In cold blood: evidence of Pacific sleeper shark (Somniosus pacificus) predation on Steller sea lions (Eumetopias jubatus) in the Gulf of Alaska

Horning, Markus; Mellish, Jo Ann E.

doi:10.7755/fb.112.4.6

Cited by 27 publications

(42 citation statements)

References 46 publications

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“…From these observations, the authors derived a 45-day postoperative survival study inclusion criterion. All 49 otariids had survival confirmed beyond the 45-day postoperative study inclusion criterion, whether released after one, two or up to eight weeks following surgery [49,57]. These studies also demonstrated that transmitter implantation has no detectable effect on postrelease movement and diving behavior as compared to animals that also underwent temporary captivity but without LHX tag implants [57].…”

Section: Life-long Implanted Vital Rate Transmitterssupporting

confidence: 49%

“…No differences in survival patterns between implanted animals and nonimplanted controls were detectable between the ages of 14 months to five years [65]. From the ratio of dual-to single-tag data returns in 20 mortalities detected to date (through 2016) and in 10 dual-tag carcass simulations, data return probability was estimated at >0.98 [49]. Of the 17 female Steller sea lions in that study implanted with single (n = 1 animal) or dual tags (n = 16 animals) between 2005 and 2014, eight animals have died by predation [49], and nine remain alive.…”

Section: Life-long Implanted Vital Rate Transmittersmentioning

confidence: 99%

“…From the ratio of dual-to single-tag data returns in 20 mortalities detected to date (through 2016) and in 10 dual-tag carcass simulations, data return probability was estimated at >0.98 [49]. Of the 17 female Steller sea lions in that study implanted with single (n = 1 animal) or dual tags (n = 16 animals) between 2005 and 2014, eight animals have died by predation [49], and nine remain alive. Of these, only three have reached a reproductive age.…”

Section: Life-long Implanted Vital Rate Transmittersmentioning

confidence: 99%

“…1, 33 mm diameter, 97 mm length, 79 ml volume, 54 g mass, 0.26 N buoyancy) and can be programmed to evaluate temperature patterns for parturition events. LHX tags can be used to determine date, location and causes of mortality [49,55], and also age at primiparity and lifetime number of pups born if deployed in pre-parous females.…”

Section: Life-long Implanted Vital Rate Transmittersmentioning

confidence: 99%

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Best practice recommendations for the use of fully implanted telemetry devices in pinnipeds

et al. 2017

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Electronic telemetry devices have enabled many novel and important data collection and experimental opportunities for difficult to observe species. Externally attached devices have limited retention and may affect thermoregulation, energetics, social and reproductive behavior, visibility, predation risk and entanglement. Internally placed, surgically implanted devices can mitigate some of these effects and may open additional experimental opportunities. However, improper implementation can significantly affect animals and data. From a review of recent studies using fully implanted tags and studying their effects, we present 15 specific best practice recommendations for the use of such tags in pinnipeds. Recommendations address issues including device size, coating and sterilization, implantation surgery and effect assessment, within the framework of the Three R's: Reduction, Refinement, Replacement. While developed for pinnipeds, these recommendations could apply to other aquatic mammals and vertebrates and to partially implanted or even external tags.

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Section: Life-long Implanted Vital Rate Transmitterssupporting

confidence: 49%

Section: Life-long Implanted Vital Rate Transmittersmentioning

confidence: 99%

Section: Life-long Implanted Vital Rate Transmittersmentioning

confidence: 99%

Section: Life-long Implanted Vital Rate Transmittersmentioning

confidence: 99%

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Best practice recommendations for the use of fully implanted telemetry devices in pinnipeds

et al. 2017

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“…The end-point of tracking data can reveal important information about the fate of that tracked animal. For example, bio-logging data in animals as diverse as raptors and eels can provide evidence that individuals have died [75,76] and so tags might therefore be able to assess mortality rates through space and time [77,78] as is commonly done for terrestrial species using tags equipped with mortality switches [79].…”

Section: Discussionmentioning

confidence: 99%

Key Questions in Marine Megafauna Movement Ecology

Hays

Ferreira

Sequeira

et al. 2016

Trends in Ecology & Evolution

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389

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Origins of the Greenland shark (Somniosus microcephalus): Impacts of ice‐olation and introgression

Walter

Roy

Hussey

et al. 2017

Ecology and Evolution

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Herein, we use genetic data from 277 sleeper sharks to perform coalescent‐based modeling to test the hypothesis of early Quaternary emergence of the Greenland shark (Somniosus microcephalus) from ancestral sleeper sharks in the Canadian Arctic‐Subarctic region. Our results show that morphologically cryptic somniosids S. microcephalus and Somniosus pacificus can be genetically distinguished using combined mitochondrial and nuclear DNA markers. Our data confirm the presence of genetically admixed individuals in the Canadian Arctic and sub‐Arctic, and temperate Eastern Atlantic regions, suggesting introgressive hybridization upon secondary contact following the initial species divergence. Conservative substitution rates fitted to an Isolation with Migration (IM) model indicate a likely species divergence time of 2.34 Ma, using the mitochondrial sequence DNA, which in conjunction with the geographic distribution of admixtures and Pacific signatures likely indicates speciation associated with processes other than the closing of the Isthmus of Panama. This time span coincides with further planetary cooling in the early Quaternary period followed by the onset of oscillating glacial‐interglacial cycles. We propose that the initial S. microcephalus–S. pacificus split, and subsequent hybridization events, were likely associated with the onset of Pleistocene glacial oscillations, whereby fluctuating sea levels constrained connectivity among Arctic oceanic basins, Arctic marginal seas, and the North Atlantic Ocean. Our data demonstrates support for the evolutionary consequences of oscillatory vicariance via transient oceanic isolation with subsequent secondary contact associated with fluctuating sea levels throughout the Quaternary period—which may serve as a model for the origins of Arctic marine fauna on a broad taxonomic scale.

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In cold blood: evidence of Pacific sleeper shark (Somniosus pacificus) predation on Steller sea lions (Eumetopias jubatus) in the Gulf of Alaska

Abstract: Abstract-Temperature data received post mortem in

Cited by 27 publications

References 46 publications

Best practice recommendations for the use of fully implanted telemetry devices in pinnipeds

Best practice recommendations for the use of fully implanted telemetry devices in pinnipeds

Key Questions in Marine Megafauna Movement Ecology

Origins of the Greenland shark (Somniosus microcephalus): Impacts of ice‐olation and introgression

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