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28 results for “Sphyrna”
Figure 3 in First record of scalloped hammerhead shark Sphyrna lewini (Carcharhiniformes: Sphyrnidae) in freshwater habitat
Figure 3. Another side of S. lewini on 6 April 2020 in Mahakam river at Muara Baroh village, Muara Pahu subdistrict, Kutai Barat district, East Kalimantan province (Photo: Yuni Sri Wahyuni).
Figure 1 in First record of scalloped hammerhead shark Sphyrna lewini (Carcharhiniformes: Sphyrnidae) in freshwater habitat
Figure 1. Location of known S. lewini in Borneo. Yelow circles are S. lewini recorded in Bornean waters after Last et al. (2010), and red circle is recent inland record from Mahakam river, East Kalimantan province.
Fig. 1 in Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary
Fig. 1. Location of Cassurubá Extractive Reserve, Abrolhos Bank, eastern Brazil. Numbers represent fishing villages where fishers were interviewed. Caravelas city: 1- Barra (n= 16), 2- Massangano (n = 8), 3- Calabouço (n = 6), 4- Tapera (n = 8), 5- Caribê (n = 12). Nova Viçosa city: 6- Peróba (n = 12), 7- Barra Velha (n= 11) and 8- Tranqueira (n= 6).
Fig. 3 in Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary
Fig. 3. (a) Number of fishers that had already caught Sphyrna tudes, distributed over fishers' generations on Abrolhos Bank; (b) Mean weight (+95% CI) of Sphyrna tudes caught over three generations of fishers. Different letters above bars indicate significant differences (p <0.05).
Fig. 4 in Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary
Fig. 4. Food items consumed by Sphyrna tudes according to fishers´ local ecological knowledge of Cassurubá Extractive Reserve, eastern Brazil.
Fig. 2 in Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary
Fig. 2. Fishing gear used to catch Sphyrna tudes in Cassurubá Extractive Reserve, eastern Brazil.
Genetic population dynamics of the critically endangered scalloped hammerhead shark (Sphyrna lewini) in the Eastern Tropical Pacific
<p><span>The scalloped hammerhead shark, </span><span><em>Sphyrna</em> <em>lewini</em></span><span>, is a Critically Endangered, migratory species known for its tendency to form iconic and visually spectacular large aggregations. Herein, we investigated the population genetic dynamics of the scalloped hammerhead across much of its distribution in the Eastern Tropical Pacific (ETP), ranging from Costa Rica to Ecuador, focusing on young‐of‐the‐year animals from putative coastal nursery areas and adult females from seasonal aggregations that form in the northern Galápagos Islands. Nuclear microsatellites and partial mitochondrial control region sequences showed little evidence of population structure, suggesting that scalloped hammerheads in this ETP region comprise a single genetic stock. Galápagos aggregations of adults were not comprised of related individuals, suggesting that kinship does not play a role in the formation of the repeated, annual gatherings at these remote offshore locations. Despite high levels of fisheries exploitation of this species in the ETP, the adult scalloped hammerheads here showed greater genetic diversity compared with adult conspecifics from other parts of the species' global distribution. A phylogeographic analysis of available, globally sourced, mitochondrial control region sequence data (</span><span>n</span><span> = 1,818 sequences) revealed that scalloped hammerheads comprise three distinct matrilines corresponding to the three major world ocean basins, highlighting the need for conservation of these evolutionarily unique lineages. This study provides the first view of the genetic properties of a scalloped hammerhead aggregation, and the largest sample size‐based investigation of population structure and phylogeography of this species in the ETP to date.</span></p>
Genetic population dynamics of the critically endangered scalloped hammerhead shark (Sphyrna lewini) in the Eastern Tropical Pacific
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Raw sequencing data (3RAD) for the smooth hammerhead shark Sphyrna zygaena
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Data from: Evidence for gene flow from the Gulf of Mexico to the Atlantic Ocean in bonnethead sharks (Sphyrna tiburo)
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FIGURE 8 in Sphyrna gilberti sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the western Atlantic Ocean
FIGURE 8. Box and whisker plot for number of precaudal vertebrae for Sphyrna gilberti sp. nov. (n = 54) and S. lewini (n = 26) specimens examined in this study. Bars represent minimum and maximum observed values, grey box represents lower and upper quantiles, + indicates the mean, center line represents the median and the notch indicates the 95% confidence interval around the median.
FIGURE 6 in Sphyrna gilberti sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the western Atlantic Ocean
FIGURE 6. Dorsal (A) and ventral (B) views of the cephalofoil from the holotype of Sphyrna gilberti sp. nov. collected in Bulls Bay, South Carolina, U.S.A. UF 183577, 467 mm STL. Note that indention in ventral view of the left nacelle is an artifact of preservation.
FIGURE 5 in Sphyrna gilberti sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the western Atlantic Ocean
FIGURE 5. Holotype of Sphyrna gilberti sp. nov. collected in Bulls Bay, South Carolina, U.S.A. UF 183577, 467 mm STL.
FIGURE 4 in Sphyrna gilberti sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the western Atlantic Ocean
FIGURE 4. Plot of the first two principal components for five meristic variables for putative Sphryna lewini specimens collected in the coastal waters of South Carolina. Gray circles indicate specimens with genotypes corresponding to S. lewini while black circles indicate specimens with genotypes identified as a cryptic species by Quattro et al. 2006.
FIGURE 1 in Sphyrna gilberti sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the western Atlantic Ocean
FIGURE 1. Collection locations of Sphyrna gilberti sp. nov. off the coast of South Carolina, U.S.A.. Black circle indicates sampling location for the holotype (UF 183577)..
FIGURE 3 in Sphyrna gilberti sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the western Atlantic Ocean
FIGURE 3. Plot of the first two principal components for 67 size-adjusted morphometric variables for putative Sphryna lewini specimens collected in the coastal waters of South Carolina. Gray circles indicate specimens with genotypes corresponding to S. lewini while black circles indicate specimens with genotypes identified as a cryptic species by Quattro et al. 2006.
FIGURE 2 in Sphyrna gilberti sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the western Atlantic Ocean
FIGURE 2. Phylogenetic relationships among mtDNA control region haplotypes. Parsimony reconstructions are depicted. Numbers near nodes are maximum parsimony/maximum likelihood bootstrap values. Haplotype descriptions, codes and collection locations can be found in Quattro et al. (2006).
FIGURE 8 in Sphyrna alleni sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the Caribbean and the Southwest Atlantic.
FIGURE 8. Sphyrna alleni sp. nov. A) Horizontal view of the shark; B) dermal denticles; C) upper and D) lower teeth; Dorsal and ventral representation of the head shape of E) Female and F) Male. Illustrations: Gina Clementi.
FIGURE 5 in Sphyrna alleni sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the Caribbean and the Southwest Atlantic.
FIGURE 5. Neighbor joining concatenated tree (COI + mtCR) for S. aff. tiburo and S. tiburo. Branch lengths and scale represent the proportion of polymorphic sites between haplotypes, and bootstrap values given in percentage (%).
FIGURE 4 in Sphyrna alleni sp. nov., a new hammerhead shark (Carcharhiniformes, Sphyrnidae) from the Caribbean and the Southwest Atlantic.
FIGURE 4. Boxplot of the number of precaudal vertebrae for S. aff. tiburo (Belize, n = 12) and S. tiburo (Florida, U.S, n = 11) specimens.
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