Injury and Subsequent Healing of a Propeller Strike Injury to a Heaviside's Dolphin (&lt;I&gt;Cephalorhynchus heavisidii&lt;/I&gt;)

Elwen, Simon Harvey; Leeney, Ruth H.

doi:10.1578/am.36.4.2010.382

Cited by 21 publications

(21 citation statements)

References 17 publications

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“…The bay is formed by a long sand spit on the western edge ending at Pelican Point (S 22.8700°, E 14.4479°), where there is a known concentration area of Heaviside's dolphins (Elwen & Leeney, 2010). A large commercial harbour in the southeast corner of the bay (~10 km distant) supports several pelagic and demersal fishing fleets and a large marine tourism industry consisting of 25 boats, at least some of which operate in the bay on a daily basis (Elwen & Leeney, 2008).…”

Section: Methodsmentioning

confidence: 99%

“…Little is known about this species in the northern part of its range, with most ecological research to date having concentrated on populations in South Africa, which were shown to be locally abundant and have small home ranges (Elwen et al, 2006. Like other small coastal delphinids, it faces a number of threats such as coastal development, boat traffic, pollution, prey depletion, and bycatch in fisheries (Best & Abernethy, 1994;Elwen & Leeney, 2010). Populations of the congeneric Hector's and Chilean dolphins (C. hectori and C. eutropia) have been severely impacted by near-shore fishing activities (Dawson, 1991;Iñíguez et al, 2003;King & Brooks, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Using Static Acoustic Monitoring to Describe Echolocation Behaviour of Heaviside’s Dolphins (Cephalorhynchus heavisidii) in Namibia

Leeney¹,

Carslake²,

Elwen³

2011

Aquat Mamm

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Static acoustic monitoring is a cost-effective, low-effort means of gathering large datasets on echolocation click characteristics and habitat use by odontocetes. Heaviside's dolphins (Cephalorhynchus heavisidii) were monitored using an acoustic monitoring unit, the T-POD, in July 2008 at a site of known high abundance for this species in Walvis Bay, Namibia. The T-POD successfully detected clicks from Heaviside's dolphins, and these clicks were detected in the 120 to 140 kHz frequency range. A distinct diel pattern to the hourly mean inter-click interval was observed, with higher values during daylight hours than at night, suggesting that click trains are produced at faster rates at night time. There was no apparent diel pattern in the proportion of buzz trains produced, however. A diel pattern in click activity was observed, with many more detection-positive minutes per hour recorded between dusk and dawn, and vocalization activity dropping to low levels in the middle of the day. This corresponded with visual observations made on abundance of dolphins in the study area. These results suggest that Heaviside's dolphins use this site primarily during the night. Static acoustic monitoring proved to be an effective technique for monitoring patterns of habitat use by Heaviside's dolphins.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Using Static Acoustic Monitoring to Describe Echolocation Behaviour of Heaviside’s Dolphins (Cephalorhynchus heavisidii) in Namibia

Leeney¹,

Carslake²,

Elwen³

2011

Aquat Mamm

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“…Long-term or year-round studies are unavailable for the other cetacean species known to occur along this section of the South African coast and it is unknown how they are affected by human impacts. There are multiple anthropogenic threats to marine life along the southern African coast including physical changes to the coastline (Sink et al, 2012), pollution (Atkinson & Sink, 2008;Cockcroft, de Kock, Lord, & Ross, 1989;de Kock, Best, Cockcroft, & Bosma, 1994), potential establishment of nuclear power stations (Griffiths & Robinson, 2011), effects of fisheries including depletion of prey (Atkinson & Sink, 2008), entanglement in fishing gear (Atkinson & Sink, 2008;Meÿer et al, 2011), boat traffic including recreational, ecotourism, and fishing vessels (Elwen & Leeney, 2010;Meÿer et al, 2011;Turpie, Savy, Clark, & Atkinson, 2005;Waerebeek et al, 2006), and tourism in a broader sense (Sink et al, 2012). However, whereas knowledge of the abundance of animals, their distribution, genetic variability, and behavior is a basic requirement for effective conservation of species and ecosystems (Caughley & Sinclair, 1994), acquiring such data for cetaceans is difficult and costly (Redfern et al, 2006).…”

