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13 results for “Carcharhinus amblyrhynchos”
Figure 1 in Potential Grey Reef Shark (Carcharhinus amblyrhynchos) Nursery on Seamounts Southwest of Guam
Figure 1. Location of Marianas sea mounts examined from most Northerly to Southerly respectively: Galvez Bank, Baby Bank, and Santa Rosa Reef in relation to Guam. Depths indicated are in meters. Red bars indicate locations of transects conducted in March 2018, blue bars, March 2019. Inset: Relative abundance of sighted C. amblyrhynchos per kilometer of transect for each bank (bars) and approximate surface area of each bank above the 40-meter depth contour (line). Depths using WGS84 chart datum from the NOAA nautical charts.
Data from: Like a rolling stone: Colonization and migration dynamics of the gray reef shark (Carcharhinus amblyrhynchos)
<p><span>Designing appropriate management plans requires knowledge of both the dispersal ability and what has shaped the current distribution of the species under consideration. Here we investigated the evolutionary history of the endangered gray reef shark (<em>Carcharhinus</em> <em>amblyrhynchos</em>) across its range by sequencing thousands of RAD-seq loci in 173 individuals in the Indo-Pacific (IP). We first bring evidence of the occurrence of a range expansion (RE) originating close to the Indo-Australian Archipelago (IAA) where two stepping-stone waves (east and westward) colonized almost the entire IP. </span><span>Coalescent modeling additionally highlighted </span><span>a homogenous connectivity (Nm~10 </span><span>per generation</span><span>) throughout the range, and</span><span> </span><span>an isolation-by-distance model suggested the absence of barriers to dispersal despite the affinity of <em>C</em>. <em>amblyrhynchos</em> to coral reefs. This coincides</span><span> with long-distance swims previously recorded, suggesting that the strong genetic structure at the IP scale (FST ~ 0.56 between its ends) is the consequence of its broad current distribution and organization in a large number of demes. Our results strongly suggest that management plans for the gray reef shark should be designed on a range-wide rather than a local scale due to its continuous genetic structure. We further </span><span>contrasted these results with those obtained previously for the sympatric but strictly lagoon-associated <em>Carcharhinus</em> <em>melanopterus</em>, known for its restricted dispersal ability. <em>C</em>. <em>melanopterus</em> exhibits a similar RE dynamic but is characterized by stronger genetic structure and a non-homogeneous connectivity largely dependent on local coral reefs availability. </span><span>This sheds new light on shark evolution, emphasizing the roles of IAA as a source of biodiversity and of life history traits in shaping the extent of genetic structure and diversity.</span></p>
Data from: Like a rolling stone: Colonization and migration dynamics of the gray reef shark (Carcharhinus amblyrhynchos)
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Data from: Connectivity in grey reef sharks (Carcharhinus amblyrhynchos) determined using empirical and simulated genetic data
Grey reef sharks (Carcharhinus amblyrhynchos) can be one of the numerically dominant high order predators on pristine coral reefs, yet their numbers have declined even in the highly regulated Australian Great Barrier Reef (GBR) Marine Park. Knowledge of both large scale and fine scale genetic connectivity of grey reef sharks is essential for their effective management, but no genetic data are yet available. We investigated grey reef shark genetic structure in the GBR across a 1200 km latitudinal gradient, comparing empirical data with models simulating different levels of migration. The empirical data did not reveal any genetic structuring along the entire latitudinal gradient sampled, suggesting regular widespread dispersal and gene flow of the species throughout most of the GBR. Our simulated datasets indicate that even with substantial migrations (up to 25% of individuals migrating between neighboring reefs) both large scale genetic structure and genotypic spatial autocorrelation at the reef scale were maintained. We suggest that present migration rates therefore exceed this level. These findings have important implications regarding the effectiveness of networks of spatially discontinuous Marine Protected Areas to protect reef sharks.
Data from: Grouper (Epinephelidae) spawning aggregations affect activity space of grey reef sharks, Carcharhinus amblyrhynchos, in Pohnpei, Micronesia
Fish spawning aggregations (FSA) act as biological hotspots that concentrate food and nutrients across a broad trophic spectrum. In Pohnpei (Federated States of Micronesia), 20 female grey reef sharks (Carcharhinus amblyrhynchos) were acoustically tagged at two multi-species grouper (Epinephelidae) FSA to examine the likelihood that these mesopredators utilize FSA as a seasonal food source. Both FSA sites are within small-scale MPAs, thus providing a secondary opportunity to examine their conservation potential during these ephemeral events. Shark movement and residency was gauged against known spatial and temporal grouper reproductive patterns using an array of 15 and 50 acoustic receivers at Ant Atoll and Pohnpei (Island), respectively. Activity space was investigated using Kernel Density estimates of individual sharks, and residency indices (RI) were analyzed based on daily and monthly occurrence at the array. Three distinct residency patterns were identified: transient, semi-transient, or resident (Daily RI <0.40, >0.40<0.80, or >0.80, respectively). Generalized linear mixed models (GLMMs) were used to identify biological and environmental factors influencing shark activity space, including month, temperature, shark size, spawning month, and residency pattern. Findings revealed significant changes in average monthly residency indices and kernel densities during spawning months in support of an opportunistic foraging strategy around FSA. Monthly residency was higher during spawning months among semi-resident and transient sharks, while average monthly activity space was concentrated around FSA. Best-fit models for the GLMM indicated that activity spaces were most influenced by month and grouper spawning month. Seven of 20 sharks demonstrated inter-island movement and wide variations in individual movement and spatial requirements were shown. The concentration of sharks and groupers at unprotected FSA sites increases their vulnerability to fishing and supports the need for combined area and non-area management measures to effectively protect these species.
