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20 results for “Brachionus”
Data from: Genetic differentiation and phylogeographical structure of the Brachionus calyciflorus complex in eastern China
Spatio-temporal patterns and processes of genetic differentiation in passively dispersing zooplankton are drawing much attention from both ecologists and evolutionary biologists. Two opposite phylogeographical scenarios have already been demonstrated in rotifers, which consist of high levels of genetic differentiation among populations even on small geographical scales on the one hand, and the traditionally known cosmopolitanism that is associated with high levels of gene flow and long-distance dispersal via diapausing stages on the other hand. Here we analyzed the population genetic structure and the phylogeography of the Brachionus calyciflorus species complex in eastern China. By screening a total of 318 individuals from ten locations along a 2320 km gradient and analyzing samples from two growing seasons, we aimed at focusing on both small- and large-scale patterns. We identified eight cryptic species, and verified species status of two of these by sexual reproduction tests. Samples in summer and winter yielded different cryptic species. The distribution patterns of these genetically distinct cryptic species were diverse across eastern China, from full cosmopolitanism to local endemism. The two most abundant cryptic species BcWIII and BcSW both showed a pattern of strong genetic differentiation among populations and no significant isolation-by-distance. Long-distance colonization, secondary contact and recent range expansion are probably responsible for the indistinct pattern of isolation-by-distance. Our results suggest that geographical distance is more important than temporal segregation across seasons in explaining population differentiation and the occurrence of cryptic species. We explain the current phylogeographical structure in the B. calyciflorus species complex by a combination of recent population expansion, restricted gene flow, priority effects and long-distance colonization.
Fig. 3 in Phenotypic influences on the reproductive strategy of the facultative sexual rotifer Brachionus rubens (Monogononta)
Fig. 3 Percentage of sexual offspring as a function of their birth rank for three different treatments (food, temperature, and acclimation) and all combinations thereof. Bars in black represent significant deviations from the expected percentage of sexual offspring across a given treatment (continuous line) by falling outside the 95% confidence intervals of this value for that rank (dashed line; lower limit is zero if not visible)
Figure 1 in Diversity of the rotifer Brachionus plicatilis species complex (Rotifera: Monogononta) in Iran through integrative taxonomy
Figure 1. Nine linear measurements of the lorica of Brachionus rotifers used in this study, named from (a) to (i) as in Ciros-Pérez et al. (2001).
Figure 5 in Diversity of the rotifer Brachionus plicatilis species complex (Rotifera: Monogononta) in Iran through integrative taxonomy
Figure 5. Output of the K-means partitioning and choice of the best fit according to the Calinski criterion. The greyscale codes for the K-means partitioning indicate the identity of each individual (objects on the x-axis) in the groups from 2 to 9 on the y-axis. Individuals are numbered from 1 to 187 as in Appendix S2 (1 to 20 is Brachionus 'Austria', 21 to 61 is B03, 62 to 167 is Brachionus plicatilis s.s., and 168 to 187 is Brachionus 'Tiscar').The most likely value of the criterion is marked as a filled circle.
Data from: Morphological and taxonomic demarcation of Brachionus asplanchnoidis Charin within the Brachionus plicatilis cryptic species complex (Rotifera, Monogononta)
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Data from: Reverse taxonomy applied to the Brachionus calyciflorus cryptic species complex: morphometric analysis confirms species delimitations revealed by molecular phylogenetic analysis and allows the (re)description of four species
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Data from: Genetic differentiation and phylogeographical structure of the Brachionus calyciflorus complex in eastern China
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Data from: Genetic variability and transgenerational regulation of investment in sex in the monogonont rotifer Brachionus plicatilis
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Supplementary material 1 from: Guerrero-Jiménez G, Vannucchi PE, Silva-Briano M, Adabache-Ortiz A, Rico-Martínez R, Roberts D, Neilson R, Elías-Gutiérrez M (2019) Brachionus paranguensis sp. nov. (Rotifera, Monogononta), a member of the L group of the Brachionus plicatilis complex. ZooKeys 880: 1-23. https://doi.org/10.3897/zookeys.880.28992
Figures S1–S2
Figure 5 from: Guerrero-Jiménez G, Vannucchi PE, Silva-Briano M, Adabache-Ortiz A, Rico-Martínez R, Roberts D, Neilson R, Elías-Gutiérrez M (2019) Brachionus paranguensis sp. nov. (Rotifera, Monogononta), a member of the L group of the Brachionus plicatilis complex. ZooKeys 880: 1-23. https://doi.org/10.3897/zookeys.880.28992
Figure 5 Types of eggs in B. paranguensis sp. nov. SEM micrographs of the different types of eggs of B. paranguensis sp. nov. A resting egg from field samples and its special ornamentation and zoom of its membrane, see arrows (A.a, A.b) B parthenogenetic egg and C unfertilized sexual egg, both from cultured samples. Scale bars: 20 µm
Figure 6 from: Guerrero-Jiménez G, Vannucchi PE, Silva-Briano M, Adabache-Ortiz A, Rico-Martínez R, Roberts D, Neilson R, Elías-Gutiérrez M (2019) Brachionus paranguensis sp. nov. (Rotifera, Monogononta), a member of the L group of the Brachionus plicatilis complex. ZooKeys 880: 1-23. https://doi.org/10.3897/zookeys.880.28992
Figure 6 Trophi components of B. paranguensis sp. nov. SEM pictures of the trophi components of B. paranguensis sp. nov., collected in June 27, 2015 A ventral view B dorsal view C rami and fulcrum D manubrium E satellites F unco and sub uncus ar: articulation of manubrium, m: membrane; ma: manubrium with posterior claw, see arrow (D); mmc: manubrium middle crest, see arrow (D); rr: reinforced ridge; st: satellites, see arrow (E); su: sub uncus; u: uncus.: b: basifenestras, see arrow (C); f: fulcrum, see arrow (C); mc: manubrium cavities; ra: rami, and projections of the posterior portion of the rami, see arrow (C)). Scale bars: 10 µm.
