Experimental evidence for the humoral stimulation of ripening of the gametes and spawning in the polychaete Arenicola marina (L)

Howie, D. I. D.

doi:10.1016/0016-6480(63)90100-x

Cited by 55 publications

(19 citation statements)

References 10 publications

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“…In this animal, oocytes undergo GVBD in the coelom, and maturation of the gametes is a prerequisite to entering the oviduct [ 5]. Homogenates of the prostomium containing neural tissue will induce egg maturation and spawning in females blocked from maturation by decerebration [6,7]. The stimulus is attributed to a maturation-stimulating hormone (MSH), which induces GVBD and then causes coelomic oocytes to enter the nephromixia followed by spawning in both males and females.…”

Section: Discussionmentioning

confidence: 98%

“…In the lugworm, Arenicola marina, maturation of the oocytes immediately precedes spawning, and the nephromixia will only accept and shed ripe gametes [ 5]. Further experiments by Howie indicated that oocyte maturation, then spawning, were stimulated by a maturation hormone [6,7]. Alternatively, a hormone has been proposed that initiates spawning first in Nephtys [ 8].…”

Section: Introductionmentioning

confidence: 93%

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The activation of gamete migration, maturation and spawning inPectinaria gouldii

Tweedell

1980

International Journal of Invertebrate Reproduction

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 93%

The activation of gamete migration, maturation and spawning inPectinaria gouldii

Tweedell

1980

International Journal of Invertebrate Reproduction

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“…In females, oocyte maturation involves the progression from late prophase of the first meiosis to metaphase following germinal vesicle breakdown (GVBD) (Howie 1961). Oocyte maturation and subsequent spawning are induced by a hormone from the prostomium (Howie 1961, 1963, 1966, Pacey & Bentley 1992a. Recent work has shown that oocyte maturation and subsequent spawning requires 2 steps: production of the substance from the prostomium, termed the Prostomium Maturation Hormone (PMH), which induces the production of a second substance, the Coelomic Maturation Factor (CMF), which is detectable in the coelomic fluid prior to spawning (Watson & Bentley 1997, 1998a.…”

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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“…Prior to spawning it is therefore necessary for the morulae structure to dissociate and for spermatozoa to become free. The process of sperm momla breakdown is under endocrine control from a factor released from the prostomium (Howie, 1963) which has been termed "Sperm Maturation Factor" (SMF) (Bentley, 1985). Various aspects of this process have been investigated (see Howie, 1961Howie, , 1963Bentley, 1985;Bentley et al, 1990) and others are currently the focus of attention (Bentley & Pacey, 1991).…”

Section: Introductionmentioning

confidence: 99%

“…The process of sperm momla breakdown is under endocrine control from a factor released from the prostomium (Howie, 1963) which has been termed "Sperm Maturation Factor" (SMF) (Bentley, 1985). Various aspects of this process have been investigated (see Howie, 1961Howie, , 1963Bentley, 1985;Bentley et al, 1990) and others are currently the focus of attention (Bentley & Pacey, 1991). This study, however, investigates the ultrastructure of mature spermatozoa in A. marina using transmission electron microscopy and observes the ultrastructural changes which occur both during spermatogenesis, and during the liberation of free sperm from sperm morulae.…”

Section: Introductionmentioning

confidence: 99%

An ultrastructural study of spermatogenesis and sperm morula breakdown inArenicola marina (L.) (Annelida: Polychaeta)

Pacey

Bentley

1992

Helgolander Meeresunters

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Spermatogenesis in the lugworm Arenicola marina, in common with other members of Arenicolidae, occurs in the coelomic fluid and results in the formation of discs of mature spermatozoa known as a morulae. Within a morula, individual spermatozoa are connected by a common mass of cytoplasm called the cytophore and therefore make up a syncitium. Immediately prior to spawning, and in response to an endocrine substance known as "Sperm Maturation Factor" (SMF), the structure of the sperm morulae breaks down and free spermatozoa are liberated. These are subsequently spawned from the body cavity. The investigation described here uses transmission electron microscopy to investigate the ultrastructural changes, which accompany spermatogenesis and the breakdown of sperm morulae in response to SMF in vitro. The study demonstrates that the cytophore appears to have a key role both during spermatogenesis and during sperm morula breakdown. The ultrastructure of sperm morulae and of mature spermatozoa is described. The structure of spermatozoa is shown to be primitive with a single flagellum which appears to be coiled at its distal end.

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Experimental evidence for the humoral stimulation of ripening of the gametes and spawning in the polychaete Arenicola marina (L)

Cited by 55 publications

References 10 publications

The activation of gamete migration, maturation and spawning inPectinaria gouldii

The activation of gamete migration, maturation and spawning inPectinaria gouldii

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

An ultrastructural study of spermatogenesis and sperm morula breakdown inArenicola marina (L.) (Annelida: Polychaeta)

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