Elasmobranchs of the Galapagos Marine Reserve

Hearn, Alex; Acuna, David; Peñaherrera, César; Green, Jonathan; Marshall, Andrea D.; Guerrero, M; Shillinger, George L.

doi:10.1007/978-3-319-02769-2_2

Cited by 43 publications

(41 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further, reef manta rays access both coastal habitats and offshore, pelagic habitats where they are presumably foraging Jaine et al, 2014). Similarly, oceanic manta rays are predominantly resident based on our findings, but also make occasional long-distance movements (Hearn et al, 2014), and feed both in coastal (JDS unpubl.) and deeper, offshore habitats (Stewart et al, in press).…”

Section: Discussionmentioning

confidence: 84%

“…In some cases even populations of oceanic manta rays with relatively restricted ranges can straddle international borders, for example in Peruvian and Ecuadorian waters (Hearn et al, 2014). Under such circumstances international efforts to coordinate management action remain a valuable conservation tool and should not be abandoned.…”

Section: Discussionmentioning

confidence: 99%

“…The large body size of oceanic manta rays makes the species physiologically capable of swimming long distances. For example, one individual was recorded traveling from mainland Ecuador to the Galapagos Islands, over 1400 km straight-line distance (Hearn et al, 2014). Additionally, long-distance movements may account for the occasional sightings of oceanic manta rays in regions outside their typical distribution (Duffy and Abbott, 2003;Couturier et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…international, national, or local). The few published tagging studies on the species have so far identified few long-distance movements (Graham et al, 2012;Hearn et al, 2014), and stock structure and population connectivity remain entirely unexplored. Additional information on the spatial ecology and population structure of the species is necessary to evaluate current management plans and develop new strategies to improve their efficacy in halting or reversing ongoing population declines.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

See 3 more Smart Citations

Spatial ecology and conservation of Manta birostris in the Indo-Pacific

Stewart

Beale

Fernando

et al. 2016

Biological Conservation

View full text Add to dashboard Cite

Information on the movements and population connectivity of the oceanic manta ray (Manta birostris) is scarce. The species has been anecdotally classified as a highly migratory species based on the pelagic habitats it often occupies, and migratory behavior exhibited by similar species. As a result, in the absence of ecological data, population declines in oceanic manta have been addressed primarily with international-scale management and conservation efforts. Using a combination of satellite telemetry, stable isotope and genetic analyses we demonstrate that, contrary to previous assumptions, the species appears to exhibit restricted movements and finescale population structure. M. birostris tagged at four sites in the Indo-Pacific exhibited no long-range migratory movements and had non-overlapping geographic ranges. Using genetic and isotopic analysis, we demonstrate that the observed movements and population structure persist on multi-year and generational time scales. These data provide the first insights into the long-term movements and population structure of oceanic manta rays, and suggest that bottom-up, local or regional approaches to managing oceanic mantas could prove more effective than existing, international-scale management strategies. This case study highlights the importance of matching the scales at which management and relevant ecological processes occur to facilitate the effective conservation of threatened species.

show abstract

Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

See 2 more Smart Citations

Spatial ecology and conservation of Manta birostris in the Indo-Pacific

Stewart

Beale

Fernando

et al. 2016

Biological Conservation

View full text Add to dashboard Cite

show abstract

“…The Galapagos Archipelago (0°40’S 90°33’W) is located 1,000 km from the coast of continental Ecuador. The archipelago is made up of 13 major islands and over 100 islets and emergent rocks, along with an unknown number of shallow and deep seamounts (33). The five ETP marine reserves (Revillagigedo, Clipperton, Cocos, Malpelo and Galapagos) are characterized by their complex oceanography, high diversity and abundance of pelagic species with high economical value for fisheries and tourism (34).…”

Section: Methodsmentioning

confidence: 99%

Shark movements in the Revillagigedo Archipelago and connectivity with the Eastern Tropical Pacific

Lara-Lizardi

Hoyos-Padilla

Hearn

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Long-distance movements of sharks within and between islands pose substantial challenges for resource managers working with highly migratory species. When no-take zones do not cover the critical areas that sharks use as part of their lifecycle, exposure to fishing activities can be significant. Shark movements between the Marine Protected Areas (MPAs) of the Eastern Tropical Pacific (ETP) have been studied for several years, however little is known about the strength of connectivity between these islands. We analyzed the extensive MigraMar ultrasonic telemetry dataset to assess how Galapagos sharks (Carcharhinus galapagensis) and silky sharks (Carcharhinus falciformis) use different islands as stepping-stones during their migrations within the Revillagigedo National Park and other ETP islands. Of the 66 sharks monitored, 63.5% moved within the same island, 25.4% between two islands or more and only 10.1% across different MPAs. A C. falciformis tagged in Roca Partida Island, Revillagigedo, travelled to Clipperton Atoll and another one tagged in Darwin Island travelled to the atoll on two different years. The largest movement of C. galapagensis was accomplished by a shark tagged at Socorro Island, Revillagigedo, later detected at Clipperton and finally recorded in Darwin Island, Galapagos. This last path was in fact, one of the longest movements ever recorded for the species. Although long-distance dispersion was not common, our results highlight the need for co-operation between different countries to ensure adequate protection for sharks in the form of swimways and other conservation tools in the ETP.

show abstract