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Alopias
The Experts below are selected from a list of 879 Experts worldwide ranked by ideXlab platform
Jacob Geleijns – One of the best experts on this subject based on the ideXlab platform.
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3D reconstruction of the left lower jaw of Alopias superciliosus (UF 160188)
, 2017Co-Authors: Martin Brazeau, Pepijn Kamminga, Paul W. De Bruin, Jacob GeleijnsAbstract:3D reconstruction of the left lower jaw of Alopias superciliosus (UF 160188
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3D reconstruction of the left lower jaw of Alopias vulpinus (ZMA.PISC.111198)
, 2017Co-Authors: Martin Brazeau, Pepijn Kamminga, Paul W. De Bruin, Jacob GeleijnsAbstract:3D reconstruction of the left lower jaw of Alopias vulpinus (ZMA.PISC.111198
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3D reconstruction of the left lower jaw of Alopias vulpinus (ZMA.PISC.116876)
, 2017Co-Authors: Martin Brazeau, Pepijn Kamminga, Paul W. De Bruin, Jacob GeleijnsAbstract:3D reconstruction of the left lower jaw of Alopias vulpinus (ZMA.PISC.116876
Nicholas C Wegner – One of the best experts on this subject based on the ideXlab platform.
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gill morphometrics of the thresher sharks genus Alopias correlation of gill dimensions with aerobic demand and environmental oxygen
Journal of Morphology, 2015Co-Authors: Thomas P Wootton, Nicholas C Wegner, Chugey A SepulvedaAbstract:Gill morphometrics of the three thresher shark species (genus Alopias) were determined to examine how metabolism and habitat correlate with respiratory specialization for increased gas exchange. Thresher sharks have large gill surface areas, short water-blood barrier distances, and thin lamellae. Their large gill areas are derived from long total filament lengths and large lamellae, a morphometric configuration documented for other active elasmobranchs (i.e., lamnid sharks, Lamnidae) that augments respiratory surface area while limiting increases in branchial resistance to ventilatory flow. The bigeye thresher, Alopias superciliosus, which can experience prolonged exposure to hypoxia during diel vertical migrations, has the largest gill surface area documented for any elasmobranch species studied to date. The pelagic thresher shark, A. pelagicus, a warm-water epi-pelagic species, has a gill surface area comparable to that of the common thresher shark, A. vulpinus, despite the latter’s expected higher aerobic requirements associated with regional endothermy. In addition, A. vulpinus has a significantly longer water-blood barrier distance than A. pelagicus and A. superciliosus, which likely reflects its cold, well-oxygenated habitat relative to the two other Alopias species. In fast-swimming fishes (such as A. vulpinus and A. pelagicus) cranial streamlining may impose morphological constraints on gill size. However, such constraints may be relaxed in hypoxia-dwelling species (such as A. superciliosus) that are likely less dependent on streamlining and can therefore accommodate larger branchial chambers and gills.
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The red muscle morphology of the thresher sharks (family Alopiidae).
Journal of Experimental Biology, 2005Co-Authors: C. A. Sepulveda, Nicholas C Wegner, Diego Bernal, Jeffrey B. GrahamAbstract:SUMMARY A more medial and anterior position of the red aerobic myotomal muscle (RM)
and the presence of a vascular counter-current heat exchange system provide
the functional elements that facilitate regional RM endothermy in tunas,
lamnid sharks and the common thresher shark ( Alopias vulpinus ). The
convergent RM morphology among all species capable of RM endothermy suggests
that RM position is a strong predictor of fish endothermic capacity. The
present study investigated the comparative RM morphology of the other two
thresher shark species (bigeye thresher, Alopias superciliosus , and
the pelagic thresher, Alopias pelagicus ), for which there is no
information regarding their capacity for RM endothermy, and compared these
data with published works on A. vulpinus . The digitization of
transverse sections along the body of A. superciliosus and A.
pelagicus enabled quantification of the relative amount of RM and the
position and placement of the RM along the body. The RM in both A.
superciliosus and A. pelagicus is positioned subcutaneously,
along the lateral edges of the myotomes, and is distributed relatively evenly
over the trunk of the body. The position of maximum RM area is at 50% fork
length ( FL ) for A. superciliosus and at 75% FL for
A. pelagicus . The amount of RM (mean ± s.e.m.) is
2.31±0.11% and 3.01±0.10% in A. superciliosus and
A. pelagicus , respectively. When compared with A. vulpinus ,
all three alopiid sharks have a similar amount of RM. However, A.
superciliosus and A. pelagicus differ from A. vulpinus
in that they do not possess the medial and anterior RM arrangement that would
likely facilitate metabolic heat conservation (RM endothermy).
Martin Brazeau – One of the best experts on this subject based on the ideXlab platform.
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3D reconstruction of the left lower jaw of Alopias superciliosus (UF 160188)
, 2017Co-Authors: Martin Brazeau, Pepijn Kamminga, Paul W. De Bruin, Jacob GeleijnsAbstract:3D reconstruction of the left lower jaw of Alopias superciliosus (UF 160188
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3D reconstruction of the left lower jaw of Alopias vulpinus (ZMA.PISC.111198)
, 2017Co-Authors: Martin Brazeau, Pepijn Kamminga, Paul W. De Bruin, Jacob GeleijnsAbstract:3D reconstruction of the left lower jaw of Alopias vulpinus (ZMA.PISC.111198
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3D reconstruction of the left lower jaw of Alopias vulpinus (ZMA.PISC.116876)
, 2017Co-Authors: Martin Brazeau, Pepijn Kamminga, Paul W. De Bruin, Jacob GeleijnsAbstract:3D reconstruction of the left lower jaw of Alopias vulpinus (ZMA.PISC.116876