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175 results for “Viviparity”
Figure 6. Concatenated COI and 16S in Evolutionary systematics of the viviparous gastropod Sermyla (Gastropoda: Cerithioidea: Thiaridae), with the description of a new species
Figure 6. Concatenated COI and 16S mtDNA-phylogeny of Sermyla kupaensis, S. riquetii and S. carbonata and other Australian thiarid species, as well as two Paludomus siamensis as outgroup, with numbers at nodes refering to maximum likelihood bootstrap values (left) and Bayesian posterior probabilities (right). Symbols along branches indicate the mode of reproduction: squares = euviviparous; circles = ovoviviparous. Abbreviations refer to sampling locations: HS = Howard Springs; GC = Gulf of Carpentaria; RR = Roper River; WA = Western Australia (Bundara Sinkhole); BAL = Bali; VIE = Vietnam; THA = Thailand.
Figure 9 in Evolutionary systematics of the viviparous gastropod Sermyla (Gastropoda: Cerithioidea: Thiaridae), with the description of a new species
Figure 9. Structure analysis of AFLP data based on five primer combinations and a matrix corrected by AMARE for the reduced dataset of S. carbonata in Australia. Results have been assigned to their geographical localities.
Figure 2 in Evolutionary systematics of the viviparous gastropod Sermyla (Gastropoda: Cerithioidea: Thiaridae), with the description of a new species
Figure 2. Geographic range of S. riquetii (circles), S. kupaensis (hexagon) and S. carbonata (squares) with a colour-code for the different drainage systems in Australia. Black squares: sequenced, ethanol preserved material of S. carbonata; white squares: dry shells of S. carbonata; black circles: sequenced, ethanol preserved material of S. riquetii; white circles: dry shells of S. riquetii; black hexagon: sequenced, ethanol-preserved material of S. kupaensis; white hexagon: dry shells of S. kupaensis; five-pointed stars: type localities of 1 = S. riquetii, 2 = S. kupaensis, 3 = S. carbonata, 4 = M. venustula.
Figure 3 in Evolutionary systematics of the viviparous gastropod Sermyla (Gastropoda: Cerithioidea: Thiaridae), with the description of a new species
Figure 3. Shell measurements and positions of landmarks for morphological analyses of the shell of Sermyla species. A, shell measurements for biometrical analysis: ShH, shell height; L3WH, height of the last three whorls; LWH, last whorl height; AW, width of the aperture; AH, height of the aperture; ShW, width of the shell. B, landmarks set for the geometric morphometric analysis.
Figure 4 in Evolutionary systematics of the viviparous gastropod Sermyla (Gastropoda: Cerithioidea: Thiaridae), with the description of a new species
Figure 4. Shape differences of populations of S. riquetii, S. carbonata and S. kupaensis. Principle component analysis (PCA) for the configuration of 15 landmarks of S. kupaensis from Sulawesi, S. riquetii from Bali, Vietnam and Thailand, S. cf. riquetii from Australia, as well as S. carbonata in the different drainage systems of Australia. Five-pointed star: syntype of S. riquetii; nine-pointed star: syntypes of S. carbonata; six-pointed stars: syntypes of M. venustula; triangle tip down: holotype of S. prognata.
