Genetics of Wild and Captive Lobster Populations

Kennington, W. Jason; Melville‐Smith, Roy; Berry, Oliver

doi:10.1002/9781118517444.ch2

Cited by 4 publications

(3 citation statements)

References 150 publications

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“…This incongruence is indicative of genetic patchiness. Similar trends in lack of global population differentiation but fine‐scale genetic heterogeneity have been reported in P. cygnus (Kennington, Berry, et al., ; Kennington, Melville‐Smith, et al., ). The authors hypothesized that even in a panmictic population, such as that of P. cygnus , genetic heterogeneity can arise from sweepstakes reproductive success (SRS) or presettlement mortality (Kennington, Berry, et al., ; Kennington, Melville‐Smith, et al., ).…”

Section: Discussionsupporting

confidence: 74%

“…In South Australia, Tasmania and New Zealand, a puerulus index based on puerulus catches in collectors is highly correlated to future commercial catches 3–7 years after settlement (Gardner et al., ; Linnane et al., ). High variability in year‐to‐year settlement abundance of J. edwardsii and the subsequent fluctuating commercial catch rates have been described and attributed not only to variation in adult reproductive output (Kennington, Melville‐Smith, & Berry, ), but to fluctuating environmental factors prior to settlement. Due to the wide geographic range of J. edwardsii , the strength of the environmental factors driving settlement abundance differs from region to region (Hinojosa et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Temporal genetic patterns of diversity and structure evidence chaotic genetic patchiness in a spiny lobster

et al. 2017

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Population structure of many marine organisms is spatially patchy and varies within and between years, a phenomenon defined as chaotic genetic patchiness. This results from the combination of planktonic larval dispersal and environmental stochasticity. Additionally, in species with bi-partite life, postsettlement selection can magnify these genetic differences. The high fecundity (up to 500,000 eggs annually) and protracted larval duration (12-24 months) and dispersal of the southern rock lobster, Jasus edwardsii, make it a good test species for chaotic genetic patchiness and selection during early benthic life. Here, we used double digest restriction site-associated DNA sequencing (ddRADseq) to investigate chaotic genetic patchiness and postsettlement selection in this species. We assessed differences in genetic structure and diversity of recently settled pueruli across four settlement years and between two sites in southeast Australia separated by approximately 1,000 km. Postsettlement selection was investigated by identifying loci under putative positive selection between recently settled pueruli and postpueruli and quantifying differences in the magnitude and strength of the selection at each year and site. Genetic differences within and among sites through time in neutral SNP markers indicated chaotic genetic patchiness. Recently settled puerulus at the southernmost site exhibited lower genetic diversity during years of low puerulus catches, further supporting this hypothesis. of spawning (Hendry, Berg, & Quinn, 1999), individual reproductive success (Hedgecock, 1994), pelagic larval duration (PLD) (Palumbi, 1994), larval behaviour (Raimondi & Keough, 1990) and natural selection (Cowen et al., 2000). Variability in the interaction of all those factors means that ephemeral fine-scale genetic heterogeneity or chaotic genetic patchiness could occur rather than the expected homogenous genetic diversity (Johnson & Black, 1982).Selective processes taking place before and after settlement can also lead to temporal genetic variation in the allele frequencies of a population (Johnson & Wernham, 1999). and 24 months in this phase before metamorphosing into a postlarva, known as puerulus (Booth, 1994). Phyllosoma experience up to 98% mortality during their protracted PLD (Lesser, 1978). This is not uncommon in marine invertebrates, and in the case of a sea urchin, although 2% of survivors were found to be sufficient to replenish a population, they carried a smaller representation of the overall genetic diversity of the adult population (Flowers, Schroeter, & Burton, 2002). Once pueruli settle, they remain sedentary and short distance migration is restricted to nocturnal foraging or retreating to protected areas during moulting (George, 2005). Settlement of J. edwardsii pueruli in southeastern Australia ishighest between the months of July and February and peaks during winter months (Gardner, Frusher, Kennedy, & Cawthorn, 2001).Puerulus settlement has been monitored in southeastern Australia for the past four d...

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Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Temporal genetic patterns of diversity and structure evidence chaotic genetic patchiness in a spiny lobster

et al. 2017

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“…A further consideration is that size at maturity (SAM) is known to vary spatially ( P . homarus : [ 74 ]) and with exploitation pressure [ 75 ]. However, enforcement of an inappropriate MLS may be both economically detrimental and of limited benefit in protecting the regional stock.…”

Section: Discussionmentioning

confidence: 99%

Short-term impacts and value of a periodic no take zone (NTZ) in a community-managed small-scale lobster fishery, Madagascar

Long

2017

PLoS ONE

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The small-scale lobster fisheries of Madagascar’s impoverished southeast coast account for the majority of national catch and export, making a significant contribution to the regional economy. Data suggests catches have declined, likely due to over-exploitation. In response, the community of Sainte Luce has established a locally managed marine area (LMMA) to manage their lobster fishery, including a 13 km2 periodic no take zone (NTZ). Participatory monitoring data were used to assess compliance, identify changes in catch per unit effort (CPUE) associated with the NTZ and consider the short-term value of the NTZ. Compliance is low for measures dictated by national legislation (minimum landing size (MLS), national closed season, prohibition on landing berried females), but may be higher for those designed by the community (NTZ). Upon NTZ opening in July 2015, an estimated 435% increase in catch was observed compared with the mean for the preceding five months, a product of increased effort and significantly higher CPUE. Zero Altered Negative Binomial modelling showed CPUE was significantly higher during the NTZ opening in 2015 and in 2016 when the opening period had been moved. Whilst it is unlikely that tangible ecological benefits have accrued from NTZ operation, there have been important socio-economic effects. Specifically, there was a 33% increase in the price fishers received, a significant effect at the bottom of the value chain. Temporary increases in catch and income acted as a catalyst, engaging neighbouring communities in fishery management, resulting in two additional NTZs. Attention is drawn to the fact that current national legislation may be sub-optimal and should be reviewed. Successful management of the regional fishery will require the state and industry to support communities in adopting community-based management. The NTZ measure considered here may be an effective tool to achieve this.

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Genetic structure and recent population expansion in the commercially harvested deep-sea decapod, Metanephrops challengeri (Crustacea: Decapoda)

Verry

Walton

Tuck

et al. 2020

New Zealand Journal of Marine and Freshwater Research

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Genetics of Wild and Captive Lobster Populations

Cited by 4 publications

References 150 publications

Temporal genetic patterns of diversity and structure evidence chaotic genetic patchiness in a spiny lobster

Temporal genetic patterns of diversity and structure evidence chaotic genetic patchiness in a spiny lobster

Short-term impacts and value of a periodic no take zone (NTZ) in a community-managed small-scale lobster fishery, Madagascar

Genetic structure and recent population expansion in the commercially harvested deep-sea decapod, Metanephrops challengeri (Crustacea: Decapoda)

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