Search results for: C.L. Moloney

Items from 1 to 8 out of 8 results

article

Micronekton diel migration, community composition and trophic position within two biogeochemical provinces of the South West Indian Ocean: Insight from acoustics and stable isotopes

P. Annasawmy, J.F. Ternon, F. Marsac, Y. Cherel, more

Deep Sea Research Part I: Oceanographic Research Papers > 2018 > 138 > C > 85-97

Spatial distribution, community composition and trophic roles of micronekton (crustaceans, fishes and squids) were investigated in the Indian South Subtropical Gyre (ISSG) province and the East African Coastal province (EAFR), by combining acoustic surveys, mid-water trawls and stable isotope analyses from scientific cruises conducted in 2009 and 2010. Mesopelagic micronekton performed diel vertical...

article

Fast growth inferred for northern Benguela shallow-water hake Merluccius capensis using annual survey- and monthly commercial length-frequency distributions

M.R. Wilhelm, C.L. Moloney, S. Paulus, J-P. Roux

Fisheries Research > 2017 > 193 > C > 7-14

The hypothesis that fast growth rates demonstrated for 3–21-month-old Merluccius capensis continue for older fish is tested. Cohort-specific growth rates of M. capensis between 6 and 65cm total length were described using a von Bertalanffy growth function (VBGF) fitted to annual/bi-annual research survey length-frequency distributions (LFDs) from 1995 to 2011 and monthly commercial LFDs from 1998...

article

Suppressing and enhancing effects of mesoscale dynamics on biological production in the Mozambique Channel

Y.S. José, P. Penven, O. Aumont, E. Machu, more

Journal of Marine Systems > 2016 > 158 > C > 129-139

We used a coupled physical–biogeochemical model to investigate how the strong eddy activity typical of the Mozambique Channel affects biological production. A numerical experiment was carried out, in which mesoscale dynamics were suppressed by cancelling the nonlinear terms for horizontal momentum in the Naviers–Stokes equation.Mesoscale dynamics were found to be responsible for (1) increased offshore...

article

Cool, elevated chlorophyll-a waters off northern Mozambique

B.S. Malauene, F.A. Shillington, M.J. Roberts, C.L. Moloney

Deep-Sea Research Part II > 2014 > 100 > Complete > 68-78

Direct in-situ observations from a shallow underwater temperature recorder on the continental shelf and from a shipboard oceanographic survey, were combined with MODIS satellite data (sea surface temperature and chlorophyll-a) to assess the temporal and spatial variability of temperature and chlorophyll-a in the Mozambique Channel near the coastal town of Angoche, 16°S. Intermittent, relatively cool...

article

Influence of mesoscale eddies on biological production in the Mozambique Channel: Several contrasted examples from a coupled ocean-biogeochemistry model

Y.S. José, O. Aumont, E. Machu, P. Penven, more

Deep-Sea Research Part II > 2014 > 100 > Complete > 79-93

The impact of mesoscale activity on phytoplankton and nutrient distribution in the Mozambique Channel was simulated by coupling a biogeochemical model (PISCES) with a regional oceanic model (ROMS). Examples of the effects of eddies on the biogeochemistry of the Mozambique Channel are presented to illustrate the complexity of the system. In the model, several cyclonic eddies were found with low concentrations...

article

Transdisciplinary co-operation for an ecosystem approach to fisheries: A case study from the South African sardine fishery

B. Paterson, M. Isaacs, M. Hara, A. Jarre, more

Marine Policy > 2010 > 34 > 4 > 782-794

Integrative approaches that involve natural and social scientists are needed to manage fisheries, but these are difficult to achieve. The process of developing a prototype, knowledge-based, electronic decision support tool for the South African sardine Sardinops sagax fishery provided a platform for fostering collaboration and achieving active participation of many stakeholders. The aim of the decision...

article

Trophodynamic indicators for an ecosystem approach to fisheries

P.M. Cury, L.J. Shannon, J-P. Roux, G.M. Daskalov, more

ICES Journal of Marine Science > 2005 > 62 > 3 > 430-442

Acknowledging ecological interactions, such as predation, is key to an ecosystem approach to fisheries. Trophodynamic indicators are needed to measure the strength of the interactions between the different living components, and of structural ecosystem changes resulting from exploitation. We review trophodynamic indicators derived from models, as well as from emergent patterns such as trophic cascades...

article

Sampling and analysis of gut contents in relation to environmental variability and diel vertical migration by herbivorous zooplankton

C.L. Moloney, M.J. Gibbons

Oceanographic Literature Review > 1997 > 44 > 4 > 345

The accuracy of standard sampling and analysis procedures for estimating ingestion by herbivorous zooplankton was assessed using models. Data were sampled from the model output, similar to field sampling of mesozooplankton grazing. The sample results were compared with the actual ingestion values in the model, and some causes of discrepancies were noted. An analysis procedure is described that...

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