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7 results for “Boeckella”
Figs 23-32 in Description of the postembryonic stages of Boeckella poopoensis (Crustacea, Copepoda, Centropagidae)
Figs 23-32. Abdomen, furcal setae and V pair of legs of Boeckella poopoensis copepodite stages. 23 to 25, furcal setae of copepodite I-III; 26, abdomen and furcal setae of copepodite IV; 27, V pair of legs of copepodite IV ♀; 28, V pair of legs of copepodite IV ♂; 29, abdomen and furcal setae of copepodite V ♀; 30, abdomen and furcal setae of copepodite V ♂; 31, V pair of legs of copepodite V ♀; 32, V pair of legs of copepodite V ♂ (ab, last abdominal segment; fb, furcal branch; cX, coXopod; bp, basipod; en, endopod; eX, eXopod).
Figs 1-22 in Description of the postembryonic stages of Boeckella poopoensis (Crustacea, Copepoda, Centropagidae)
Figs 1-22. Appendages of Boeckella poopoensis naupliar stages. 1, 4, 7, 10, 14 and 18, antennula of nauplius I-VI; 2, 5, 8, 11, 15 and 19, antenna of nauplius I-VI; 3, 6, 9, 12, 16 and 20, mandible of nauplius I-VI; 13, 17 and 21: maXillule of nauplius IV-VI; 22, maXilla of nauplius VI (s1, segment 1; s2, segment 2; s3, segment 3; cX, coXopod; bp, basipod; en, endopod; eX, eXopod; ilb, internal lobe; elb, eXternal lobe).
Diversification patterns in Boeckella
<p><b>Aim</b>: We investigated evolutionary relationships and biogeographical patterns within the genus <i>Boeckella</i> to evaluate: 1) whether its current widespread distribution in the Southern Hemisphere is due to recent long-distance dispersal or long-term diversification; and 2) the age and origin of sub-Antarctic and Antarctic <i>Boeckella</i> species, with particular focus on the most widely distributed species: <i>B. poppei.</i></p> <p><b>Location</b>: South America, sub-Antarctic islands, maritime Antarctica, continental Antarctica and Australasia.</p> <p><b>Methods</b>: To reconstruct phylogenetic patterns of <i>Boeckella</i>, we used molecular sequence data collected from 12 regions, and applied Bayesian and Maximum Likelihood analyses using multiple loci. We also estimated divergence times and reconstructed ancestral ranges using two different models of species evolution.</p> <p><b>Results</b>: Phylogenetic analyses and divergence time estimates suggested that <i>Boeckella</i> originated on the Gondwanan supercontinent and initially split into two main clades during the late Cretaceous (ca. 80 Ma). The first clade diversified in Australasia and the second clade is currently distributed in South America, various sub-Antarctic islands and Antarctica. Dispersal from South America to the Kerguelen and Crozet archipelagos occurred during the Eocene/Oligocene (B. vallentini) and in the late Pliocene (<i>B. brevicaudata</i>), while South Georgia and the maritime Antarctic were likely colonized during the late Pleistocene (<i>B. poppei</i>).</p> <p><b>Main conclusions</b>: Boeckella has a Gondwanan origin, with further diversifications after the physical separation of the continental landmasses. Extant populations of <i>Boeckella </i>from the Scotia Arc islands and Antarctic Peninsula originated from South America during the Pleistocene, suggesting that original Antarctic Gondwanan lineages did not survive repeated glacial cycles during the Quaternary ice ages. A continuous decline in the species accumulation rate is apparent within the genus since the early Eocene, suggesting that <i>Boeckella </i>diversification may have decreased due to progressive cooling throughout the Cenozoic era.</p>
Diversification patterns in Boeckella
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Supplementary material 1 from: Maturana CS, Rosenfeld S, Naretto J, Convey P, Poulin E (2019) Distribution of the genus Boeckella (Crustacea, Copepoda, Calanoida, Centropagidae) at high latitudes in South America and the main Antarctic biogeographic regions. ZooKeys 854: 1-15. https://doi.org/10.3897/zookeys.854.29614
: Data type: ocurrence dataset
Figure 2 from: Maturana CS, Rosenfeld S, Naretto J, Convey P, Poulin E (2019) Distribution of the genus Boeckella (Crustacea, Copepoda, Calanoida, Centropagidae) at high latitudes in South America and the main Antarctic biogeographic regions. ZooKeys 854: 1-15. https://doi.org/10.3897/zookeys.854.29614
Figure 2 Map of the sampling locations in South America, sub- and maritime Antarctica. Six species were identified following the traditional taxonomic key (Bayly 1992a). Boeckellapoppei is present across the three Antarctic biogeographic regions. Drawings of the fifth male leg are modifications from Bayly (1992a).
Figure 1 from: Maturana CS, Rosenfeld S, Naretto J, Convey P, Poulin E (2019) Distribution of the genus Boeckella (Crustacea, Copepoda, Calanoida, Centropagidae) at high latitudes in South America and the main Antarctic biogeographic regions. ZooKeys 854: 1-15. https://doi.org/10.3897/zookeys.854.29614
Figure 1 Spatial distribution of 14 Boeckella species from the targeted study area. The western (left side) and eastern (right side) of southern South America (green/blue: subpolar forest; brown: grassland), sub-Antarctic islands (light blue) and maritime Antarctic regions (light grey) obtained from records (red: obtained from field sampling; blue: obtained from literature and GBIF database) of all combined data sources. *: discrete outlier records; dash bars: distribution extended north of 40°S; dashed lines: geographic discontinuity. Records from East Antarctic were not included.
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