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9,937 results for “Endemicity”
FIGURES 1–2 in Cytotaxonomy of the endemic Karst and Danxia ferns in Adiantum (Pteridaceae)
FIGURES 1–2. Photomicrographs (left) and explanatory diagrams (right) of chromosomes of A. juxtapositum (2n = 64). 1: individuals collected in GSD (WAH029); 2: individuals collected in HCZ (wah20191115001). All short names were listed in Table 1.
FIGURE 3 in Macroscepis sinalobolana (Apocynaceae, Asclepiadoideae, Gonolobeae) a new and endemic species to Sinaloa, México
FIGURE 3. Known distribution of Macroscepis sinalobolana and morphologically related species M. diademata and M. stevensii.
FIGURE 2. Comparison between Macroscepis sinalobolana and similar species. A. Macroscepis sinalobolana inflorescence. B in Macroscepis sinalobolana (Apocynaceae, Asclepiadoideae, Gonolobeae) a new and endemic species to Sinaloa, México
FIGURE 2. Comparison between Macroscepis sinalobolana and similar species. A. Macroscepis sinalobolana inflorescence. B. Section of the flower. C. Macroscepis diademata. D. Section of the flower. E. Macroscepis stevensii. Abbreviations: A: anther, CG: gynostegial corona, a: apex, i: insertion, SH: stylar head. Photos: J. Pío-León (A), L.O. Alvarado-Cárdenas (B–D), P. Aguilar (E).
FIGURE 1. Macroscepis sinalobolana. A. Leaf. B in Macroscepis sinalobolana (Apocynaceae, Asclepiadoideae, Gonolobeae) a new and endemic species to Sinaloa, México
FIGURE 1. Macroscepis sinalobolana. A. Leaf. B. Lateral view of the flowers. C. Inflorescences. D. Section of the flower showed the gynostegium and the gynostegial corona. E. Pollinarium. F. Fruits. G. Seeds without coma. H. Ants (Formicidae) visiting the flowers. Abbreviations: GC: gynostegial corona, FA: faucal annulus, LE: pollinia laterally excavated. Photos: J. Pío-León
FIGURE 4 in Two new endemic species of blueberry (Vaccinium L., Ericaceae) from Luzon and Mindanao islands, Philippines
FIGURE 4. Holotype of Vaccinium jubatum M.N.Tamayo & P.W.Fritsch (BRIT BRIT26945). Image courtesy of the Botanical Research Institute of Texas.
FIGURE 3. Vaccinium jubatum. A. Flowering branch. B in Two new endemic species of blueberry (Vaccinium L., Ericaceae) from Luzon and Mindanao islands, Philippines
FIGURE 3. Vaccinium jubatum. A. Flowering branch. B. Adaxial view of part of a leaf showing the marginal glands. C. Flower. D. Flower (corolla removed) exposing the style and disk. E. Lateral view of stamen. F. Ventral view of stamen. Illustration by Maverick N. Tamayo.
FIGURE 2 in Two new endemic species of blueberry (Vaccinium L., Ericaceae) from Luzon and Mindanao islands, Philippines
FIGURE 2. Holotype of Vaccinium burburan M.N.Tamayo & P.W.Fritsch (BRIT BRIT26917). Image courtesy of the Botanical Research Institute of Texas.
FIGURE 1. Vaccinium burburan. A. Flowering branch. B. Stem indumentum. C. Flower. D in Two new endemic species of blueberry (Vaccinium L., Ericaceae) from Luzon and Mindanao islands, Philippines
FIGURE 1. Vaccinium burburan. A. Flowering branch. B. Stem indumentum. C. Flower. D. Flower (corolla removed) exposing the disk. E. Ventral view of stamen. F. Dorsal view of stamen. G. Fruit. Illustration by Maverick N. Tamayo.
