ORCID Profile
0000-0002-4138-4966
Current Organisation
University of Southern Mississippi
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Publisher: Wiley
Date: 13-11-2020
DOI: 10.1111/JFB.14582
Publisher: Springer Science and Business Media LLC
Date: 02-05-2020
Publisher: Wiley
Date: 10-04-2277
DOI: 10.1002/EDN3.39
Publisher: Wiley
Date: 02-2023
DOI: 10.1002/ECE3.9837
Abstract: The Bull Shark ( Carcharhinus leucas ) faces varying levels of exploitation around the world due to its coastal distribution. Information regarding population connectivity is crucial to evaluate its conservation status and local fishing impacts. In this study, we s led 922 putative Bull Sharks from 19 locations in the first global assessment of population structure of this cosmopolitan species. Using a recently developed DNA‐capture approach (DArTcap), s les were genotyped for 3400 nuclear markers. Additionally, full mitochondrial genomes of 384 Indo‐Pacific s les were sequenced. Reproductive isolation was found between and across ocean basins (eastern Pacific, western Atlantic, eastern Atlantic, Indo‐West Pacific) with distinct island populations in Japan and Fiji. Bull Sharks appear to maintain gene flow using shallow coastal waters as dispersal corridors, whereas large oceanic distances and historical land‐bridges act as barriers. Females tend to return to the same area for reproduction, making them more susceptible to local threats and an important focus for management actions. Given these behaviors, the exploitation of Bull Sharks from insular populations, such as Japan and Fiji, may instigate local decline that cannot readily be replenished by immigration, which can in turn affect ecosystem dynamics and functions. These data also supported the development of a genetic panel to ascertain the population of origin, which will be useful in monitoring the trade of fisheries products and assessing population‐level impacts of this harvest.
Publisher: Wiley
Date: 09-12-2021
DOI: 10.1002/AQC.3721
Abstract: Formerly common in tropical and subtropical waters of the Atlantic Ocean, the Critically Endangered smalltooth sawfish, Pristis pectinata , underwent severe declines over the past century, restricting population(s) to south and south‐west Florida in the US, and Bahamian waters. Anecdotal evidence (e.g. encounter reports from the public) suggests that P. pectinata have recently been observed in historically occupied US waters however, no directed surveys have been conducted to verify their extent of occupancy. Here, environmental DNA (eDNA) surveys were used to investigate the occurrence of P. pectinata in three formerly occupied estuaries in US waters. Water s les were collected in the summer from the Indian River Lagoon and T a Bay, Florida, in 2018 and 2019, and from Mississippi Sound, Mississippi, in 2018, and screened for target DNA using a highly sensitive Droplet Digital™ polymerase chain reaction assay. Target DNA was detected at four sites in the Indian River Lagoon in 2018 and at one site in 2019 (average concentration: 0.086 copies μl −1 SE = 0.004), but was not detected in either year in T a Bay. Target DNA was also detected at three sites near Deer Island in Mississippi Sound in 2018 (average concentration: 0.090 copies μl −1 SE = 0.005). These surveys provide additional lines of evidence that P. pectinata is re‐occurring within two historically occupied estuaries in US waters. More comprehensive eDNA surveys in historically occupied regions, combined with clearly defined post‐survey management actions, can direct additional research and outreach initiatives in emerging priority areas, fostering recovery of this Critically Endangered species.
Publisher: Springer Science and Business Media LLC
Date: 10-11-2021
Publisher: Springer Science and Business Media LLC
Date: 27-07-2021
Location: United States of America
No related grants have been discovered for Nicole Phillips.