Abstract. The daily vertical migrations of fish and other metazoans actively transport organic carbon from the ocean surface to depth, contributing biological pump. We use an oxygen-constrained, game-theoretic food-web model simulate diel estimate near-global (global minus coastal areas high latitudes) fluxes sequestration by zooplankton due respiration, fecal pellets, deadfalls. Our provides estimates export potential for a range pelagic functional groups, despite uncertain biomass some...

Abstract The magnitude and efficiency of particulate carbon export from the ocean surface depends not only on net primary production (NPP) but also how is consumed, respired, repackaged by organisms. We contend that several these processes can be captured size spectrum plankton community. However, most global models have relatively simple food‐web structures are unable to generate spectra. Moreover, life‐cycles multicellular zooplankton typically resolved, restricting ability represent...

Ocean warming is projected to threaten fisheries, but the extent varies greatly between models due a poor understanding of how complex food webs respond change. Likewise, inequalities in socioeconomic dependence on fisheries and uneven distributions global fishing effort make it unclear distribution declines could translate into impacts. Here we developed quantitative IPCC tripartite risk mapping approach, combining hazard (projected pelagic fish decline), exposure (present day intensity),...

Abstract A warmer ocean will change plankton physiological rates, alter community composition, and in turn affect ecosystem functions, such as primary production, recycling, carbon export. To predict how temperature changes dynamics function, we developed a mechanistic trait‐based model of unicellular (auto‐hetero‐mixotrophic protists bacteria). Temperature dependencies are specifically implemented on cellular process rather than at the species level. As uptake resources metabolic processes...

Abstract The biological carbon pump transports photosynthetically fixed from surface waters to depths. It removes the atmosphere and sequesters it in deep ocean, playing an important role global climate regulation. As is directly related processes, heavily influenced by biomass trophic interactions between populations ecosystem. However, behavioral responses adaptations predation risk change interactions, potentially having larger impacts than direct effects on population abundances. Thus,...

Abstract Despite phytoplankton contributing roughly half of the photosynthesis on earth and fueling marine food‐webs, field measurements biomass remain scarce. The particulate backscattering coefficient ( b bp ) has often been used as an optical proxy to estimate carbon C phyto ). However, total observed is impacted by size, cell composition, non‐algal particles. lack data prevented quantification uncertainties driven these factors. Here, we first review discuss existing algorithms applying...

Abstract Phytoplankton primary production is a crucial component of Arctic Ocean (AO) biogeochemistry, playing pivotal role in carbon cycling by supporting higher trophic levels and removing atmospheric dioxide. The advent satellite observations measuring chlorophyll concentration (Chl_a) has provided unprecedented insights into the distribution AO phytoplankton, enhancing our ability to assess oceanic net (NPP). However, optical properties waters differ significantly from those...

Abstract We analyzed the temporal trends (1998–2022) of surface phytoplankton Chlorophyll (Chl) concentration in Arctic at local, regional, and pan‐Arctic scales. used four empirically derived Chl satellite ocean color products: two global merged products MODIS products, one calibrated to Arctic. At local level, between 10% 40% area with valid pixels showed statistically significant trends, those showing increases, other third indicating a decrease. regional only Barents Chukchi Seas had...

Traditional communities situated in mangrove forests near the coast have developed a way of life based on ecosystem services associated with various uses and activities (firewood extraction, artisanal fishing, crab clam harvesting, etc.). The importance food security sovereignty is frequently mentioned context small-scale fishing but has seldom been articulated as an explicit objective. present work identifies knowledge gap concerning profits generated by exploitation, which are not recorded...

Abstract The daily vertical migrations of fish and other metazoans actively transport organic carbon from the ocean surface to depth, contributing biological pump. We use an oxygen-constrained, game-theoretic food-web model simulate diel estimate global fluxes sequestration by zooplankton due respiration, fecal pellets, deadfalls. Our provides estimates export potential for a range pelagic functional groups, despite uncertain biomass some groups. While production is modest (~20% total), we...

Phytoplankton primary production is a crucial component of Arctic Ocean (AO) biogeochemistry, playing pivotal role in the carbon cycling by supporting higher trophic levels and removing atmospheric dioxide. The advent satellite observations measuring chlorophyll concentration (Chl_ a) has yielded unprecedented insights into distribution AO phytoplankton, enhancing our ability to assess oceanic productivity. However, optical properties waters differ significantly from those lower‐latitude...

Abstract Marine heatwaves, increasingly frequent, impact marine ecosystems and services. Still, understanding how temperature affects observed responses remains limited due to complex interactions among temperature, abiotic biotic factors, community dynamics. Here we try fill this gap by exposing simulated plankton communities seasonal heatwaves of 4°C with a trait- size-structured model that accounts for protists the life cycle copepods. Despite short lifespans fast growth rates plankton,...

Marine heatwaves, increasingly frequent, impact marine ecosystems and services. Still, understanding how temperature affects observed responses remains limited due to complex interactions among temperature, abiotic biotic factors, community dynamics. Here we try fill this gap by exposing simulated plankton communities seasonal heatwaves of 4°C with a trait- size-structured model that accounts for protists the life cycle copepods. Despite short lifespans fast growth rates plankton, results...

Abstract. The daily vertical migrations of fish and other metazoans actively transport organic carbon from the ocean surface to depth, contributing biological pump. We use an oxygen-constrained, game-theoretic food-web model simulate diel estimate global fluxes sequestration by zooplankton due respiration, fecal pellets, deadfalls. Our provides estimates export potential for a range pelagic functional groups, despite uncertain biomass some groups. While production is modest (∼20 % total), we...

Abstract The magnitude and efficiency of particulate carbon export from the ocean surface depends not only on net primary production (NPP) but also how is consumed, respired, repackaged by organisms. We contend that several these processes can be captured size spectrum plankton community. However, most global models have relatively simple food-web structures are unable to generate sizespectra. Moreover, life-cycles multicellular zooplankton typically resolved, restricting ability represent...

Abstract Despite phytoplankton contributing roughly half of the photosynthesis on earth and fueling marine food-webs, field measurements biomass remain scarce. The particulate backscattering coefficient ( b bp ) has often been used as an optical proxy to estimate carbon C phyto ). However, total observed is impacted by size, cell composition, non-algal particles. lack data prevented quantification uncertainties driven these factors. Here, we first review discuss existing algorithms applying...

<p>Diel Vertical Migration (DVM) is a key feature of pelagic and mesopelagic ecosystems, mainly driven by predator-prey interactions along time-varying vertical gradient light. Marine organisms including meso-zooplankton fish typically hide from visual predators at depth during daytime migrate up dusk to feed in productive near-surface waters nighttime. Specific migration patterns, however, vary tremendously, for instance terms residency day night. In addition environmental...