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confidence: 99%

The Use of Data from a Platform of Opportunity (Whale Watching) to Study Coastal Cetaceans On the Southwest Coast of South Africa

Vinding¹,

Bester²,

Kirkman³

et al. 2015

Tourism in Marine Environments

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Effective conservation management requires information on wildlife abundance and distribution. Platforms of opportunity, including whale-watching vessels (WWV), can provide inexpensive and valuable information particularly in data deficient areas. This study analyzed over 5,500 cetacean encounters from more than 2,500 trips over 10 years by a WWV in the Western Cape, South Africa. Results were twofold: 1) providing spatial and temporal distribution patterns of the five main cetacean species for the area (southern right, humpback, and Bryde's whales, Indo-Pacific bottlenose and Indian Ocean humpback dolphins) and the first long-term, year-round data for this area; 2) showing that regularly recorded opportunistic encounters from a WWV constitute an important source of baseline information. Caveats and limitations of data from WWV are discussed and advice regarding data collection from platforms of opportunity is provided. Particularly, the lack of effort data and of clearly defined behavioral categories is emphasized and standardization of guidelines for data collection methods worldwide is suggested.

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“…Elwen and Leeney (36) noted that some cetaceans may learn to avoid boats after a negative experience (such as a biopsy or capture) but most studies have shown that injuries do not lead to behavioral changes. Therefore, even if an animal has been struck by a boat, it will not necessarily learn to avoid boats in the future and is still at risk from further accidents.…”

Section: Discussion—the Life Of the Solitary-sociable Dolphinmentioning

confidence: 99%

A Global Reassessment of Solitary-Sociable Dolphins

Nunny¹,

Simmonds

2019

Front. Vet. Sci.

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Dolphins are typically regarded as highly social animals. However, some individuals live apart from their own species and may come to socialize with people through a recognized series of stages which are presented and expanded on in this paper. The term “solitary-sociable dolphins” has been used to describe these animals and such individuals have been identified from several different species and reported in many parts of the world. In many instances, the interactions with people that may follow their original isolation, and which typically become more intense over time, have created situations where the welfare of the animal has been compromised by disturbance, injury, the feeding of inappropriate items and aggressive human behavior. Several solitary-sociable dolphins have also been deliberately injured and killed by humans. People who interact with these dolphins may also put themselves at risk of injury. This paper reports on recent cases drawing on published and unpublished sources. Since 2008, 32 solitary dolphins have been recorded including 27 bottlenose dolphins (25 Tursiops truncatus and two Tursiops aduncus), two striped dolphins and three common dolphins. Four solitary belugas have also been recorded. There are some ten solitary dolphins and one beluga known at the present time. Laws and guidelines currently in place to protect solitary-sociable dolphins need to be strengthened and interactions with people should be avoided or, at the least, carefully managed to protect both the dolphin and the humans involved in the interaction. Terms, such as disturbance and harassment which are included in laws need to be clearly defined. Additionally, management plans for solitary-sociable dolphins need to be developed and adapted on a case by case basis taking into account the individual dolphin's sex, age, personality, stage of sociability and home range. It is also important that government officials and local stakeholders work together to implement guidelines which set out how the public can observe or interact with the dolphin safely.

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Injury and Subsequent Healing of a Propeller Strike Injury to a Heaviside's Dolphin (<I>Cephalorhynchus heavisidii</I>)

Cited by 21 publications

References 17 publications

Using Static Acoustic Monitoring to Describe Echolocation Behaviour of Heaviside’s Dolphins (Cephalorhynchus heavisidii) in Namibia

Using Static Acoustic Monitoring to Describe Echolocation Behaviour of Heaviside’s Dolphins (Cephalorhynchus heavisidii) in Namibia

The Use of Data from a Platform of Opportunity (Whale Watching) to Study Coastal Cetaceans On the Southwest Coast of South Africa

A Global Reassessment of Solitary-Sociable Dolphins

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