A Two Phase Photoperiodic Response Controlling the Annual Gametogenic Cycle in<i>Harmothoe imbricata</i>(L.) (Polychaeta: Polynoidae)

Clark, Shawn M.

doi:10.1080/01688170.1988.10510383

Cited by 27 publications

(22 citation statements)

References 16 publications

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“…Environmental data obtained during this study suggests that sea surface temperatures were on the increase and the mean number of daylight hours had reached its upper limits. Temperature and photoperiod have been linked to the induction of spawning in a number of marine invertebrates and often there is a threshold level, minimum or maximum, which must be reached for spawning to be initiated (Goerke 1984;Clark 1988;Watson et al 2000). Temperature recordings during the 3-year study show a high degree of variability throughout the projected spawning period, ranging from 13 C to 18 C, while the number of daylight hours increased to reach the upper range in yearly means.…”

Section: Elucidating the Time Of Spawningmentioning

confidence: 96%

Reproductive biology and population ecology of the marine fan wormSabella pavonina(Savigny) (Polychaeta: Sabellidae)

Murray

Watson

Giangrande

et al. 2011

Invertebrate Reproduction & Development

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The reproductive biology and population ecology of the sabellid polychaete, Sabella pavonina (Savigny) inhabiting an intertidal sand bank in Langstone Harbour, Portsmouth, was investigated between February 2007 and June 2009. 'Blind' thrown quadrats and sediment cores were used to characterise population distribution patterns at the site, and monthly coelomic fluid samples from 30 individuals were used to investigate the reproductive biology of the population, sex of the specimen, the presence of coelomocytes and the development of oocytes. Highest population densities (30.58 m À2 AE 8.05) were recorded on the low shore (0.4 m above chart datum) where the largest size particle fractions and lowest percentage organic content were found. Poisson distribution analysis showed the population was 'clumped' at the shore level, with a maximum number of 188 individuals in a 0.25 m 2 quadrat, and within individual quadrats with up to 23 individuals in a 100 cm 2 subsection. Sabella pavonina has an annual reproductive cycle which culminates in May/June spawning period. Oogenesis was a long process, first observed by the presence of small eggs (20 mm) from September onwards and maximum oocyte diameters were recorded (270 mm) between May and June prior to spawning. Between-and withinindividual synchronicity was greatest in the early stages of oogenesis (October to February) when oocyte diameters ranged from 50-100 mm; however, increasing oocyte diameters were observed from March when rapid growth was initiated. Day length and sea temperature are candidates for exogenous cues controlling gametogenesis and possible mechanisms concerning fertilization in the species are discussed.

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Section: Elucidating the Time Of Spawningmentioning

confidence: 96%

Reproductive biology and population ecology of the marine fan wormSabella pavonina(Savigny) (Polychaeta: Sabellidae)

Murray

Watson

Giangrande

et al. 2011

Invertebrate Reproduction & Development

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“…A transition to long photophase days in the spring stimulates rapid oocyte growth (Garwood & Olive 1982, Clark 19881, the critical daylength being between LD 10:14 and 11:13. A second photoperiodic effect stabilises oogenic growth; oosorption will occur in female H. imbricata during the winter unless they experience 42 d in which the photophase in a 24 h LD cycle is less than 13 h (Clark 1988). The response to static fixed LD cycles was the same as to progressively changing LD cycles (Olive 1985), and time is measured from the critical point in a changing sequence of daylengths.…”

Section: Discussionmentioning

confidence: 99%

Influence of photoperiod and temperature on oocyte growth in the semelparous polychaete Nereis (Neanthes) virens

Olive¹,

Rees²,

Djunaedi³

1998

Mar. Ecol. Prog. Ser.

