As aquaculture becomes more important for feeding the growing world population, so too do required natural resources needed to produce feed. While there is potential replace fish meal and oil with terrestrial feed ingredients, it understand both positive negative implications of such a development. The use large proportion may reduce pressure on fisheries provide fish, but at same time significantly increase freshwater resources, due water consumption pollution in crop production aquafeed....

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 384:1-12 (2009) - DOI: https://doi.org/10.3354/meps08022 FEATURE ARTICLE Optimal uptake kinetics: physiological acclimation explains pattern of nitrate by phytoplankton in ocean S. Lan Smith1,*, Yasuhiro Yamanaka1,2,3, Markus Pahlow4, Andreas Oschlies4 1Ecosystem Change Research Program, Frontier Center for...

This paper assesses the sustainability, efficiency and equity of water use in Latin America Caribbean (LAC) by means a geographic Water Footprint Assessment (WFA). It aims to provide understanding from both production consumption point view. The study identifies priority basins areas perspectives blue scarcity, pollution deforestation. Wheat, fodder crops sugarcane are identified as products related scarcity. domestic sector is regarding nitrogen. Soybean pasture We estimate that consumptive...

Diatoms have evolved a multitude of morphologies, including highly elongated cells and cell chains. Elongation chain formation many possible functions, such as grazing protection or effects on sinking. Here, model diffusive advective nutrient transport is used to predict impacts shape length potential supply uptake in turbulent environment. Rigid, contiguous, prolate spheroids thereby represent the shapes simple chains solitary cells. At scales larger than few centimeters, water motions...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 287:33-43 (2005) - doi:10.3354/meps287033 Linking chlorophyll-nutrient dynamics Redfield N:C ratio with a model of optimal phytoplankton growth Markus Pahlow* Dalhousie University, 1355 Oxford Street, Halifax, B3H 4J1 Nova Scotia, CanadaBedford Institute Oceanography, PO Box, 1006 Dartmouth, B2Y 4A2 Canada...

Recent suggestions to reduce the accumulation of anthropogenic carbon dioxide in atmosphere have included ocean fertilization by artificial upwelling. Our coupled carbon‐climate model simulations suggest that upwelling may, under most optimistic assumptions, be able sequester atmospheric CO 2 at a rate about 0.9 PgC/yr. However, predicts 80% sequestered is stored on land, as result reduced respiration lower air temperatures brought cold waters. This remote and distributed sequestration would...

The natural variability of floods cannot be represented appropriately by single design floods. Different hydrological scenarios are needed for sustainable flood protection structures such as control reservoirs and polders. In this paper a method to estimate the probability generated risk analysis system is presented. Bivariate analyses different variables using copulas applied overcome problem that univariate may lead an over- or underestimation risk. mesoscale Unstrut river basin in...

A stochastic model for the generation of daily time series rainfall at multiple locations in which amount is modeled by a mixture two different probability distribution functions presented. implemented with specific objective characterizing extremes precipitation. The approach based on assumption that within have behavior compared to normal regime multivariate autoregressive used local occurrence and while keeping intersite covariance structure using truncated distribution. simulated further...

On the basis of assumption that natural selection should tend to produce organisms optimally adapted their environments, we consider optimality as a guiding concept for abstracting behavior aquatic micro‐organisms (plankton) develop models study and predict planktonic communities. This is closely related trait‐based ecology, which considers traits functionality can be understood result optimization inherent in selection, subject constraints imposed by fundamental processes necessary life....

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 489:1-16 (2013) - DOI: https://doi.org/10.3354/meps10449 FEATURE ARTICLE Optimality-based model of phytoplankton growth and diazotrophy Markus Pahlow*, Heiner Dietze, Andreas Oschlies GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Germany *Email: mpahlow@geomar.de ABSTRACT: The...

