Beatriz Baliño - Academia.edu (original) (raw)

Papers by Beatriz Baliño

SciELO (SciELO Preprints), Dec 10, 2023

Fisheries Research, Aug 1, 1998

Two modeling approaches were used to evaluate the combined responses in a ®sh population to envir... more Two modeling approaches were used to evaluate the combined responses in a ®sh population to environmental¯uctuations and exploitation. Short-term effects of growth and survival of year classes of cod and the effects of ®shing were evaluated by using a modi®ed version of a dynamic ecosystem model (DYNECOMAS II), originally developed for extensive mariculture purposes in Masfjorden, western Norway. Simulations indicated that the availability of zooplankton and density-dependent predation and cannibalism were key factors for the carrying capacity for cod in the fjord. On a short-term scale, there was a strong-density-dependent regulation of cod productivity, individual growth and survival, while ®sheries had little impact. Long-term effects on the ®tness of cod in relation to ®shery and environmental variability were evaluated by means of a life history model. The intrinsic rate of increase r was chosen as a measure of ®tness. The impact on cod ®tness of maturation age, variable survival at egg, larval and 0-group stage (re¯ecting variable recruitment to age 1) and the degree of density-dependent growth were studied for different entry ages to the ®shery for both moderate and high ®shing intensities. A modi®ed Euler± Lotka equation was parameterized using available empirical data on growth, age-dependent ®shing mortality and fecundity for cod from Masfjorden and DYNECOMAS II model-predicted natural mortality for juveniles (predation mortality). The solution (r) was found by iteration for combinations of maturing age, ®shing mortality and survival probability until 1 year of age. The predictions obtained were that (a) the lower the survival probability until 1 year of age, the lower the ®tness; (b) the higher the maturing age the lower the ®tness; (c) an early entry to even a moderate ®shery resulted in r<0 for low survival probability to age 1; (d) if a high degree of density-dependent growth was associated with an early entry to an intensive ®shery (F1) from age 1 year and onwards, the surviving individuals from an average year class may not produce enough replace spawners regardless of maturing age, since r<0.

Ophelia, Feb 1, 1995

Abstract A simple, but general, simulation model is specified according to the state-of-the-art w... more Abstract A simple, but general, simulation model is specified according to the state-of-the-art within phytoplankton modelling: Process representations are based upon prevailing theoretical and empirical representations given in the literature, and a set of earlier published values of model coefficients that have demonstrated good fit to reliable observations was selected. The emerging phytoplankton model was then validated against data obtained from enclosure experiments with light-, N-, P- and Si-limitations. We applied no tuning of the coefficients as the purpose of this test was to estimate the predictive power of the proposed model. The general standard deviations between model predictions and observations were on the range 0.04–0.36 and 0.13–0.42 for the nutrient and phytoplankton state variables respectively. Not surprisingly, these values are higher than those obtained in tuned simulations. Nevertheless, several characteristics, such as the balance between diatoms and flagellates, were predicted b...

Zenodo (CERN European Organization for Nuclear Research), Feb 1, 2021

Zenodo (CERN European Organization for Nuclear Research), Dec 1, 2021

The WDC-MARE Reports aim is to publish scientific results as provided through the data management... more The WDC-MARE Reports aim is to publish scientific results as provided through the data management units of research institutes and national and international projects. These scientific results comprise collections and compilations of data accompanied by their describing meta-information as well as technical notes. Usually the reports are accompanied by a CD-ROM/DVD that contains the project related data sets in a consistent technical ASCII-format. The content of the medium represents the information as stored in the information system PANGAEA at the time of publication. WDC-MARE Reports appear in irregular intervals. Access information The WDC-MARE Reports are published according to the "Budapest Open Access Initiative" and are freely available on the Internet. The content of a WDC-MARE Report (text, figures, photos, data etc.) is-unless marked otherwise-property of the principle investigator (PI). Use, reproduction and distribution of information and data in part or in total is restricted to non-commercial education and research purpose and must respect intellectual property rights. Any user of this data is required to quote the original citation and acknowledge the respective PI, project or institute.

Cover Photos: "The wave"-Rough seas in the Southern Ocean. Photo courtesy of M.C. Bowles, WHOI. S... more Cover Photos: "The wave"-Rough seas in the Southern Ocean. Photo courtesy of M.C. Bowles, WHOI. Ship: The research vessel, Polarstern, has participated in numerous JGOFS cruises in the Atlantic and Southern Oceans. Photo courtesy of M. Klages, Alfred Wegener Institute for Polar and Marine Research. Scientist with children: A JGOFS scientist recruiting future researchers. Photo courtesy of D. Karl, University of Hawaii.

