Measurement of ocean temperatures using instruments carried by Antarctic fur seals

Boyd, Ian L.; Hawker, Elizabeth J.; Brandon, Mark A.; Staniland, Iain J.

doi:10.1016/s0924-7963(00)00073-7

Cited by 22 publications

(13 citation statements)

References 18 publications

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“…In fact, one juvenile female was shown to dive differently within the structure of the eddy versus in other frontal zones (Campagna et al 2006). The sub-surface structure of the water column and its relation to diving and foraging behaviour is an exciting area for future research, especially as some positive results have been obtained for diving behaviour in relation to thermocline depth in southern elephant seals (Boyd & Arnbom 1991), Antarctic fur seals Arctocephalus gazella (Boyd et al 2001), California sea lions Zalophus californianus (M. J. Weise unpubl. data) and king penguins Aptenodytes patagonicus (Charrassin & Bost 2001), to name a few.…”

Section: Ffas In Relation To Oceanographymentioning

confidence: 99%

Linking foraging behaviour of the northern elephant seal with oceanography and bathymetry at mesoscales

Simmons¹,

Crocker²,

Kudela³

et al. 2007

Mar. Ecol. Prog. Ser.

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We examined the foraging behaviour of 12 adult female northern elephant seals in relation to mesoscale oceanographic features between 1995 and 1997. Females were divided into 3 groups based on the geographic region to which they migrated ('coastal', 'coastal-oceanic' and 'oceanic'). We defined focal foraging areas (FFAs) using satellite telemetry and average daily transit rates of ≤0.4 m s -1, and examined characteristics of FFAs with respect to sea surface temperature (SST), sea surface temperature gradient (SSTg), sea level anomaly (SLA) and bathymetry using logistic regression models. Shallow bathymetry was significant for the coastal grouping of females and we examined the prevalence of benthic dives using a dive index ratio (DI), calculated by dividing mean maximum dive depth (m) by ocean depth (m) at each location for all 12 females. An additional 6 adult males were included in this analysis to quantify and elucidate differences in benthic foraging mode between the sexes. DI comparisons revealed significantly greater prevalence of benthic diving in FFAs in males than females (χ 2 = 10.588, p < 0.01). However, one coastal female did show a higher occurrence of benthic dives in FFAs than other females, and had significantly greater rates of mass gain. The importance of each oceanographic variable differed between the 3 groups of females. Overall, model results showed SST to be the most influential factor related to FFAs. Additionally, 6 females had FFAs that were characterised by greater SSTg and higher SLA. These characteristics are consistent with anti-cyclonic eddies that occur throughout the range of elephant seals. Semipermanent eddies, such as the Haida and Sitka eddies of the Alaska gyre, may be particularly important in determining FFAs for some female northern elephant seals.

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Section: Ffas In Relation To Oceanographymentioning

confidence: 99%

Linking foraging behaviour of the northern elephant seal with oceanography and bathymetry at mesoscales

Simmons¹,

Crocker²,

Kudela³

et al. 2007

Mar. Ecol. Prog. Ser.

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“…The analysis of the behaviour of marine mammal and avian predators in relation to the physical, chemical and biological structure of the oceans is becoming the focus of marine ecologists and oceanographers alike (McConnell et al, 1992;McCafferty et al, 1998McCafferty et al, , 1999Tynan, 1998;Bornemann et al, 2000;Campagna et al, 2000;Georges et al, 2000;Nicol et al, 2000;Boyd et al, 2001;Field et al, 2001;Guinet et al, 2001;Bradshaw et al, 2002). It is generally believed that top predators such as marine mammals and birds use regions of higher biological productivity to supply sufficient food for survival and reproductive output (McConnell et al, 1992;Tynan, 1998;Nicol et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have investigated how the distribution, behaviour and reproductive performance of higher predators may be linked to physical features such as thermal structure (Brown and Winn, 1989;Hull et al, 1997;Campagna et al, 2000;Georges et al, 2000;Boyd et al, 2001;Guinet et al, 2001;Field et al, 2001), ocean colour (from which phytoplankton concentration can be estimated - Barale, 1991) Hull et al, 1997;Guinet et al, 2001), currents, frontal zones, eddies and gyres (Haney and McGillivary, 1985;Bost et al, 1992;Sims and Quayle, 1998;Tynan, 1998;Nicol et al, 2000), sea-ice extent (Bornemann et al, 2000), and bathymetry (McConnell et al, 1992;Hull et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Boyd et al (2001) also investigated the degree of correlation between sea surface temperatures recorded by archival tags deployed on Antarctic fur seals (Arctocephalus gazella) and shiptowed recorders on the one hand and remotely sensed (satellite) data on the other and found that the correlation with ship-towed methods varied with spatial scale. However, no correlation changes were observed for the relationship between measurements derived from archival tags and satellite-measured sea surface temperatures.…”

