Manatees, Bioacoustics and Boats

Gerstein, Edmund

doi:10.1511/2002.2.154

Cited by 33 publications

(19 citation statements)

References 5 publications

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“…Gerstein (Gerstein, 2002) presents data from recordings of two boat passes at different speeds and argues that manatees may be less able to detect slow-moving boats compared with fast-moving boats, and suggests that boat impacts may be caused to slow-moving boats. However, most documented boat strikes on manatees are due to fast-moving boats (Calleson and Frohlich, 2007).…”

Section: Discussionmentioning

confidence: 99%

Audiogram and auditory critical ratios of two Florida manatees (Trichechus manatus latirostris)

Gaspard

Bauer

Reep

et al. 2012

Journal of Experimental Biology

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This Corrigendum relates to J. Exp. Biol. 215, 1442-1447 The authors misunderstood JEB's policies on citing non-peer-reviewed literature, and failed to cite the dissertation of Gerstein (Gerstein, 1999), who also measured critical ratios in two captive manatees.Gerstein measured critical ratios using both pulsed and continuous (4s) tones in the presence of 1/3-octave wide masking noise using two different noise levels. The critical ratios were lower for the pulsed tones than the continuous tone. Although we did not test the same frequencies, our measurements of critical ratios in two other manatees were similar or lower for similar test frequencies for the continuous tone. For example, we measured critical ratios from two manatees at 4kHz of 30.8 and 29.9dB, while Gerstein measured critical ratios at 3kHz of 31 and 34dB. At 16kHz we measured critical ratios of 27.0 and 28.1dB, while Gerstein measured critical ratios of 38 and 42dB at 18kHz. The results Gerstein obtained for the pulsed tones were closer to the critical ratios we measured with the 1s tone.

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Section: Discussionmentioning

confidence: 99%

Audiogram and auditory critical ratios of two Florida manatees (Trichechus manatus latirostris)

Gaspard

Bauer

Reep

et al. 2012

Journal of Experimental Biology

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“…Unless migrating, speed and thrust are less important to the manatee that has very few threats outside of humans (Reynolds and Odell, 1991;Gerstein, 2002;Reynolds and Powell, 2002;Rommel et al, 2007). The majority of their daily activities involve feeding on sessile aquatic plants and resting (Hartman, 1979;Best, 1981;Bengston, 1983;Etheridge et al, 1985;Marshall et al, 2000).…”

Section: T Kojeszewski and F E Fishmentioning

confidence: 99%

Swimming kinematics of the Florida manatee (Trichechus manatus latirostris): hydrodynamic analysis of an undulatory mammalian swimmer

Kojeszewski

Fish

2007

Journal of Experimental Biology

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SUMMARY The submerged swimming of the Florida manatee (Trichechus manatus latirostris), a subspecies of the West Indian manatee, was studied by filming individuals as they swam rectilinearly in a large pool at several rehabilitation centers. The swimming was analyzed using videography to detail the kinematics in conjunction with a hydromechanical model to determine the power output (Pt) and propulsive efficiency(ηp). Manatees swam at velocities of 0.06–1.14 m s–1. Locomotion was accomplished by undulation of the body and caudal fluke. Undulatory locomotion is a rapid and relatively high-powered propulsive mode involved in cruising and migrating by a variety of swimmers. Manatees displayed an undulatory swimming mode by passing a dorso-ventrally oriented traveling wave posteriorly along the body. The propulsive wave traveled at a higher velocity than the forward velocity of the animal. The frequency of the propulsive cycle (f) increased linearly with increasing swimming velocity (U). Amplitude at the tip of the caudal fluke (A) remained constant with respect to U and was 22% of body length. Pt increased curvilinearly with U. The mean ηp, expressing the relationship of the thrust power generated by the paddle-shaped caudal fluke to the total mechanical power, was 0.73. The maximum ηp was 0.82 at 0.95 m s–1. Despite use of a primitive undulatory swimming mode and paddle-like fluke for propulsion, the manatee is capable of swimming with a high efficiency but lower power outputs compared with the oscillatory movements of the high-aspect ratio flukes of cetaceans. The swimming performance of the manatee is in accordance with its habits as an aquatic grazer that seasonally migrates over extended distances.

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“…When this takes place during foraging, estuarine dolphins move to deeper waters, where the sound of rain is not so strong. This hypothesis can be corroborated by a study carried out with the manatee, Trichechus manatus (Linnaeus, 1758), in Florida, where the average sound in the environment is generally of 70 decibels, but can reach 90 decibels when a light rain is falling (GERSTEIN 2002).…”

Section: Revista Brasileira Dementioning

confidence: 80%

“…The negative correlation between the average number of estuarine dolphins and the pluviometric index may indicate that the sound of rain hitting the water could mask their whistles, making communication between these animals difficult, by comprising a similar sound frequency (GERSTEIN 2002, PIVARI & ROSSO 2005. When this takes place during foraging, estuarine dolphins move to deeper waters, where the sound of rain is not so strong.…”

Section: Revista Brasileira Dementioning

confidence: 99%

The influence of seasonality, tide and time of activities on the behavior of Sotalia guianensis (Van Bénéden) (Cetacea, Delphinidae) in Pernambuco, Brazil

Araújo

Souto

et al. 2007

Rev. Bras. Zool.

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Data on Sotalia guianensis Van Bénéden, 1864 occurrence on the beaches of Pernambuco (Northeastern Brazil) is restricted to information on stranding and on printed material from local newspapers; actual observations of such animals have not been published. This study intends to determine the use of habitat, behavioral activities and assess the relationships between environmental factors and the recorded behavior. Observations were conducted on open sea coastal areas, on the beaches of Olinda and Piedade, as well as in sheltered areas, in the ports of Recife and Suape. Monitoring was carried out every month in each area, during two consecutive days, from September 2004 to August 2005. Results corroborate that this species prefers to occupy more protected environments, the port of Recife being the main concentration area for such species. Piedade is just an exploratory area, possibly due to shark occurrence. Olinda is only occasionally used. Concentration areas seem to be used for feeding, and incidence of caudal exhibition suggests that most of the estuarine dolphin prey items are demersal. Environmental conditions (seasonality, tide and time) did not show to be significant when related to the estuarine dolphin behavior.

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Manatees, Bioacoustics and Boats

Cited by 33 publications

References 5 publications

Audiogram and auditory critical ratios of two Florida manatees (Trichechus manatus latirostris)

Audiogram and auditory critical ratios of two Florida manatees (Trichechus manatus latirostris)

Swimming kinematics of the Florida manatee (Trichechus manatus latirostris): hydrodynamic analysis of an undulatory mammalian swimmer

The influence of seasonality, tide and time of activities on the behavior of Sotalia guianensis (Van Bénéden) (Cetacea, Delphinidae) in Pernambuco, Brazil

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