Molecular and morphological analyses of the cuttlefish Sepia apama indicate a complex population structure

Kassahn, Karin S.; Donnellan, Stephen C.; Fowler, Anthony J.; Hall, Karina C.; Adams, Mark A.; Shaw, Paul W.

doi:10.1007/s00227-003-1141-5

Cited by 53 publications

(56 citation statements)

References 61 publications

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“…However, large-scale genetic homogeneity, indicating high levels of interbreeding and gene flow, cannot always be assumed for cephalopods. For example, in several species of cuttlefish, which are highly mobile as adults but less mobile at the benthic paralarval stage, continuously distributed populations display significant genetic structuring, which fits the expectations of an isolation-by-distance model of restricted gene flow (Perez Losada et al 2002, Kassahn et al 2003. Nevertheless, our results extend the picture of squid species displaying genetically homogeneous populations over large geographical scales, unless specific oceanographic features create a barrier to gene flow (e.g.…”

Section: Discussionsupporting

confidence: 78%

Discrete spawning aggregations of loliginid squid do not represent genetically distinct populations

Shaw

Hendrickson²,

McKeown³

et al. 2010

Mar. Ecol. Prog. Ser.

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Establishing whether heavily fished spawning aggregations of squid represent genetically distinct populations is important for fisheries management, especially in light of recent efforts to apply ecosystem-based management methods and the importance of squid as both predator and prey. Most squid species have the potential for high dispersal rates due to lengthy planktonic paralarval stages and highly migratory adult stages. Such life-history traits lead to predictions of genetic homogeneity (i.e. panmixia) of squid populations across large geographical areas. However, testing this hypothesis can be difficult, because spawning populations of squid are highly mobile and spawning sites are either unknown or spread sparsely over large geographical areas. Loligo reynaudii and Doryteuthis (Amerigo) pealeii are 2 squid species that are commercially fished on inshore spawning grounds located off the coasts of South Africa and the eastern USA, respectively, and for which highly localised spawning aggregations have been documented. We sampled discrete spawning aggregations of these 2 neritic species, so that the highest likelihood of sampling true reproductive populations was achieved, in order to determine whether such spawning aggregations represent discrete genetic populations. As has been reported for many squid species, the levels of genetic diversity detected at nuclear microsatellite DNA loci, within both L. reynaudii and D. pealeii, were high and consistent across all samples. Our results for D. pealeii indicated that adjustments of allele frequencies using MICROCHECKER to take the presence of null alleles into account may introduce bias, due to the presence of loci with small numbers of common alleles; this leads to a conclusion that there is significant genetic differentiation among populations where none exists. For both species, our results indicated no significant genetic differentiation of populations and, thus, no association of spawning aggregations with distinct genetic subpopulations, across the main spawning ranges sampled.KEY WORDS: Loligo sp. · Doryteuthis sp. · Squid population genetics · Spawning aggregations · Panmixia · Microsatellite DNA · MICROCHECKER · Null alleles Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 408: 117-127, 2010117-127, et al. 2005117-127, , crabs: Sotelo et al. 2008 have demonstrated that the dispersal and interbreeding realised is often much lower than the levels predicted from life-history characteristics (Palumbi 2004). Although the degree of genetic structuring of marine species is usually much lower than that reported for freshwater or terrestrial species, the biological significance of low levels of genetic structure has been supported by correlation of population differentiation with environmental factors (Bekkevold et al. 2005) or by temporal and spatial replication (Cimmaruta et al. 2008). Understanding genetic substructuring of marine species is important for understanding how populations evolve, for ex...

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Section: Discussionsupporting

confidence: 78%

Discrete spawning aggregations of loliginid squid do not represent genetically distinct populations

Shaw

Hendrickson²,

McKeown³

et al. 2010

Mar. Ecol. Prog. Ser.

