A Circadian Hatching Rhythm in Nephrops norvegicus (Crustacea: Decapoda)

Möller, Taavi; Branford, J.R.

doi:10.1016/b978-0-08-023217-1.50057-6

Cited by 13 publications

(9 citation statements)

References 6 publications

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“…Whether other newly discovered CHH-ir cells in abdominal segments of shore crab embryos (190) exhibit circadian rhythmicity has not yet been investigated. Interestingly, however, timely surges of contents of CHH in these cells and likely their expression and release patterns appear closely related to larval eclosion and water uptake necessary for eggshell rupture and well known larval hatching rhythms (31,190,192). In juvenile crayfish, a pacemaker system for circadian locomotory behaviour is likely present already from the moment of eclosion (26).…”

Section: Crustacean Hyperglycaemic Hormone (Chh)mentioning

confidence: 99%

Circadian clocks in crustaceans: identified neuronal and cellular systems

Strauß

Dircksen²

2010

Front Biosci

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Circadian rhythms are known for locomotory and reproductive behaviours, and the functioning of sensory organs, nervous structures, metabolism and developmental processes. The mechanisms and cellular bases of control are mainly inferred from circadian phenomenologies, ablation experiments and pharmacological approaches. Cellular systems for regulation summarised here comprise the retina, the eyestalk neuroendocrine X-organ-sinus gland system, several neuropeptides such as red pigment concentrating, hyperglycaemic and pigment-dispersing hormones, and factors such as serotonin and melatonin. No master clock has been identified, but a model of distributed clockwork involves oscillators such as the retinular cells, neurosecretory systems in the optic lobes, putative brain pacemakers, and the caudal photoreceptor. Extraretinal brain photoreceptors mediate entrainment. Comparative analyses of clock neurons and proteins known from insects may allow the identification of candidate clock neurons in crustaceans as putative homologues in the two taxa. Evidence for the existence of "insect-like" intracellular clock proteins and (light sensitive) transcription factors is scarce, but clock-, period-, and cryptochrome-gene products have been localised in the CNS and other organs rendering further investigations into crustacean clockwork very promising.

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Section: Crustacean Hyperglycaemic Hormone (Chh)mentioning

confidence: 99%

Circadian clocks in crustaceans: identified neuronal and cellular systems

Strauß

Dircksen²

2010

Front Biosci

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“…Semilunar cycles are known for semi-terrestrial crabs (Clifford, 1962;Warner, 1967;Henning, 1975;Klassen, 1975;Saigusa and Hidaka, 1978;Seiple, 1979;Saigusa, 1981), intertidal fiddler crabs (von Hagen, 1970;Zucker, 1976Zucker, , 1978Christy, 1978;Wheeler, 1978), and subtidal stomatopods (Reaka, 1976). For the lobsters Nephrops norvegicus (Moller and Branford, 1979), Homarus gammarus (Ennis, 1973;Branford, 1978), and H. americanus (Ennis, 1975), larval release in the laboratory occurs shortly after dusk on a series of consecutive nights; no lunar or semilunar rhythm has been reported. H. americanus occasionally releases larvae during the day (Ennis, 1975).…”

Section: Introductionmentioning

confidence: 99%

RHYTHMS IN LARVAL RELEASE BY AN ESTUARINE CRAB (RHITHROPANOPEUS HARRISH)

Forward¹,

Lohmann²,

Cronin³

1982

The Biological Bulletin

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Ovigerous females of the crab Rhithropanopeus harrisii were collected subtidally, and their rhythms in larval release monitored under constant conditions in the laboratory. Larvae from a single crab are generally released as a burst lasting less than 1 5 minutes. Larval release by crabs from an estuary lacking regular tides mainly occurs in the 2-h interval after sunset and is not related to coastal tides, which suggests a circadian rhythm. This rhythm can be entrained on an altered light-dark cycle. Larval release by crabs from an estuary with semi-diurnal tides begins at high tides and continues for 2 hours, suggesting a circatidal rhythm. Significantly more releases occur during the night. Crabs from the estuary without regular tides change from a circadian to a circatidal rhythm after being in the estuary with semi-diurnal tides. Alternatively, crabs from the estuary with semi-diurnal tides change to a circadian rhythm when exposed to a light-dark cycle and non-tidal conditions in the laboratory. Thus R. harrisii has both circadian and circatidal rhythms in larval release with the expressed rhythm dependent upon prior environmental conditions. Nighttime release may reduce predation, while release at high tide may minimize larval exposure to stressful, low salinity water.

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“…In the laboratory experiments described here hatching occurred throughout the 24-h period, with peaks at night. This was also observed by Moller and Branford (1979). In contrast, Farmer (1974) noted that hatching only occurred at night.…”

Section: Larval Productionmentioning

confidence: 44%

The application of fecundity estimates to determine the spawning stock biomass of Irish Sea Nephrops norvegicus (L.) using the annual larval production method

Briggs¹,

Armstrong²,

Dickey‐Collas³

et al. 2002

ICES Journal of Marine Science

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. 2002. The application of fecundity estimates to determine the spawning stock biomass of Irish Sea Nephrops norvegicus (L.) using the annual larval production method. -ICES Journal of Marine Science, 59: 109-119.Ovigerous female Nephrops were collected by trawl and creel and maintained in individual containers over the nine-month incubation period to investigate aspects of fecundity. Females which extruded eggs in captivity shortly after capture provided an estimate of mean realised fecundity of 104.3 eggs g 1 live weight (s.e.=2.7). Egg loss during incubation, estimated by sampling ovigerous females from research trawl hauls at different times of year, was 36.7 eggs g 1 (s.e.=3.3). A similar value was obtained by monitoring individuals kept in the hatchery. Mean effective fecundity at the time of hatching was estimated as 67.6 eggs g 1 (s.e.=4.3) and is the difference between the number of eggs extruded (realised fecundity) and egg losses during incubation. The abundance of larvae at development stages I, II, and III was estimated over a series of surveys using high-speed plankton samplers. Abundance values were converted to daily production values using relationships between temperature and stage-duration. Annual larval production by stage was estimated by fitting Gaussian curves to the survey estimates. The mortality rate of larvae (Z=0.033 d 1 ; s.e.=0.006) was estimated from the values of annual production by stage, using a maximum likelihood method. Annual production at hatching, estimated as the intercept of the mortality curve, was 440 10 9 larvae (s.e.=62 10 9 ). The biomass of mature female Nephrops in the western Irish Sea in 1995 was estimated from annual larval production and mean fecundity to be 6290 t (CV=0.17). The current ICES estimate of female SSB in 1995 of 7750 t, obtained from analysis of commercial catch data, lies within the 95% confidence limits for the ALP estimate. This indicates that current estimates of fishing mortality for female Nephrops in the Irish Sea may be robust.

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A Circadian Hatching Rhythm in Nephrops norvegicus (Crustacea: Decapoda)

Cited by 13 publications

References 6 publications

Circadian clocks in crustaceans: identified neuronal and cellular systems

Circadian clocks in crustaceans: identified neuronal and cellular systems

RHYTHMS IN LARVAL RELEASE BY AN ESTUARINE CRAB (RHITHROPANOPEUS HARRISH)

The application of fecundity estimates to determine the spawning stock biomass of Irish Sea Nephrops norvegicus (L.) using the annual larval production method

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