Ecology of Juvenile and Adult Homarus

Cooper, Richard A.; Uzmann, Joseph R.

doi:10.1016/b978-0-08-091734-4.50010-x

Cited by 86 publications

(64 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Small lobsters are shelter-bound with preference to rocky sites, where they can hide from predators, digging holes in gravel, sand and softer sediments between boulders, where they spend most of their time especially as juveniles and during moulting (e.g. Cooper & Uzmann 1980;Lawton & Lavalli 1995). Juvenile lobsters seek hiding places directly after release.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature on the moulting and locomotory activity of hatchery-reared juvenile lobsters (Homarus gammarus) at Helgoland (North Sea)

Schmalenbach

Búchholz

2013

Marine Biology Research

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Effects of temperature on the moulting and locomotory activity of hatchery-reared juvenile lobsters (Homarus gammarus) at Helgoland (North Sea)

Schmalenbach

Búchholz

2013

Marine Biology Research

View full text Add to dashboard Cite

“…This finding may be correlated with the habits of lobsters, which are most active around dusk (Weiss, 1970;Cooper and Uzmann, 1980;Chabot et al, 2001). This rhythm of neuronal proliferation is regulated by an endogenous oscillator that is entrained by the light:dark (L:D) cycle (Goergen et al, 2002).…”

mentioning

confidence: 86%

“…The logical extension of this idea is that local activity patterns imposed by differential inputs to the OLs and ALs may be able to influence the synthesis, degradation, uptake and release of serotonin in these regions. Serotonin levels in the OL arbors of the DGNs could thereby be altered by chemosensory stimulation when lobsters become aroused and begin to forage during the hours just prior to dusk (Weiss, 1970;Ennis, 1983;Cooper and Uzmann, 1980;Arechiga et al, 1993;Chabot et al, 2001). Zimmer-Faust et al (1996) have shown, using behavioral tests, that the activity state does influence the sensitivity of spiny lobsters and crabs to food odorants in the water and that such sensitivity is much higher during periods when physical activity is high.…”

Section: Serotonergic Rhythms In the Olfactory And Accessory Lobesmentioning

confidence: 99%

Regulation of serotonin levels by multiple light-entrainable endogenous rhythms

Wildt

Goergen

Benton

et al. 2004

Journal of Experimental Biology

View full text Add to dashboard Cite

This study examined whether serotonin levels in the brain of the American lobster, Homarus americanus, are under circadian control. Using high-performance liquid chromatography and semi-quantitative immunocytochemical methods, we measured serotonin levels in the brains of lobsters at six time points during a 24-h period. Lobsters were maintained for 2·weeks on a 12·h:12·h light:dark cycle followed by 3·days of constant darkness. Under these conditions, brain serotonin levels varied rhythmically, with a peak before subjective dusk and a trough before subjective dawn. This persistent circadian rhythm in constant darkness indicates that serotonin levels are controlled by an endogenous clock. Animals exposed to a shifted light cycle for >10·days, followed by 3·days in constant darkness, demonstrate that this rhythm is light entrainable. Separate analyses of two pairs of large deutocerebral neuropils, the accessory and olfactory lobes, show that serotonin levels in these functionally distinct areas also exhibit circadian rhythms but that these rhythms are out of phase with one another. The olfactory and accessory lobe rhythms are also endogenous and light entrainable, suggesting the presence of multiple clock mechanisms regulating serotonin levels in different brain regions.

show abstract

“…Adults sometimes move seasonally for moulting and reproductive purposes or episodically to avoid short-term, adverse environmental conditions; they then return accurately to their original area (homing), often to the same den (Herrnkind 1980). Shelters of spiny lobsters usually consist of natural caves and crevices in firm, mostly rocky, substrates in contrast to the true lobsters that deliberately construct dens in soft substrates (Cooper & Unzmann 1980). Subadults of spiny lobsters may exhibit permanent, one-way movements (either onshore or offshore) from their settlement sites to the adult breeding areas, or longshore migrations against the current that had displaced their larvae downstream (contranatant migration).…”

Section: Migratory Behaviour and Adaptive Movementsmentioning

confidence: 99%

Review

George

2005

New Zealand Journal of Marine and Freshwater Research

View full text Add to dashboard Cite

A comparison of the documented ecology and behaviour of the separate phases in the life cycles is presented. Data gathered during the review show that during the evolution of the family from deeper-water habitats to the more rapidly fluctuating shallower waters, there have been many biological adjustments at each phase in their life cycles. In the more ancient Stridentes genera, like Puerulus, the larvae are found well below the surface waters and the pueruli often settle at greater depths than those of the adults. Long incubation times, few larval instars, and year-round spawning are probably their life cycle characteristics. As an "intermediateevolved" genus of Stridentes, Palinurus lives along the outer shelf, grows slowly, matures late, and breeds seasonally once a year. Incubation time is long, the larvae live at depth, the number of larval instars is limited, and the puerulus is a weak swimmer. Settlement is often downstream of the breeding stock. Incubation times are short for the more recently evolved Stridentes Panulirus, the larvae pass through many instars in the surface waters to c. 200 m. Some pueruli settle in special coastal habitats, others settle in the same habitat as the adult. Breeding in the cooler water First Major Lineage species is seasonal, one or two broods being pro- changes from deep to shallower water is comparable with that of Stridentes. Incubation is probably long in the more ancient Projasus, the larvae are rare in surface waters and the pueruli settle at depths similar to those of the adults. Sagmariasus and Jasus breed once during a defined season, incubation time is moderate, and the larvae pass through many instars. The pueruli of Sagmariasus settle downstream and exhibit contranatant migration whereas the pueruli of Jasus swim strongly to their shallow habitats. In each life cycle phase, migration methods range from vertical paddling in phyllosomata, horizontal swimming in pueruli, and horizontal walking when juveniles move to adult habitats. Adult movements are associated with foraging, searching for shelter, avoiding adverse seasonal conditions, or walking to preferred offshore locations for moulting and reproduction.

show abstract

Ecology of Juvenile and Adult Homarus

Cited by 86 publications

References 24 publications

Effects of temperature on the moulting and locomotory activity of hatchery-reared juvenile lobsters (Homarus gammarus) at Helgoland (North Sea)

Effects of temperature on the moulting and locomotory activity of hatchery-reared juvenile lobsters (Homarus gammarus) at Helgoland (North Sea)

Regulation of serotonin levels by multiple light-entrainable endogenous rhythms

Review

Contact Info

Product

Resources

About