Section: Introductionmentioning

confidence: 99%

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The optimal spatial scale for the analysis of elephant seal foraging as determined by geo-location in relation to sea surface temperatures

Bradshaw

Hindell

Michael

et al. 2002

ICES Journal of Marine Science

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The optimal spatial scale for the analysis of elephant seal foraging as determined by geo-location in relation to sea surface temperatures. -ICES Journal of Marine Science, 59: 770-781.There is increasing emphasis put on the correlation of marine predator behaviour and foraging performance with the bio-physical properties of the ocean environment. However, spatial error in the estimated position of animals and the accuracy of interpolated, physical oceanographic data require the assessment of the appropriate spatial resolution at which to assess relationships. We recorded surface temperature data from 17 archival tags attached to female southern elephant seals at Macquarie Island during the post-lactation foraging trip of 1999-2000. Archival-tag temperature data were associated with twice-daily, at-sea positions derived from light levels (i.e., ''geo-location''). We compared these surface temperatures and their associated spatial error to satellite-derived Multi-Channel Sea Surface Temperature (MCSST) data to assess at what spatial scale the agreement between the two data sources was highest. We considered scales from 50 50 km through to 500 500 km grid cells, at 50 50 km increments. Averaged over all individuals and assessed in fortnightly time periods, we found a peak in agreement between the mean surface temperature recorded by the archival tags and the MCSST data at 350 350 km grid cells (122 500 km 2 ). We used logistic regression model selection to examine the effects of spatial scale, time period, latitude, longitude, and MCSST variance per grid cell on the agreement between the data sources. The most parsimonious model included all main effects, and a significant interaction between time period and latitude. There was also a trend for reduced agreement at higher latitudes, and there was a peak in temperature agreement in the general region around 180 longitude. There were two peaks in agreement during the early and latter parts of the post-lactation foraging trip, resulting probably from the more northerly latitudes travelled during these times and the improved MCSST coverage in the summer months. The 350 350 km scale recommended by this study should be appropriate for the study of coarse-scale associations between marine predators located using geo-location and physical oceanographic data during summer. However, the approach remains valid for predators located at sea using other positioning methods.

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“…Charrassin and F. Roquet (3) , C. Guinet (4) , M. Meredith, K. Nicholls and S. Thorpe (5) , D. P. Costa (6) , B. Block (7) , M. Hammill and G. Stenson (8) , M. Muelbert (9) , M. N. Bester (10) , J. Plötz and H. Bornemann (11) , M. Hindell (12) , S. Rintoul (13) , P. Lovell and M. A Fedak ( …”

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confidence: 99%

Biologging in the Global Ocean Observing System

Boehme¹,

Kovacs²,

Lydersen³

et al. 2010

Proceedings of OceanObs'09: Sustained Ocean Observations and Information for Society

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Miniature electronic data recorders and transmitters have revolutionized the way we study animals over the past decades, particularly marine animals at sea. But, very recently, animal-borne instruments have also been designed and implemented that provide in situ hydrographic data from parts of the oceans where little or no other data are currently available (even from beneath the ice in polar regions). Ocean data is delivered from animal-borne instruments via satellites in near real-time, which would enrich the Global Ocean Observing System if animal-borne instruments were deployed systematically. In the last 10 years, studies involving more than 10 countries

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Measurement of ocean temperatures using instruments carried by Antarctic fur seals

Cited by 22 publications

References 18 publications

Linking foraging behaviour of the northern elephant seal with oceanography and bathymetry at mesoscales

Linking foraging behaviour of the northern elephant seal with oceanography and bathymetry at mesoscales

The optimal spatial scale for the analysis of elephant seal foraging as determined by geo-location in relation to sea surface temperatures

Biologging in the Global Ocean Observing System

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