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Peter Gaube

Principal Oceanographer

Email

pgaube@apl.washington.edu

Phone

206-616-0611

Education

B.A. Ecology and Evolutionary Biology, University of Arizona, 2003

M.S. Physical Oceanography, Nova Southeastern University, 2007

Ph.D. Oceanography, Oregon State University, 2012

Peter Gaube's Website

http://gaubelab.org

Publications

2000-present and while at APL-UW

Global satellite-observed daily vertical migrations of ocean animals

Behrenfeld, M.J., P. Gaube, A. Della Penna, R.T. O'Malley, W.J. Burt, Y. Hu, P.S. Bontempi, D.K. Steinberg, E.S. Boss, D.A. Siegel, C.A. Hostetler, P.D. Torfell, and S.C. Doney, "Global satellite-observed daily vertical migrations of ocean animals," Nature, EOR, doi:10.1038/s41586-019-1796-9, 2019.

More Info

27 Nov 2019

Every night across the world's oceans, numerous marine animals arrive at the surface of the ocean to feed on plankton after an upward migration of hundreds of metres. Just before sunrise, this migration is reversed and the animals return to their daytime residence in the dark mesopelagic zone (at a depth of 200–1,000 m). This daily excursion, referred to as diel vertical migration (DVM), is thought of primarily as an adaptation to avoid visual predators in the sunlit surface layer and was first recorded using ship-net hauls nearly 200 years ago. Nowadays, DVMs are routinely recorded by ship-mounted acoustic systems (for example, acoustic Doppler current profilers). These data show that night-time arrival and departure times are highly conserved across ocean regions and that daytime descent depths increase with water clarity, indicating that animals have faster swimming speeds in clearer waters. However, after decades of acoustic measurements, vast ocean areas remain unsampled and places for which data are available typically provide information for only a few months, resulting in an incomplete understanding of DVMs. Addressing this issue is important, because DVMs have a crucial role in global ocean biogeochemistry. Night-time feeding at the surface and daytime metabolism of this food at depth provide an efficient pathway for carbon and nutrient export.

Here we use observations from a satellite-mounted light-detection-and-ranging (lidar) instrument to describe global distributions of an optical signal from DVM animals that arrive in the surface ocean at night. Our findings reveal that these animals generally constitute a greater fraction of total plankton abundance in the clear subtropical gyres, consistent with the idea that the avoidance of visual predators is an important life strategy in these regions. Total DVM biomass, on the other hand, is higher in more productive regions in which the availability of food is increased. Furthermore, the 10-year satellite record reveals significant temporal trends in DVM biomass and correlated variations in DVM biomass and surface productivity. These results provide a detailed view of DVM activities globally and a path for refining the quantification of their biogeochemical importance.

Mesoscale eddies release pelagic sharks from thermal constraints to foraging in the ocean twilight zone

Braun, C.D., P. Gaube, T.H. Sinclair-Taylor, G.B. Skomal, and S.R. Thorrold, "Mesoscale eddies release pelagic sharks from thermal constraints to foraging in the ocean twilight zone," Proc. Nat. Acad. Sci. USA, 116, 17,187-17,192, doi:10.1073/pnas.1903067116, 2019.

More Info

6 Aug 2019

Mesoscale eddies are critical components of the ocean’s "internal weather" system. Mixing and stirring by eddies exerts significant control on biogeochemical fluxes in the open ocean, and eddies may trap distinctive plankton communities that remain coherent for months and can be transported hundreds to thousands of kilometers. Debate regarding how and why predators use fronts and eddies, for example as a migratory cue, enhanced forage opportunities, or preferred thermal habitat, has been ongoing since the 1950s. The influence of eddies on the behavior of large pelagic fishes, however, remains largely unexplored. Here, we reconstruct movements of a pelagic predator, the blue shark (Prionace glauca), in the Gulf Stream region using electronic tags, earth-observing satellites, and data-assimilating ocean forecasting models. Based on >2,000 tracking days and nearly 500,000 high-resolution time series measurements collected by 15 instrumented individuals, we show that blue sharks seek out the interiors of anticyclonic eddies where they dive deep while foraging. Our observations counter the existing paradigm that anticyclonic eddies are unproductive ocean "deserts" and suggest anomalously warm temperatures in these features connect surface-oriented predators to the most abundant fish community on the planet in the mesopelagic. These results also shed light on the ecosystem services provided by mesopelagic prey. Careful consideration will be needed before biomass extraction from the ocean twilight zone to avoid interrupting a key link between planktonic production and top predators. Moreover, robust associations between targeted fish species and oceanographic features increase the prospects for effective dynamic ocean management.

Movement ecology and stenothermy of satellite-tagged shortbill spearfish (Tetrapturus angustirostris)

Arostegui, M.C., P. Gaube, and C.D. Braun, "Movement ecology and stenothermy of satellite-tagged shortbill spearfish (Tetrapturus angustirostris)," Fish. Res., 215, 21-25, doi:10.1016/j.fishres.2019.03.005, 2019.

More Info

1 Jul 2019

The shortbill spearfish (Tetrapturus angustirostris) is an understudied, istiophorid billfish primarily encountered as bycatch in pelagic commercial fisheries of the Indo-Pacific. The species is listed as data-deficient, and little is known of its biology, ecology, and population structure or status. We assessed the species' movement ecology and thermal niche with telemetry data from the first shortbill spearfishes ever outfitted with pop-up satellite archival transmitting tags (n = 3 with successfully transmitted data). Short (4–15 day) deployments offshore of the Island of Hawai'i revealed that spearfish primarily occupied the mixed layer, spending >90% of each 24-hr period between the surface and 100 m in water temperatures between 24–26°C. These individuals consistently exhibited vertical activity at night regardless of the prevailing lunar phase. Nocturnal movements throughout the mixed layer may enable shortbill spearfish to forage on mesopelagic species undergoing diel vertical migration and reduce trophic niche overlap with primarily diurnal, pelagic species. The narrow thermal distribution of shortbill spearfish in this study, almost exclusively within 2°C of sea surface temperature, suggests that they are more stenothermal than extra-generic istiophorid species.

More Publications

In The News

Swordfish as oceanographers? Satellite tags allow research of ocean's 'twilight zone' off Florida

UW News, Hannah Hickey

Researchers from the University of Washington are using high-tech tags to record the movements of swordfish – big, deep-water, migratory, open-ocean fish that are poorly studied – and get a window into the ocean depths they inhabit.

4 Nov 2019

Why great white sharks hang out in warm whirlpools

National Geographic, Douglas Main

New research on famous white sharks Mary Lee and Lydia shows the giant fish spend a surprising amount of time in warm oceanic eddies.

19 Jun 2018

Great white sharks dive deep into warm-water whirlpools in the Atlantic

UW News, Hannah Hickey

A study from the University of Washington and Woods Hole Oceanographic Institution looked at the movements of adult female white sharks in the Gulf Stream and North Atlantic Ocean. Results showed, surprisingly, that they prefer warm-water eddies — the clockwise-spinning whirlpools in the ocean — and tend to spend more time deep inside these slowly spinning features.

18 Jun 2018

More News Items

Inventions

Continuous Underway Multi-sensor Profiler

Record of Invention Number: 48207

Peter Gaube, Kyla Drushka

Disclosure

15 Nov 2017

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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