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13 results for “Jasus edwardsii”
Data from: Disentangling genetic from environmental effects on phenotypic variability of Southern rock lobster (Jasus edwardsii) postlarvae
<p><span>Environmental conditions experienced during larval dispersal of marine organisms can determine size-at-settlement of recruits. It is, therefore, not uncommon that larvae undergoing different dispersal histories would exhibit phenotypic variability at recruitment. Here we investigated morphological differences in recently settled southern rock lobster (<em>Jasus</em> <em>edwardsii</em>) recruits, known as pueruli, along a latitudinal and temporal gradient on the east coast of Tasmania, Australia. We further explored whether natural selection could be driving morphological variation. We used double digest restriction-site associated DNA sequencing (ddRADseq) to assess differences in genetic structure of recently settled recruits on the east coast of Tasmania over three months of peak settlement during 2012 (August, September and October). Phenotypic differences in pueruli between sites and months of settlement were observed, with significantly smaller individuals found at the northernmost site. Also, there was a lack of overall genetic divergence; however, significant differences in pairwise FST values between settlement months were observed at the southernmost study site, located at an area of confluence of ocean currents. Specifically, individuals settling into the southernmost earlier in the season were genetically different from those settling later. The lack of overall genetic divergence in the presence of phenotypic variation indicates that larval environmental history during dispersal of <em>J</em>. <em>edwardsii</em> could be a possible driver of the resulting phenotype of settlers.</span></p>
Data from: Disentangling genetic from environmental effects on phenotypic variability of Southern rock lobster (Jasus edwardsii) postlarvae
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Data from: Investigation of genetic structure between deep and shallow populations of the southern rock lobster, Jasus edwardsii in Tasmania, Australia
The southern rock lobster, Jasus edwardsii, shows clear phenotypic differences between shallow water (red coloured) and deeper water (pale coloured) individuals. Translocations of individuals from deeper water to shallower waters are currently being trialled as a management strategy to facilitate a phenotypic change from lower value pale colouration, common in deeper waters, to the higher value red colouration found in shallow waters. Although panmixia across the J. edwardsii range has been long assumed, it is critical to assess the genetic variability of the species to ensure that the level of population connectivity is appropriately understood and translocations do not have unintended consequences. Eight microsatellite loci were used to investigate genetic differentiation between six sites (three shallow, three deep) across southern Tasmania, Australia, and one from New Zealand. Based on analyses the assumption of panmixia was rejected, revealing small levels of genetic differentiation across southern Tasmania, significant levels of differentiation between Tasmania and New Zealand, and high levels of asymmetric gene flow in an easterly direction from Tasmania into New Zealand. These results suggest that translocation among Tasmanian populations are not likely to be problematic, however, a re-consideration of panmictic stock structure for this species is necessary.
Data from: Outlier SNPs enable food traceability of the southern rock lobster, Jasus edwardsii
Recent advances in next-generation sequencing have enhanced the resolution of population genetic studies of non-model organisms through increased marker generation and sample throughput. Using double digest restriction site-associated DNA sequencing (ddRADseq), we investigated the population structure of the commercially important southern rock lobster, Jasus edwardsii, in Australia and New Zealand with the aim of identifying a panel of SNP markers that could be used to trace country of origin. Four ddRADseq libraries comprising a total of 88 individuals were sequenced on the Illumina MiSeq platform, and demultiplexed reads were used to create a reference catalog of loci. Individual reads were then mapped to the reference catalog, and variant calling was performed. We have characterized two single-nucleotide polymorphism (SNP) panels comprised in total of 656 SNPs. The first panel contained 535 neutral SNPs and the second, 121 outlier SNPs that were characteristic of being putatively under selection. Both neutral and outlier SNP panels showed significant differentiation between the two countries, with the outlier loci demonstrating much larger FST values (FST outlier SNP panel = 0.134, P < 0.0001; FST neutral SNP panel = 0.022, P < 0.0001). Assignment tests performed with the outlier SNP panel allocated 100 % of the individuals to country of origin, demonstrating the usefulness of these markers for food traceability of J. edwardsii.
Figure 3 in Trophic discrimination factors and stable isotope variability in a captive feeding trial of the southern rock lobster Jasus edwardsii (Hutton, 1875) (Decapoda: Palinuridae) in Tasmania, Australia
Figure 3. Isoplot showing the fit of different trophic discrimination factors (TDFs) to a wild population of Jasus edwardsii (■) and associated wild prey sources: Haliotis rubra (▲), Heliocidaris erythrogramma (■), and Lunella undulata (●), demonstrating that our experimentally derived TDFs provide the best fit. Black dots represent the isotope signatures of individual dorsal-muscle samples of lobsters. Mean and standard deviation values refer to the three source signatures with no TDF correction, with correction using multi-taxa TDFs from the literature (∆13C 0.4‰ and ∆15N 3.4‰ (Post, 2002)) and previously determined TDFs for J. edwardsii (∆13C 0.84‰ and ∆15N 3.28‰ (Suring & Wing, 2009)), with correction using our experimentally determined dorsal muscle TDFs (∆13C 4.45‰ and ∆15N 4.36‰), and correction with our experimentally determined leg muscle TDFs (∆13C 3.86‰ and ∆15N 5.05‰).
