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7 results for “Halophila ovalis”
Data from: Clone configuration and spatial genetic structure of two Halophila ovalis populations with contrasting internode lengths
Fine-scale spatial genetic structure (SGS) is predominantly determined by gene flow. While sexually reproducing plants can disperse their genes through pollen and seed grains, clonal plants can additionally disperse genes through clonal growth. Plants' clonal reproduction strategy, however, often varies within and between species. Still, the effect of differential clonal reproduction strategy on fine-scale SGS remains somewhat unclear. Halophila ovalis is a fast-growing clonal seagrass, whose internode length (which defines a species' clonal reproduction strategy) varies among populations. Using eight polymorphic microsatellites, here we compare the genetic diversity, clonal structure and fine-scale SGS of two H. ovalis populations with contrasting internode lengths (Yingluo versus Xialongwei populations). We found moderate to high genotypic and allelic richness and heterozygosities in both populations. Compared to Xialongwei population, genetic and genotypic diversity was significantly lower in Yingluo population. Although their internode length was relatively short, clones of Yingluo population spread farther than those of Xialongwei population. Sexual-to-vegetative dispersal variance ratios were 34.6 and 445.5 in Yingluo and Xialongwei populations, respectively. In both populations, clonal growth significantly intensified the SGS, especially in short distance classes. The SGS at small distance classes were weaker in Yingluo than Xialongwei, in part, due to more intermingled distribution of genets and more extensive clonal expansion in the former population. Our results indicate that vegetative dispersal variance/distance, rather than internode length, plays a crucial role in shaping the fine-scale genetic structure.
FIGURE 5 in Two new species of the genus Daptonema Cobb, 1920 (Nematoda: Xyalidae) found in the monospecific Halophila ovalis patches within an intertidal mixed-species seagrass bed on the coast of the Andaman Sea, Thailand
FIGURE 5. Daptonema setihyalocella sp. n. Male (Holotype ZIHU 4081): A) Epidermal cells showing transparent appearance of the ventral chord in the anterior region. B) Epidermal cells showing transparent appearance of the dorsal chord in the anterior region. C) Amphid and epidermal cells showing transparent appearance of the lateral chord in the head region. D) Spicule and gubernaculum. Female (Allotype ZIHU 4085): E) Eggs and sperm cells in the uterus. F) Flat vulval gland. D, computer-integrated composite of original photomicrographs. A–E, left side view; F, right side view. Bar scales: A, B, 20 µm; C, D, F, 10 µm; E, 50 µm. Abbreviations: asterisk (*)—epidermal cell showing transparent appearance, amp—amphid, da —dorsal apophysis of gubernaculum, e—egg, gub —gubernaculum, lp—lateral piece of gubernaculum, ph—pharynx, s —sperm cell, spic —spicule, u —uterus, v —vulva, vgl —flat vulval gland.
FIGURE 2 in Two new species of the genus Daptonema Cobb, 1920 (Nematoda: Xyalidae) found in the monospecific Halophila ovalis patches within an intertidal mixed-species seagrass bed on the coast of the Andaman Sea, Thailand
FIGURE 2. Daptonema hyalocella sp. n. Male (Holotype ZIHU 3811; left side view): A) Entire body. B) Anterior region. C) Head region. D) Posterior region. E) Spicules and gubernaculum. Female (Allotype ZIHU 3817; left side view): F) Entire body. G) Vulval region. H) Posterior region. Bar scales: A, F, 100 µm; B, D, G, H: 20 µm; C, E, 10µm.
FIGURE 1 in Two new species of the genus Daptonema Cobb, 1920 (Nematoda: Xyalidae) found in the monospecific Halophila ovalis patches within an intertidal mixed-species seagrass bed on the coast of the Andaman Sea, Thailand
FIGURE 1. Location of the study site in the seagrass bed near Ban Pa Khlok, Phuket Province, Thailand. Asterisk, study site (8º 01' 20'' N, 98º 24' 40'' E).
FIGURE 3 in Two new species of the genus Daptonema Cobb, 1920 (Nematoda: Xyalidae) found in the monospecific Halophila ovalis patches within an intertidal mixed-species seagrass bed on the coast of the Andaman Sea, Thailand
FIGURE 3. Daptonema hyalocella sp. n. Male (A–C, Holotype ZIHU 3811; D, additional specimen): A) Epidermal cells showing transparent appearance of the dorsal and ventral chords in the head region. B) Amphid and epidermal cells showing transparent appearance of the lateral chord in the anterior region. C) Distal portion of the spicule and lateral piece of the gubernaculum. D) Epidermal cells showing transparent appearance of the dorsal, lateral and ventral chords in the pharyngeal region; transverse section, top is dorsal side. Female (Allotype ZIHU 3817): E) Epidermal cells showing transparent appearance of the dorsal and ventral chords in the anterior region. F) Uterus and postvulval sac in the vulval region. A–C, E, F, left side view; D, en face view. B, C, computer-integrated composite of original photomicrographs. Bar scales: A–D, 10 µm; E, F, 20 µm. Abbreviations: asterisk (*)—epidermal cell showing transparent appearance, amp—amphid, lp—lateral piece of gubernaculum, ph —pharynx, pvs —postvulval sac, spic—spicule, u —uterus, v—vulva.
FIGURE 4 in Two new species of the genus Daptonema Cobb, 1920 (Nematoda: Xyalidae) found in the monospecific Halophila ovalis patches within an intertidal mixed-species seagrass bed on the coast of the Andaman Sea, Thailand
FIGURE 4. Daptonema setihyalocella sp. n. Male (Holotype ZIHU 4081, left side view): A) Entire body. B) Anterior region. C) Head region. D) Posterior region. E) Spicule and gubernaculum. Female (Allotype ZIHU 4085; left side view): F) Entire body. G) Vulval region. H) Posterior region. Bar scales: A, F, 100 µm; B, D, H, 40 µm; C, E, 20 µm; G, 50 µm.
Data from: Clone configuration and spatial genetic structure of two Halophila ovalis populations with contrasting internode lengths
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