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37 results for “Physa”
FIGURE 3 in Morphological diversification of alien and native aquatic snails of the genus Physa and Aplexa (Gastropoda: Physidae) of Western and Central European range
FIGURE 3. Scanning electron microscopy image of A. hypnorum shell (10.18150/UFOMHM) A, B—front (with visible lip) and back side of the shell, C—projecting lamellar crystals on the lip (Phot. A—C M. Gawlak).
FIGURE 2 in Morphological diversification of alien and native aquatic snails of the genus Physa and Aplexa (Gastropoda: Physidae) of Western and Central European range
FIGURE 2. Scanning electron micrographs of the shell apex of Physidae (10.18150/FIZSWX) Horizontally: A—P. acuta (subsidence ponds); B—A. hypnorum (anthropogenic ponds, Poland); C—P. fontinalis (Nida River, Poland); D—P. gyrina (Ireland, The Argory- ditch and Sandy Bay L Neagh; Wales, Gwent Levels in pond in flood plain (l. Killen); E- Apex of the small (young) specimens—1—P. acuta, 2—A. hyponorum, 3—P. fontinalis, 4—P. gyrina (Phot. A–E M. Gawlak).
FIGURE 1 in Morphological diversification of alien and native aquatic snails of the genus Physa and Aplexa (Gastropoda: Physidae) of Western and Central European range
FIGURE 1. Physidae of Western and Central Europe (10.18150/YPDFJU)—general shell morphology A—Physa acuta (Phot. M. Kanturski), B—Aplexa hypnorum, C—Physa fontinalis, D—Physa gyrina; 1—front side of the shell, 2—shell from the side view, 3—back side of the shell (Phot. B–D A. Cieplok, A. Spyra).
FIGURE 6. P in Morphological diversification of alien and native aquatic snails of the genus Physa and Aplexa (Gastropoda: Physidae) of Western and Central European range
FIGURE 6. P. acuta shell features (SEM) (10.18150/G6UWMN); in which the sutural belts are visible (A), the structure of a white lip (B) with characteristic projecting lamellar crystals (C) is indicated by an arrow (Phot. A–C M. Gawlak), (D) a view of the lip visible under the stereoscopic microscope (Phot. M. Kanturski).
FIGURE 8 in Morphological diversification of alien and native aquatic snails of the genus Physa and Aplexa (Gastropoda: Physidae) of Western and Central European range
FIGURE 8. Correspondence Analysis (CA) diagram for the Physidae species; 1—Whorl convexity, 2—Spire, 3—Shell thickness, 4—Thickened appendages, 5—Shell shine, 6—Shell width and height ratio, 7—Aperture height, 8—Shell height, 9—Lip, 10—Apex, 11—Shell width, 12—Aperture width, 13—Spire height.
Fig. 7 in Diversity and Distribution of Peritrich Ciliates on the Snail Physa acuta Draparnaud, 1805 (Gastropoda: Physidae) in a Eutrophic Lotic System
Fig. 7. Non-metric multidimensional scaling (NMDS) for peritrichs species abundance on Physa acuta shell. Stress = 0. C_pol = Carchesium polypinum, E_plic = Epistylis plicatilis, E_sp = Epistylis sp., O_art = Opercularia articulata, T_kel = Thuricola kellicottiana, V_cam = Vorticella campanula, V_sp = Vorticella sp.
Fig. 6 in Diversity and Distribution of Peritrich Ciliates on the Snail Physa acuta Draparnaud, 1805 (Gastropoda: Physidae) in a Eutrophic Lotic System
Fig. 6. Abundance, density, diversity and dominance of peritrich epibionts on sites of the Physa acuta shell. Different letters indicate statistical differences p <0.05 and the symbol *indicate p> 0.05.
Fig. 5 in Diversity and Distribution of Peritrich Ciliates on the Snail Physa acuta Draparnaud, 1805 (Gastropoda: Physidae) in a Eutrophic Lotic System
Fig. 5. Abundance and density of peritrich ciliates on the sites of the Physa acuta shell. Distribution of the total number of epibionts throughout the antero-posterior axis of the shell. © 2018 Academia Sinica, Taiwan
Fig. 4 in Diversity and Distribution of Peritrich Ciliates on the Snail Physa acuta Draparnaud, 1805 (Gastropoda: Physidae) in a Eutrophic Lotic System
Fig. 4. Abundance and density of peritrich species on the surface on the Physa acuta shell. Different letters indicate statistical differences (p <0.05) and * indicates species present exclusively on the dorsal surface.
