Behavioural responses of the European spiny lobster, Palinurus elephas (Fabricius, 1787), to conspecific and synthetic sounds

This study examined the effects of three different acoustic stimuli on the behaviour of the European spiny lobster,Palinurus elephas(Fabricius, 1787). Twenty male and 20 female lobsters were exposed to: a low-frequency linear sweep tone (0.1-20 kHz), a high-frequency linear sweep tone (20-80 kHz), conspecific sounds (rasp: train of wideband pulses), and no sound stimulation (control). After a habituation period, lobsters were audio-video recorded for 30 min. Tail flipping, sound emissions, distance moved, mobility, velocity and movement were recorded. Differences between the males and females in the rasp playback condition were observed, with the females having highest values of the behaviours under study. Moreover, when analysing the male and female combined data we found that exposure to synthetic stimuli did not produce any significant variations. Finally, it can be assumed that there is: a capacity for rasp sound perception, and a significant role for these pulses in the intraspecific communication ofP. elephas.

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Sources of Tropical Subseasonal Skill in the CFSv2

Monthly Weather Review ◽

10.1175/mwr-d-19-0289.1 ◽

2020 ◽

Vol 148 (4) ◽

pp. 1553-1565 ◽

Cited By ~ 1

Author(s):

Carl J. Schreck ◽

Matthew A. Janiga ◽

Stephen Baxter

Keyword(s):

Indian Ocean ◽

Low Frequency ◽

Equatorial Pacific ◽

Convectively Coupled Equatorial Waves ◽

Subseasonal Variability ◽

The Pacific ◽

Fourier Filtering ◽

The Indian Ocean ◽

Rainfall Anomalies ◽

Combined Data

Abstract This study applies Fourier filtering to a combination of rainfall estimates from TRMM and forecasts from the CFSv2. The combined data are filtered for low-frequency (LF, ≥120 days) variability, the MJO, and convectively coupled equatorial waves. The filtering provides insight into the sources of skill for the CFSv2. The LF filter, which encapsulates persistent anomalies generally corresponding with SSTs, has the largest contribution to forecast skill beyond week 2. Variability within the equatorial Pacific is dominated by its response to ENSO, such that both the unfiltered and the LF-filtered forecasts are skillful over the Pacific through the entire 45-day CFSv2 forecast. In fact, the LF forecasts in that region are more skillful than the unfiltered forecasts or any combination of the filters. Verifying filtered against unfiltered observations shows that subseasonal variability has very little opportunity to contribute to skill over the equatorial Pacific. Any subseasonal variability produced by the model is actually detracting from the skill there. The MJO primarily contributes to CFSv2 skill over the Indian Ocean, particularly during March–May and MJO phases 2–5. However, the model misses opportunities for the MJO to contribute to skill in other regions. Convectively coupled equatorial Rossby waves contribute to skill over the Indian Ocean during December–February and the Atlantic Ocean during September–November. Convectively coupled Kelvin waves show limited potential skill for predicting weekly averaged rainfall anomalies since they explain a relatively small percent of the observed variability.

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Differential catchability of male and female European spiny lobster Palinurus elephas (Fabricius, 1787) in traps and trammelnets

Fisheries Research ◽

10.1016/j.fishres.2003.09.021 ◽

2003 ◽

Vol 65 (1-3) ◽

pp. 295-307 ◽

Cited By ~ 17

Author(s):

Raquel Goñi ◽

Antoni Quetglas ◽

Olga Reñones

Keyword(s):

Spiny Lobster ◽

Male And Female ◽

Palinurus Elephas

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Field assessment of behavioural responses of southern stingrays ( Hypanus americanus ) to acoustic stimuli

Royal Society Open Science ◽

10.1098/rsos.191544 ◽

2020 ◽

Vol 7 (1) ◽

pp. 191544

Author(s):

Megan F. Mickle ◽

Rachel H. Pieniazek ◽

Dennis M. Higgs

Keyword(s):

Low Frequency ◽

Free Swimming ◽

Male And Female ◽

Behavioural Responses ◽

Acoustic Stimuli ◽

Field Assessment ◽

Rest Time ◽

Field Setting ◽

Behavioural Audiogram

The ability of elasmobranchs to detect and use sound cues has been heavily debated in previous research and has only recently received revived attention. To properly understand the importance of sound to elasmobranchs, assessing their responses to acoustic stimuli in a field setting is vital. Here, we establish a behavioural audiogram of free-swimming male and female southern stingrays ( Hypanus americanus ) exposed to low-frequency tones. We demonstrate that female stingrays exposed to tones (50–500 Hz) exhibit significant changes in swimming behaviours (increased time spent swimming, decreased rest time, increased surface breaches and increased side swimming with pectoral flapping) at 140 dB re 1 µPa (−2.08 to −2.40 dB re 1 m s −2 ) while males exposed to the same tones did not exhibit a change in these behaviours until 160 dB re 1 µPa (−1.13 to −1.21 dB re 1 m s −2 ). Our results are the first demonstration of field responses to sound in the Batoidea and show a distinct sensitivity to low-frequency acoustic inputs.