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“…Multivariate analysis of a set of morphometric and meristic characters has been widely used in stock identification of freshwater and marine fish species (Mamuris et al, 1998;Cadrin, 2000;Murta, 2000;Pakkasmaa & Piironen, 2001;Cabral et al, 2003), and to a lesser extent in marine invertebrates (e.g., Henderson et al, 1990;Kassahn et al, 2003). This method is also regarded as more appropriate than the use of single morphological characters for investigating taxonomic problems in determining relationships between populations or closely related (cryptic) species (e.g., Scapini et al, 1999;Clark et al, 2001;De Grave & Diaz, 2001;Debuse et al, 2001;Doadrio et al, 2002;Lee & Frost, 2002).…”

Section: Introductionmentioning

confidence: 99%

Morphological Differentiation Between Geographically Separated Populations of Neomysis integer and Mesopodopsis slabberi (Crustacea, Mysida)

2005

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Morphological variation was examined in Neomysis integer and Mesopodopsis slabberi, two abundant, low dispersal mysid species (Crustacea, Mysida) along the European coasts. Both species dominate the hyperbenthic communities in the northeast Atlantic, and M. slabberi is also widely distributed in the Mediterranean and Black Sea. Three populations of these species were sampled throughout their distribution range; samples of N. integer were collected in the northeast Atlantic Eems-Dollard, Gironde and Guadalquivir estuaries; in the case of M. slabberi, mysids were sampled in two northeast Atlantic estuaries (Eems-Dollard and Guadalquivir) and one Mediterranean site (Ebro Delta). A total of 12 morphometric and 2 meristic characters were measured from 30-64 mysids per sample. Multivariate analysis showed clear morphometric differences between populations of both species. The morphological differentiation within M. slabberi was highly concordant with the available genetic data from mitochondrial loci, pointing to a large divergence between the Atlantic and Mediterranean populations. However, due to some overlap of individuals between the different populations, the present morphometric analysis does not suffice to assign the different populations to a separate (sub)species status. In the case of N. integer, the morphometric patterns showed a divergence of the Gironde population. Differentiation of populations within this mysid, as in M. slabberi, were mainly related to eye and telson morphology. Potential interactions of the mysid morphology and environmental conditions are discussed.

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“…It would also be useful to conduct a similar study using a different technique, such as molecular markers, as a multi-technique approach to understanding such aspects of marine populations has been shown to provide both corroborative and complementary results (e.g. Kassahn et al 2003, Miller et al 2005. Our results will help determine the appropriate sustainable scale at which the O. maorum fishery ought to be managed.…”

Section: Discussionmentioning

confidence: 99%

Using stylet elemental signatures to determine the population structure of Octopus maorum

Doubleday¹,

Pecl²,

Semmens³

et al. 2008

Mar. Ecol. Prog. Ser.

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A novel method was used to investigate the population structure and dispersal patterns of Octopus maorum, an octopus species with a planktonic larval stage, which forms a distinct and large aggregation in southeast Tasmania. Single and multi-elemental signatures within the 'early life history' region of the stylet (an internal 'shell') were used to determine levels of connectivity and the common origins of individuals collected from 5 locations across Tasmania, South Australia and New Zealand. Using laser ablation inductively coupled plasma-mass spectrometry (LA ICPMS) the stylets were analysed for 12 elements, 8 of which were found to be excellent spatial discriminators. There was evidence of population structuring within the O. maorum population, with a distinct separation of the aggregation site in southeast Tasmania from other groups. Octopuses from the aggregation shared a common origin and appeared to be coming from a local neighbouring source. The 2 northern sample locations shared a similar elemental signature, which could be due to either similar water chemistries or long-distance dispersal. This study presents the first insights into the population structure of O. maorum, and provides vital information for the sustainable management of this species. Furthermore, this technique will have direct application to other more heavily fished octopus species around the world.

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Molecular and morphological analyses of the cuttlefish Sepia apama indicate a complex population structure

Cited by 53 publications

References 61 publications

Discrete spawning aggregations of loliginid squid do not represent genetically distinct populations

Discrete spawning aggregations of loliginid squid do not represent genetically distinct populations

Morphological Differentiation Between Geographically Separated Populations of Neomysis integer and Mesopodopsis slabberi (Crustacea, Mysida)

Using stylet elemental signatures to determine the population structure of Octopus maorum

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