Asymmetric connectivity of the lobster <i> Panulirus pascuensis</i> in remote islands of the southern Pacific: importance for its management and conservation

Meerhoff, Erika; Yannicelli, Beatriz; Dewitte, Boris; Díaz-Cabrera, Ernesto; Vega‐Retter, Caren; Ramos, Marcel; Bravo, Luis; Concha, Emilio; Hernández-Vaca, Freddy; Véliz, David

doi:10.5343/bms.2017.1114

Cited by 13 publications

(10 citation statements)

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“…2. The biophysical model used in this study was previously tested for the lobster Panulirus pascuensis, showing how difficult it is to obtain larval movement between areas even for species with a long planktonic larval duration, such as the Easter Island spiny lobster (see Meerhoff et al, 2018). It is important to note that biophysical simulations depend strongly on the parameters used (see Christensen et al, 2007), affecting the estimation of population connectivity.…”

Section: Discussionmentioning

confidence: 99%

Weak connectivity and population cohesiveness in rudderfish Kyphosus sandwicensis (Teleostei: Kyphosidae) inhabiting remote oceanic islands

Valencia

Meerhoff

Díaz-Cabrera

et al. 2020

Aquatic Conservation

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1. Population connectivity has a fundamental role in metapopulation dynamics, with important implications in conservation. Easter Island (EI) and Salas y Gómez Island (SG) in the Pacific Ocean are ideal for the study of population connectivity because they are separated by 415 km and isolated from other islands in the Pacific Ocean by >2,000 km. 2. Considering that dispersal processes could play a critical role in the persistence of its populations, the connectivity pattern of the rudderfish Kyphosus sandwicensis was evaluated between EI and SG using both a population genetics and a biophysical modelling approach. 3. The variability in the control region of the mitochondrial DNA did not show a significant phylogeographical pattern, and the variability in 16 microsatellite loci suggested that individuals of K. sandwicensis located at EI and SG belong to the same genetic population. However, historical migration showed that 0.2% of the recruits at EI come from SG and that 0.15% at SG come from EI per year. 4. Using simulated larval release during September and a larval development of 30 days in the plankton, biophysical modelling did not detect migration between the islands. Furthermore, self-recruitment shows interannual variation ranging from 5 to 10% of the total released larvae. 5. Whereas the genetic data showed a lack of population genetic structure but low connectivity of K. sandwicensis between EI and SG, the biophysical modelling showed null movement of particles between the islands. Stochastic movement of larvae or adults could explain the pattern observed, with rafting as an example. These low-frequency and stochastic movements may be important in maintaining the cohesiveness between EI and SG.

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Section: Discussionmentioning

confidence: 99%

Weak connectivity and population cohesiveness in rudderfish Kyphosus sandwicensis (Teleostei: Kyphosidae) inhabiting remote oceanic islands

Valencia

Meerhoff

Díaz-Cabrera

et al. 2020

Aquatic Conservation

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“…Recent studies have examined the connectivity of two reefassociated species, the Easter Island spiny lobster Panulirus pascuensis Reed, 1954 and the Easter island rudderfish Kyphosus sandwicensis (Sauvage, 1880), on the western end of the Salas y Goḿez Ridge using variability of microsatellite loci (Meerhoff et al, 2018;Valencia et al, 2021). These studies found weak connectivity amongst marine fauna populations located on Rapa Nui and Salas y Goḿez Island (415 km away), findings that are consistent with other studies that indicate weak connectivity within the ridges for many reef taxa (ComitéOceanografco Nacional de Chile, 2017;Friedlander et al, 2021).…”

Section: Genetic and Larval Connectivitymentioning

confidence: 99%

Borderless conservation: Integrating connectivity into high seas conservation efforts for the Salas y Gómez and Nazca ridges

