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Peer-reviewedCC BY 4.0PLOS One

Understanding spatial heterogeneity of rocky reef demersal fish assemblages: Links to conservation plans in the Juan Fernández Archipelago Marine Protected Area in the Southeastern Pacific

  • Braulio Tapia1
  • Billy Ernst2
  • Stéphane Gauthier3
  • Cole C. Monnahan4
  • Carolina Parada5
  • Pablo Rivara6
  • Noble Hendrix7
7 affiliations
  1. 1Programa de Magíster en Ciencias con mención en Pesquerías, Universidad de Concepción, Concepción, Chile
  2. 2Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile
  3. 3Departamento de Oceanografía, Universidad de Concepción, Barrio Universitario s/n, Concepción, Chile
  4. 4Millennium Nucleus Ecology and Sustainable Management of Oceanic Islands (ESMOI), Coquimbo, Chile
  5. 5Fisheries and Oceans Canada, Institute of Ocean Sciences, Sidney, British Columbia, Canada
  6. 6Department of Biology, University of Victoria, Victoria, British Columbia, Canada
  7. 7Resource Ecology and Fisheries Management Division, Alaska Fisheries Science Center, National Oceanic and Atmospheric Administration (NOAA), Seattle, Washington, United States of America
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Abstract

Spatial heterogeneity linked to fish assemblages has been key to advancing conservation plans and assessing marine resources in remote ecosystems. The Juan Fernández Archipelago is a remote and highly heterogeneous geologic hotspot located on the Nazca plate (SE Pacific), comprising three islands, numerous seamounts and guyots, and a highly rugged coastal marine shelf. Hundreds of rocky reefs of various sizes characterize this insular coastal shelf, supporting diverse finfish populations of interest for the Robinson Crusoe Island artisanal fishing fleet. Two hydroacoustic surveys were conducted on the insular shelf of Robinson Crusoe and Santa Clara Islands. Reef distribution and morphometric attributes (length, height, depth strata, and geographic zones) were characterized across the shelf seascape. To identify traits that correlated with the presence and acoustic backscatter of demersal fish aggregations, a set of statistical models was implemented. Results indicate that reefs were present up to ~200 meters in depth around the islands, with the northern region hosting small and tall reefs, while the southern region had the fewest reefs but the largest. The findings indicated that 75% of the fish aggregations observed outside of reefs were within 280 m of them. Also, there was a higher probability of fish aggregations occurring in depths up to 150 m (~90%) given the presence of reefs, compared to the relatively flat seafloor (~20%). Reef–scale analysis showed that the longer and taller the reef, the higher the acoustic backscatter from fish. These findings highlight the ecological value of reefs for fish populations throughout the insular shelf seascape. In addition, this study highlights the usefulness of small–scale hydroacoustic surveys as a monitoring tool to assess the association between ocean–floor spatial heterogeneity and demersal fish assemblages, and the implementation of effective periodic surveys within the Juan Fernández Marine Protected Area.

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Cite

BibTeXRIS
BibTeX
@article{tapia2026understanding,
  title = {{Understanding spatial heterogeneity of rocky reef demersal fish assemblages: Links to conservation plans in the Juan Fernández Archipelago Marine Protected Area in the Southeastern Pacific}},
  author = {Braulio Tapia and Billy Ernst and Stéphane Gauthier and Cole C. Monnahan and Carolina Parada and Pablo Rivara and Noble Hendrix},
  journal = {PLOS One},
  year = {2026},
  month = oct,
  doi = {10.1371/journal.pone.0358459},
  url = {https://doi.org/10.1371/journal.pone.0358459},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Understanding spatial heterogeneity of rocky reef demersal fish assemblages: Links to conservation plans in the Juan Fernández Archipelago Marine Protected Area in the Southeastern Pacific
AU  - Braulio Tapia
AU  - Billy Ernst
AU  - Stéphane Gauthier
AU  - Cole C. Monnahan
AU  - Carolina Parada
AU  - Pablo Rivara
AU  - Noble Hendrix
PY  - 2026
DA  - 2026/10/09
JO  - PLOS One
DO  - 10.1371/journal.pone.0358459
UR  - https://doi.org/10.1371/journal.pone.0358459
AB  - Spatial heterogeneity linked to fish assemblages has been key to advancing conservation plans and assessing marine resources in remote ecosystems. The Juan Fernández Archipelago is a remote and highly heterogeneous geologic hotspot located on the Nazca plate (SE Pacific), comprising three islands, numerous seamounts and guyots, and a highly rugged coastal marine shelf. Hundreds of rocky reefs of various sizes characterize this insular coastal shelf, supporting diverse finfish populations of interest for the Robinson Crusoe Island artisanal fishing fleet. Two hydroacoustic surveys were conducted on the insular shelf of Robinson Crusoe and Santa Clara Islands. Reef distribution and morphometric attributes (length, height, depth strata, and geographic zones) were characterized across the shelf seascape. To identify traits that correlated with the presence and acoustic backscatter of demersal fish aggregations, a set of statistical models was implemented. Results indicate that reefs were present up to ~200 meters in depth around the islands, with the northern region hosting small and tall reefs, while the southern region had the fewest reefs but the largest. The findings indicated that 75% of the fish aggregations observed outside of reefs were within 280 m of them. Also, there was a higher probability of fish aggregations occurring in depths up to 150 m (~90%) given the presence of reefs, compared to the relatively flat seafloor (~20%). Reef–scale analysis showed that the longer and taller the reef, the higher the acoustic backscatter from fish. These findings highlight the ecological value of reefs for fish populations throughout the insular shelf seascape. In addition, this study highlights the usefulness of small–scale hydroacoustic surveys as a monitoring tool to assess the association between ocean–floor spatial heterogeneity and demersal fish assemblages, and the implementation of effective periodic surveys within the Juan Fernández Marine Protected Area.
SN  - 1932-6203
ER  -