Multi-decade northward shift of loggerhead sea turtle pelagic habitat as the eastern North Pacific Transition Zone becomes more oligotrophic

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 11

Published: Jan. 22, 2025

The North Pacific Transition Zone (NPTZ) is known as a global marine hotspot for many endangered and commercially significant highly mobile species. In the last few decades, region has undergone unprecedented physical biological transformations in response to climate variability change. Although it anticipated that species will need adapt shift their distributions, current predictions have relied on short-term data sets or modeled simulations. This left critical gap our understanding of long-term (decadal longer) change species’ responses within NPTZ. Here, we integrate nearly 3 decades satellite tracking from sentinel, juvenile loggerhead sea turtle ( Caretta caretta ), with concurrent observations surface temperature (SST) chlorophyll-a concentrations examine higher trophic level climate-induced changes eastern bounds Between 1997–2024, NPTZ warmed by 1.6°C experienced an approximately 19% decline mean concentration, proxy reduced productivity, resulting 28% (1.65 million km 2 ) increase total oligotrophic habitat Over same period, average latitude foraging shifted northwards 450–600 km. represents distributional rate 116–200km/decade. most years both southern northern range limits northward tandem, indicating rather than expansion. Our findings reveal over quarter century first empirical evidence illustrating substantial spatial megafaunal As continues become more oligotrophic, these insights can provide vital information dynamic conservation management strategies this critically important ecosystem.

Language: Английский

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Marine heatwaves are in the eye of the beholder

Nature Climate Change, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Language: Английский

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Surface and Subsurface Compound Marine Heatwave and Biogeochemical Extremes Under Climate Change

Global Biogeochemical Cycles, Journal Year: 2025, Volume and Issue: 39(5)

Published: April 29, 2025

Abstract Marine species are increasingly threatened by extreme and compound events, as warming, deoxygenation, acidification unfold. Yet, the surface especially subsurface distribution evolution of such events remain poorly understood. We present current projected distributions marine heatwave (MHW), low oxygen (LOX), high acidity (OAX) throughout water column, using observation‐based data from 2004 to 2019 large ensemble Earth system model simulations 1890 2100. Our findings reveal that MHW‐OAX OAX‐LOX prevalent in mid latitudes at ocean surface. At 200 600 m, MHW‐LOX frequent parts tropics, while occur globally. Subsurface often associated with vertical displacements masses, climatological gradients ecosystem stressors typically explaining their occurrence patterns. Projections show a strong rise event frequency over historical period under continued global primarily driven shifts mean oceanic conditions. The portion top 2,000 m affected or rises 20 98 2°C warming emissions scenario preindustrial baseline, 30 shifting‐mean baseline. However, physical biogeochemical changes may also lead regional decreases highlighting complexities how unfold interior. Increasing poses major threat ecosystems, potentially disrupting food webs biodiversity.

Language: Английский

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Basking sharks of the Arctic Circle: year-long, high-resolution tracking data reveal wide thermal range and prey-driven vertical movements across habitats

Animal Biotelemetry, Journal Year: 2025, Volume and Issue: 13(1)

Published: May 9, 2025

Abstract Background Understanding the movement ecology of marine megaplanktivores is essential for conserving these ecologically significant species and managing their responses to environmental change. While telemetry has advanced our knowledge filter-feeding mammal migrations, annual patterns large sharks, such as basking sharks ( Cetorhinus maximus ), remain poorly understood. This particularly case near high latitude range limits where climate impacts are intensifying. In this study, we deployed pop-up satellite archival tags (PSATs) on C. in northern Norway investigate individual possible drivers over an entire cycle. Results Geolocated tracks from two females revealed contrasting migration strategies: one shark performed a return spending boreal winter close Azores, while other resided north Arctic Circle until January before moving North Sea spring. Across diverse habitats, both utilized wide thermal range. included previously unrecorded short-term exposures sub-zero temperatures, extending known tolerance species. High-resolution time series data recovered PSATs enabled use signal processing gradient-based filtering techniques vertical relation physical biological environment. oceanic elevated mesopelagic was observed together with diel migration, whereas shelf areas depth-use were confined by topography more variable, reflective dynamic hydrographic conditions prey distributions. With zooplankton distributions being structured ambient light, density gradients, local topography, alignment frequented depths isolumes, mixed layer depths, bathymetric contours, bioluminescence events suggests actively track layers across habitats. Conclusions Recorded eurythermy behavioural plasticity suggest be well-adapted ocean conditions. These traits may critical responding rapid climate-driven changes abiotic biotic environments high-latitudes, providing insights into how endangered filter-feeders might navigate shifting ecosystems. Graphical

Language: Английский

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Characteristics of animal movement and environmental data for dynamic ocean management: Insights and guidance

Conservation Science and Practice, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 15, 2024

Abstract Dynamic ocean management (DOM) is a critical approach for protecting highly migratory species amid environmental variability and change. We conducted an adapted systematic review to assess how animal movement data are used in DOM applications, identifying key traits, barriers, research priorities. Animal tag inform initial assessments of distributions, development habitat models, near real‐time model inputs, iterative evaluation dynamic management. In documented examples, effective translation scientific insights into products has resulted from early communication between researchers stakeholders, integration fisheries‐dependent advanced modeling approaches, reformatting outputs interdisciplinary needs. However, challenges persist around gaps, science‐policy translation, technical capacity limitations. Our findings highlight the importance intentional, collaborative collection, sharing enable dynamic, climate‐resilient species. demonstrate DOM's adaptability provide guidance practitioners contribute use impactful that informs responsive decision‐making.

Language: Английский

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Observed Impacts of Heatwaves

Springer eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 435 - 489

Published: Jan. 1, 2024

Language: Английский

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Responses of fisheries ecosystems to marine heatwaves and other extreme events

PLoS ONE, Journal Year: 2024, Volume and Issue: 19(12), P. e0315224 - e0315224

Published: Dec. 6, 2024

Marine ecosystems and their living marine resources (LMRs) continue to respond the effects of global change, with environmental factors impacting fisheries biomass, distribution, harvest, associated economic performance. Extreme events such as high-category hurricanes, harmful algal blooms, heatwaves, large-scale hypoxia affect major regions subregions United States waters, frequency expected increase over next decades. The impacts extreme on performance have not been examined closely a system (i.e., cumulatively), or in terms differential particular functional groups given system. Among several U.S. subregions, we responses landings, revenue for perturbations Hurricane Katrina, Deepwater Horizon oil spill). Distinct negative short-term consequences annual were observed all regions, including at system-level scale which higher proportions pelagic species composition variable shellfish-based revenue. In addition, shifts often perturbations. Recovery pre-perturbation levels (both immediate years following event post-event period study) resilience level was cases, although declines biomass landings occurred California ecosystem. Certain are become more common environments, resulting throughout multiple components socioecological systems. recognition understanding is necessary effective, holistic, sustainable management practices.

Language: Английский

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