scholarly journals Behavioral responses to variable predation risk in the California spiny lobster Panulirus interruptus

2010 ◽  
Vol 420 ◽  
pp. 135-144 ◽  
Author(s):  
CL Loflen ◽  
KA Hovel
Keyword(s):  
Predation Risk ◽  
Spiny Lobster ◽  
Behavioral Responses ◽  
Panulirus Interruptus

Patterns of shelter use and their effects on the relative survival of subadult California spiny lobster (Panulirus interruptus)

2016 ◽  
Vol 67 (8) ◽  
pp. 1153 ◽  
Author(s):  
Amalia M. Harrington ◽  
Kevin A. Hovel
Keyword(s):  
Predation Risk ◽  
Field Experiments ◽  
Spiny Lobster ◽  
Relative Survival ◽  
Panulirus Interruptus ◽  
Rocky Reefs ◽  
Comprehensive Examination ◽  
Spiny Lobsters ◽  
Shelter Selection ◽  
Natural Reefs

Spiny lobsters use refuge habitat and gregarious behaviour to reduce predation risk, particularly in their vulnerable juvenile and subadult stages. We characterised patterns of sheltering behaviour in the California spiny lobster (Panulirus interruptus (Randall)) on southern California rocky reefs and used manipulative experiments to examine how these behaviours affect the survival of subadult lobsters and shelter selection. Lobsters generally were gregarious and subadults were commonly found inhabiting shelters with adult lobsters. Tethering experiments with subadults indicated that communal denning increases the odds of survival only when adult lobsters are part of aggregations. This corresponded to results from a shelter choice experiment in the laboratory, where the presence of predators caused subadults to shelter more often with adult conspecifics rather than other subadults. Despite the gregarious nature of P. interruptus, solitary subadults were common at all sites. Although field experiments clearly indicated that solitary lobsters increased their odds of survival by inhabiting shelters scaled to body size, evidence that lobsters exhibit shelter scaling on natural reefs was mixed. Our results indicate that subadult P. interruptus exhibit similar behavioural strategies as other spiny lobsters to reduce predation risk, and they provide a more comprehensive examination of P. interruptus behaviour than previously available.

Do changes in reef habitats influence relative predation risk on the juvenile Australasian spiny lobster, Jasus edwardsii (Hutton, 1875)?

Crustaceana ◽  
2015 ◽  
Vol 88 (7-8) ◽  
pp. 839-856 ◽  
Author(s):  
J. Hesse ◽  
J. A. Stanley ◽  
A. G. Jeffs
Keyword(s):  
Predation Risk ◽  
Spatial Scales ◽  
Spiny Lobster ◽  
Habitat Type ◽  
Small Spatial Scale ◽  
Important Species ◽  
Early Juvenile ◽  
Risk Of Predation ◽  
Jasus Edwardsii ◽  
Commercially Important

Kelp habitats are in decline in many temperate coastal regions of the world due to climate change and expansion of populations of grazing urchins. The loss of kelp habitat may influence the vulnerability to predators of the juveniles of commercially important species. In this study relative predation rates for kelp versus barren reef habitat were measured for early juvenile Australasian spiny lobster, Jasus edwardsii (Hutton, 1875), on the northeastern coast of New Zealand using tethering methods. Variation in assemblages of predators over small spatial scales appeared to be more important for determining the relative predation of lobsters, regardless of habitat type. Therefore, the assessment of relative predation risk to early juvenile lobsters between kelp and barren habitats will require more extensive sampling at a small spatial scale, as well as a specific focus on sampling during crepuscular and nocturnal periods when these lobsters are most at risk of predation.