Zenodo (CERN European Organization for Nuclear Research), Feb 1, 2022

Who we are… The Climate and Cryosphere (CliC) is a global community of dedicated and enthusiastic... more Who we are… The Climate and Cryosphere (CliC) is a global community of dedicated and enthusiastic researchers with expertise and knowledge of the cryosphere and its interactions with the climate system. CliC expertise spans simulation modelling, field observations, process studies and crosscutting workers who engage with other disciplines and stakeholders. CliC is one of the Core Projects of the World Climate Research Program (WCRP, https://www.wcrp-climate.org) What we do… CliC identifies key research questions, priorities, gaps and challenges pertaining to the cryosphere and its interaction with the global climate system, and coordinates international activities to promote activities that address these matters. CliC highlights emerging issues, facilitates exchanges amongst scientists, and with relevant external stakeholders, promotes international cooperation. The project also communicates cryosphere related science to policymakers, funding agencies, and the general public. To ensure that we are preparing for the future, CliC takes a leading role in promoting early career researcher development, including through fellowships How we work… CliC achieves its mission by bringing together scientists and stakeholders from all over the world to plan and take part in activities targeting the scientific priorities in cryosphere science. CliC activities are overseen by the CliC Scientific Steering Group (SSG) which has the overall responsibility for planning and guiding the work of the Core Project. The CliC International Project Office supports the SSG and the wider CliC community in their work and is the main point of contact for CliC (www.climate-cryosphere.org).

Sarsia, 1990

The distribution. biomass. and predator-prey relationships of the pelagic asst'mhlage in Masfjord... more The distribution. biomass. and predator-prey relationships of the pelagic asst'mhlage in Masfjorden. western Norway. was st udied in January I'.IX9. The pelugic hiomns.~ wns uomi• nated by particulate organic matter. Biomasses of copepods. macroplnnkton. IInd mesnpelugic fishes were of the same orde r of magnitude. while the: biomass of larger pelugi(' fishe:s were one o rder less. Predator-prey relationships seemed most important lit intermedinte: and higher trophic levels. Two sound-scattering layers, consisting of adult Mal/rolicl/s rnuelleri (lower laye r) and juvenile M. rnuellt'ri (upper IlI yer) performed inslUntaneous li ghtdependent verticIII migration. Vertical distributions arc explained in te rms of balancing food demands agai nst predation risk.

Marine Ecology Progress Series, 1993

Sound scattering layers (SSLs) and vertical distribution of zooplankton and micronekton in Masfjo... more Sound scattering layers (SSLs) and vertical distribution of zooplankton and micronekton in Masfjorden, western Norway, were studied in January 1988. Two characteristic SSLs were found in the deepest fjord basin (bottom depth 490 m) while single scattering layers were observed in shallower baslns (depths <300 m). The SSLs performed diurnal vertical displacements, exhibiting migrational speeds of up to 90 m h-' The adjustment of the SSLs' day depth was directly proportional to the rate of change in the logarithm of surface light and inversely proportional to the extinction coefficient of the water. Large horizontal differences in biomass in the fjord are related to a combination of advection and changes in migrational behaviour. Feeding activity of the micronekton was higher during light hours. Euphausiids of the deepest basin were mainly feeding on detritus while those in the innermost part of the fjord seemed to be preying upon copepods. The observed vertical distribution of the zooplankton and micronekton were examined in relation to mode of feeding (visual vs tactile), trophic level (omnivory vs carnivory), size (small vs large), and food type and availabihty. KEY WORDS: Fjord. Light. Micronekton. Migration. Sound scattering layers (SSLs). Zooplankton

Fisheries Research, 1998

Ophelia, 1995

3 4 • Foreword 5 • Science Highlights 7 • Why Study the Oceans? IN THIS ISSUE OF the IGBP Science... more 3 4 • Foreword 5 • Science Highlights 7 • Why Study the Oceans? IN THIS ISSUE OF the IGBP Science Series, we report the achievements and scientifi c highlights of The Joint Global Ocean Flux Study (JGOFS). JGOFS began its active research phase in 1988 and has grown to include the work of many 100's of scientists and students in over 20 seagoing nations on the seven continents and all the principal oceans of our planet.