A new Activity Monitor for Aquatic Zooplankter (AMAZE) allows the recording of swimming activity in wild-caught Antarctic krill (Euphausia superba) DOI Creative Commons
Lukas Hüppe, Dominik Bahlburg,

Michael Busack

et al.

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: July 23, 2024

Abstract Antarctic krill ( Euphausia superba , hereafter krill) is a pelagic living crustacean and key species in the Southern Ocean ecosystem. Krill builds up huge biomass its synchronized behavioral patterns, such as diel vertical migration (DVM), substantially impact ecosystem structure carbon sequestration. However, mechanistic basis of DVM unknown previous studies behavior laboratory were challenged by complex large variability. Using new experimental set-up, we recorded swimming activity individual wild-caught under light–dark cycles. individuals exhibited differential phototactic responses to light regime provided. using metric, showed for first time consistent nocturnal increase controlled environment. set-up was strongly with cycle, similar pattern field when sampled experiment, demonstrated hydroacoustic recordings. The presents promising tool investigating mechanisms underlying which will our understanding ecological interactions, spatial distribution populations, their effects on biogeochemical cycles future.

Language: Английский

Antarctic krill vertical migrations modulate seasonal carbon export DOI
Abigail J. R. Smith, Simon Wotherspoon, Lavenia Ratnarajah

et al.

Science, Journal Year: 2025, Volume and Issue: 387(6732)

Published: Jan. 23, 2025

Vertical migrations by marine organisms contribute to carbon export consumption of surface phytoplankton followed defecation in the deep ocean. However, biogeochemical models lack observational data, leading oversimplified representation cycling migrating organisms, such as Antarctic krill ( Euphausia superba ). Using a numerical model informed 1 year acoustic observations East Antarctic, we estimated total particulate organic (POC) flux from fecal pellets be 9.68 milligrams per square meter day (mg C m −2 −1 A maximum 25% migrated depths >200 with strong seasonality component, transporting <10% POC (1.28 mg ) Accurate estimates are essential inform climate policy and mitigation strategies, that include vertical migration will overestimate if this is not captured.

Language: Английский

Citations

1
Climate change impacts on Antarctic krill behaviour and population dynamics DOI
So Kawaguchi, Angus Atkinson, Dominik Bahlburg

et al.

Nature Reviews Earth & Environment, Journal Year: 2023, Volume and Issue: 5(1), P. 43 - 58

Published: Dec. 19, 2023

Language: Английский

Citations

18
Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels DOI Creative Commons
Dominik Bahlburg, Lukas Hüppe,

Thomas Böhrer

et al.

Royal Society Open Science, Journal Year: 2023, Volume and Issue: 10(9)

Published: Sept. 1, 2023

Understanding the vertical migration behaviour of Antarctic krill is important for understanding spatial distribution, ecophysiology, trophic interactions and carbon fluxes this Southern Ocean key species. In study, we analysed an eight-month continuous dataset recorded with ES80 echosounder on board a commercial fishing vessel in southwest Atlantic sector Ocean. Our analysis supports existing hypothesis that swarms migrate into deeper waters during winter but also reveals high degree variability within seasons, even at small scales. During summer, found associated prolonged surface presence primarily occurred low chlorophyll concentrations whereas multiple ascent-descent cycles per day when were elevated. The plasticity, some behaving differently same location time, suggests not purely environmentally driven process. Differences life stage, physiology type predator are likely other drivers. Finally, our study demonstrates new ways using data from vessels, routine collection additional information potential future projects, they have great to significantly advance ecology.

Language: Английский

Citations

11
Ontogenetic shift in feeding habits of Antarctic deep-sea smelt Bathylagus antarcticus in the Cosmonaut Sea, East Antarctica DOI
Chunlin Liu, Chi Zhang,

Yehui Wang

et al.

Polar Biology, Journal Year: 2025, Volume and Issue: 48(1)

Published: Jan. 12, 2025

Language: Английский

Citations

0
A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing DOI Open Access
Lukas Hüppe, Dominik Bahlburg, Ryan Driscoll

et al.

Published: Jan. 23, 2025

Antarctic krill is a species with fundamental importance for the Southern Ocean ecosystem. Their large biomass and synchronized movements, like diel vertical migration (DVM), significantly impact ecosystem structure biological carbon pump. Despite decades of research, mechanistic basis DVM remains unclear. Circadian clocks help organisms anticipate daily environmental changes, optimizing adaptation. In this study, we used recently developed activity monitor to record swimming individual, wild-caught under various light conditions across different seasons. Our data demonstrate how circadian clock, in combination light, drives distinct bimodal pattern activity, which could facilitate ecologically important behavioral patterns, such as DVM. Rapid damping flexible synchronization indicate that clock adapted life at high latitudes seasonal recordings suggest clock-based mechanism timing processes. findings advance our understanding high-latitude adaptation key species.