PHYSIOLOGICAL AND BEHAVIORAL RESPONSES TO PREDATORS SHAPE THE GROWTH/PREDATION RISK TRADE-OFF IN DAMSELFLIES

Ecology ◽  
2001 ◽  
Vol 82 (6) ◽  
pp. 1535-1545 ◽  
Author(s):  
Mark A. McPeek ◽  
Margaret Grace ◽  
Jean M. L. Richardson
Keyword(s):  
Predation Risk ◽  
Behavioral Responses ◽  
Trade Off

Serotonin Transduction Cascades Mediate Variable Changes in Pyloric Network Cycle Frequency in Response to the Same Modulatory Challenge

2008 ◽  
Vol 99 (6) ◽  
pp. 2844-2863 ◽  
Author(s):  
Nadja Spitzer ◽  
Gennady Cymbalyuk ◽  
Hongmei Zhang ◽  
Donald H. Edwards ◽  
Deborah J. Baro
Keyword(s):  
Steady State ◽  
Spiny Lobster ◽  
Cycle Frequency ◽  
Panulirus Interruptus ◽  
Response System ◽  
Pyloric Network ◽  
Bath Application ◽  
The Mean ◽  
Circuit Output ◽  
Sustained Increase

A fundamental question in systems biology addresses the issue of how flexibility is built into modulatory networks such that they can produce context-dependent responses. Here we examine flexibility in the serotonin (5-HT) response system that modulates the cycle frequency (cf) of a rhythmic motor output. We found that depending on the preparation, the same 5-min bath application of 5-HT to the pyloric network of the California spiny lobster, Panulirus interruptus, could produce a significant increase, decrease, or no change in steady-state cf relative to baseline. Interestingly, the mean circuit output was not significantly different among preparations prior to 5-HT application. We developed pharmacological tools to examine the preparation-to-preparation variability in the components of the 5-HT response system. We found that the 5-HT response system consisted of at least three separable components: a 5-HT2βPan-like component mediated a rapid decrease followed by a sustained increase in cf; a 5-HT1αPan-like component produced a small and usually gradual increase in cf; at least one other component associated with an unknown receptor mediated a sustained decrease in cf. The magnitude of the change in cf produced by each component was highly variable, so that when summed they could produce either a net increase, decrease, or no change in cf depending on the preparation. Overall, our research demonstrates that the balance of opposing components of the 5-HT response system determines the direction and magnitude of 5-HT–induced change in steady-state cf relative to baseline.

scholarly journals Dopamine-induced oscillations of the pyloric pacemaker neuron rely on release of calcium from intracellular stores

2011 ◽  
Vol 106 (3) ◽  
pp. 1288-1298 ◽  
Author(s):  
Lolahon R. Kadiri ◽  
Alex C. Kwan ◽  
Watt W. Webb ◽  
Ronald M. Harris-Warrick
Keyword(s):  
Spiny Lobster ◽  
Ionic Currents ◽  
Calcium Currents ◽  
Cycle Frequency ◽  
Panulirus Interruptus ◽  
Two Photon Microscopy ◽  
Two Photon ◽  
Pyloric Network ◽  
Nervous System Function ◽  
External Calcium

Endogenously bursting neurons play central roles in many aspects of nervous system function, ranging from motor control to perception. The properties and bursting patterns generated by these neurons are subject to neuromodulation, which can alter cycle frequency and amplitude by modifying the properties of the neuron's ionic currents. In the stomatogastric ganglion (STG) of the spiny lobster, Panulirus interruptus, the anterior burster (AB) neuron is a conditional oscillator in the presence of dopamine (DA) and other neuromodulators and serves as the pacemaker to drive rhythmic output from the pyloric network. We analyzed the mechanisms by which DA evokes bursting in the AB neuron. Previous work showed that DA-evoked bursting is critically dependent on external calcium (Harris-Warrick RM, Flamm RE. J Neurosci 7: 2113–2128, 1987). Using two-photon microscopy and calcium imaging, we show that DA evokes the release of calcium from intracellular stores well before the emergence of voltage oscillations. When this release from intracellular stores is blocked by antagonists of ryanodine or inositol trisphosphate (IP3) receptor channels, DA fails to evoke AB bursting. We further demonstrate that DA enhances the calcium-activated inward current, ICAN, despite the fact that it significantly reduces voltage-activated calcium currents. This suggests that DA-induced release of calcium from intracellular stores activates ICAN, which provides a depolarizing ramp current that underlies endogenous bursting in the AB neuron.

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