit; B. Sepal; C. Mericarp; D, Stipule bifid; E, Stipule with tetrafid apex; F. Fruit; G. Flower; H. Nectaries; I. Petal basal abaxial surface; J. Petal; K. Seed; L. Staminal filament; M. Staminal filament basal abaxial surface.
Geranium maculatum (Geraniaceae) - inflorescence - lateral view of flower
Image of Geranium maculatum (Geraniaceae) - inflorescence - lateral view of flower
Geranium maculatum (Geraniaceae) - inflorescence - frontal view of flower
Image of Geranium maculatum (Geraniaceae) - inflorescence - frontal view of flower
Geranium maculatum (Geraniaceae) - whole plant - in flower - general view
Image of Geranium maculatum (Geraniaceae) - whole plant - in flower - general view
Geranium maculatum (Geraniaceae) - leaf - basal or on lower stem
Image of Geranium maculatum (Geraniaceae) - leaf - basal or on lower stem
Geranium maculatum (Geraniaceae) - inflorescence - whole - unspecified
Image of Geranium maculatum (Geraniaceae) - inflorescence - whole - unspecified
Geranium maculatum (Geraniaceae) - inflorescence - lateral view of flower
Image of Geranium maculatum (Geraniaceae) - inflorescence - lateral view of flower
Geranium maculatum (Geraniaceae) - inflorescence - frontal view of flower
Image of Geranium maculatum (Geraniaceae) - inflorescence - frontal view of flower
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Allen Brain Atlas
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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.