Incipient speciation within a subgenus of rockfish (Sebastosomus) provides evidence of recent radiations within an ancient species flock

Burford, Martha O.; Bernardi, Giacomo

doi:10.1007/s00227-008-0963-6

Cited by 34 publications

(47 citation statements)

References 48 publications

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“…This suggests strongly that there is minimal exchange of individuals and little hope that one population could repopulate the other. Recent results confirm the lack of exchange between the two groups, and further indicate the two groups are actually cryptic species (Burford and Larson 2007;Burford and Bernardi 2008).…”

Section: Influence Of Oceanographic Featuresmentioning

confidence: 56%

“…Evidence of incipient speciation in blue rockfish (S. mystinus) has been shown using both mtDNA sequences and microsatellite information (Burford and Bernardi 2008). A greater level of divergence was found between the two types of blue rockfish than has been reported between the sister species gopher rockfish (S. carnatus) and black and yellow rockfish (S. chrysomelas) (Narum et al 2004).…”

Section: Species Identificationmentioning

confidence: 97%

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The utility and limitations of genetic data for stock identification and management of North Pacific rockfish (Sebastes spp.)

Berntson

Moran

2008

Rev Fish Biol Fisheries

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Rockfishes (Sebastes spp.) represent a speciose and ecologically important group of marine fishes found in both the Pacific and Atlantic oceans, with approximately 105 species found world-wide (Hyde and Vetter 2007). They also comprise the majority of species found in the Pacific groundfish fishery. Thorough species assessments in terms of harvest management have been done for only 11 species, and of the 11 species, seven have been declared overfished. Having accurate genetic information is critical to the continuing effort at stock assessments, but sampling is often difficult in marine fishes. Genetic techniques are a powerful tool in the effort to better characterize the ecology of these species. These techniques can be used to investigate multiple biological traits, including species identity, intra-and interspecific genetic variation, migration patterns, and effective population size. There are important caveats and limitations when applying specific genetic methods, especially in marine species that lack discrete spawning aggregates. Nevertheless, it is clear from a review of recent literature that genetic tools have already provided very specific insight regarding rockfish population dynamics. The results are diverse and difficult to synthesize; however, existing studies show five primary patterns to population groupings in rockfishes: no obvious pattern of structure, structure consistent with isolation by distance, structure evident but inconsistent with isolation by distance, structure that correlates to oceanographic features, and potential genetic introgression. Clearly the study of rockfish population genetics is poised for rapid expansion that will unquestionably aid management of the rockfish fisheries and general understanding of rockfish evolutionary systematics. A principle challenge at this point is to derive generalized inferences from such a diverse array of study results across the vast North Pacific range of Sebastes. This review summarizes existing genetic studies in Sebastes spp. in the North Pacific to assist in identifying knowledge gaps for this ecologically important and diverse group.

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Section: Influence Of Oceanographic Featuresmentioning

confidence: 56%

Section: Species Identificationmentioning

confidence: 97%

The utility and limitations of genetic data for stock identification and management of North Pacific rockfish (Sebastes spp.)

Berntson

Moran

2008

Rev Fish Biol Fisheries

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“…From the extracted genomic DNA, we amplified 6 micro satellite loci de signed from Sebastes rastrelliger , GenBank Accession numbers: AF269054-57, AF269059, AF 269061, respectively; Buonaccorsi et al 2004, Westerman et al 2005, using polymerase chain reaction (PCR). We followed the protocol outlined in Burford & Lar son (2007) and Burford & Bernardi (2008) for fragment amplification and scoring of these 6 microsatellite loci. In total, we analyzed 760 individuals from 9 locations for the 2001 year-class and 1478 individuals from 13 locations for the 2002 year-class ( Fig.…”

Section: Dna Extraction and Amplificationmentioning

confidence: 99%

“…We ran all juveniles from both year-classes and all adults together and generated posterior probabilities in STRUCTURE using 100 000 iterations of the Markov chain Monte Carlo (MCMC) method after an initial burn-in period of 40 000 iterations. We averaged the posterior probabilities for each individual over the 5 runs and, in contrast to previous analyses (Burford & Bernardi 2008, Burford 2009), we assigned individuals with a posterior probability as signment of 0.75 or greater to one of the 2 species (following Burford et al 2011). We verified K and the stability of other model parameters by running the model with 5 replicates and ΔK-values ranging from 1 to 5 and analyzing the log-likelihood, the data estimate [ln(Pr(X/K))], and variance structure of the estimated log (natural) probability for different Ks (Appendix 2).…”

