Monitoring the movements of harbour porpoises ( Phocoena phocoena ) with satellite telemetry

Read, Andrew J.; Westgate, Andrew J.

doi:10.1007/s002270050251

Cited by 111 publications

(103 citation statements)

References 15 publications

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“…There does not appear to be a temporally coordinated migration or a specific migratory route to and from the Bay of Fundy region. Though, during the fall, several satellite tagged harbor porpoises did favor the waters around the 92m isobath, which is consistent with observations of high rates of incidental catches in this depth range (Read and Westgate 1997). There were two stranding records from Florida (Smithsonian strandings data base).…”

Section: Stock Definition and Geographic Rangesupporting

confidence: 88%

A Framework for Monitoring and Assessing Socioeconomics and Governance of Large Marine Ecosystems1 1First published by Sutinen et al. in 2000: NOAA Technical Memorandum, NMFS-NE-158 (under contract # ENN F7 00378)

Sutinen¹,

Dyer²,

Edwards³

et al. 2005

Sustaining Large Marine Ecosystems - The Human Dimension

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Section: Stock Definition and Geographic Rangesupporting

confidence: 88%

A Framework for Monitoring and Assessing Socioeconomics and Governance of Large Marine Ecosystems1 1First published by Sutinen et al. in 2000: NOAA Technical Memorandum, NMFS-NE-158 (under contract # ENN F7 00378)

Sutinen¹,

Dyer²,

Edwards³

et al. 2005

Sustaining Large Marine Ecosystems - The Human Dimension

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“…Only 2 previous studies of satellite-tagged harbour porpoises were able to show seasonal movements, possibly also linked to changes in prey distribution (Read & Westgate 1997, Sveegaard et al 2012a. Sveegaard et al (2011a, p. 241-242) emphasized, however, that the observed seasonal movement patterns were not temporally coordinated migrations, but rather 'a seasonal change in im portance of some […] areas' and 'a gradual overall movement over a longer period'.…”

Section: Seasonal Occurrence and Trends In Harbour Porpoise Presencementioning

confidence: 96%

Baltic Sea harbour porpoise populations: status and conservation needs derived from recent survey results

Benke¹,

Bräger²,

Dähne³

et al. 2014

Mar. Ecol. Prog. Ser.

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During recent decades, the 2 distinct harbour porpoise populations of the Baltic Sea have decreased sharply in abundance. The Baltic Proper population is down to a few hundred individuals and is regarded as 'Critically Endangered' by IUCN; the more abundant Belt Sea population also appears to have experienced a severe decline. We summarize the results of extensive static acoustic monitoring in the German part of the Baltic Sea and compare them to published results of aerial and acoustic surveys. Acoustic monitoring confirmed seasonal changes in detection rates consistent with proposed east -west migrations. Detection rates, and thus presumably porpoise density, decrease from west to east from a long-term mean ( in Kadet Trench to 4.4% DPD mo −1 in Pomeranian Bay as one crosses the putative population boundary. Acoustic monitoring results show a recent increase in porpoise registration rates in the Kadet Trench and in Pomeranian Bay, although this does not necessarily indicate a population increase. This large dataset supports the previously suggested proposition that each population uses the boundary waters in Pomeranian Bay alternately, leading to the presence of registration peaks in (late) summer by Belt Sea porpoises, and in winter by Baltic Proper animals. The critical status of porpoises in the Baltic Sea highlights the urgent need for protective measures which still await national and international implementation.

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“…Gifford et al 2007;Read and Westgate 1997), seals (e.g. Call et al 2007;Matthiopoulos et al 2004), marine turtles (e.g.…”

Section: Introductionmentioning

confidence: 99%

Flow simulation along a seal: the impact of an external device

Hazekamp

Mayer²,

Osinga

2009

Eur J Wildl Res

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An increasing number of marine mammal studies on physiology, behaviour and ecology rely on data, which have been collected from back-mounted devices, such as bio-logging tags and satellite transmitters. However, external devices may influence an animal's hydrodynamics, behaviour and energy expenditure and, therefore, can impede the individual animal. To investigate the influence of external devices on seals, the water flow along a grey seal was simulated using computational fluid dynamics calculations. The simulations revealed several changes in forces and moments and thus balance, due to this device. The investigated satellite transmitter creates an average 12% increase of the drag coefficient. Additionally, there are significant relative transmitter-induced increases in pitching moment (32%) and lift (240%). The simulations also showed that the transmitter generates areas of decreased wall shear stress on the seal's back. The results of this study demonstrate that external devices can change the hydrodynamics of the seal, which is expected to alter the seal's physiology and behaviour and its use of the ecosystem. Long-term attachment may have adverse effects on the animal's welfare. It is important to take these effects into consideration when studying tagged seals; otherwise, the value of the data obtained will be poor. Therefore, interpretations and extrapolations regarding 'natural behaviour' of animals in their 'natural environment' should only be made with great caution.

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Monitoring the movements of harbour porpoises ( Phocoena phocoena ) with satellite telemetry

Cited by 111 publications

References 15 publications

A Framework for Monitoring and Assessing Socioeconomics and Governance of Large Marine Ecosystems1 1First published by Sutinen et al. in 2000: NOAA Technical Memorandum, NMFS-NE-158 (under contract # ENN F7 00378)

A Framework for Monitoring and Assessing Socioeconomics and Governance of Large Marine Ecosystems1 1First published by Sutinen et al. in 2000: NOAA Technical Memorandum, NMFS-NE-158 (under contract # ENN F7 00378)

Baltic Sea harbour porpoise populations: status and conservation needs derived from recent survey results

Flow simulation along a seal: the impact of an external device

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