Figure 1. A in Evolutionary systematics of the viviparous gastropod Sermyla (Gastropoda: Cerithioidea: Thiaridae), with the description of a new species
Figure 1. A–AB, shell morphology of Sermyla: A–O, Sermyla riquetii; P–T, Sermyla kupaensis; U–AB, Sermyla carbonata. A, syntype of Sermyla riquetii (Grateloupe, 1840), 'Batavia' (BMNH 1907.11.22.40); B, syntype of Sermyla riquetii (Grateloupe, 1840), 'Batavia' (BMNH 1907.11.22.41); C, syntype of Melania harpula Dunker, 1844 (ZMB 109669); D, syntype of Melania mitra Dunker, 1844 (ZMB 109670); E, original drawing of Melania semicostata Philippi 1847; F, syntype of Melania tornatella Lea & Lea, 1851 (BMNH 1978155); G, syntype of Melania sculpta Souleyet, 1852 (BMNH 1854.7.24.381); H, holotype of Sermyla kowloonensis Chen, 1943 (USNM 48041); I, S. riquetii from Bali, Gumbrih River (ZMB 106474-3); J, S. riquetii from Thailand, Puek Tian Beach (ZMB 107883-11); K, S. riquetii from Thailand, Perchaburi (ZMB 127817-2); L, S. riquetii from Thailand, Samut Songkhram (ZMB 127818-2); M, S. riquetii from Vietnam, Hue (ZMB 114421–5); N, S. cf. riquetii from Australia: QLD, Caloundra (AMS C.3215-1); O, S. cf. riquetii from Australia: QLD, Caloundra (AMS C.3215-2); P, holotype of Sermyla kupaensis from Indonesia, Kupa River (MZB Gst. 12.191); Q, paratype of Sermyla kupaensis ZMB 191388-4); R, paratype of Sermyla kupaensis (ZMB 191388-10); S, paratype of Sermyla kupaensis (ZMB 191388-5); T, paratype of Sermyla kupaensis (ZMB 191388-7); U, syntype of Sermyla carbonata (Reeve, 1859), 'Port Essington' (BMNH 2001.0762); V, syntype of Melania venustula Brot, 1877, 'Port Denison' (MNHG, no number); W, holotype of Sermylasma prognata Iredale, 1943, Australia, Victoria River (BMNH 1857.9.30.8-1); X, S. carbonata, Australia: Bundara Sinkhole (BES 10048); Y, S. carbonata, Australia, Howard Springs (ZMB 107630–2); Z, S. carbonata, Australia, Roper River (ZMB 107616-1); AA, S. carbonata, Australia, Roper Bar (ZMB 192017-1); AB, S. carbonata, Australia, Norman River (107209-5).
FIGURES 1–4. Brachyunguis dendrostellerae Kadyrbekov, 2014 and B. monstratus Kadyrbekov, 1999. Brachyunguis dendrostellerae. Apterous viviparous female. 1 in Two species of Brachyunguis (Hemiptera: Aphididae) new to Iran, and a key to the Iranian species of this genus
FIGURES 1–4. Brachyunguis dendrostellerae Kadyrbekov, 2014 and B. monstratus Kadyrbekov, 1999. Brachyunguis dendrostellerae. Apterous viviparous female. 1. Habitus of less pigmented specimen (bar: 500 μm); 2. Habitus of more pigmented specimen (bar: 500 μm); Alata viviparous female. 3. Habitus (bar: 500 μm); 4. Brachyunguis monstratus. Apterous viviparous female. 4. Habitus (bar: 500 μm).
FIGURES 20–24. Macrosiphum hartigi Hille Ris Lambers, 1947. apterous viviparous female. 20 in A new Caryophyllaceae-feeding species of Macrosiphum (Hemiptera: Aphididae) in Republic of Georgia, and a redescription of Macrosiphum hartigi Hille Ris Lambers
FIGURES 20–24. Macrosiphum hartigi Hille Ris Lambers, 1947. apterous viviparous female. 20. ANT III (bar: 200 µm); 21. Rostral segments II–V (bar: 200 µm); 22. Tarsus (bar: 200 µm); 23. Cauda (bar: 200 µm); 24. SIPH (bar: 200 µm).
Fig. 1 in High Fecundity, Rapid Development and Selfing Ability in Three Species of Viviparous Land Snails Phaedusinae (Gastropoda: Stylommatophora: Clausiliidae) from East Asia
Fig. 1. Tauphaedusa sheridani. (A) adults (F1 generation); (B) neonates; (C) clausilia; (D-E) - eggs and embryos from dissected adults. Scale bar = 1 mm. © 2018 Academia Sinica, Taiwan
Fig. 5 in High Fecundity, Rapid Development and Selfing Ability in Three Species of Viviparous Land Snails Phaedusinae (Gastropoda: Stylommatophora: Clausiliidae) from East Asia
Fig. 5. Comparison of the selected life-history traits in T. sheridani (SHE), T. tau (TAU), and S. jacobiana (JAC). Number of offspring concerns monthly fecundity of a pair of snails. © 2018 Academia Sinica, Taiwan
Fig. 4 in High Fecundity, Rapid Development and Selfing Ability in Three Species of Viviparous Land Snails Phaedusinae (Gastropoda: Stylommatophora: Clausiliidae) from East Asia
Fig. 4. Reproductive activity of T. sheridani (SHE), T. tau (TAU), and S. jacobiana (JAC) under humid and dry conditions: (A, C, E) number of intrauterine eggs per dissected individual; (B, D, F) percentage of intrauterine embryos at various developmental stages. © 2018 Academia Sinica, Taiwan
Fig. 3 in High Fecundity, Rapid Development and Selfing Ability in Three Species of Viviparous Land Snails Phaedusinae (Gastropoda: Stylommatophora: Clausiliidae) from East Asia
Fig. 3. Stereophaedusa jacobiana. (A) adult (F1 generation); (B) neonates; (C) clausilium; (D) dissected adult with eggs; (E-F) egg and embryos from dissected adults. Scale bar = 1 mm.