Section: Individual Assignment and Geographic Cluster Analysismentioning

confidence: 99%

“…However, there is evidence of recent cryptic speciation within S. mystinus (mean ± SD: 520 ± 115 kyr; Burford 2009) across its geographic range (southern California to northern Washington). The 2 species were reproductively isolated and have a north-south distribution pattern, with a northerly and southerly distributed Type 1 and Type 2 species, respectively (Burford & Bernardi 2008, Burford 2009, and a range of overlap from central/ southern Oregon to northern California (~450 km; Burford 2009). In an analysis of hybridization of settling S. mystinus juveniles, there was little or no evidence of first generation hybrids, suggesting that reproductive isolation between the 2 species in regions where both coexist was due to pre-zygotic barriers (Burford et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Age-structured genetic analysis reveals temporal and geographic variation within and between two cryptic rockfish species

Burford

Carr²,

Bernardi³

2011

Mar. Ecol. Prog. Ser.

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The spatial patterns of genetic structure among juveniles of long-lived species can reveal the extent of interannual and geographic variation in realized larval dispersal as well as the processes that determine ecologically relevant patterns of population connectivity. However, few studies examine this temporal and spatial variation over large portions of a species' geographic range or between cryptic species that overlap in their range. Despite the potential for long-distance dispersal in blue rockfish Sebastes mystinus, a previous study of adults revealed two geographically distinct, cryptic species. To determine year-to-year variation in the patterns of spatial connectivity and to elucidate the potential ecological mechanisms involved in shaping new yearclasses and maintaining cryptic species, we sampled juveniles within California, USA, where both cryptic species coexist. Using microsatellite markers, we found geographic and temporal variation in the number of individuals from these distinct cryptic species within 2 new year-classes of juvenile S. mystinus. We also found differences in the geographic patterns of genetic structure of the 2 cryptic species. Whereas one species exhibited little or no spatial genetic structure across the study region, the other exhibited a complex geographic pattern of genetic structure, with little or no genetic structure among regions, but small-scale structure within a region. The results of this study demonstrate that the spatial scales and patterns of realized dispersal of pelagic larvae vary geographically, interannually, and between closely related species with similar life-history strategies. Therefore, estimates of dispersal based on larval duration and patterns of adult structure need to be interpreted cautiously.

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Functional endemism: population connectivity, shifting baselines, and the scale of human experience

Drew

Kaufman

2012

Ecology and Evolution

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Quantifying population connectivity is important for visualizing the spatial and temporal scales that conservation measures act upon. Traditionally, migration based on genetic data has been reported in migrants per generation. However, the temporal scales over which this migration may occur do not necessarily accommodate the scales over which human perturbations occur, leaving the potential for a disconnect between population genetic data and conservation action based on those data. Here, we present a new metric called the “Rule of Memory”, which helps conservation practitioners to interpret “migrants per generation” in the context both of human modified ecosystems and the cultural memory of those doing the modification. Our rule states that clades should be considered functionally endemic regardless of their actual taxonomic designation if the migration between locations is insufficient to maintain a viable population over the timescales of one human generation (20 years). Since larger animals are more likely to be remembered, we quantify the relationship between migrants per human (N) and body mass of the organism in question (M) with the formula N = 10M−1. We then use the coral reef fish Pomacentrus moluccensis to demonstrate the taxonomic and spatial scales over which this rule can be applied. Going beyond minimum viable population literature, this metric assesses the probability that a clade's existence will be forgotten by people throughout its range during a period of extirpation. Because conservation plans are predicated on having well-established baselines, a loss of a species over the range of one human generation evokes the likelihood of that species no longer being recognized as a member of an ecosystem, and thus being excluded in restoration or conservation prioritization. [Correction added on 26 December 2012, after first online publication: this formula has been corrected to N=10M−1].

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Incipient speciation within a subgenus of rockfish (Sebastosomus) provides evidence of recent radiations within an ancient species flock

Cited by 34 publications

References 48 publications

The utility and limitations of genetic data for stock identification and management of North Pacific rockfish (Sebastes spp.)

The utility and limitations of genetic data for stock identification and management of North Pacific rockfish (Sebastes spp.)

Age-structured genetic analysis reveals temporal and geographic variation within and between two cryptic rockfish species

Functional endemism: population connectivity, shifting baselines, and the scale of human experience

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