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8 results for “threatened plant species”
FIGURE 3. A–C,F,H–L,O–P Stevekenia nothocestri, D–E,G,M–N,Q Stevekenia aiea. A in A new endemic psyllid genus, Stevekenia gen. nov. (Hemiptera: Psylloidea, Triozidae), from the Hawaiian Islands with two new and rare species on threatened host plants in the endemic genus Nothocestrum (Solanaceae)
FIGURE 3. A–C,F,H–L,O–P Stevekenia nothocestri, D–E,G,M–N,Q Stevekenia aiea. A—male terminalia; B—sperm pump with comparative size of paramere; C—aedeagus; D—male terminalia; E—aedeagus; F,G—paramere (external surface); H—female terminalia; I—female subgenital plate (ventral view); J—female proctiger (dorsal view); K detail of dorsum of female proctiger indicating position of raised pores flanking anal ring; L female abdomen (with eggs) indicating long setae on sternites; M—female terminalia (with egg) indicating position of raised pore flanking anal ring, inset illustration of anal ring shape and circumanal pores; N—ovipositor; O–Q—eggs indicating pedicel, tail, plug-like structure, and surface cellular outgrowths (illustrated).
FIGURE 2. A–H, N, P–Q Stevekenia nothocestri, I–M,O,R Stevekenia aiea. A in A new endemic psyllid genus, Stevekenia gen. nov. (Hemiptera: Psylloidea, Triozidae), from the Hawaiian Islands with two new and rare species on threatened host plants in the endemic genus Nothocestrum (Solanaceae)
FIGURE 2. A–H, N, P–Q Stevekenia nothocestri, I–M,O,R Stevekenia aiea. A—head (dorsal view above, ventral view below) indicating position of posterior eye rim extensions (outlined), lateral ocelli, and anterior vertex extensions (in dorsal view) and position of medial ocellus below vertex extensions (in ventral view); B—head (dorso-anterior view) indicating short vertex with anterior vertex extensions; C—head (ventro-anterior view); D—head (lateral view) indicating position of posterior eye rim extension; E—single disk rhinarium on antennal segment 6 (illustration inset); F—multiple disk rhinaria on antennal segment 4; G—head and antenna; H—proboscis; I—head (dorsal view above, ventral view below) indicating position of posterior eye rim extensions, lateral ocelli, and anterior vertex extensions (in dorsal view) and position of medial ocellus below vertex extensions (in ventral view); J—detail of diverging anterior vertex extensions; K—head and antenna; L—proboscis; M,N—hind leg; O,P—genual spine at base of hind tibia; Q—apical tibial spurs and tarsi; R—detail of pair of apical tibial spurs not conjoined basally; S—detail of hind tarsal claws and arolium.
FIGURE 1. A–G Stevekenia nothocestri, H–L Stevekenia aiea. A in A new endemic psyllid genus, Stevekenia gen. nov. (Hemiptera: Psylloidea, Triozidae), from the Hawaiian Islands with two new and rare species on threatened host plants in the endemic genus Nothocestrum (Solanaceae)
FIGURE 1. A–G Stevekenia nothocestri, H–L Stevekenia aiea. A—fore wing; B—hind wing; C—detail of fore wing cell m2 indicating position of two clusters of marginal radular spines, inset illustrates disbursed distribution of spines; D—detail of long setae on fore wing ventral margin and veins; E—dorsum of thorax; F—female habitus (cluster of eggs in abdomen); Ghead and thorax; H—fore wing (male); I—fore wing (female); J—hind wing (female); K—detail of fore wing cells m1 and m2 indicating position of single clusters of marginal radular spines towards posterior in each cell, inset illustrates narrow distribution of spines; L—detail of long setae on fore wing ventral margin and veins.
FIGURE 1. Cardamine panatohea. A. Mature plant with prostrate inflorescences. B. Plant with rosette leaves. C. Rosette leaves. D in Cardamine panatohea (Brassicaceae), a new, threatened, alpine species from New Zealand
FIGURE 1. Cardamine panatohea. A. Mature plant with prostrate inflorescences. B. Plant with rosette leaves. C. Rosette leaves. D. Hairs on leaf adaxial surface. E. Flowers top view. F. Flowers side view. G. Inflorescence with axillary rosettes. H. Inflorescence with siliques. Scale bars: C, G = 10 mm; D = 5 mm.
Projected climate change threatens significant range contraction of Cochemiea halei (Cactaceae), an island endemic, serpentine adapted plant species at risk of extinction
<p>Threats faced by narrowly distributed endemic plant species in the face of the Earth's sixth mass extinction and climate change exposure are especially severe for taxa on islands. We investigated the current and projected distribution and range changes of Cochemiea halei, an island endemic cactus. This taxon is of conservation concern, currently listed as vulnerable on the International Union for the Conservation of Nature Red List and as a species of special concern under Mexican federal law.</p> <p>The goals of this study are to 1). identify the correlations between climate variables and current suitable habitat for C. halei; 2). determine if the species is a serpentine endemic or has a facultative relationship with ultramafic soils; 3). predict range changes of the species based on climate change scenarios.</p> <p>Location: The island archipelago in Bahía Magdalena on the Pacific coast, Baja California Sur, Mexico.</p> <p>Main conclusions: The occurrence of the species is found to be strongly correlated with ultramafic soils. The most important climate predictor for habitat suitability is annual temperature range. The species is predicted to undergo range contractions from 21% to 53%, depending on the severity and duration of exposure to climate change. The broader implications for a wide range of narrowly adapted, threatened and endemic plant species indicate an urgent need for threat assessment based on habitat suitability and climate change modeling.</p>
SNP dataset for the threatened plant species Dinizia jueirana-facao (Fabaceae)
<p>By performing sensitivity analyses, we empirically investigated how decisions about the percentage of missing data (MD) and the minor allele frequency (MAF) set in bioinformatic processing of genomic data affect direct (i.e., parentage analysis) and indirect (i.e., fine-scale spatial genetic structure - SGS) gene flow estimates. We focus specification on these manifestations in small plant populations, and specifically, in the rare tropical plant species <i>Dinizia jueirana-facao</i>, where assumptions implicit to analytical procedures for accurate estimates of gene flow may not hold. Avoiding biases in dispersal estimates are essential given this species is facing extinction risks due to habitat loss, and so we also investigate the effects of forest fragmentation on the accuracy of dispersal estimates under different filtering criteria by testing for recent decrease in the scale of gene flow. Our sensitivity analyses demonstrate that gene flow estimates are robust to different setting of MAF (0.05 to 0.35) and MD (0 to 20%). Comparing the direct and indirect estimates of dispersal, we find that contemporary estimates of gene dispersal distance (<i>σ<sub>r</sub></i><sub>t</sub> = 41.8 m) was ~ fourfold smaller than the historical estimates, supporting the hypothesis of a temporal shift in the scale of gene flow in <i>D. jueirana-facao</i>, which is consistent with predictions based on recent, dramatic forest fragmentation process. While we identified settings for filtering genomic data to avoid biases in gene flow estimates, we stress that there is no 'rule of thumb' for bioinformatic filtering or that relying on default program settings is advisable. Instead, we suggest that the approach implemented here be applied independently in each separate empirical study to confirm appropriate settings to obtain unbiased population genetics estimates.</p>
SNP dataset for the threatened plant species Dinizia jueirana-facao (Fabaceae)
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Projected climate change threatens significant range contraction of Cochemiea halei (Cactaceae), an island endemic, serpentine adapted plant species at risk of extinction
Open the record for dataset details and reuse information.
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