An inexpensive depth gauge for marine animals

Wilson, Rory P.; Burger, Alan E.; Wilson, B. L. H.; Wilson, Maria; Nöldeke, C.

doi:10.1007/bf00543358

Cited by 13 publications

(10 citation statements)

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“…Values were stored on computer and then corrected for the light spread function and converted to time-at-depth values using an iterative deconvolution program. This approach gives errors in time estimates of less than 14%, while errors in depth estimates are better than 10% over the depth range considered (Wilson et al 1989a).…”

Section: Methodsmentioning

confidence: 92%

“…Piston position is recorded by selective exposure of the film to the light-emitting diode. In addition, since the optical density of the developed film is a function of exposure time, it is possible to recalculate the total time that the piston has spent at particular positions, i.e., how long the device has spent at different depths (Wilson et al 1989a). Analysis of the film necessitates a series of time/depth calibrations and corrects for potential errors due to the spread function of the light by multiple iterative deconvolution.…”

Section: Methodsmentioning

confidence: 99%

“…Analysis of the film necessitates a series of time/depth calibrations and corrects for potential errors due to the spread function of the light by multiple iterative deconvolution. Full details of this procedure and of device construction and deployment are given in Wilson et al (1989a).…”

Section: Methodsmentioning

confidence: 99%

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Depth utilisation by breeding Ad�lie penguins,Pygoscelis adeliae, at Esperanza Bay, Antarctica

Wilson¹,

Culik²,

Adelung³

et al. 1991

Mar. Biol.

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Abstract. Miniature depth gauges were attached inDecember 1987 and January 1988 to Ad61ie penguins, Pygoscelis adeliae, breeding at Esperanza on the Antarctic Peninsula. Results from 34 birds showed that foraging penguins with eggs and with brooded and cr6ching chicks spent mean periods away from the nest of 96, 36 and 21 h, respectively, during which time means of 29.0 h (30%), 11.2 h (31%) and 2.7 h (13%), respectively, were spent under water at depths > 5 m. Time under water was positively correlated with time absent from nest. Maximum depth reached was 170 m but overall birds spent most time at shallower depths. Birds foraging for brooded chicks dived deeper than birds foraging for cr6ching chicks. Stomach-pumping indicated that the principal prey caught at this time was krill, Euphausia superba.Mean mass changes of adults during single foraging trips indicated that krill were caught at a mean rate of 7.2 g min-1 spent under water.Wilson's analysis was, however, only intended to determine gross depth-utilisation differences between sympatric Pygoscelis species, and no details on intra-specific differences were presented.We analysed results derived from depth gauges used on Ad61ie penguins breeding in Antarctica during December 1987 and January 1988. This includes a detailed re-analysis of data already presented (Wilson 1989) in addition to new data from other birds not included in the time span of Wilson's study. In this paper we consider depth utilisation by Ad~lie penguins during the course of a breeding season and present a model to attempt to determine prey capture rate by these birds. Such studies can help define the foraging niche of Ad61ie penguins. In addition, examination of temporal variability in Ad61ie penguin depth utilisation and foraging effort might lead to insights regarding the vertical distribution and local abundance of their prey, Antarctic krill.

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Section: Methodsmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

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Depth utilisation by breeding Ad�lie penguins,Pygoscelis adeliae, at Esperanza Bay, Antarctica

Wilson¹,

Culik²,

Adelung³

et al. 1991

Mar. Biol.

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“…2a). This specific approach was only ever used on the African penguin Spheniscus demersus (Wilson 1985), but it spawned the development of depth gauges using light on film rather than radio activity (Wilson et al 1989) (Fig. 2b).…”

Section: In-depth View Of Seabird Foragingmentioning

confidence: 99%

“…2. Four different generations of timedepth recorders used on sea birds: (a) a capillary depth gauge modified so that a radioactive bead exposes film (Wilson & Bain 1984); (b) a modified syringe fitted with light-emitting diode to expose film (Wilson et al 1989); (c) a compressible bellows system attached to stylus scribing on a rotating drum (Naito et al 1990 1924 (Dewar 1924), as was, later, the relationship between dive duration and surface pause (e.g. Cooper 1986).…”

Section: In-depth View Of Seabird Foragingmentioning

confidence: 99%

Technological innovation in archival tags used in seabird research

Wilson¹,

Vandenabeele²

2012

Mar. Ecol. Prog. Ser.

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The first archival tags were used on seabirds in the 1960s. Since that time, when recording systems were primitive, various technological advances, culminating in solid state devices, have provided the seabird research community with extraordinarily sophisticated and powerful tags. This work documents the progress and development of archival tags used on seabirds. Major advances and the insights that these have provided into seabird behavioural ecology are highlighted, followed by an examination of the current limitations to our ability to study seabird ecology and speculation on what the future will bring to this exciting and dynamic field.

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