FIGURES 2–8. Osmundea sanctarum: vegetative morphology. Fig. 2. Representative plant. Holotype (S... more FIGURES 2–8. Osmundea sanctarum: vegetative morphology. Fig. 2. Representative plant. Holotype (SP! 427820) (5 mm). Fig. 3. Detail of a branch with secondary small holdfast (arrow) (2 mm). Fig. 4. Transverse section of the upper portion of a branch (100 µm). Fig. 5. Transverse section showing two axial cells (a), each of which has two pericentral cells (p) and a basal trichoblast cell (bt) (50 µm). Fig. 6. Transverse section of main axes (100 µm). Fig. 7. Detail of transverse section of a branch showing external cortical layer with translucent cells (25 µm). Fig. 8. Translucent cortical cells in surface view (arrows) (25 µm).
FIGURE 1. Southern coast of São Paulo State, showing the Laje de Santos Marine State Park, includ... more FIGURE 1. Southern coast of São Paulo State, showing the Laje de Santos Marine State Park, including bathymetric lines (20 m depth), Laje de Santos, Calhaus and four reefs (Brilhante, Bandolim, Sul and Novo). The arrows show the collection sites.
FIGURE 13. Bayesian phylogram inferred from analyses of rbcL sequences for 35 Laurencia complex t... more FIGURE 13. Bayesian phylogram inferred from analyses of rbcL sequences for 35 Laurencia complex taxa and two outgroup species. Numbers above branches correspond to support values for Bayesian inference posterior probability/maximum likelihood bootstrap/ and maximum parsimony bootstrap, respectively. Bold lines indicate a fully supported node in all three analyses. Taxa marked in bold indicate newly determined sequences.
Laurencia marilzae is recorded for the first time from the western Atlantic Ocean; it was found i... more Laurencia marilzae is recorded for the first time from the western Atlantic Ocean; it was found in Laje de Santos Marine State Park, São Paulo, southeastern Brazil. The specimens were collected in the rocky subtidal zone from 7 to 15 m depth. The most distinctive characteristic of this species is the presence of corps en cerise in all cells of the thallus, including cortex, medulla, and trichoblasts. The phylogenetic position of the species was inferred by analysis of the chloroplast-encoded rbcL gene sequences from 43 taxa, using two other rhodomelacean taxa and two members of the Ceramiaceae as outgroups. Within the Laurencia assemblage, L. marilzae from Brazil and from the Canary Islands (type locality) formed a distinctive lineage sister to all other Laurencia species analyzed. Male plants are described for the first time. This study expands the geographical distribution of L. marilzae to the western Atlantic Ocean.
The Trindade and Martin Vaz island group (TMVIG) is located at about 1,120 km off the Brazilian c... more The Trindade and Martin Vaz island group (TMVIG) is located at about 1,120 km off the Brazilian coast. Despite its importance, highlighted by the presence of several endemic fish species, the TMVIG lacks detailed information on the structure of fish and benthic assemblages. Presented here is the first quantitative assessment of reef fish and benthic assemblages of the TMVIG in a depth gradient ranging from 5 to 45 m. Additional qualitative information on reef assemblages between 45 and 100 m was obtained using advanced gas diving techniques (TRIMIX) and a remotely operated vehicle (ROV). Similarly to other Brazilian oceanic islands, the TMVIG possesses depauperated fish and benthic assemblages, possibly due to its isolation and small size in comparison to the mainland. Depth was the most important factor affecting the structure of fish assemblages, with the density of most fish species declining with depth. Deep reefs (> 45 m) were characterized by the presence of extensive rhodo...
FIGURES 2–8. Osmundea sanctarum: vegetative morphology. Fig. 2. Representative plant. Holotype (S... more FIGURES 2–8. Osmundea sanctarum: vegetative morphology. Fig. 2. Representative plant. Holotype (SP! 427820) (5 mm). Fig. 3. Detail of a branch with secondary small holdfast (arrow) (2 mm). Fig. 4. Transverse section of the upper portion of a branch (100 µm). Fig. 5. Transverse section showing two axial cells (a), each of which has two pericentral cells (p) and a basal trichoblast cell (bt) (50 µm). Fig. 6. Transverse section of main axes (100 µm). Fig. 7. Detail of transverse section of a branch showing external cortical layer with translucent cells (25 µm). Fig. 8. Translucent cortical cells in surface view (arrows) (25 µm).
FIGURE 1. Southern coast of São Paulo State, showing the Laje de Santos Marine State Park, includ... more FIGURE 1. Southern coast of São Paulo State, showing the Laje de Santos Marine State Park, including bathymetric lines (20 m depth), Laje de Santos, Calhaus and four reefs (Brilhante, Bandolim, Sul and Novo). The arrows show the collection sites.
FIGURE 13. Bayesian phylogram inferred from analyses of rbcL sequences for 35 Laurencia complex t... more FIGURE 13. Bayesian phylogram inferred from analyses of rbcL sequences for 35 Laurencia complex taxa and two outgroup species. Numbers above branches correspond to support values for Bayesian inference posterior probability/maximum likelihood bootstrap/ and maximum parsimony bootstrap, respectively. Bold lines indicate a fully supported node in all three analyses. Taxa marked in bold indicate newly determined sequences.
Laurencia marilzae is recorded for the first time from the western Atlantic Ocean; it was found i... more Laurencia marilzae is recorded for the first time from the western Atlantic Ocean; it was found in Laje de Santos Marine State Park, São Paulo, southeastern Brazil. The specimens were collected in the rocky subtidal zone from 7 to 15 m depth. The most distinctive characteristic of this species is the presence of corps en cerise in all cells of the thallus, including cortex, medulla, and trichoblasts. The phylogenetic position of the species was inferred by analysis of the chloroplast-encoded rbcL gene sequences from 43 taxa, using two other rhodomelacean taxa and two members of the Ceramiaceae as outgroups. Within the Laurencia assemblage, L. marilzae from Brazil and from the Canary Islands (type locality) formed a distinctive lineage sister to all other Laurencia species analyzed. Male plants are described for the first time. This study expands the geographical distribution of L. marilzae to the western Atlantic Ocean.
The Trindade and Martin Vaz island group (TMVIG) is located at about 1,120 km off the Brazilian c... more The Trindade and Martin Vaz island group (TMVIG) is located at about 1,120 km off the Brazilian coast. Despite its importance, highlighted by the presence of several endemic fish species, the TMVIG lacks detailed information on the structure of fish and benthic assemblages. Presented here is the first quantitative assessment of reef fish and benthic assemblages of the TMVIG in a depth gradient ranging from 5 to 45 m. Additional qualitative information on reef assemblages between 45 and 100 m was obtained using advanced gas diving techniques (TRIMIX) and a remotely operated vehicle (ROV). Similarly to other Brazilian oceanic islands, the TMVIG possesses depauperated fish and benthic assemblages, possibly due to its isolation and small size in comparison to the mainland. Depth was the most important factor affecting the structure of fish assemblages, with the density of most fish species declining with depth. Deep reefs (> 45 m) were characterized by the presence of extensive rhodo...
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