Figure 1 in Trophic discrimination factors and stable isotope variability in a captive feeding trial of the southern rock lobster Jasus edwardsii (Hutton, 1875) (Decapoda: Palinuridae) in Tasmania, Australia
Figure 1. Correlation plots showing the relationship between samples of captive Jasus edwardsii leg muscle and dorsal muscle (N = 34) for δ13C (A) and δ15N (B).
Figure 2 in Trophic discrimination factors and stable isotope variability in a captive feeding trial of the southern rock lobster Jasus edwardsii (Hutton, 1875) (Decapoda: Palinuridae) in Tasmania, Australia
Figure 2. Change in mean (± SE) isotopic signatures over time for captive Jasus edwardsii in three diet treatments: sea urchin (●), fish (▲), and mussel (■). Plots show change in δ13C (A) and change in δ15N (B). Solid lines represent lobster muscle tissue as represented by a leg-muscle icon, and dashed lines represent lobster exoskeleton as represented by a red-leg exoskeleton icon. Dotted lines represent the mean diet isotope + trophic discrimination factor (TDF) calculated as of 12 months. All mean values have a minimum sample size of five replicates except for the following samples: 4-month mussel (N = 4), 18-month fish (N = 4), and 18-month mussel (N = 3). For lethal samples (initial, 12, and 18 monts), exoskeleton samples are the mean of leg and dorsal samples where both were collected. Exoskeleton samples are only leg samples for non-lethal samples.
Data from: Outlier SNPs enable food traceability of the southern rock lobster, Jasus edwardsii
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Data from: Investigation of genetic structure between deep and shallow populations of the southern rock lobster, Jasus edwardsii in Tasmania, Australia
Open the record for dataset details and reuse information.
Figure 13 from: Carter CG, Westbury H, Crear B, Simon C, Thomas C (2014) Agonistic behaviour in juvenile southern rock lobster, Jasus edwardsii (Decapoda, Palinuridae): implications for developing aquaculture. In: Wehrtmann IS, Bauer RT (Eds) Proceedings of the Summer Meeting of the Crustacean Society and the Latin American Association of Carcinology, Costa Rica, July 2013. ZooKeys 457: 323-337. https://doi.org/10.3897/zookeys.457.6760
Figure 13 - Occurrence of Jasus edwardsii behavioural groups as a) mean (± SE) individual occurrence (occ. h-1) and b) mean (± SE) group occurrence per individual per hour (occ. ind-1 h-1). Individual occurrence (a): significant difference amongst behavioural groups (N = 20, P < 0.001, Kruskal-Wallis Test). Group occurrence (b): significant difference amongst behavioural groups (n = 4, P < 0.001, Kruskal-Wallis Test). No significant different amongst means with same letter.
Figures 5-8 from: Carter CG, Westbury H, Crear B, Simon C, Thomas C (2014) Agonistic behaviour in juvenile southern rock lobster, Jasus edwardsii (Decapoda, Palinuridae): implications for developing aquaculture. In: Wehrtmann IS, Bauer RT (Eds) Proceedings of the Summer Meeting of the Crustacean Society and the Latin American Association of Carcinology, Costa Rica, July 2013. ZooKeys 457: 323-337. https://doi.org/10.3897/zookeys.457.6760
Figures 5-8 - Selected avoidance behaviours of Jasus edwardsii: 5 back away 6 walk away 7 side step away 8 flee.
Figures 1-4 from: Carter CG, Westbury H, Crear B, Simon C, Thomas C (2014) Agonistic behaviour in juvenile southern rock lobster, Jasus edwardsii (Decapoda, Palinuridae): implications for developing aquaculture. In: Wehrtmann IS, Bauer RT (Eds) Proceedings of the Summer Meeting of the Crustacean Society and the Latin American Association of Carcinology, Costa Rica, July 2013. ZooKeys 457: 323-337. https://doi.org/10.3897/zookeys.457.6760
Figures 1-4 - Selected aggressive behaviours of Jasus edwardsii: 1 attack 1 (low intensity) 2 clasp 3 rise 1 (low intensity) 4 rise 3 (high intensity).
Figures 9-12 from: Carter CG, Westbury H, Crear B, Simon C, Thomas C (2014) Agonistic behaviour in juvenile southern rock lobster, Jasus edwardsii (Decapoda, Palinuridae): implications for developing aquaculture. In: Wehrtmann IS, Bauer RT (Eds) Proceedings of the Summer Meeting of the Crustacean Society and the Latin American Association of Carcinology, Costa Rica, July 2013. ZooKeys 457: 323-337. https://doi.org/10.3897/zookeys.457.6760
Figures 9-12 - Selected other behaviours of Jasus edwardsii: 9 cautious approach, 10 approach forward 11 anntennae touch 12 antennule touch.
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