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Homing and home range of the European spiny lobster, Palinurus elephas (Decapoda, Palinuridae) acoustically tracked

Crustaceana ◽

10.1163/15685403-00003893 ◽

2019 ◽

Vol 92 (4) ◽

pp. 463-476

Author(s):

Vincenzo M. Giacalone ◽

Arturo Zenone ◽

Fabio Badalamenti ◽

Javier Ciancio ◽

Gaspare Buffa ◽

...

Keyword(s):

Home Range ◽

Protected Area ◽

Marine Protected Area ◽

High Spatial Resolution ◽

Spiny Lobster ◽

Ultrasonic Telemetry ◽

Central Mediterranean ◽

In The Wild ◽

First Time ◽

Palinurus Elephas

Abstract A specific study has been carried out for the first time to investigate the homing capability and daily home range of the spiny lobster Palinurus elephas by means of ultrasonic telemetry. Nine lobsters collected in the Capo Gallo — Isola delle Femmine marine protected area (northwestern Sicily, central Mediterranean) were tagged with miniaturized transmitters and released at a single site inside the protected area. The lobsters were monitored with the purpose of calculating their horizontal and vertical positions, analysing their movement patterns to assess their homing capability, and calculating their daily home range. Five lobsters moved back close to the capture sites within the first 20 hours after release (‘homed’). The remaining four lobsters ‘relocated’ to a different refuge. Homed lobsters had a larger home range than relocated lobsters. This study provides the first description of a homing pattern with high spatial resolution in the wild European spiny lobster as inferred by ultrasonic telemetry.

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Mechanical response characteristics of the hearing organ in the low-frequency regions of the cochlea

Journal of Neurophysiology ◽

10.1152/jn.1996.76.6.3850 ◽

1996 ◽

Vol 76 (6) ◽

pp. 3850-3862 ◽

Cited By ~ 31

Author(s):

M. Ulfendahl ◽

S. M. Khanna ◽

A. Fridberger ◽

A. Flock ◽

B. Flock ◽

...

Keyword(s):

Temporal Bone ◽

Mechanical Response ◽

Low Frequency ◽

Cell Receptor ◽

Sound Stimulation ◽

Supporting Cells ◽

Tuning Curves ◽

Electrical Responses

1. With the use of an in vitro preparation of the guinea pig temporal bone, in which the apical turns of the cochlea are exposed, the mechanical and electrical responses of the cochlea in the low-frequency regions were studied during sound stimulation. 2. The mechanical characteristics were investigated in the fourth and third turns of the cochlea with the use of laser heterodyne interferometry, which allows the vibratory responses of both sensory and supporting cells to be recorded. The electrical responses, which can be maintained for several hours, were recorded only in the most apical turn. 3. In the most apical turn, the frequency locations and shapes of the mechanical and electrical responses were very similar. 4. The shapes of the tuning curves and the spatial locations of the frequency maxima in the temporal bone preparation compared very favorably with published results from in vivo recordings of hair cell receptor potentials and sound-induced vibrations of the Reissner's membrane. 5. Compressive nonlinearities were present in both the mechanical and the electrical responses at moderate sound pressure levels. 6. The mechanical tuning changed along the length of the cochlea, the center frequencies in the fourth and third turns being approximately 280 and 570 Hz, respectively. 7. The mechanical responses of sensory and supporting cells were almost identical in shape but differed significantly in amplitude radially across the reticular lamina.

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Tyrosinases from crustaceans form hexamers

Biochemical Journal ◽

10.1042/bj20021058 ◽

2003 ◽

Vol 371 (2) ◽

pp. 515-523 ◽

Cited By ~ 65

Author(s):

Elmar JAENICKE ◽

Heinz DECKER

Keyword(s):

Oxygen Carrier ◽

Spiny Lobster ◽

Physicochemical Characterization ◽

Primary Immune Response ◽

Freshwater Crayfish ◽

Astacus Leptodactylus ◽

Purification Protocol ◽

Palinurus Elephas

Tyrosinases, which are widely distributed among animals, plants and fungi, are involved in many biologically essential functions, including pigmentation, sclerotization, primary immune response and host defence. In the present study, we present a structural and physicochemical characterization of two new tyrosinases from the crustaceans Palinurus elephas (European spiny lobster) and Astacus leptodactylus (freshwater crayfish). In vivo, the purified crustacean tyrosinases occur as hexamers composed of one subunit type with a molecular mass of approx. 71kDa. The tyrosinase hexamers appear to be similar to the haemocyanins, based on electron microscopy. Thus a careful purification protocol was developed to discriminate clearly between tyrosinases and the closely related haemocyanins. The physicochemical properties of haemocyanins and tyrosinases are different with respect to electronegativity and hydrophobicity. The hexameric nature of arthropod tyrosinases suggests that these proteins were the ideal predecessors from which to develop the oxygen-carrier protein haemocyanin, with its allosteric and co-operative properties, later on.

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