Conservation genetics of an island-endemic lizard: low Ne and the critical role of intermediate temperatures for genetic connectivity
<p>Island populations are at higher risk of extinction than mainland populations. Therefore, understanding the factors that facilitate connectivity is particularly pressing for the conservation of island taxa. <i>Sceloporus occidentalis becki</i>, the Island Fence Lizard, is an endemic taxon restricted to the Northern Channel Islands, part of a nearshore archipelago in Southern California, USA. Since the Last Glacial Maximum, fence lizard habitat on the Northern Channel Islands has decreased with rising sea levels and increasing temperatures that have reduced the availability of woody vegetation. More recently, the introduction (and subsequent removal) of invasive ungulates over the last 170 years and recovery of vegetation has resulted in further dramatic habitat modification. Given the potential for genetic bottlenecks, the history of habitat alteration, and topographic and landscape complexity, we used landscape and population genetic approaches to characterize patterns of genetic diversity and structure of Island Fence Lizards on Santa Cruz Island, the largest of the Northern Channel Islands. Our analyses revealed shallow population structure across the island, low effective population size (<i>N<sub>e</sub></i> = ~200), and evidence for a recent genetic bottleneck. Landscape genetic analyses showed that connectivity is facilitated by tree canopy cover and shrubland, as well as by intermediate temperatures, emphasizing the importance of woody vegetation and habitats with variable thermal regimes as the climate warms. Combined, these population and landscape genetic analyses suggest that the Island Fence Lizard is of greater conservation concern than currently appreciated, and increased conservation management focus is warranted for this island endemic.</p>
An insect-pollinated species in a wind-pollinated genus: case study of the endemic plant, Laramie chickensage (Artemisia simplex)
<p><em>Artemisia simplex</em><span> (Laramie chickensage) is an imperiled, endemic plant in southeastern Wyoming, USA. To fill critical information gaps, we measured its seed viability and pollination mechanisms, measures that are lacking for many rare and endemic plants yet critical for the perpetuation of species. </span><em>Artemisia simplex</em><span> cover varied among sites and occupied 5.5% (range: 1.3–14.6%) of the area on average. This unique plant typically produced viable seeds under ambient conditions but did not self-pollinate. Characteristics of the flower and pollen suggest that </span><em>A. simplex</em><span> is primarily animal-pollinated, and we found that both wind and animals transported pollen to the plant, but wind alone produced fewer seeds. Members of the sagebrush genus are widely known to be wind-pollinated; however, we demonstrated that this species of sagebrush is largely animal</span><span class="ins cts-1">-</span><span>pollinated. </span><span class="ins cts-1">Plant c</span><span>onservation and management plans must consider the mode of pollen transfer, especially when considering the decline of insect pollinators. Pollination provides information about the persistence of plant populations through sexual reproduction, which produces the genetic variation needed for healthy populations.</span></p>
FIGURE 2 in Kalanchoe gideonsmithii (K. subg. Kalanchoe; Crassulaceae subfam. Kalanchooideae), a further new species endemic to the Maputaland-Pondoland Region of Endemism in KwaZulu-Natal, eastern South Africa
FIGURE 2. Kalanchoe decumbens from northeastern KwaZulu-Natal and Eswatini (A, B). A. Leaves are light green, narrowly oblong, rounded at apex, and often curve up- and inwards. B. Flowers cinnabar-red. In K. decumbens the corolla lobes are usually slightly broader than in K. rotundifolia. Kalanchoe rotundifolia (C, D). C. The leaves of this form are cymbiform to slightly obovate in outline. D. Flowers are most usually green basally at the level of the ovary. Scale bars: A: 30 mm; B: 10 mm; C: 25 mm; D: 10 mm. Photograph credits: A, B. Gideon F. Smith; C, D. Neil R. Crouch.
FIGURE 1. Kalanchoe gideonsmithii. A in Kalanchoe gideonsmithii (K. subg. Kalanchoe; Crassulaceae subfam. Kalanchooideae), a further new species endemic to the Maputaland-Pondoland Region of Endemism in KwaZulu-Natal, eastern South Africa
FIGURE 1. Kalanchoe gideonsmithii. A. In habitat near Bishopstowe, KwaZulu-Natal province, South Africa. B. Turgid leaves in the rainy season. C. Inflorescence. D. Bluish purple-infused flower (left) and inflorescence (right). The upper floral tube is consistently dark orange to deep red, with the centres of the lobes sometimes slightly yellowish-infused. The distal part of the corolla tube and proximal part of the corolla lobes invariably become tightly twisted post-anthesis. E. Habitat at type locality, Bishopstowe. F. Prof. Gideon F. Smith for whom K. gideonsmithii is named. Scale bars: A: 80 mm; B: 10 mm; C: 13 mm; D: 13 mm. Photograph credits: A, E. Neil R. Crouch; B–D. Gideon F. Smith; F. Kenneth Oberlander.
