Calculation of the Intrinsic Rate of Natural Increase, rm, With Rhabditis Marina Bastian 1865 (Nematoda)

Vranken, G.; Heip, C.H.R.

doi:10.1163/187529283x00348

Cited by 40 publications

(27 citation statements)

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“…through 'rafting') than typically endobenthic nematodes. Its high reproductive capacity (up to 600 eggs female -1 under optimal conditions; Vranken & Heip 1983) and short generation time (< 3 d under optimal conditions; Vranken & Heip 1983, Moens & Vincx 2000a) render this species a strong colonizer capable of establishing viable populations from 1 or a few gravid females. In view of these features, we expected some capacity for passive dispersal and gene flow, at least over limited geographical distances.…”

Section: Introductionmentioning

confidence: 99%

Mitochondrial DNA variation and cryptic speciation within the free-living marine nematode Pellioditis marina

Derycke

Remerie²,

Vierstraete³

et al. 2005

Mar. Ecol. Prog. Ser.

217

183

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An inverse correlation between dispersal ability and genetic differentiation among populations of a species is frequently observed in the marine environment. We investigated the population genetic structure of the free-living marine nematode Pellioditis marina. A total of 426 bp of the mitochondrial cytochrome oxidase subunit 1 (COI) gene were surveyed on a geographical scale of approximately 100 km during spring 2003. Nematodes were collected from 2 coastal locations in Belgium, and from 2 estuaries and a saltwater lake (Lake Grevelingen) in The Netherlands. Molecular variation was assessed with the single-strand conformation polymorphism (SSCP) method. In total, 32 different haplotypes were observed, and sequence divergence among 452 individuals ranged from 0.2 to 10.6%. We discovered 4 distinct mitochondrial lineages, with low divergences within the lineages (0.2 to 1.6%) and high divergences between the lineages (5.1 to 10.6%). The nuclear ribosomal ITS (internal transcribed spacer) region showed concordant phylogenetic patterns, suggesting that nematode species diversity may be considerably underestimated. Analysis of molecular variance (AMOVA) indicated a strong genetic differentiation among populations. The Lake Grevelingen population was clearly differentiated from all other populations, but genetic structuring was also significant within the Westerschelde and was correlated with gradients in salinity and pollution. The observed population genetic structure is in accordance with the limited active dispersal capacity of P. marina, but is at variance with its significant potential for passive dispersal. We therefore suggest that autecological characteristics, including short generation time, high colonization potential and local adaptation, may be at the basis of this nematode's population genetic structure.KEY WORDS: Pellioditis marina · Single-strand conformation polymorphism · Cryptic species · Population genetic structure Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 300: [91][92][93][94][95][96][97][98][99][100][101][102][103] 2005 influencing gene flow in marine species are roughly divided into physical (e.g. ocean currents, habitat characteristics) and biological (e.g. spawning season, predation, larval and adult behavior) categories (Hohenlohe 2004). These characteristics limit the dispersal abilities of planktonic larvae, and render marine environments less open than previously thought. Furthermore, the issue of spatial scale may further complicate the discussion about open versus closed marine populations (Cowen et al. 2000, Camus & Lima 2002.In addition, population genetic surveys have also revealed that many marine 'species' are in fact species complexes involving morphologically cryptic taxa (Knowlton 1993, Todaro et al. 1996, Bond & Sierwald 2002, Mathews et al. 2002, McGovern & Hellberg 2003. Such complexes are especially prominent in small invertebrates with few taxonomically diagnostic characters (Rocha-Olivares et al. 2001). T...

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Section: Introductionmentioning

confidence: 99%

Mitochondrial DNA variation and cryptic speciation within the free-living marine nematode Pellioditis marina

Derycke

Remerie²,

Vierstraete³

et al. 2005

Mar. Ecol. Prog. Ser.

217

183

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“…Importantly, meiobiotal species also differ markedly in size (44 mm-1 mm [3,4]), consequent reproductive rate (e.g. between 1 and 55 generations per year in nematodes [15]) and carrying capacities are strongly affected by nutrient inputs [16]. Furthermore, interstitial taxa are notoriously patchy and often possess life histories lacking a dispersal phase [16].…”

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A critique of Rossberg et al. : noise obscures the genetic signal of meiobiotal ecospecies in ecogenomic datasets

et al. 2014

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“…These eggs develop into adults within two weeks. The rhabditid Pellioditis marina has an even higher reproductive potential, producing over 600 eggs per female which mature in less than five days (Vranken & Heip, 1983).…”

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confidence: 99%

A re-evaluation of marine nematode productivity

et al. 1986

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Nematodes are the most abundant multicellular animals in marine sediments but their role in the benthos has not been properly quantified yet. In nearly all energy-flow budgets of marine systems their annual production P is given as about nine times their mean biomass B and their part in the total energy-flow is consequently estimated as anywhere between 3 and 30% of the total (carbon) input in the benthic system. Our laboratory experiments demonstrate that nematode productivity is much higher than P/B -9 per year and may reach values of over 60 for bacterial grazers. To obtain more reliable estimates for field populations we propose a regression equation relating egg-to-egg development time Tmin to temperature (t) and adult female weight (W in pg wet weight):log Tmin =2.202-0.0461 t + 0.627 log W. When multiplied by the constant biomass turnover per generation (P/B),,, =3, development rate l/'T,i, is a good predictor of daily P/B. This method was applied to two series of field data. A rather stable community from a sublittoral mud in the North Sea had an annual P/B = 20. A less stable Aufwuchs community from Sargassum in Japan had an annual P/B = 58.

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Calculation of the Intrinsic Rate of Natural Increase, rm, With Rhabditis Marina Bastian 1865 (Nematoda)

Cited by 40 publications

References 10 publications

Mitochondrial DNA variation and cryptic speciation within the free-living marine nematode Pellioditis marina

Mitochondrial DNA variation and cryptic speciation within the free-living marine nematode Pellioditis marina

A critique of Rossberg et al. : noise obscures the genetic signal of meiobiotal ecospecies in ecogenomic datasets

A re-evaluation of marine nematode productivity

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