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5 results for “Callogorgia”
Data from: Niche divergence by deep-sea octocorals in the genus Callogorgia across the continental slope of the Gulf of Mexico
Environmental variables that are correlated with depth have been suggested to be among the major forces underlying speciation in the deep sea. This study incorporated phylogenetics and ecological niche models (ENM) to examine whether congeneric species of Callogorgia (Octocorallia: Primnoidae) occupy different ecological niches across the continental slope of the Gulf of Mexico (GoM), and whether this niche divergence could be important in the evolution of these closely related species. Callogorgia americana americana, C. americana delta, and C. gracilis were documented at 13 sites in the GoM (250-1000 m) from specimen collections and extensive video observations. On a first order, these species were separated by depth, with C. gracilis occurring at the shallowest sites, C. a. americana at mid-depths, and C. a. delta at the deepest sites. Callogorgia a. delta was associated with areas of increased seep activity whereas C. gracilis and C. a. americana were associated with narrow, yet warmer, temperature ranges and did not occur near cold seeps. ENM background and identity tests revealed little to no overlap in ecological niches between species. Temporal calibration of the phylogeny revealed the formation of the Isthmus of Panama was a vicariance event that may explain some of the patterns of speciation within this genus. These results elucidate the potential mechanisms for speciation in the deep sea, emphasizing both bathymetric speciation and vicariance events in the evolution of a genus across multiple regions.
FIGURE 1 in Callogorgia lucaya sp. nov., a new species of deep-sea Primnoidae (Anthozoa: Octocorallia) from the western Atlantic
FIGURE 1. COlOny anD Details Of Callogorgia lucaya sp. nov. (USNM 50193, HOlOtype). A: brancH sHOWing fOur WHOrls Of pOlyps; B: entire specimen sHOWing alternate pinnate brancHing; C: stereO vieW Of a WHOrl Of pOlyps.
FIGURE 2 in Callogorgia lucaya sp. nov., a new species of deep-sea Primnoidae (Anthozoa: Octocorallia) from the western Atlantic
FIGURE 2. Sclerites Of Callogorgia lucaya sp. nov. (USNM 50193, HOlOtype). A: Opercular scales; A1: abaxials; A2: Outer laterals; A3: inner lateral; A4: aDaxial; B: bODy Wall scales; C: cOenencHymal scales. All scales but tHOse markeD WitH * are in Outer face vieW.
FIGURE 3 in Callogorgia lucaya sp. nov., a new species of deep-sea Primnoidae (Anthozoa: Octocorallia) from the western Atlantic
FIGURE 3. BrancH-tip anD pOlyp vieW Of Callogorgia lucaya sp. nov. A: BrancH anD WHOrls; B,D: stereO vieW Of tHe abaxial siDe (USNM 52927 anD USNM 58424, respectively); C: stereO vieW Of tHe aDaxial siDe (USNM 52942). Abax: abaxial scales; IL: inner-lateral scales; OL: Outer-lateral scales.
Data from: Niche divergence by deep-sea octocorals in the genus Callogorgia across the continental slope of the Gulf of Mexico
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