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33 results for “Ircinia”
FIGURE 4 in A new Setacheres (Copepoda, Siphonostomatoida, Asterocheridae) associated with Ircinia felix (Duchassaing & Michelotti) (Porifera) from Brazil
FIGURE 4. Setacheres portobarrensis sp. nov. female (paratype: UFBA 3183). a, leg 1; b, leg 2; c, leg 3; d, leg 4; e, leg 5. Scale bars: a–d = 50 µm; e = 40 µm.
FIGURE 3 in A new Setacheres (Copepoda, Siphonostomatoida, Asterocheridae) associated with Ircinia felix (Duchassaing & Michelotti) (Porifera) from Brazil
FIGURE 3. Setacheres portobarrensis sp. nov. female (paratype: UFBA 3183). a, antenna, arrows indicating spine-like setae close to distal claw on third endopodal segment; b, mandible, arrow indicating mandibular stylet with subterminal serrated portion and triangular distal end; c, maxillule, arrow indicating very thick, claw-like bristle on outer lobe; d, maxilla; e, maxilliped. Scale bars: a–e = 50 µm.
FIGURE 2 in A new Setacheres (Copepoda, Siphonostomatoida, Asterocheridae) associated with Ircinia felix (Duchassaing & Michelotti) (Porifera) from Brazil
FIGURE 2. Setacheres portobarrensis sp. nov. female (paratype: UFBA 3183). a, body, dorsal view; b, rostrum; c, urosome; d, antennule. Scale bars: a = 125 µm; b = 50 µm; c = 70 µm; d = 50 µm.
Oceanographic features and limited dispersal shape the population genetic structure of the vase sponge Ircinia campana in the Greater Caribbean
<p>Understanding population genetic structure can help us to infer dispersal patterns, predict population resilience and design effective management strategies. For sessile species with limited dispersal, this is especially pertinent because genetic diversity and connectivity are key aspects of their resilience to environmental stressors. Here, we describe the population structure of <i>Ircinia campana</i>, a common Caribbean sponge subject to mass mortalities and disease. Microsatellites were used to genotype 440 individuals from 19 sites throughout the Greater Caribbean. We found strong genetic structure across the region, and significant isolation by distance across the Lesser Antilles, highlighting the influence of limited larval dispersal. We also observed spatial genetic structure patterns congruent with oceanography. This includes evidence of connectivity between sponges in the Florida Keys and the southeast coast of the United States (>700 km away) where the oceanographic environment is dominated by the strong Florida Current. Conversely, the population in southern Belize was strongly differentiated from all other sites, consistent with the presence of dispersal-limiting oceanographic features, including the Gulf of Honduras gyre. At smaller spatial scales (<100 km), sites showed heterogeneous patterns of low-level but significant genetic differentiation (chaotic genetic patchiness), indicative of temporal variability in recruitment or local selective pressures. Genetic diversity was similar across sites, but there was evidence of a genetic bottleneck at one site in Florida where past mass mortalities have occurred. These findings underscore the relationship between regional oceanography and weak larval dispersal in explaining population genetic patterns, and could inform conservation management of the species.</p>
Oceanographic features and limited dispersal shape the population genetic structure of the vase sponge Ircinia campana in the Greater Caribbean
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FIGURE 1 in A new Setacheres (Copepoda, Siphonostomatoida, Asterocheridae) associated with Ircinia felix (Duchassaing & Michelotti) (Porifera) from Brazil
FIGURE 1. Sampling site in Porto da Barra Beach, Todos-os-Santos Bay, Salvador City, Bahia, Brazil.
Fig. 11. Ircinia mureungensis n in Nine new species of genus Ircinia (Demospongiae: Dictyoceratida: Irciniidae) from Korea
Fig. 11. Ircinia mureungensis n. sp. A, entire animal; B, closed surface; C, skeletal structure near surface; D, closed primary fibres and secondary web; E, subdermal skeletal structure; F, secondary fibres between cored primary fibres; G, choanosome skeletal structure; H, branched secondary fibres. Scale bars: A = 6 cm, B = 10 cm, C = 200 μm, D-H = 100 μm.
Fig. 12. Ircinia bergquistia n in Nine new species of genus Ircinia (Demospongiae: Dictyoceratida: Irciniidae) from Korea
Fig. 12. Ircinia bergquistia n. sp. A, entire animal; B, closed surface; C, surface conules and membrane with spicules; D, E, skeletal structure near surface; F, branched secondary fibres; G, primary and secondary fibres; H, branched secondary fibres. Scale bars: A = 2 cm, B = 10 cm, CH = 100 μm.
Fig. 9. Ircinia jejuensis n in Nine new species of genus Ircinia (Demospongiae: Dictyoceratida: Irciniidae) from Korea
Fig. 9. Ircinia jejuensis n. sp. A, entire animal; B, closed surface; C, skeletal structure in conule; D, secondary web between primary fibres cored with spicules; E, uncored primary fibres and secondary fibres; F, perforated secondary fibres. Scale bars: A = 4 cm, B = 12 cm, C = 200 μm, D-F = 100 μm.
Fig. 7. Ircinia munsumensis n in Nine new species of genus Ircinia (Demospongiae: Dictyoceratida: Irciniidae) from Korea
Fig. 7. Ircinia munsumensis n. sp. A, entire animal; B, closed surface; C, skeletal structure near surface; D, secondary web between cored primary fibres; E, choanosome skeletal structure; F, choanosome thick secondary fibres. Scale bars: A = 2 cm, B = 10 cm, C = 200 μm, DF = 100 μm.
FIGURE 13 in New shallow water species of Caribbean Ircinia Nardo, 1833 (Porifera: Irciniidae)
FIGURE 13. Histological sections of Ircinia ruetzleri sp. nov. USNM 1642001 (holotype). Abbreviations follow Figure 3. Cn denotes conule. A: Image showing sediment and spicules included in the mesohyl. A representative band of irciniid filaments is highlighted. B: Examples of sediment coring in a delta-like formation of secondary fibers. At the left of the image, a primary fiber terminates at the tip of a conule.
FIGURE 7. A, B in New shallow water species of Caribbean Ircinia Nardo, 1833 (Porifera: Irciniidae)
FIGURE 7. A, B: Histological sections of Ircinia radix sp. nov., specimen voucher USNM 1582258 (holotype). Abbreviations follow Figure 3.
FIGURE 1 in New shallow water species of Caribbean Ircinia Nardo, 1833 (Porifera: Irciniidae)
FIGURE 1. Maps of sampling locations. A: Overview of three sites; B: Bocas del Toro, Panama; C: Mesoamerican Barrier Reef, Belize; D: Summerland Key, United States of America. Open circles in A denote the location of field sites. In B-D, filled circles are coral reefs or coral patch reefs, squares are seagrass beds, and triangles are mangroves.
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