Abstract Gelatinous zooplankton (Cnidaria, Ctenophora, and Urochordata, namely, Thaliacea) are ubiquitous members of plankton communities linking primary production to higher trophic levels the deep ocean by serving as food transferring “jelly‐carbon” (jelly‐C) upon bloom collapse. Global biomass within upper 200 m reaches 0.038 Pg C, which, with a 2–12 months life span, serves lower limit for annual jelly‐C production. Using over 90,000 data points from 1934 2011 Jellyfish Database...

We use observations from novel biogeochemical profiling floats deployed by the Southern Ocean Carbon and Climate Observations Modeling program to estimate annual net community production (ANCP; associated with carbon export) seasonal drawdown of mesopelagic oxygen surface nitrate in Ocean. Our estimates agree previous showing an increase ANCP vicinity polar front (∼3 mol C m −2 y −1 ), compared lower rates subtropical zone (≤ 1 ) ice (<2 ). Paradoxically, south is elevated silicate...

The Redfield ratio [carbon:nitrogen:phosphorus (C:N:P)] of particle flux to the deep ocean is a key factor in marine biogeochemical cycling. Changes oceanic carbon sequestration have been linked variations on geological time scales, but this generally assumed be constant with modern ocean. However, deep-water ratios northern hemisphere show evidence for temporal trends over past five decades. North Atlantic Ocean exhibits rising N:P ratio, which may related increased deposition atmospheric...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 376:69-83 (2009) - DOI: https://doi.org/10.3354/meps07748 Chain model of phytoplankton P, N and light colimitation Markus Pahlow*, Andreas Oschlies IFM-GEOMAR, Düsternbrooker Weg 20, 24105 Kiel, Germany *Email: mpahlow@ifm-geomar.de ABSTRACT: Models multiple potentially limiting nutrients currently employ...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 473:1-5 (2013) - DOI: https://doi.org/10.3354/meps10181 FEATURE ARTICLE: NOTEOptimal allocation backs Droop's cell-quota model Markus Pahlow*, Andreas Oschlies GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Germany *Email: mpahlow@geomar.de ABSTRACT: is most successful...

Abstract Chlorophyll (Chl) is a distinctive component of autotrophic organisms, often used as an indicator phytoplankton biomass in the ocean. However, assessment from Chl relies on accurate estimation Chl:carbon(C) ratio. Here we present global patterns Chl:C ratios surface ocean obtained growth model that accounts for optimal acclimation to ambient nutrient, light, and temperature conditions. The agrees largely with observed/expected Chl:C. Combining our estimates satellite particulate...

One method to inform decisions with respect sustainable, efficient and equitable water allocation use is footprint assessment (WFA). This paper presents a preliminary WFA of South Africa (SA) based on data for the period 1996–2005. Crop production was found contribute about 75% total national production. The crop mainly composed five crops: maize, fodder crops, sugarcane, wheat sunflower seed, which account 83% footprint. average African consumer 1 255 m3/yr, below world 385 dominated by...

Recent studies have analysed valuable compilations of data for the size-scaling phytoplankton traits, but these cannot be employed directly in most large-scale modelling studies, which typically do not explicitly resolve relevant trait values. Although some recent species composition and sorting within communities, account observed flexible response such as dynamic acclimation often laboratory experiments. In order to derive a simple yet model growth that can useful wide variety ocean...

Abstract. Uncertainties in projections of marine biogeochemistry from Earth system models (ESMs) are associated to a large degree with the imperfect representation plankton ecosystem, particular physiology primary and secondary producers. Here, we describe implementation an optimality-based plankton–ecosystem model (OPEM) version 1.1 variable carbon : nitrogen phosphorus (C:N:P) stoichiometry University Victoria ESM (UVic; Eby et al., 2009; Weaver 2001) behaviour two calibrated reference...

The first large-sample catchment hydrology dataset for Aotearoa New Zealand, the Catchment Attributes and Meteorology Large-Sample Studies—New Zealand (CAMELS-NZ), provides hourly hydrometeorological time series detailed landscape attributes 373 catchments across Zealand. Spanning over years 1972 to 2024, this includes records of streamflow, precipitation, temperature, potential evapotranspiration. CAMELS-NZ offers a set that quantify physical characteristics such as land cover,...