“A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing”

Опубликована: Апрель 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.

Язык: Английский

A circadian clock drives behavioral activity in Antarctic krill (Euphausia superba) and provides a potential mechanism for seasonal timing

eLife, Год журнала: 2025, Номер 14

Опубликована: Апрель 29, 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.

Язык: Английский

Monitoring Antarctic krill (Euphausia superba) distribution in the Southern Ocean: environmental DNA (eDNA) adds to the toolbox

Frontiers in Marine Science, Год журнала: 2025, Номер 12

Опубликована: Май 19, 2025

Antarctic krill ( Euphausia superba Dana) is a key species of the Southern Ocean ecosystem, immensely abundant and targeted by fishery. For their sustainable management, distribution biomass estimates are required, typically achieved through acoustic-trawl surveys. We explore how environmental DNA (eDNA) can contribute to our understanding or habitat distribution. collected eDNA samples filtering five liters seawater per sample in East from surface (5 m depth) seafloor (381–4422 depth, total n = 110). used quantitative PCR measure abundance age, metabarcoding detect any species. This data was compared acoustic, visual trawl detections krill. common largely overlapped with detections. Highest concentrations were detected above swarms, declining increasing distance swarms. Near recent sampling locations, swarms more likely acoustically than near old locations. less concentrated continental slope area south survey area, both for Both methods at great depths (recent eDNA: 4300 m; visual: 3080 m). In data, dominant species, followed Thysanoessa macrura G.O. Sars, which particularly larval stages throughout including swarm recommend inclusion use, difficult-to-access areas, such as under ice benthic habitats.

Язык: Английский