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13 results for “Prionace glauca”
Figure 2 in PhD Thesis Summary: Biologie, écologie et conservation du requin peau bleue (Prionace glauca) et du requin mako (Isurus oxyrinchus) en Atlantique nord-est
Figure 2. – Mercury level (mg kg-1 fresh meat) and body mass index (BMI, kg/cm2) in blue shark (u, N = 37) and shortfin mako (l, N = 46). Dotted line section of the curve represents the extrapolation from regression analysis for blue sharks.
Figure 4 in PhD Thesis Summary: Biologie, écologie et conservation du requin peau bleue (Prionace glauca) et du requin mako (Isurus oxyrinchus) en Atlantique nord-est
Figure 4. – Observed mercury level (Hg) (u, l) and estimated values (s) using body mass index (BMI, kg/cm2) as a function of mass (TL, cm). A: Blue shark (N = 37); B: Shortfin mako (N = 46).
Figure 1. – A in PhD Thesis Summary: Biologie, écologie et conservation du requin peau bleue (Prionace glauca) et du requin mako (Isurus oxyrinchus) en Atlantique nord-est
Figure 1. – A: Body mass index (BMI, kg/cm2) and size (TL, cm) in blue shark (N = 37) and shortfin mako (N = 46). B: Body mass index (BMI, kg/cm2) and total mass (W, kg) in blue shark (N = 37) and shortfin mako (N = 46).
Figure 3 in PhD Thesis Summary: Biologie, écologie et conservation du requin peau bleue (Prionace glauca) et du requin mako (Isurus oxyrinchus) en Atlantique nord-est
Figure 3. – Observed mercury level (Hg) (u, l) and estimated values (s) using body mass index (BMI, kg/cm2) as a function of size (TL, cm). A: Blue shark (N = 37); B: Shortfin mako (N = 46).
Figure 1. – A in Potentially unsustainable fisheries of a critically-endangered pelagic shark species: the case of the blue shark (Prionace glauca) in the Western Mediterranean Sea
Figure 1. – A: Artisanal pelagic longliner from Torredembarra (Catalonia), Sep. 2012. B: Industrial pelagic longliner from Carboneras (Andalusia), Nov. 2014.
Data from: Large-scale genetic panmixia in the blue shark (Prionace glauca): a single worldwide population, or a genetic lag-time effect of the "grey zone" of differentiation?
The blue shark Prionace glauca, among the most common and widely studied pelagic sharks, is a top predator, exhibiting the widest distribution range. However, little is known about its population structure and spatial dynamics. With an estimated removal of 10 to 20 million individuals per year by fisheries, the species is classified as "Near Threatened" by International Union for Conservation of Nature. We lack the knowledge to forecast the long-term consequences of such a huge removal on this top predator itself and on its trophic network. The genetic analysis of more than 200 samples collected at broad scale (from Mediterranean Sea, North Atlantic and Pacific Oceans) using mtDNA and nine microsatellite markers allowed to detect signatures of genetic bottlenecks but a nearly complete genetic homogeneity across the entire studied range. This apparent panmixia could be explained by a genetic lag-time effect illustrated by simulations of demographic changes that were not detectable through standard genetic analysis before a long transitional phase here introduced as the "population grey zone". The results presented here can thus encompass distinct explanatory scenarios spanning from a single demographic population to several independent populations. This limitation prevents the genetic-based delineation of stocks and thus the ability to anticipate the consequences of severe depletions at all scales. More information is required for the conservation of population(s) and managements of stocks, which may be provided by large scale sampling not only of individuals worldwide, but also of loci genome-wide.
FIGURE A in Cestodes of the blue shark, Prionace glauca (Linnaeus 1758), (Carcharhiniformes: Carcharhinidae), off the west coast of Baja California Sur, Mexico
FIGURE A: Scolex of Platybothrium auriculatum with spines in the neck; B: Scanning electron micrographs (SEM) of scolex of P. auriculatum showing hooks each with axially extended base; C: Scolex of Prosobothrium japonicum showing neck posterior to scolex; D: Glandular discs sessile of P. japonicum; E: SEM of scolex P. japonicum showing the four glandular discs sessile; F: Scolex of Anthobothrium caseyi; G: SEM of scolex of A. caseyi; H:Scolex of Paraorygmatobothrium prionacis showing apical sucker and neck posterior to scolex.
FIG. 5 in Parasites of the blue shark (Prionace glauca L.), in the North-East Atlantic Ocean
FIG. 5. Frequency of occurrence of parasite Dominance Index values from Prionace glauca, with respect to (a) all infection sites and (b) the digestive tract only.
FIG. 2 in Parasites of the blue shark (Prionace glauca L.), in the North-East Atlantic Ocean
FIG. 2. The number of parasite species recorded from North-East Atlantic blue sharks, with respect to (a) all attachment sites, (b) the gills only and (c) the digestive tract only.
Data from: Large-scale genetic panmixia in the blue shark (Prionace glauca): a single worldwide population, or a genetic lag-time effect of the “grey zone” of differentiation?
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FIG. 1 in Parasites of the blue shark (Prionace glauca L.), in the North-East Atlantic Ocean
FIG. 1. General area from which blue sharks were collected during the present study.
FIG. 4 in Parasites of the blue shark (Prionace glauca L.), in the North-East Atlantic Ocean
FIG. 4. Ranked log-abundance of parasite species recorded from Prionace glauca during the present study.
FIG. 3 in Parasites of the blue shark (Prionace glauca L.), in the North-East Atlantic Ocean
FIG. 3. Cumulative parasite richness curve, showing the successive additions of parasite species.
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