The Benguela Current: An ecosystem of four components

Hutchings, L.; Lingen, Carl D. van der; Shannon, Lynne J.; Crawford, Robert J. M.; Verheye, Hans M.; Bartholomae, Chris Hans; Plas, Anja K. van der; Louw, Deon C.; Kreiner, Anja; Ostrowski, Marek; Fidel, Quilanda; Barlow, Raymond G; Lamont, Tarron; Coetzee, Janet C.; Shillington, F. A.; Veitch, Jennifer A.; Currie, Jock C.; Monteiro, Pedro M. S.

doi:10.1016/j.pocean.2009.07.046

Cited by 357 publications

(327 citation statements)

References 26 publications

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“…Benguela, Humboldt, California, Canary) where the local atmospheric circulation drives an offshore transport of surface waters (i.e. Eckman transport) that are replaced by nutrient-rich subsurface waters [Hutchings et al 2009]. …”

Section: Introduction Seabirds and Their Environmentmentioning

confidence: 99%

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Implications for seabirds off South Africa of a long-term change in the distribution of sardine

Crawford¹,

Sabarros²,

Fairweather³

et al. 2008

African Journal of Marine Science

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Section: Introduction Seabirds and Their Environmentmentioning

confidence: 99%

“…In upwelling systems, climate change and other perturbations induced by human activity (e.g. overfishing) may affect the whole food chain via the intermediate level [Cury et al 2000[Cury et al , 2003 and ultimately induce a critical ecosystem shift such as it occurred in Namibia [Hutchings et al 2009]. …”

Section: Introduction Seabirds and Their Environmentmentioning

confidence: 99%

Implications for seabirds off South Africa of a long-term change in the distribution of sardine

Crawford¹,

Sabarros²,

Fairweather³

et al. 2008

African Journal of Marine Science

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“…The 1960 were characterized by weak upwelling favorable winds [58]; during the 1970s to 1990s, an increase in upwelling was observed along the Luderitz at ~26° off the west coast of Africa resulting in colder water temperatures, increased nutrients and chlorophyll concentrations close to the coast [57][58][59][60]. In the 1990s decreased wind stress, upwelling and increasing temperatures were observed along the northern Benguela current system [58,59,61]. It is perhaps, indicative that 3 Benguela Ninos occurred from 1960s to 1990 period and that 4 Benguela Ninos occurred during the 1990s [56] suggesting a weakening of the Southeast Trades in the latter decade compared to earlier decades.…”

Section: Oscillations In Gyre Circulation and Upwellingmentioning

confidence: 99%

Decadal Patterns of Westerly Winds, Temperatures, Ocean Gyre Circulations and Fish Abundance: A Review

Oviatt

Smith

McManus

et al. 2015

Climate

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Abstract:The purpose of this review is to describe the global scope of the multidecadal climate oscillations that go back at least, through several hundred years. Literature, historic data, satellite data and global circulation model output have been used to provide evidence for the zonal and meridional jet stream patterns. These patterns were predominantly zonal from the 1970s to 1990s and switched since the 1990s to a meridional wind phase, with weakening jet streams forming Rossby waves in the northern and southern hemispheres. A weakened northern jet stream has allowed northerly winds to flow down over the continents in the northern hemisphere during the winter period, causing some harsh winters and slowing anthropogenic climate warming regionally. Wind oscillations impact ocean gyre circulation affecting upwelling strength and pelagic fish abundance with synchronous behavior in sub Arctic gyres during phases of the oscillation and asynchronous behavior in subtropical gyres between the Atlantic and Pacific oceans.

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“…Descriptions of the environmental dynamics in the NBUS are given by Shannon (1985), Mohrholz et al (2001), Monteiro et al (2008) and Hutchings et al (2009). The hydrographic conditions during the sampling periods are described in Buchholz et al (2010; report of cruise D356) and Lahajnar et al (2011; report of cruise MSM17/3).…”

Section: Hydrographic and Trophic Conditionsmentioning

confidence: 99%

Life in the sea of plenty: Seasonal and regional comparison of physiological performance of Euphausia hanseni in the northern Benguela upwelling system

Werner

Buchholz

Búchholz

2015

Journal of Sea Research

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Variability in upwelling events may lead to periods of constrained food availability in the northern Benguela upwelling system (NBUS), thereby affecting the physiological state and metabolic activity of euphausiids. Most attention has so far been paid to seasonal effects but little is known about regional variability. Metabolic activity (expressed by respiration and excretion rates) and physiological state (expressed by reproductive effort and moult activity) in Euphausia hanseni were examined at different stations during austral summer (minimum upwelling) and austral winter (maximum upwelling). Overall, regional differences in physiological state, influencing metabolic activity, were greater than seasonal ones, indicating favourable conditions for growth and reproduction year-round. Higher respiration rates were found for females in more advanced stages of sexual development. Moult stage did not affect oxygen consumption rates, however. The physiological state of E. hanseni at the time of capture may serve as a meaningful indicator of the associated hydrographic conditions in the NBUS, to be further used in eco-system analysis on seasonal or long-term time scales. A latitudinal comparison of species highlights the extraordinary physiological plasticity of euphausiids.

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The Benguela Current: An ecosystem of four components

Cited by 357 publications

References 26 publications

Implications for seabirds off South Africa of a long-term change in the distribution of sardine

Implications for seabirds off South Africa of a long-term change in the distribution of sardine

Decadal Patterns of Westerly Winds, Temperatures, Ocean Gyre Circulations and Fish Abundance: A Review

Life in the sea of plenty: Seasonal and regional comparison of physiological performance of Euphausia hanseni in the northern Benguela upwelling system

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