Consulta: subjectFacets:"Secondary production"
Registros recuperados: 10
Data/hora: 09/06/2024 05:45:51

Spatio-temporal trends in zooplankton biomass in the northern Humboldt current system off Peru from 1961-2012
Provedor de dados: 5
Autores: Aronés, Katia; Grados, Daniel; Ayón, Patricia; Bertrand, Arnaud.
Anchovy (Engraulis ringens) is the most important exploited fish species in the Northern Humboldt Current System (NHCS) off Peru. This species, as well as most other pelagic resources, mainly forage on zooplankton. The NHCS is bottom-up controlled at a variety of scales. Therefore, fish biomass is driven by the abundance of their prey. In this context, we studied the spatiotemporal patterns of zooplankton biomass in the NHCS from 1961-2012. Data were collected with Hensen net all along the Peruvian coast. To transform zooplankton biovolume into biomass we used a regression that was calibrated from 145 zooplankton samples collected during four surveys and, for which, precise information was available on both biovolume and wet weight. The regression model...
Tipo: Text
Palavras-chave: Secondary production; Mesozooplankton; Macrozooplankton; Regime-shift; Spatiotemporal distribution; Decadal trends.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00588/70042/67972.pdf

Zooplankton production in the Mediterranean Sea
Provedor de dados: 5
Autores: Greze, V.
An attempt is made to calculate the specific production of major zooplankton groups using a physiological method proposed by Winberg. The present report is based on material obtained from 50 stations in the Aegean and Adriatic Seas; Tunisian Strait and Algerian-Provencal basin. The algorithm of Zharov, used by the author, includes the data biomass, abundance, relation between metabolism at given temperature and organism, dependence of production upon metabolism, and the food utilization coefficient for growth.
Tipo: Text
Palavras-chave: MED; Body weight; Biomass; Growth; Food conversion; Temperature effects; Animal metabolism; Secondary production; Zooplankton.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1513.pdf

Comparaison de méthodes d'évaluation de la production secondaire d'une population de l'annélide polychète Ditrupa arietina (O.F. Muller)
Provedor de dados: 5
Autores: Medernach, L; Gremare, A.
We compared the ability of three direct methods (increment summation, loss summation and instantaneous growth rate coefficient), the size-frequency method, and eight indirect methods (Banse and Mosher, Benke, Brey, Edgar, Morin and Bourassa, Plante and Downing, Robertson and Schwinghamer et al.) to measure or to predict the secondary production of a Mediterranean population of the polychaete Ditrupa arietina. This comparison was carried out both on the 1994 cohort during its two-year lifespan and on the entire population during the two years of the study (1994-1996). Our results showed that all three direct methods are more or less equivalent. Results referring to the year 1994-1995 showed a strong overestimation of the actual production by the size...
Tipo: Text
Palavras-chave: Production secondaire; Méthodes; Polychètes; Méditerranée; Secondary production; Methods; Polychaetes; Mediterranean Sea.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43614/43916.pdf

Available Benthic Energy Coefficient (ABEC): a generic tool to estimate the food profitability in coastal fish nurseries
Provedor de dados: 5
Autores: Tableau, Adrien; Le Bris, H.; Brind'Amour, Anik.
The benthic production of prey seems to be one of the main drivers among many environmental factors that influence the quality of fish nurseries and potentially limit their carrying capacity. However, the contribution of food availability in the growth and survival of juveniles is still controversial. The Available Benthic Energy Coefficient (ABEC) aims to assess the trophic profitability of benthic invertebrate prey; this concept reflects the combination of energy richness and availability of prey. A value of the coefficient was associated with each prey species. This value was calculated from the product of 4 components: (1) mass energy, (2) productivity, (3) regeneration, and (4) accessibility. Thus, this coefficient is expressed as a quantity of energy...
Tipo: Text
Palavras-chave: Predator-prey relationship; Secondary production; Prey availability; Demersal fish; Nursery habitat; Carrying capacity; Bioenergetics.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00260/37079/35588.pdf

Novel approach for testing the food limitation hypothesis in estuarine and coastal fish nurseries
Provedor de dados: 5
Autores: Tableau, Adrien; Le Bris, H; Saulnier, E; Le Pape, Olivier; Brind'Amour, Anik.
Survival success of early life stages of fish is regulated by density-dependent effects, but the limiting factors explaining these effects have not been well identified. In coastal habitats, juveniles of many fish species occur in high concentrations and possibly compete for food resources. This study compared the ratio of food consumption to benthic prey production to test whether food availability is a major factor defining the carrying capacity of fish nurseries. We developed a method to quantify the exploitation efficiency (also called ecotrophic efficiency) of the juvenile fish feeding on benthic prey, expressed as a ratio of food consumption to food production. This method includes many sources of uncertainty and a key parameter of prey...
Tipo: Text
Palavras-chave: Exploitation efficiency; Predator-prey relationship; Food consumption; Fish juvenile; Nursery habitat; Bioenergetics; Density dependence; Carrying capacity; Secondary production.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00588/70009/67925.pdf

