Genetic evidence for two species of lug-worm {Arenicola) in South Wales

Cadman, P.S.; Nelson-Smith, A.

doi:10.3354/meps064107

Cited by 21 publications

(14 citation statements)

References 7 publications

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“…; Mustaquim ; see Table S3), few polychaetes were analysed with molecular data before 1990s. By then it became common to use protein electrophoresis (allozymes and general protein patterns) for assessing species boundaries (Cadman & Nelson‐Smith ; Baoling et al . ; Robotti et al .…”

Section: Molecular Approachesmentioning

confidence: 99%

Cryptic polychaete diversity: a review

2013

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Nygren, A. (2014). Cryptic polychaete diversity: a review. -Zoologica Scripta, 43, 172-183. This review summarises the current knowledge on cryptic species of polychaetes, one of the most dominant taxa in marine communities, and gives a brief overview of the different methods that has been used for their disclosure. Cryptic species constitute an important part of biodiversity and they are common among all kinds of polychaetes, with different life history traits, and may have sympatric as well as allopatric distributions. It is emphasised that cryptic species must not be neglected for a variety of reasons, and even though the magnitude of cryptic species is largely unknown the available data on polychaetes clearly demonstrate that morphology alone seriously underestimate the number of species. It is suggested that future research should focus on appropriately designed case-studies using combined approaches, as well as on large-scale whole sample analyses using next-generation sequencing in order to be able to answer the many questions that still remains.

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Section: Molecular Approachesmentioning

confidence: 99%

Cryptic polychaete diversity: a review

2013

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“…by a variety of ecological, morphological and genetic criteria (Cadman & Nelson-Smith 1990, Cadman 1997. However, until now, no direct comparisons or exChemical induction of oocyte maturation periments have been undertaken to examine whether these differences extend to the reproductive biology of Maturation of each species' oocytes only occurred the 2 species.…”

Section: A M R I Mmentioning

confidence: 99%

“…The recent work of Cadman & Nelson-Smith (1990 and Cadman (1997) has shown, through the examination of a number of morphological, ecological and genetic characteristics, that this distinction was valid, and consequently the 'laminarian' variety has been classed as a separate species, Arenicola defodiens (Cadman & Nelson-Smith).…”

Section: Introductionmentioning

confidence: 99%

Control of oocyte maturation, sperm activation and spawning in two lugworm species:Arenicola marina and A. defodiens

Watson¹,

Cadman²,

Paterson³

et al. 1998

Mar. Ecol. Prog. Ser.

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In addition to the morphological differences between Arenicola defodiens (Cadman and Nelson-Smith, 1993) and Arenicola marina (L.) this study demonstrales clear differences in the reproductive biology, timing of reproduction at a population level, and endocrine control of reproduction in females. Fecundity IS significantly higher in females of A. marina and the mean diameter of their fully grown oocytes is also significantly larger than in A. defodiens. The timing of reproduction at a population level is also different with A. defodjens spawning approximately 1 to 2 mo later than sympatric A. marina. In vitro and in viva experiments have established fundamental differences as well as similarities in the hormonal control of reproduction of both sexes between the 2 species. Male A. defodienscan be induced to spawn by the injection of 8,11,14-eicosatrienoic acid into the coelomic cavity, putatively shown to be the natural sperm maturation factor and spawning hormone in A. marina. In females, injection of female prostomial homogenate from either species into the coelomic cavity induces oocyte maturation and subsequent spawning in both species. However, oocytes of A. marina, whilst maturing in the presence of CMF (Coelomic Maturation Factor) in vjtro, do not mature in the presence of prostomial homogenate of either species, whereas A. defodiens oocytes do. In A. marina, oocyte maturation and subsequent spawning is under the control of 2 hormones: (1) a substance from the prostomium, Prostom a l Maturation Hormone (PMH), which induces the production of (2) CMF whlch acts on the oocyte. In A. defodiens, we show that only PMH is required for oocyte maturation and spawning. The in vitro induction of oocyte maturation in A. marina, by a variety of chemicals and treatments that have already been shown to induce maturation in A. defodiens and species from other phyla, was investigated. None of the chen~icals and treatments tested induces maturation in A. marina or A. defodiens oocytes.

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“…Therefore ancient life-history description has to be used with caution (Cadman and Nelson-Smith, 1990).…”

Section: Introductionmentioning

confidence: 99%

Annelid polychaetes experience metabolic acceleration as other Lophotrochozoans: Inferences on the life cycle of Arenicola marina with a Dynamic Energy Budget model

Cubber

Lefebvre

Lancelot

et al. 2019

Ecological Modelling

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Arenicola marina is a polychaete (Lophotrochozoan) displaying a complex bentho-pelagic life cycle with two larval dispersal phases, only partially described up to now. A Dynamic Energy Budget (DEB) model was applied to the species in order to reconstruct its life cycle and growth under in situ environmental conditions. Two types of DEB models are usually applied to other Lophotrochozoans displaying similar life cycles: the standard (std-) model, applied to polychaetes (5 entries among the 1524 of the Add-my-Pet database on the 18/10/2018), and the abj-model, which includes an acceleration of metabolism between birth and metamorphosis, and which has been applied to most molluscs (77 abj-entries out of the 80 mollusc entries) enabling better fit predictions for the early life stages. The parameter estimation was performed with both models to assess the suitability of an abj-model for A. marina. The zero-variate dataset consisted of length and age data at different life cycle stages, the lifespan, the maximum observed length, and the wet weight of an egg. The uni-variate dataset consisted of two growth experiments from the literature at two food levels and several temperatures, laboratory data of oxygen consumption at several temperatures, and fecundity for different lengths. The predictions of the abj-model fitted better to the data (SMSE = 0.29). The acceleration coefficient was ca 11, which is similar to mollusc values. The field growth curves and the scaled functional responses (as a proxy of food levels) were suitably reconstructed with the new parameter set. The reconstruction of the early life-stages chronology according to in situ environmental conditions of a temperate marine ecosystem indicated a first dispersal phase of 5 days followed by a 7 months temporary settlement before a second dispersal phase in spring, at the end of metamorphosis. We emphasize the need for using abj-models for polychaetes in future studies.

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Genetic evidence for two species of lug-worm {Arenicola) in South Wales

Cited by 21 publications

References 7 publications

Cryptic polychaete diversity: a review

Cryptic polychaete diversity: a review

Control of oocyte maturation, sperm activation and spawning in two lugworm species:Arenicola marina and A. defodiens

Annelid polychaetes experience metabolic acceleration as other Lophotrochozoans: Inferences on the life cycle of Arenicola marina with a Dynamic Energy Budget model

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