Strong genetic but not spatial subdivision of two reef fish species targeted by fishers on the Great Barrier Reef

Evans, Richard D.; Herwerden, Lynne van; Russ, Garry R.; Frisch, Ashley J.

doi:10.1016/j.fishres.2009.10.002

Cited by 28 publications

(41 citation statements)

References 61 publications

(90 reference statements)

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“…A recent genetic study using the mitochondrial HVR I control region from the GBR L. carponotatus, demonstrated that there was significant gene flow within and among four inshore island groups (Evans et al, 2010). Although phylogenetic and population genetic analyses showed no geographic partitioning, two distinct lineages were identified and were represented across all sampling locations.…”

Section: Introductionmentioning

confidence: 96%

“…Genetic data obtained for GBR L. carponotatus by Evans et al (2010) is used for direct comparison of the L. carponotatus population across Australia. Given the long pelagic larval duration for L. capronotatus (34 days [Evans unpublished data]), we test two hypotheses: firstly, that the population occupying three regions within WA will lack spatial genetic structuring, as seen in the GBR population (Evans et al, 2010) and, secondly, that the WA and GBR populations are genetically differentiated. We also evaluate and compare the genetic variability of the WA population(s) to that of the GBR.…”

Section: Introductionmentioning

confidence: 99%

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Strong genetic subdivision generates high genetic variability among eastern and western Australian populations of Lutjanus carponotatus (Richardson)

et al. 2011

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Strong genetic subdivision generates high genetic variability among eastern and western Australian populations of Lutjanus carponotatus (Richardson)

et al. 2011

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“…Moreover, the results indicate that the gene flow in the study region may not be related to geographical distances; certain locations showed limited connectivity with their surroundings, whereas other locations showed long distance genetic exchange, as suggested for other fish species (Evans et al, 2010;Villegas Sánchez et al, 2014). In this context, reduced levels of genetic differentiation may be promoted in marine organisms with large effective population sizes complemented with high levels of population admixture of distinct genotypes among locations; however, both conditions could contribute favouring subtle but complex genetic structures, depending on the balance between current-mediated larval dispersal and adult active homing behaviour over small and large geographic scales (Baeza and Fuentes, 2013;Lemer and Planes, 2014;VergaraChen et al, 2014).…”

Section: Discussionmentioning

confidence: 65%

Spatial genetic structure in the saddled sea bream (Oblada melanura [Linnaeus, 1758]) suggests multi-scaled patterns of connectivity between protected and unprotected areas in the Western Mediterranean Sea

et al. 2016

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Spatial genetic structure in the saddled sea bream (Oblada melanura [Linnaeus, 1758] a b s t r a c tMarine protected areas (MPAs) and networks of MPAs are advocated worldwide for the achievement of marine conservation objectives. Although the knowledge about population connectivity is considered fundamental for the optimal design of MPAs and networks, the amount of information available for the Mediterranean Sea is currently scarce. We investigated the genetic structure of the saddled sea bream (Oblada melanura) and the level of genetic connectivity between protected and unprotected locations, using a set of 11 microsatellite loci. Spatial patterns of population differentiation were assessed locally (50-100 km) and regionally (500-1000 km), considering three MPAs of the Western Mediterranean Sea. All values of genetic differentiation between locations (Fst and Jost's D) were non-significant after Bonferroni correction, indicating that, at a relatively small spatial scale, protected locations were in general well connected with non-protected ones. On the other hand, at the regional scale, discriminant analysis of principal components revealed the presence of a subtle pattern of genetic heterogeneity that reflects the geography and the main oceanographic features (currents and barriers) of the study area. This genetic pattern could be a consequence of different processes acting at different spatial and temporal scales among which the presence of admixed populations, large population sizes and species dispersal capacity, could play a major role. These outcomes can have important implications for the conservation biology and fishery management of the saddled sea bream and provide useful information for genetic population studies of other coastal fishes in the Western Mediterranean Sea.

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“…The apparent discrepancy between mtDNA and msatDNA likely results from few recruits per generation maintaining mtDNA genetic homogeneity over historical timescales, whereas populations at isolated locations require substantial amounts of self-recruitment on contemporary timescales to maintain viable populations. This discrepancy between mtDNA and msatDNA is increasingly being documented in other coral reef fishes (e.g., Evans et al 2010;Harrison et al 2012) and within the LHI region (van der Meer et al 2012a(van der Meer et al , b, 2013a. Interestingly, some individuals at the peripheral location (NI) show phenotypic differences (stripes and patterns around the eye, authors pers obs) suggesting that NI is at the very least, a genetically distinct and unique subpopulation (Drew et al 2008) or at an early stage of peripheral speciation (sensu Rocha 2004;Bowen et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Population connectivity and the effectiveness of marine protected areas to protect vulnerable, exploited and endemic coral reef fishes at an endemic hotspot

et al. 2014

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Marine protected areas (MPAs) aim to mitigate anthropogenic impacts by conserving biodiversity and preventing overfishing. The effectiveness of MPAs depends on population connectivity patterns between protected and nonprotected areas. Remote islands are endemism hotspots for coral reef fishes and provide rare examples of coral reefs with limited fishing pressure. This study explored population genetic connectivity across a network of protected and non-protected areas for the endemic wrasse, Coris bulbifrons, which is listed as ''vulnerable'' by the IUCN due to its small, decreasing geographic range and declining abundance. Mitochondrial DNA (mtDNA) and microsatellite DNA (msatDNA) markers were used to estimate historic and contemporary gene flow to determine the level of population self-replenishment and to measure genetic and genotypic diversity among all four locations in the species range (south-west Pacific Ocean)-Middleton Reef (MR), Elizabeth Reef (ER), Lord Howe Island (LHI) and Norfolk Island (NI). MPAs exist at MR and LHI and are limited or nonexistent at ER and NI, respectively. There was no obvious differentiation in mtDNA among locations, however, msatDNA revealed differentiation between the most peripheral (NI) and all remaining locations (MR, ER and LHI). Despite high mtDNA connectivity (M = 259-1,144), msatDNA connectivity was limited (M = 3-9) with high self-replenishment (68-93 %) at all locations. NI is the least connected and heavily reliant on self-replenishment, and the absence of MPAs at NI needs to be rectified to ensure the persistence of endemic species at this location. Other endemic fishes exhibit similar patterns of high self-replenishment across the four locations, indicating that a single spatial management approach consisting of a MPA network protecting part of each location could provide reasonable protection for these species. Thus, the existing network of MPAs at this endemic hotspot appears adequate at some locations, but not at all.

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Strong genetic but not spatial subdivision of two reef fish species targeted by fishers on the Great Barrier Reef

Cited by 28 publications

References 61 publications

Strong genetic subdivision generates high genetic variability among eastern and western Australian populations of Lutjanus carponotatus (Richardson)

Strong genetic subdivision generates high genetic variability among eastern and western Australian populations of Lutjanus carponotatus (Richardson)

Spatial genetic structure in the saddled sea bream (Oblada melanura [Linnaeus, 1758]) suggests multi-scaled patterns of connectivity between protected and unprotected areas in the Western Mediterranean Sea

Population connectivity and the effectiveness of marine protected areas to protect vulnerable, exploited and endemic coral reef fishes at an endemic hotspot

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