Fig. 2 in Diversity and Distribution of Peritrich Ciliates on the Snail Physa acuta Draparnaud, 1805 (Gastropoda: Physidae) in a Eutrophic Lotic System
Fig. 2. Schematic representation of the distribution of peritrichs ciliates species on the Physa acuta shell. © 2018 Academia Sinica, Taiwan
Fig. 1 in Diversity and Distribution of Peritrich Ciliates on the Snail Physa acuta Draparnaud, 1805 (Gastropoda: Physidae) in a Eutrophic Lotic System
Fig. 1. in vivo photomicrographics of peritrich ciliates species on Physa acuta. (A-C) Peritrich ciliates attached to the shell. (D) Epistylis sp. (E) Opercularia articulata. (F) Carchesium polypinum. (G) Vorticella sp. (H) Vorticella campanula. (I) Epistylis plicatilis. (J) Thuricola kellicottiana. Scale bars: A = 0.15 cm; B = 1.5 mm; C = 0.5 mm; D-L = 25 µm.
Data and R code for: Tariel J., Plénet S., and Luquet É. (2020). How do developmental and parental exposures to predation affect personality and immediate behavioural plasticity in the snail Physa acuta?
<p>Data and R code of the article: Tariel J., Plénet S., and Luquet É. (2020) How do developmental and parental exposures to predation affect personality and immediate behavioural plasticity in the snail <em>Physa acuta</em>? doi:<a href="http://doi.org/10.1098/rspb.2020.1761">10.1098/rspb.2020.1761</a></p> <p>The dataset is provided (<em>data -Tariel, Plénet and Luquet (2020).csv</em>). This dataset is analyzed in the R script (<em>Juliette Tariel - R analysis.Rmd</em>). A knitted version of the R script is also provided in pdf format (<em>Juliette Tariel - R analysis.pdf</em>). Finally, a zip file is provided and contains several outputs, such as MCMCglmm objects or confint objects (<em>R outputs used in the analysis.zip</em>)</p> <p><strong>Signification of variables names:</strong></p> <ul> <li>ID: snail's identification number</li> <li>ID Family: identification number of the family of the F2 snail</li> <li>ID F1 mother: identification number of the mother of the F2 snail</li> <li>ID F1 father: identification number of the father of the F2 snail</li> <li>ID F0 grand-mother: identification number of the grand-mother of the F2 snail</li> <li>ID F0 grand-father: identification number of the grand-fathrt of the F2 snail</li> <li>Mass: total wet mass (body and shell) in grams</li> <li>Parental: parental environment (control C or predator-cue P)</li> <li>Developmental: developmental environment (C or P)</li> <li>Immediate: immediate environment (C or P)</li> <li>Trial_number</li> <li>Time: time to crawl-out of the water in seconds</li> </ul>
Data from: Why get big in the cold? Size-fecundity relationships explain the temperature-size rule in a pulmonate snail (Physa)
Most ectotherms follow a pattern of size plasticity known as the temperature-size rule where individuals reared in cold environments are larger at maturation than those reared in warm environments. This pattern seems maladaptive because growth is slower in the cold so it takes longer to reach a large size. However, it may be adaptive if reaching a large size has a greater benefit in a cold than in a warm environment such as when size-dependent mortality or size-dependent fecundity depends on temperature. I present a theoretical model showing how a correlation between temperature and the size–fecundity relationship affects optimal size at maturation. I parameterize the model using data from a freshwater pulmonate snail from the genus Physa. Nine families were reared from hatching in one of three temperature regimes (daytime temperature of 22, 25 or 28 °C, night-time temperature of 22 °C, under a 12L : 12D light cycle). Eight of the nine families followed the temperature-size rule indicating genetic variation for this plasticity. As predicted, the size–fecundity relationship depended upon temperature; fecundity increases steeply with size in the coldest treatment, less steeply in the intermediate treatment, and shows no relationship with size in the warmest treatment. Thus, following the temperature-size rule is adaptive for this species. Although rarely measured under multiple conditions, size–fecundity relationships seem to be sensitive to a number of environmental conditions in addition to temperature including local productivity, competition and predation. If this form of plasticity is as widespread as it appears to be, this model shows that such plasticity has the potential to greatly modify current life-history theory.
FIGURE 5 in Morphological diversification of alien and native aquatic snails of the genus Physa and Aplexa (Gastropoda: Physidae) of Western and Central European range
FIGURE 5. SEM micrograph of a P. fontinalis shell (10.18150/HIMKRE) (A–C) (Phot. M. Gawlak).
Effects of salinity and acetaminophen on Physa acuta
<p>Raw data for length, movement, and total number of eggs after 14 days exposure</p>
Fig. 1 in Haplotype variation in the Physa acuta group (Basommatophora): genetic diversity and distribution in Serbia Abstract
Fig. 1: Distribution of P. acuta group in Canada, North America, Mexico and Cuba (A), Europe (B) and Serbia (C). Distribution of P. acuta in North and Central America (white circles) was compiled from the data of Wethington et al. (2009), Wethington & Guralnick (2004) and Kraus et al. (2014). The European (white circles) range is based on Wethington & Lydeard (2007), data and distribution in Serbia is based on Novaković (2014, black circles), and on our field sampling data (white circles).
Data from: Why get big in the cold? Size-fecundity relationships explain the temperature-size rule in a pulmonate snail (Physa)
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