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Environmental factors influencing the rate of oogenesis in the seasonal cycle of the semelparous polychaete Nereis (Neanthes) virens Sars have been investigated in specimens reared under commercial conditions (concrete tanks under natural light supplied with a mixture of power station heated and ambient sea water to maintain ca 18°C all year round). The rate of oocyte growth is strongly influenced by the external photoperiod and the responses to static 24 h LD (light-dark) cycles have been investigated. Oocyte growth is more rapid when specimens are exposed to a 24 h LD cycle in which the photophase is below a critical value between 1 2 and 13 h The critical photopenod transition in natural environments is therefore at the autumn equinox hr. rJirens are able to respond to transfer between LD 16:8 h and LD 8 16 h at all times of the year, which suggests the operation of a continuously consulted system of photoperiod~c control. The rate of oocyte growth in co~llpetent specimens is a 11near function of the number of LD 8-16 h cycles experienced. The critical photopt!riod divides the solar year into 2 nearly equal periods, with the short day period (winter) favouring oocyte growth. There is a synergism between the effects of photoperiod and seasonally reducing temperature. During the cdlendar winter transition to LD 8:16 h or other LD cycles below the critical value initiates rapid oocyte growth whatever the temperature but in the calendar summer this only occurs if the external temperature is also reduced to 12OC or below. The response to photoperiod and temperature is moderated by internal factors and under commercial production systems elevated rates of oocyte growth can only be achieved in females that are about 1 yr old. The oocyte growth induced by exposure to LD 8:16 h light cycles and low temperature is similar to, but slightly less than, that induced by hormone depnvatlon, i.e. supra-oesophageal ganglion ablation. The results are discussed in relation to the control of seasonal cycles in Nereidae, the role of the endocrine system and ~n the context of the life history theory for long lived semelparous organisms with variable age at maturity

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“…The importance of these environmental factors has been documented for polychaetes (Clark 1988, Chu & Levin 1989, Giangrande 1997 and other invertebrates (see Giese & Kanatani 1987 for a review). The multiple stepwise regression did reveal that day length was important in explaining fecundity variance for both intertidal and subtidal P. lapidosa.…”

Section: Seasonal Entrainment Of Gametogenesismentioning

confidence: 99%

Influence of wave-induced disturbance on seasonal spawning patterns in the sabellariid polychaete Phragmatopoma lapidosa

McCarthy¹,

Young²,

Emson³

2003

Mar. Ecol. Prog. Ser.

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The effect of wave-induced disturbance on seasonal spawning patterns of the opportunistic polychaete Phragmatopoma lapidosa (Kinberg, 1867) was investigated by comparing seasonal fecundity, egg size and adult size between intertidal and subtidal worms at Boynton Beach, Florida. Fecundity patterns showed spawning peaks in summer and fall in both habitats, with reduced spawning in late fall and early winter. Subtidal females averaged 1015.2 eggs mm -1 body length (range 0 to 2000 eggs mm -1 ), while intertidal females averaged 607.4 eggs mm -1 (range 0 to 1520 eggs mm -1 ). Mean egg diameters were not significantly different between worms from the 2 habitats, ranging between 90.4 µm (SD = 3.7) and 89.5 µm (SD = 4.3) for intertidal and subtidal worms respectively. Inter-and intra-census comparisons of egg diameter, fecundity and adult length revealed few statistically significant relationships, suggesting that intertidal and subtidal worms were the same age. Adult lengths in both habitats did change seasonally. The smallest adult worms were found shortly after massive fall recruitment replaced a large percentage of individuals in both intertidal and subtidal populations. Stepwise multiple regression indicated that 76.2% of the variance in intertidal fecundity was explained by a negative correlation with wave height (40.4%), and a positive correlation with day length (34.7%). In contrast, 85.5% of the variance in subtidal fecundity was explained by a positive correlation with day length (77.4%), and a negative correlation with chlorophyll a concentration (8.1%). While habitat-specific differences in energy available for gametogenesis probably contribute towards the observed fecundity trends, the force of crashing waves could also influence fecundity, as it may affect frequency of spawning in intertidal but not subtidal habitats.KEY WORDS: Phragmatopoma · Polychaetes · Fecundity · Spawning · Reproductive plasticity Resale or republication not permitted without written consent of the publisher

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A Two Phase Photoperiodic Response Controlling the Annual Gametogenic Cycle inHarmothoe imbricata(L.) (Polychaeta: Polynoidae)

Cited by 27 publications

References 16 publications

Reproductive biology and population ecology of the marine fan wormSabella pavonina(Savigny) (Polychaeta: Sabellidae)

Reproductive biology and population ecology of the marine fan wormSabella pavonina(Savigny) (Polychaeta: Sabellidae)

Influence of photoperiod and temperature on oocyte growth in the semelparous polychaete Nereis (Neanthes) virens

Influence of wave-induced disturbance on seasonal spawning patterns in the sabellariid polychaete Phragmatopoma lapidosa

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