Figure 4 from: Guerrero-Jiménez G, Vannucchi PE, Silva-Briano M, Adabache-Ortiz A, Rico-Martínez R, Roberts D, Neilson R, Elías-Gutiérrez M (2019) Brachionus paranguensis sp. nov. (Rotifera, Monogononta), a member of the L group of the Brachionus plicatilis complex. ZooKeys 880: 1-23. https://doi.org/10.3897/zookeys.880.28992
Figure 4 Taxonomic features of B. paranguensis sp. nov. A parthenogenetic female with lateral antennae (LA), gastric glands (gg), an U-shape sinus (us) B anterior dorsal and ventral spines taken by LM and SEMC lorica with an orange peel like surface D foot aperture E lateral antenna (see arrow) FSEM microphotographs of the female, ventral plate and G dorsal plate and H male. Scale bars: 50 µm (A, B, D, F, G, H), 10 µm (C, E). All females from sample collected in June 27, 2015. Males from cultures obtained from females collected in the volcanic maar Rincón de Parangueo.
Figure 3 from: Guerrero-Jiménez G, Vannucchi PE, Silva-Briano M, Adabache-Ortiz A, Rico-Martínez R, Roberts D, Neilson R, Elías-Gutiérrez M (2019) Brachionus paranguensis sp. nov. (Rotifera, Monogononta), a member of the L group of the Brachionus plicatilis complex. ZooKeys 880: 1-23. https://doi.org/10.3897/zookeys.880.28992
Figure 3 Map of the studied area. Sequence of pictures of the volcanic maar Rincón de Parangueo from 1993 to 2015, showing how the lake gradually desiccated. The arrow indicates the water pond where B. paranguensis sp. nov., was found (digital pictures downloaded from INEGI 2019).
Figure 2 from: Guerrero-Jiménez G, Vannucchi PE, Silva-Briano M, Adabache-Ortiz A, Rico-Martínez R, Roberts D, Neilson R, Elías-Gutiérrez M (2019) Brachionus paranguensis sp. nov. (Rotifera, Monogononta), a member of the L group of the Brachionus plicatilis complex. ZooKeys 880: 1-23. https://doi.org/10.3897/zookeys.880.28992
Figure 2 Comparison of COI and ITS1 LM trees focusing on the L4 group. COI and ITS1 Maximum Likelihood trees representing the four L groups of the Brachionus plicatilis complex and one outgroup species Brachionus rotundiformis. Focus is placed upon B. paranguensis sp. nov. L4 clade (grey shading) where details of the origin of each haplotype are given; all the other species are collapsed. Dotted lines between haplotypes indicate COI and ITS1 sequences that were sourced from the same individuals. Numbers at nodes represent support values (bootstrap = 1000). A list of references for each haplotype within the L4 group is provided.
Figure 1 from: Guerrero-Jiménez G, Vannucchi PE, Silva-Briano M, Adabache-Ortiz A, Rico-Martínez R, Roberts D, Neilson R, Elías-Gutiérrez M (2019) Brachionus paranguensis sp. nov. (Rotifera, Monogononta), a member of the L group of the Brachionus plicatilis complex. ZooKeys 880: 1-23. https://doi.org/10.3897/zookeys.880.28992
Figure 1 Different types of measurements. Dorsal view with the strokes of how anterior spines were measured according to AFu et al. (1991) and BCiros-Pérez et al. (2001).
Fig. 2 in Phenotypic influences on the reproductive strategy of the facultative sexual rotifer Brachionus rubens (Monogononta)
Fig. 2 Relationship between either the number of asexual offspring (a) or the production of at least one sexual offspring (b) with the lifetime reproduction for all females. The dashed line in a indicates total investment into asexual offspring. In b, the number of individuals with a given lifetime reproduction and producing either sexual (state 1) or asexual (state 0) offspring is represented by the diameter of the filled circle (see insert). Data in b were fitted ignoring the minor influence of food quality and temperature (see Results)
Figure 2 in Diversity of the rotifer Brachionus plicatilis species complex (Rotifera: Monogononta) in Iran through integrative taxonomy
Figure 2. Morphological diversity of the Iranian populations of Brachionus plicatilis. Lorica lengths are given in micrometres. Refer to Table 1 for abbreviations. L, large morphotype; S, small morphotype.
Figure 4 in Diversity of the rotifer Brachionus plicatilis species complex (Rotifera: Monogononta) in Iran through integrative taxonomy
Figure 4. Scatter plot of the measured individuals in the space defined by the first two discriminant axes. Names of the clonal lines refer to those of Table 1, but start with an additional capital letter, identifying the species according to DNA taxonomy (A, Brachionus 'Austria'; I, B03; P, Brachionus plicatilis s.s.; T, Brachionus 'Tiscar'). LD1, 2, Linear Discriminant axes.
Fig. 1 in Phenotypic influences on the reproductive strategy of the facultative sexual rotifer Brachionus rubens (Monogononta)
Fig. 1 Illustration of the experimental setup
Figure 3 in Diversity of the rotifer Brachionus plicatilis species complex (Rotifera: Monogononta) in Iran through integrative taxonomy
Figure 3. Frequency distribution of the rotifers based on their lorica length in micrometres.
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