FIGURE 3. Female Carcharhinus amblyrhynchos, 717 in Misidentification of Carcharhinus galapagensis (Snodgrass & Heller, 1905) in the Southwest Pacific Ocean
FIGURE 3. Female Carcharhinus amblyrhynchos, 717 mm TL, 40 Mile Reef seamount, Pitcairn Islands, 18 June 1994 (NMNZ P.031469). Image: C. Struthers, Museum of New Zealand Te Papa Tongarewa.
Data from: Connectivity in grey reef sharks (Carcharhinus amblyrhynchos) determined using empirical and simulated genetic data
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Data from: Grouper (Epinephelidae) spawning aggregations affect activity space of grey reef sharks, Carcharhinus amblyrhynchos, in Pohnpei, Micronesia
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Data from: Genetic structure and signatures of selection in grey reef sharks (Carcharhinus amblyrhynchos)
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Carcharhinus amblyrhynchos and Carcharhinus albimarginatus underwater acoustic telemetry data - Chagos Archipelago 2014-2018
<p>A wide array of technologies are available for gaining insight into the movement of wild aquatic animals. Although acoustic telemetry may lack the fine-scale resolution of some satellite tracking technologies, the substantially longer battery life can yield important long-term data on behaviour and movement for low per-unit cost. Typically, however, receiver arrays are designed to maximise spatial coverage at the cost of positional accuracy leading to potentially longer detection gaps as individuals move out of range between monitored locations. This is particularly true when these technologies are deployed to monitor species in hard-to-access locations. We develop a novel approach to analysing acoustic telemetry data, using the timing and duration of gaps between animal detections to classify movement behaviours into 'restricted' or potential wider 'out of range' movements synonymous with longer distance dispersal. We apply this method to investigate spatial and temporal segregation of inferred movement patterns in two sympatric species of reef shark within a large, remote Marine Protected Area. Drivers of these movements were identified using generalised linear mixed models and multi-model inference. Species, diel period and season were significant predictors of 'out of range' movements. Silvertip sharks were overall more likely to undertake 'out of range' movements, compared to grey reef sharks, indicating spatial segregation, and corroborating previous stable isotope work between these two species. High individual variability in 'out of range' movements in both species was also identified. We present a novel gap analysis of telemetry data to help infer differential movement and space use patterns where acoustic coverage is imperfect and other tracking methods impractical. In remote locations, inference may be the best available tool and this approach shows that acoustic telemetry gap analysis can be used for comparative studies in fish ecology, or combined with other research techniques to better understand functional mechanisms driving behaviour.</p>
Carcharhinus amblyrhynchos and Carcharhinus albimarginatus underwater acoustic telemetry data - Chagos Archipelago 2014-2018
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APEX_New_Caledonia_Carcharhinus_amblyrhynchos_Raw_Genetic_Sequences
<p>This dataset contains raw genetic sequence data from 344 Carcharhinus amblyrhynchos (grey reef shark) individuals collected in the New Caledonian Archipelago between July 2015 and November 2016. The data were collected under permits to Laurent Vigliola by the Government of New Caledonia (permit #2015-1351/GNC), the Northern Province of New Caledonia (permit #60912-1508-2015/JJC) and the Southern Province of New Caledonia (permits #479-2016/ARR/DENV and #2093-2016/ARR/DENV). It was used and processed during the PhD of Germain Boussarie. Collection was performed during the APEX project led by Laurent Vigliola. The metadata contains fish identification number, sampling site, latitude and longitude. Additional information (date, fish length, maturity, sex, acoustic tag number) are also given. Corresponding SNP data are on Zenodo at <a href="https://doi.org/10.5281/zenodo.5943789">https://doi.org/10.5281/zenodo.5943789</a>.</p>
APEX_New_Caledonia_Carcharhinus_amblyrhynchos_SNP
<p>This dataset contains single nucleotide polymorphisms (SNP) data from 344 Carcharhinus amblyrhynchos (grey reef shark) individuals collected in the New Caledonian Archipelago between July 2015 and November 2016. The data were collected under permits to Laurent Vigliola by the Government of New Caledonia (permit #2015-1351/GNC), the Northern Province of New Caledonia (permit #60912-1508-2015/JJC) and the Southern Province of New Caledonia (permits #479-2016/ARR/DENV and #2093-2016/ARR/DENV). It was used and processed during the PhD of Germain Boussarie. Collection was performed during the APEX project led by Laurent Vigliola. The metadata contains fish identification number, sampling site, latitude and longitude. Additional information (date, fish length, maturity, sex, acoustic tag number) are also given. Corresponding raw genetic sequences are on Zenodo at <a href="https://doi.org/10.5281/zenodo.5935133">https://doi.org/10.5281/zenodo.5935133</a>.</p>
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