Reproductive, genetic and ecological evidence thatActinia equinavar.mesembryanthemumand var.fragaceaare not conspecific

Carter, M. A.; Thorpe, J. P.

doi:10.1017/s0025315400045926

Cited by 57 publications

(30 citation statements)

References 39 publications

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“…by Harris and Hopkinson, 1978;Ferguson, 1980). Further information on procedures for Actinia is given by Carter and Thorpe (1981). Shandon electrophoresis equipment was used.…”

Section: Methodsmentioning

confidence: 99%

“…This difference indicates, in our opinion, the probability that Odh in the green morph is qualitatively different from that of other Actinia (cf. Xod differences between A. equina and A. fragacea, Carter and Thorpe, 1981), although the possibility of a massive quantitative difference alone cannot be eliminated entirely. A qualitative difference would provide evidence for genetic differentiation of the green morphs, whilst a quantitative difference may not do so.…”

Section: Enzyme Variationmentioning

confidence: 99%

“…The wide range of colour forms (Tugwell, 1856;Gosse, 1860) and some morphological (Cocks, 1850;Gosse, 1860;Stephenson, 1935;Schmidt, 1971;Carter and Thorpe, 1981), ecological (Teissier and Teissier, 1930;Carter and Thorpe, 1981) and reproductive (Teissier and Teissier, 1930;Carter and Thorpe, 1981) variations have resulted in much debate as to the taxonomic status of individual forms. Various colour morphs have been given specific status by earlier workers (Templeton, 1836;Dalyell, 1848;Cocks, 1850;Tugwell, 1856;Milne-Edwards, 1857).…”

Section: Introductionmentioning

confidence: 99%

“…These 2 varieties have recently been found to show distinct differences in relative shore distributions, weight, methods of reproduction and isozyme patterns and are no longer considered conspecific (Carter and Thorpe, 1981;Manuel, 1981). Manuel (1981) describes Stephenson's (1935) Actinia equina var.…”

Section: Introductionmentioning

confidence: 99%

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Genetic and ecological differentiation between sympatric colour morphs of the common intertidal sea anemone Actinia equine

Haylor¹,

Thorpe²,

Carter³

1984

Mar. Ecol. Prog. Ser.

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The abundant intertidal sea anemone Actinia equina occurs in a variety of colour morphs of which 3 (green, red, brown) are investigated in the present work. Green anemones are known to be morphologically and behaviourally different from the other colour morphs and may be ecologically distinct; it is also known that green morphs are differentially selected by certain nudibranch predators. Differences between morphs are investigated in detail using large numbers of anemones and employing enzyme electrophoresis as criterion for genetic differentiation. The green morph has clearly different ecological preferences both with respect to mean tidal position on the shore and choice of microhabitat; it also differs significantly at 4 of the 17 enzyme loci examined. According to biochemical evidence there is little or no gene flow between sympatnc populations of green and other colour morphs It is suggested that the green Actjnia should best be regarded as a separate species, and the name Actinla prasjna is proposed.

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“…by Harris and Hopkinson, 1978;Ferguson, 1980). Further information on procedures for Actinia is given by Carter and Thorpe (1981). Shandon electrophoresis equipment was used.…”

Section: Methodsmentioning

confidence: 99%

Section: Enzyme Variationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Genetic and ecological differentiation between sympatric colour morphs of the common intertidal sea anemone Actinia equine

Haylor¹,

Thorpe²,

Carter³

1984

Mar. Ecol. Prog. Ser.

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“…Until recently the only taxonomic scheme in general use was that of Stephenson (1935) Thorpe (1981) other biochemical genetic studies have investigated the structure of gene pools in Actinia equina (e.g. Orr et al 1982, 1984) and in particular Haylor et al (1984) have shown that a certain green morph is reproductively isolated from other sympatrically occurring morphs of the species.…”

Section: Introductionmentioning

confidence: 99%

Further genetic evidence for the reproductive isolation of green sea anemone Actinia prasina Gosse from common intertidal beadlet anemone Actinia equina (L.)

Solé‐Cava¹,

Thorpe²

1987

Mar. Ecol. Prog. Ser.

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ABSTRACT. Earher work on Actin~a indicated that a green morph, which has been described as A. prasina Gosse, 1s genetically distinct from the more common A. equina (L.). Sympatnc populations of green and other morphs of Actinja were obtained from Fleshwick Bay (Isle of Man) and compared by enzyme electrophoresis and by nematocyst analysis. No nematocyst differences were found, but allele frequencies at several enzyme loci differed significantly. It is concluded that at Fleshwick Bay A. prasina is genetically distinct from A. equina and is a valid species.

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An ultrastructural study of oocyte growth within the endoderm and entry into the mesoglea in Actinia fragacea (Cnidaria, anthozoa)

Larkman

1983

Journal of Morphology

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Sea anemone gametes arise in the endoderm but migrate into the mesoglea at an early stage. In order to observe this process, large individuals of Actinia fragacea were collected from the same intertidal location at regular intervals over a 2-year period, and their gonads were examined by light and electron microscopy. The cellular origin of the oocytes is unclear, but the smallest recognizable oocytes are rounded cells, 6-8 microns in diameter, with relatively large nuclei which may contain synaptinemal complexes. Their cytoplasm contains numerous ribosomes, a flagellar basal-body-rootlet complex, and distinctive dense structures also present in male germ cells but not found in anemone nongerminal cells. During the endodermal phase of growth, the density of the oocyte nucleus increases, a single nucleolus becomes prominent, and mitochondria and glycogen accumulate in the cytoplasm. Most oocytes, but not all, only begin major vitellogenesis after entry into the mesoglea. Most oocytes enter the mesoglea vitellogenesis after entry into the mesoglea. Most oocytes enter the mesoglea before they attain a diameter of 25 microns. The oocytes migrate toward and enter the mesoglea by a process resembling amoeboid movement. During entry, the oocytes are constricted into a characteristic "hourglass" shape and become covered by a basal lamina continuous with that of the gonad epithelium. The last part of the oocyte to enter the mesoglea forms an intimate relationship with the surrounding endodermal cells, which is maintained after entry is complete, and is thought to be important in the establishment of the trophonema.

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Reproductive, genetic and ecological evidence thatActinia equinavar.mesembryanthemumand var.fragaceaare not conspecific

Cited by 57 publications

References 39 publications

Genetic and ecological differentiation between sympatric colour morphs of the common intertidal sea anemone Actinia equine

Genetic and ecological differentiation between sympatric colour morphs of the common intertidal sea anemone Actinia equine

Further genetic evidence for the reproductive isolation of green sea anemone Actinia prasina Gosse from common intertidal beadlet anemone Actinia equina (L.)

An ultrastructural study of oocyte growth within the endoderm and entry into the mesoglea in Actinia fragacea (Cnidaria, anthozoa)

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