Language: Английский

Citations

0
A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing DOI Open Access
Lukas Hüppe, Dominik Bahlburg, Ryan Driscoll

et al.

Published: Jan. 23, 2025

Antarctic krill is a species with fundamental importance for the Southern Ocean ecosystem. Their large biomass and synchronized movements, like diel vertical migration (DVM), significantly impact ecosystem structure biological carbon pump. Despite decades of research, mechanistic basis DVM remains unclear. Circadian clocks help organisms anticipate daily environmental changes, optimizing adaptation. In this study, we used recently developed activity monitor to record swimming individual, wild-caught under various light conditions across different seasons. Our data demonstrate how circadian clock, in combination light, drives distinct bimodal pattern activity, which could facilitate ecologically important behavioral patterns, such as DVM. Rapid damping flexible synchronization indicate that clock adapted life at high latitudes seasonal recordings suggest clock-based mechanism timing processes. findings advance our understanding high-latitude adaptation key species.

Language: Английский

Citations

0
Pygoscelis penguins prefer different oceanographic and terrestrial habitats during the austral summer DOI Creative Commons
Katherine L. Gallagher, Rachael Herman,

K. Walton

et al.

Ecosphere, Journal Year: 2025, Volume and Issue: 16(2)

Published: Feb. 1, 2025

Abstract Pygoscelis penguins interact with both terrestrial and marine environments, especially during the austral summer when they raise their chicks. Accessible ice‐free ground spaces serve as locations for to build colonies successfully chicks while surrounding environment serves foraging grounds adult birds. Penguins must be able navigate through waters around forage Antarctic krill ( Euphausia superba ), primary prey summer. Krill, whose distributions are driven partially by physics behaviors, also plentiful in near support penguins. Here, we test hypothesis that oceanographic variables can describe habitat suitability along West Peninsula (WAP) hypothesize covariates contribute differently each species based on life‐histories. We built models using logistic regressions a variety of datasets determined important jackknife analysis. developed novel method estimate contribution model terms. Models performed well across all (area under curve [AUC] >0.85) predicted existing habitats highly suitable species. The new species, including potential gentoo Marguerite Bay. While analysis suggests elevation is single most variable some such spring sea ice extent, persistence, near‐shore current velocities were major contributors Peninsula. Oceanographic contributed (~65%) chinstrap penguin suitability, least (20%–40%) Adélie suitability. Different made up this term different suggesting select breeding colonies. Understanding drivers today will help us understand how change future climate conditions.

Language: Английский

Citations

0
Ecological niche and habitat use of Antarctic krill (Euphausia superba) and the pelagic tunicate (Salpa thompsoni) under future climate change: further overlap or separation? DOI

Zhuang Chen,

X.-Y. Chen,

Guoping Zhu

et al.

Biodiversity and Conservation, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 27, 2025

Language: Английский

Citations

0
The Unsung Heroes of Aquatic Ecosystems: The Vital Roles of Plankton DOI Creative Commons
Leonel Pereira

IntechOpen eBooks, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Plankton, a diverse group of organisms suspended in freshwater and marine ecosystems, plays crucial role aquatic environments. They are categorized into phytoplankton, zooplankton, bacterioplankton, each contributing uniquely to ecological processes. Phytoplankton, as primary producers, drives photosynthesis oxygen production, forming the base food webs. Zooplankton, consumers, link producers higher trophic levels aid nutrient recycling. Bacterioplankton is essential for decomposing organic material mediating biogeochemical cycles. Plankton distribution influenced by environmental factors such light, nutrients, temperature, salinity, with distinct communities habitats. Understanding plankton dynamics vital appreciating their global cycles ecosystem health.

Language: Английский

Citations

0
“A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing” DOI Open Access
Lukas Hüppe, Dominik Bahlburg, Ryan Driscoll

et al.

Published: April 3, 2025

Antarctic krill is a species with fundamental importance for the Southern Ocean ecosystem. Their large biomass and synchronized movements, like diel vertical migration (DVM), significantly impact ecosystem structure biological carbon pump. Despite decades of research, mechanistic basis DVM remains unclear. Circadian clocks help organisms anticipate daily environmental changes, optimizing adaptation. In this study, we used recently developed activity monitor to record swimming individual, wild-caught under various light conditions across different seasons. Our data demonstrate how circadian clock, in combination light, drives distinct bimodal pattern activity, which could facilitate ecologically important behavioral patterns, such as DVM. Rapid damping flexible synchronization indicate that clock adapted life at high latitudes seasonal recordings suggest clock-based mechanism timing processes. findings advance our understanding high-latitude adaptation key species.

Language: Английский

Citations

0