Spatial overlap between South American fur seal foraging effort and commercial trawl fisheries in the Falkland Islands

Riaz, Javed; Orben, Rachael A.; Jones, Kayleigh A.; Shapiro, Megan; Winter, Andreas; Brickle, Paul; Baylis, Alastair M.M.

doi:10.1016/j.gecco.2023.e02615

Cited by 3 publications

(2 citation statements)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All PTT data for SAFS and MAG were regularised at 1-hour time steps, while GPS data for SAFS and BBA were regularised at 15-minute and 10-minute time steps, respectively. The programming of these species-and device-specific time-steps within the movement model were chosen based on visual and comparative assessment of predicted location estimates with the raw location fixes for each individual (Riaz et al 2021(Riaz et al , 2023. The final SSM dataset contained location information for 460 individuals, which comprised of 341 BBA, 74 SAFS and 45 MAG.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Connectivity of marine predators over the Patagonian Shelf during the highly pathogenic avian influenza (HPAI) outbreak

Riaz,

Orben,

Gamble

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

Animal movement and population connectivity are key areas of uncertainty in efforts to understand and predict the spread of infectious disease. The emergence of highly pathogenic avian influenza (HPAI) in South America poses a significant threat to globally significant populations of colonial breeding marine predators in the South Atlantic. Yet, there is a poor understanding of which species or migratory pathways may facilitate disease spread. Compiling one of the largest available animal tracking datasets in the South Atlantic, we examine connectivity and inter-population mixing for colonial breeding marine predators tagged at the Falkland Islands. We reveal extensive connectivity for three regionally dominant and gregarious species over the Patagonian Shelf. Black browed albatrosses (BBA), South American fur seals (SAFS) and Magellanic penguins (MAG) used coastal waters along the Atlantic coast of South America (Argentina and Uruguay). These behaviours were recorded at or in close proximity to breeding colonies and haul-out areas with dense aggregations of marine predators. Transit times to and from the Falkland Islands to the continental coast ranged from 0.2 – 70 days, with 84% of animals making this transit within 4 days - a conservative estimate for HPAI infectious period. Our findings show the incursion of HPAI to the Falkland Islands marine predator community is a highly credible threat, which may be facilitated by BBA, SAFS and MAG connectivity with South America. This information is vital in supporting HPAI disease surveillance, risk assessment and marine management efforts across the region.SignificanceThe recent emergence of highly pathogenic avian influenza (HPAI) in South America poses a major threat to globally significant marine predator populations in the South Atlantic. There is extensive connectivity over the southern Patagonian Shelf between regionally dominant seal and seabird populations, with potential for large-scale pathogen spread. Despite this connectivity, outbreaks of HPAI are unevenly distributed across the region. Connectivity information is integral for regional disease surveillance, predictive modelling and population viability assessments.

show abstract

Section: Methodsmentioning

confidence: 99%

“…Details of the tracking data compiled are provided in Table 1 and Table S1. Animal handling and tag deployment procedures are available in source literature (Campioni et al 2017, Baylis et al 2019b, Riaz et al 2023) and supplementary material. (exceeding 4 m s − 1 for SAFS, 10 m s − 1 for MAG and 20 m s − 1 for BBA).…”

Section: Methodsmentioning

confidence: 99%

Connectivity of marine predators over the Patagonian Shelf during the highly pathogenic avian influenza (HPAI) outbreak

Riaz,

Orben,

Gamble

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Seal-fishery interactions in the Falkland Islands—operational and environmental factors drive resource competition

Riaz,

Büring,

van der Grient

et al. 2024

ICES Journal of Marine Science

View full text Add to dashboard Cite

Direct interactions between marine mammals and commercial fisheries are a worldwide conservation challenge. Observer programmes remain the most effective and reliable method for collecting data on these interactions. In the Falkland Islands—home to globally significant seal populations and commercial squid fisheries, seal-fishery interactions have escalated in recent years, prompting management concerns. Complete observer coverage within the squid fishery presents a valuable opportunity to investigate the nature, extent, and drivers of these interactions. Integrating multi-year observer records with extensive ancillary (i.e. vessel logbook and oceanographic) datasets, we examine the operational and environmental factors influencing the occurrence of seal-fishery interactions. Our findings show interactions most frequently occur in the main squid fishing grounds during trawls associated with high catch quantities. Assessment of long-term catch data (both finfish and squid) also suggests the increase in seal-fishery interactions may be caused by collapses in dominant finfish stocks over the past 20 years, constricting foraging resources available to seals. Taken together, our findings indicate resource competition may be a mechanism of interactions. To help mitigate this issue, we advocate for the development of ecosystem-based fisheries management, which considers the trophic effects of fishing practices and the energetic requirements of local marine predator populations.

show abstract

Coastal connectivity of marine predators over the Patagonian Shelf during the highly pathogenic avian influenza outbreak

Riaz,

Orben,

Gamble

et al. 2024

Ecography

View full text Add to dashboard Cite

Animal movement and population connectivity are key areas of uncertainty in efforts to understand and predict the spread of infectious disease. The emergence of highly pathogenic avian influenza (HPAI) in South America poses a significant threat to globally significant populations of colonial breeding marine predators in the South Atlantic. Yet, there is a poor understanding of which species or migratory pathways may facilitate disease spread. Compiling one of the largest available animal tracking datasets in the South Atlantic, we examine connectivity and inter‐population mixing for colonial breeding marine predators tagged at the Falkland Islands. We reveal extensive connectivity for three regionally dominant and gregarious species over the Patagonian Shelf. Black‐browed albatrosses (BBA), South American fur seals (SAFS) and Magellanic penguins (MAG) used coastal waters along the Atlantic coast of South America (Argentina and Uruguay). These behaviours were recorded at or in close proximity to breeding colonies and haul‐out areas with dense aggregations of marine predators. Transit times to and from the Falkland Islands to the continental coast ranged from 0.2–70 days, with 84% of animals making this transit within 4 days ‐ a conservative estimate for HPAI infectious period. Our findings demonstrate BBA, SAFS and MAG connectivity between the Falkland Islands and mainland South America over an expansive spatial network and numerous pathways, which has implications for infectious disease persistence, transmission and spread. This information is vital in supporting HPAI disease surveillance, risk assessment and marine management efforts across the region.

show abstract

Spatial overlap between South American fur seal foraging effort and commercial trawl fisheries in the Falkland Islands

Cited by 3 publications

References 92 publications

Connectivity of marine predators over the Patagonian Shelf during the highly pathogenic avian influenza (HPAI) outbreak

Connectivity of marine predators over the Patagonian Shelf during the highly pathogenic avian influenza (HPAI) outbreak

Seal-fishery interactions in the Falkland Islands—operational and environmental factors drive resource competition

Coastal connectivity of marine predators over the Patagonian Shelf during the highly pathogenic avian influenza outbreak

Contact Info

Product

Resources

About