FIGURE 4. A–D in Novelties in Microlicia (Melastomataceae, Lavoisiereae) endemic to the campo rupestre of Guiné, Chapada Diamantina, Bahia, Brazil
FIGURE 4. A–D. Microlicia pataroi in the field. A. Branch terminating in a green floral bud. B. Branch terminating in a floral bud at pre-anthesis. C. Close up photo of a flower at anthesis. D. A fruiting (left) and a sterile (right) branches. E. Landscape with campo rupestre along the trail to the Vale do Pati, Guiné district, Mucugê (Bahia, Brazil), the type locality of M. bicolor and M. pataroi. Photographs: A–D by R. Pacifico, E by F. Almeda. Vouchers: A–D, Pacifico et al. 704, the type collection.
FIGURE 1. Microlicia bicolor. A. Habit. B in Novelties in Microlicia (Melastomataceae, Lavoisiereae) endemic to the campo rupestre of Guiné, Chapada Diamantina, Bahia, Brazil
FIGURE 1. Microlicia bicolor. A. Habit. B. Leaf adaxial (left) and abaxial (right) surfaces C. Branchlet terminating in a floral bud. D. Apical branch terminating in a flower at anthesis. E. Flowering hypanthium and calyx lobes. F. petal in adaxial view. G. Antepetalous (left) and antesepalous (right) stamens. H. Gynoecium. I. Ovary in cross-section. J. Capsule enveloped by the hypanthium. Drawn from the paratype, Almeda et al. 10747 (HUEM).
FIGURE 10 in Anatomical and palynological comparison of three endemic species of Teucrium sect. Teucrium of Turkey
FIGURE 10. Box Plots of examined palynological characters (P: polar axis, E: equatorial axis, Clt: colpus width, Clg: colpus length, t: apocolpium, Amb: pollen grains measurements of at polar view.
FIGURE 9 in Anatomical and palynological comparison of three endemic species of Teucrium sect. Teucrium of Turkey
FIGURE 9. Box Plots of examined midrib characters (Mdcolw: collenchyma cell width, Mdcoll: collenchyma cell length, dpw: parenchyma cells width, Mdbscw: bundle sheath cells width, Mdbscl: bundle sheath cells length)
FIGURE 8 in Anatomical and palynological comparison of three endemic species of Teucrium sect. Teucrium of Turkey
FIGURE 8. Box Plots of examined leaf characters (Luew: upper epidermis width, Luel: upper epidermis length, Llew: lower epidermis width, Llel: lower epidermis length, Luecuw: upper cuticula thickness, Llecuw: lower cuticula thickness, Lmesow: mesophyll cells width, Lppw: palisade parenchyma cells width, Lppl: palisade parenchyma cells length, Lspw: sponge parenchyma cells width)
FIGURE 7 in Anatomical and palynological comparison of three endemic species of Teucrium sect. Teucrium of Turkey
FIGURE 7. Box Plots of examined stem characters (Cuw: cuticula thickness, Sepw: epidermis cell width, Sepl: epidermis cell length, Scorw: cortex cell width, Scorl: cortex cell length, Stracw: trachea width, Sendow: endodermis width, Sendo: endodermis length, Scolw: collenchyma cell width, Piw: pith cell width).
FIGURE 5. Teucrium pestalozzae A in Anatomical and palynological comparison of three endemic species of Teucrium sect. Teucrium of Turkey
FIGURE 5. Teucrium pestalozzae A. Pollen grain general view with LM, B. Pollen equatorial view with SEM, C. Pollen Polar view with SEM, D. Pollen surface with SEM.
FIGURE 4. Teucrium ekimii A in Anatomical and palynological comparison of three endemic species of Teucrium sect. Teucrium of Turkey
FIGURE 4. Teucrium ekimii A. Pollen grain general view with LM, B. Pollen equatorial view with SEM, C. Pollen Polar view with SEM, D. Pollen surface with SEM.
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