et al. 2022

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Connectivity is essential to consider in area-based marine conservation measures because it greatly impacts vital ecological processes (e.g., recycling nutrients, regulating temperature, sequestering carbon, and supporting the life cycle of species). However, it is generally not well studied or integrated into conservation measures, particularly in the Southeast Pacific. This region is home to the Salas y Gómez and Nazca ridges, two adjacent seamount chains that stretch between the Peruvian coast and Rapa Nui (i.e., Easter Island). The area has been recognized for its exceptional natural and cultural significance as well as one of the most important global areas to protect. However, over 73% of the ridges are in areas beyond national jurisdiction, where they are unprotected and under threat. This study provides a synthesis of what we know about connectivity in the Salas y Gómez and Nazca ridges and provides practical recommendations for integrating this knowledge into conservation and management measures for the region. While data on connectivity is still limited, it should not constrain the development of conservation measures, which should be co-designed and co-developed, leveraging the expertise of international working groups throughout the region. Due to their high rates of endemism, as well as importance as migratory corridors, enacting large-scale conservation measures would address important conservation considerations for both connectivity and endemism. Enacting such large-scale conservation measures would not only elevate the Salas y Gómez and Nazca ridges as an exemplary case study, providing lessons for other marine regions seeking to implement similar measures, but could also help raise awareness on the severity of externally originating threats like climate change and plastic pollution to global audiences.

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“…Fernández et al, 2014). Despite numerous studies have improved the understanding of the biodiversity and functioning of coastal ecosystems in the Juan Fernandez Archipelago (Friedlander et al, 2016;Pérez-Matus et al, 2014) and RN (Friedlander et al, 2013;Gusmao et al, 2018;Meerhoff et al, 2018;Wieters et al, 2014), there is no detailed information on cryptic fauna associated with these rocky and coral reef habitats, including both emergent macrobenthos and larval stages. Similarly, environmental sounds emitted by the reef and the potential effects of anthropogenic noise are completely unexplored in these isolated environments.…”

Section: Snaps From Snapping Shrimpmentioning

confidence: 99%

Exploring overlooked components of remote South‐east Pacific oceanic islands: Larval and macrobenthic assemblages in reef habitats with distinct underwater soundscapes

Carrasco

Bravo

Avilés

et al. 2020

Aquatic Conservation

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1. Identifying the diverse assemblage of species inhabiting rocky and coral reef habitats in isolated oceanic environments, and the important sound cues emitted from the reef, are crucial components to understand how species locate suitable habitats for the completion of their life-cycle and, thus, the functioning of these vulnerable ecosystems. 2. Recent field information suggests that the majority of reef biodiversity comprises small cryptic invertebrates; however, knowledge on these small components is extremely scarce. 3. The present study used light attraction methods to explore the diversity of larval, post-larval and macrobenthic cryptic fauna, and hydrophones to characterize the natural soundscape of rocky and coral reef habitats at the Robinson Crusoe island (Juan Fernandez Archipelago; 33 38 0 S, 78 50 0 W), and Rapa Nui (Easter Island; 27 7 0 S, 109 21 0 W), respectively. 4. Pelagic collections found important site-specific patterns and identified two main species assemblages: early-life stages (e.g. eggs, larval and juvenile stages of crustaceans, molluscs, and fishes) and emerging macrobenthos (e.g. demersal zooplankton such as peracarid crustaceans, ostracods, copepods, and polychaetes), with the latter contributing between 73 and 98% to the total catches. 5. The soundscape records showed marked differences among sites and seasons at Robinson Crusoe island, with variable differences found between day and night. However, at Rapa Nui, there were no differences between sites, but the ambient sound was higher at night possibly due to higher snapping shrimp activity. 6. This information highlights the importance of considering small-scale (site-to-site) patterns when evaluating overlooked components of diversity (i.e. biological or acoustic) in oceanic habitats, and provides the basis for understanding the importance of natural noise in the settlement of most reef-associated species, crucial features for the conservation of these remote and vulnerable ecosystems.

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Asymmetric connectivity of the lobster Panulirus pascuensis in remote islands of the southern Pacific: importance for its management and conservation

Cited by 13 publications

References 0 publications

Weak connectivity and population cohesiveness in rudderfish Kyphosus sandwicensis (Teleostei: Kyphosidae) inhabiting remote oceanic islands

Weak connectivity and population cohesiveness in rudderfish Kyphosus sandwicensis (Teleostei: Kyphosidae) inhabiting remote oceanic islands

Borderless conservation: Integrating connectivity into high seas conservation efforts for the Salas y Gómez and Nazca ridges

Exploring overlooked components of remote South‐east Pacific oceanic islands: Larval and macrobenthic assemblages in reef habitats with distinct underwater soundscapes

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