Fig. 2 in High Fecundity, Rapid Development and Selfing Ability in Three Species of Viviparous Land Snails Phaedusinae (Gastropoda: Stylommatophora: Clausiliidae) from East Asia
Fig. 2. Tauphaedusa tau. (A) adult (F1 generation); (B) neonates; (C) clausilia; (D-E) eggs and embryos from dissected adults. Scale bar = 1 mm. © 2018 Academia Sinica, Taiwan
Se reproduire dans des climats changeants : déterminants et conséquences des modifications de la phénologie de la reproduction chez un reptile vivipare
<p><span>Les modifications des conditions thermiques diurnes et nocturnes induites par le changement climatique peuvent affecter les organismes par une perturbation des processus physiologiques, des traits fonctionnels, des stratégies de reproduction et des traits d'histoire de la vie. Les changements phénologiques constituent l’une des principales réponses au changement climatique chez de nombreux organismes et ont des conséquences majeures sur le succès reproductif des individus. Chez les ectothermes, les changements des dates de reproduction sont particulièrement marqués compte tenu des effets thermodynamiques sur les processus physiologiques et le cycle reproductif. Cette thèse vise à explorer les effets du climat et de la phénologie de la reproduction sur les traits physiologiques, comportementaux, reproductifs et les traits d’histoire de vie des femelles et de leur progéniture chez un ectotherme terrestre, le lézard vivipare (<em>Zootoca vivipara</em>). Nous avons utilisé une approche intégrative combinant des études transversales et longitudinales afin d’explorer les déterminants environnementaux, individuels et la sélection sur les dates de parturition en milieu naturel ainsi que des études expérimentales pour quantifier les bénéfices et les coûts de la plasticité thermique de la gestation en laboratoire. Les températures maximales journalières durant la période d’activité post-hivernale, la couverture forestière et la taille corporelle étaient des déterminants importants des dates de parturition. Nos résultats mettent en évidence une sélection directionnelle favorisant une date de parturition précoce, mais une faible capacité de réponse évolutive de ce trait à la sélection. Enfin, l’accélération thermique de la gestation induite par le réchauffement diurne et/ou nocturne altère l’homéostasie maternelle, mais une date de naissance plus précoce a des effets positifs sur la survie et la croissance de la progéniture. Dans l’ensemble, nos résultats suggèrent que l’étude des conséquences des changements phénologiques chez les squamates doit se concentrer sur les limites et la balance coût-bénéfice de la plasticité thermique des dates de reproduction. Nous soulignons également l’importance de considérer le réchauffement nocturne, les ajustements physiologiques et comportementaux pour y faire face, ainsi que l’importance de la structure de l’habitat pour comprendre et prédire les réponses des ectothermes terrestres face au changement climatique.</span></p>
Figure 1 in State of knowledge of viviparity in Staphylinidae and the evolutionary significance of this phenomenon in Corotoca Schiødte, 1853
Figure 1. Classification model for viviparous beetles.
Figure 5 in State of knowledge of viviparity in Staphylinidae and the evolutionary significance of this phenomenon in Corotoca Schiødte, 1853
Figure 5. Corotoca melantho SchiØdte, 1853, supposed second instar larva. Scale: 0.4 mm.
Data from: Low food availability during gestation enhances offspring post-natal growth, but reduces survival, in a viviparous lizard
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Data from: Experimental evidence of early costs of reproduction in conspecific viviparous and oviparous lizards
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Data from: Facultative oviparity in a viviparous skink (Saiphos equalis)
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Data from: Water availability and temperature induce changes in oxidative status during pregnancy in a viviparous lizard
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