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2 Documentos relacionados
2 Documentos relacionados
Acceda, Documentación científica de la ULPGC en abierto
oai:accedacris.ulpgc.es:10553/75477
Artículo científico (article). 2013
EFFECTS OF TEMPERATURE ON THE METABOLIC STOICHIOMETRY OF ARCTIC ZOOPLANKTON
Acceda, Documentación científica de la ULPGC en abierto
- Alcaraz, M.
- Almeda García, Rodrigo
- Saiz, E.
- Calbet, A.
- Duarte, C. M.
- Agustí, S.
- Santiago, R.
- Castro Alonso, Ayoze
We assessed the relationship between zooplankton metabolism (respiration and inorganic N and P excretion) and "in situ" temperature through a grid of stations representing a range of natural temperature variation during the ATOS-Arctic cruise (July 2007). The objective was to explore not only the direct effects of temperature on zooplankton carbon respiratory losses (hereafter CR) and NH4-N and PO4-P excretion rates (hereafter NE and PE, respectively), but also to investigate whether these metabolic pathways responded similarly to temperature, and so how temperature could affect the stoichiometry of the metabolic products. Metabolic rates, normalised to per unit of zooplankton carbon biomass, increased with increasing temperature following the Arrhenius equation. However, the activation energy differed for the various metabolic processes considered. Respiration, CR, was the metabolic activity least affected by temperature, followed by NE and PE, and as a consequence the values of the CR : NE, CR : PE and NE : PE atomic quotients were inversely related to temperature. The effects of temperature on the stoichiometry of the excreted N and P products would contribute to modifying the nutrient pool available for phytoplankton and induce qualitative and quantitative shifts in the size, community structure and chemical composition of primary producers that could possibly translate to the whole Arctic marine food web., 697, 689, 9, 2,468, 3,753, Q1, Q1, SCIE
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/75379
Artículo científico (article). 2013
EFFECTS OF TEMPERATURE ON THE METABOLIC STOICHIOMETRY OF ARCTIC ZOOPLANKTON
Digital.CSIC. Repositorio Institucional del CSIC
- Alcaraz, Miquel
- Almeda, Rodrigo
- Saiz, Enric
- Calbet, Albert
- Duarte, Carlos M.
- Agustí, Susana
- Santiago, Reyes de
- Alonso, A.
9 pages, 5 figures, 7 tables, We assessed the relationship between zooplankton metabolism (respiration and inorganic N and P excretion) and "in situ" temperature through a grid of stations representing a range of natural temperature variation during the ATOS-Arctic cruise (July 2007). The objective was to explore not only the direct effects of temperature on zooplankton carbon respiratory losses (hereafter CR) and NH4-N and PO4-P excretion rates (hereafter NE and PE, respectively), but also to investigate whether these metabolic pathways responded similarly to temperature, and so how temperature could affect the stoichiometry of the metabolic products. Metabolic rates, normalised to per unit of zooplankton carbon biomass, increased with increasing temperature following the Arrhenius equation. However, the activation energy differed for the various metabolic processes considered. Respiration, CR, was the metabolic activity least affected by temperature, followed by NE and PE, and as a consequence the values of the CR : NE, CR : PE and NE : PE atomic quotients were inversely related to temperature. The effects of temperature on the stoichiometry of the excreted N and P products would contribute to modifying the nutrient pool available for phytoplankton and induce qualitative and quantitative shifts in the size, community structure and chemical composition of primary producers that could possibly translate to the whole Arctic marine food web, This research was supported by the projects ATOS (POL2006-00550/CTM), for C. Duarte, PERFIL (CTM2006-12344-C01), for M. Alcaraz, TOP COP (CTM2011-23480) for E. Saiz, from the Spanish Ministry of Science and Innovation, and ATP (EU 226248), for P. Wassmann. This is a contribution of the ICM Zooplankton Ecology Group (2009 SGR 1283). The authors wish to express their gratitude to the crew of the R/V Hesp´erides and the UTM for technical support. The authors are also indebted to four unknown referees for their valuable comments and suggestions to clarify and improve the manuscript, Peer reviewed
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Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/264347
Dataset. 2022
EFFECTS OF TEMPERATURE ON THE BIOENERGETICS OF THE MARINE PROTOZOANS GYRODINIUM DOMINANS AND OXYRRHIS MARINA [DATASET]
Digital.CSIC. Repositorio Institucional del CSIC
- Calbet, Albert
- Martínez, Rodrigo Andrés
- Saiz, Enric
- Alcaraz, Miquel
We aimed at studying the mechanisms underneath the ascending and descending sections of the thermal performance curves in marine protozoans. To do so, we exposed Gyrodinium dominans and two strains of Oxyrrhis marina from different origins to three temperatures representative of each section of the thermal response curve (12ºC, ascending section; 18ºC, top; 25ºC, descending section). As variables, we measured growth, ingestion, and respiration rates (this latter with and without food). The growth rates of O. marina strains plotted as a function of temperature showed a triangular response with maximum values at the intermediate temperature. However, G. dominans showed similar growth rates at 12 and 18ºC, and even if showed a marked decrease in growth rates at 25ºC, this was not significant. Ingestion rates were higher at 18ºC for all the strains. The respiration rates of G. dominans were unaffected by temperature, but the respiration rates of both O. marina strains increased with temperature. The specific dynamic action produced by feeding activity ranged from 2 to 20% of the daily carbon ingestion for all organisms investigated. The calculated energetic budget indicated that the responses to temperature were diverse, even within strains of the same species. G. dominans maintained similar growth at all temperatures by balancing anabolism and catabolism functions. In O. marina strains, on the other hand, the decrease in growth rates at the lowest temperature was driven mainly by reduced ingestion rates. However, increased respiration seemed the primary factor affecting the decrease in growth rates at the highest temperature. These results are discussed in the light of previous studies and on its suitability to understand the response of wild organisms to fluctuations in temperature, This research was funded by Grant PID2020-118645RB-I00 by Ministerio de Ciencia e innovación (MCIN)/AEI/ 10.13039/501100011033 and by “ERDF A way of making Europe”. R.A.M. was funded by a PhD fellowship from the National Commission of Science (CONICYT), Ministry of Education, Chile. It is a contribution of the Marine Zooplankton Ecology Group (2017 SGR 87). With the institutional support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S), Para 3 especies de protozoos marino: Tasa de respiración con y sin comida (µmol O2/ind/h), Tasa crecimiento (µ 1/d), Tasa de ingestion (cells/ind/d), Eficiencia bruta de crecimiento (GGE, %), Peer reviewed
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