Estudios de Caracterización del Mar Territorial Continental del Ecuador, Bases para lograr la zonificacion marina. Estudio 4: Distribución y Variación de los valores de productividad primaria (fitoplacton) y secundaria (zooplacton), a dos profundidades, en el mar territorial y aguas interiores de la Plataforma Continental del Ecuador
Provedor de dados: 20
Autores: Valle, M.; Fuentes, M.
Del 28 de agosto al 11 de septiembre de 2013 y del 7 al 21 de enero de 2014 se realizaron dos campañas de investigación a bordo del B/I Octopussy con el objetivo de establecer la distribución y variación de los valores de productividad primaria (fitoplancton) y secundaria (zooplancton), a dos profundidades, obteniéndose muestras planctónicas en 61 estaciones planctónicas distribuidas en cinco macrozonas que abarcan el Mar Territorial y Aguas Interiores de la Plataforma Continental del Ecuador. Se obtuvieron muestras para la determinación cualitativa y cuantitativa del fitoplancton y zooplancton mediante botellas Van Dorn (0 y 15 m) y mediante arrastres superficiales y verticales con redes de 60 y 200 μm de luz de malla según el caso. También se obtuvieron...
Tipo: Report
Palavras-chave: Primary production; Secondary production; Zoopláncton; Fitopláncton.
Ano: 2014
URL: http://hdl.handle.net/1834/5462

Producción estacional de Oithona nana (Copepoda: Cyclopoida) en aguas costeras de Argentina
Provedor de dados: 20
Autores: Temperoni, B.
Oithona nana (Copepoda: Cyclopoida)is a widely-distributed neritic species, which often comprises up to 90 percentage of the zooplankton in many coastal areas. This small copepod plays an important role as a dominant prey in the diet of Engraulis anchoita larvae, which is a main component of major ecological relevance in the pelagic food webs of the Argentine Sea (SW Atlantic Ocean). The objective of this study was to estimate, for the first time, the seasonal variation of O. nana secondary production in a temperate region: coastal waters off Buenos Aires province, Argentina, at the EPEA Station (Estación Permanente de Estudios Ambientales, (38°28' S-57°41' W). Zooplankton samples (N=14)were taken by oblique tows of a Minibongo net (mouth diameter: 0.18 m;...
Tipo: Theses and Dissertations
Palavras-chave: Secondary production; Coastal waters; Zooplankton; Seasonal variations; Abundance; Environmental conditions; Zooplankton; Coastal waters; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_25205; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 2008
URL: http://hdl.handle.net/1834/3131

Estimación de producción secundaria y productividad para una población intermareal de Trophon Geversianus, (Bahía Laredo, Estrecho de Magallanes)
Provedor de dados: 20
Autores: Montiel, Américo; Andrade, Claudia; Quiroga, Eduardo.
El gastrópodo carnívoro Trophon geversianus (Pallas, 1774) es una de las especies bentónicas explotadas comercialmente en la región de Magallanes, de la cual no existe información relacionada a su productividad biológica. En este trabajo, se estimó la producción secundaria y productividad de una población intermareal de T. geversianus a través del modelo de redes neurales. Los muestreos se realizaron estacionalmente en Bahía Laredo, estrecho de Magallanes entre los meses de agosto 2007 y abril 2008. La longitud de los ejemplares de T. geversianus fluctuó de 12,4 a 55,4 mm (28,4 ± 7,4). La población presentó una distribución unimodal. Las densidades medias estacionales oscilaron entre 0,23 ind m-2 y 0,97 ind m-2, mientras que la biomasa media varió entre...
Tipo: Journal Contribution
Palavras-chave: Marine molluscs; Secondary production; Biological production; Gasterosteidae; Muricidae; Http://aims.fao.org/aos/agrovoc/c_41671; Http://aims.fao.org/aos/agrovoc/c_47299.
Ano: 2009
URL: http://hdl.handle.net/1834/4169

Distribución batimétrica, espacial y temporal del macrozoobentos en el Canal Beagle, Tierra del Fuego, Argentina
Provedor de dados: 20
Autores: Diez, M.
El Canal Beagle (Tierra del Fuego, Argentina) se encuentra en el sistema de canales fueguinos que representa el ambiente marino subantártico costero más estrechamente relacionado con la Antártida. Además, el Canal Beagle constituye una vía de intercambio de fauna y flora ente los océanos Pacífico y Atlántico. El objetivo de este trabajo fue determinar la composición, abundancia y biomasa del macrozoobentos en el Canal Beagle como también la producción secundaria de los ensambles bentónicos. Durante 1999 y 2000, en forma estacional, en tres áreas diferentes y en dos rangos de profundidad: 40m y 70m, se tomaron muestras del macrozoobentos mediante el uso de una rastra epibentónica. Los organismos se identificaron y cada taxón se contó y pesó para determinar...
Tipo: Theses and Dissertations
Palavras-chave: Zoobenthos; Seasonal distribution; Abundance; Biomass; Secondary production; Marine environment; Biomass; Marine environment; Zoobenthos; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_15487.
Ano: 2006
URL: http://hdl.handle.net/1834/3545

The production of &lt;i&gt;Cyprideis torosa&lt;/i&gt; Jones 1850 (Crustacea, Ostracoda)
Provedor de dados: 27
Autores: Herman, P.M.J.; Heip, C.H.R.; Vranken, G.
The ostracod &lt;i&gt;Cyprideis torosa&lt;/i&gt; Jones,1985 is a dominant species in the meiofauna of brackish water habitats. Its production in the field over a five-year period has been calculated using two production models. The first model uses the age-distribution of shells preserved in the sediment to assess the stage-specific mortality rates and the stage durations. The second model is the size-frequency model, modified for use with development stages instead of size-classes. Productions calculated with both methods agree very well. Their values are 9.7 and 9.2 g dwt.m&lt;sup&gt;-2&lt;/sup&gt;y&lt;sup&gt;-1&lt;/sup&gt; respectively. The yearly P/B-ratio is 2.7 or 2.6y&lt;sup&gt;-1&lt;/sup&gt;, production efficiency P/A is 0.38 or 0.37. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Secondary production; Cyprideis torosa.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3396