Primary productivity in the northern Canary Islands region as inferred from SeaWiFS imagery

Davenport, Robert; Neuer, Susanne; Helmke, Peer; Pérez-Marrero, J.; Llinás, O.

doi:10.1016/s0967-0645(02)00095-4

Cited by 80 publications

(85 citation statements)

References 29 publications

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“…1), trap data (e.g., Davenport et al, 1999Davenport et al, , 2002Neuer et al, 2002) and as shown in several studies (e.g., García-Muñ oz et al, 2004 and references therein; Eberwein and Mackensen, 2006). Thereby highest production occurs under upwelling conditions mainly on the African shelf and is most pronounced around the capes, especially at Cape Blanc which shows the highest amounts of primary productivity (Fig.…”

Section: Organic Matter and C/n Ratiosupporting

confidence: 53%

“…The development and growth of the larger, permanent filaments seems to be related to changes in topography such as headlands (Strub et al, 1991). Large filaments such as those found at Cape Ghir, Cape Yubi, Cape Bojador, Cape Blanc and Mauritania (20.81N) are observable as colder jets and meanders extending several hundreds of kilometres offshore (Van Camp et al, 1991;Nykjaer and Van Camp, 1994;Barton et al, 1998;Davenport et al, 1999Davenport et al, , 2002Barton and Arístegui, 2004). Although upwelling occurs mostly on the shelf, these filaments play an important role in carbon cross-shelf transport and export to the deep ocean as has been described by Strub et al (1991), Gabric et al (1993) and Barton et al (1998).…”

Section: Introductionmentioning

confidence: 99%

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Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Plewa

Meggers

Kuhlmann

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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a b s t r a c tOne hundred and twenty-eight surface-sediment samples collected off North-West Africa were studied geochemically to detect the expressions of different meridional climate regimes and zonal productivity gradients in the surface sediments. This geochemical multi-tracer approach, coupled with additional information on the bulk carbonate and TOC contents makes it possible to characterise the sedimentological regime in detail. Typical terrigenous elements like Al, K and Fe mirror the importance of the humid (fluvial) influence in the north of the study area and the dominance of aeolian input in the south. Furthermore, the distributions of Ti and Fe in the surface sediments serve as tracers for the supply of eolian volcanic material from the Canary Islands. The spatial variability of the TOC contents in the surface sediments closely follows the ocean surface productivity patterns, whereas the CaCO 3 contents are mainly controlled by dilution with terrigenous matter. The potential productivity proxy Ba is not a reliable tracer for productivity in this region, since it is mainly supplied by terrigenous input (coupled with aluminosilicates).

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Section: Organic Matter and C/n Ratiosupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Plewa

Meggers

Kuhlmann

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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“…In turn, quasi-permanent filaments advected westward away from the north-eastern African coasts are common (Davenport et al, 2002), thus allowing a considerable degree of connectivity between the Canary Islands and the adjacent continental coasts, likely sustaining high immigration rates to this archipelago (Whittaker & Ferna´ndez-Palacios, 2007). On the above basis, we would anticipate that one would observe greater algal diversity at Madeira than the Azores; the absence of such a pattern is likely to be due to the larger coastal area of the Azores (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Secondly, the Canarian Archipelago lies in the transition between the northwest African upwelling and the oligotrophic open ocean (the so-called Northwest African Coastal Transition Zone). Considerable spatial variation in sea surface temperature occurs across an east-west gradient perpendicular to the African coast, with an average difference of 2 C between the eastern and western islands (Davenport et al, 2002). As a result of this meso-scale variability, marine assemblages at widely separated islands of this archipelago (100 s of km) are subjected to different oceanographic conditions, that produce differences in the composition (Haroun et al, 2003) and structure (Tuya & Haroun 2006) of macroalgae between the eastern and western islands.…”

Section: Discussionmentioning

confidence: 99%

Phytogeography ofLusitanianMacaronesia: biogeographic affinities in species richness and assemblage composition

Tuya

Haroun

2009

European Journal of Phycology

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Analysis of biogeographic affinities is a key tool to establish and improve the resolution of hierarchical biogeographic systems. We describe patterns of species richness of the marine macroalgal flora across Lusitanian Macaronesia (Azores, Madeira, the Salvage Islands and the Canary Islands), and test (i) whether such differences are related to differences in proximity to the nearest continental shore and size among islands. We also explore biogeographic affinities in the composition of macroalgal assemblages (¼ presence/absence of each taxon in multivariate datasets) to determine (ii) whether each archipelago is a biogeographic unit within this ecoregion and (iii) whether patterns in assemblage composition are related to proximity (i.e. distances) among islands. Presence/absence matrices were created to test and visualize multivariate affinities among archipelagos. A total of 872 taxa were compiled. Species richness peaked at the Canary Islands and decreased towards the Azores; the pattern matched a progressive increase in distance from the nearest continental shores, matching the classical island biogeography theory. Intra-archipelago differences in species richness were largely related to variations in island size. Biogeographic similarities among archipelagos were hierarchically structured. Madeira and the Salvage Islands constituted one biogeographic unit. Floras from the Azores, Madeira and the Salvage Islands were barely separable from each other, but were different from those at the Canary Islands. Such biogeographic similarities among islands were negatively correlated with the geographical separation (i.e. distances) among them. Proximity to nearby continental shores, in conjunction with large-and meso-scale oceanographic patterns, seems to interact to create patterns in richness and composition of algal assemblages across Lusitanian Macaronesia.

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“…Using chlorophyll, many rigorous studies show an inverse relationship between phytoplankton and sea surface temperature (SST). [5][6][7][8][9][10][11][12] Puzzlingly, in the Bay of Bengal region ( Figure 1 ), a positive relationship has been observed between phytoplankton and SST. 3,[13][14][15][16][17] This apparently contradictory relationship between Bay of Bengal SST and phytoplankton has led to the assertion that, in a warming climate scenario, increasing SST will lead to increasing phytoplankton and thus more cholera outbreaks globally.…”

Section: Introductionmentioning

confidence: 99%

Warming Oceans, Phytoplankton, and River Discharge: Implications for Cholera Outbreaks

Jutla

Akanda²,

Griffiths³

et al. 2011

The American Society of Tropical Medicine and Hygiene

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Abstract. Phytoplankton abundance is inversely related to sea surface temperature (SST). However, a positive relationship is observed between SST and phytoplankton abundance in coastal waters of Bay of Bengal. This has led to an assertion that in a warming climate, rise in SST may increase phytoplankton blooms and, therefore, cholera outbreaks. Here, we explain why a positive SST-phytoplankton relationship exists in the Bay of Bengal and the implications of such a relationship on cholera dynamics. We found clear evidence of two independent physical drivers for phytoplankton abundance. The first one is the widely accepted phytoplankton blooming produced by the upwelling of cold, nutrient-rich deep ocean waters. The second, which explains the Bay of Bengal findings, is coastal phytoplankton blooming during high river discharges with terrestrial nutrients. Causal mechanisms should be understood when associating SST with phytoplankton and subsequent cholera outbreaks in regions where freshwater discharge are a predominant mechanism for phytoplankton production.

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Primary productivity in the northern Canary Islands region as inferred from SeaWiFS imagery

Cited by 80 publications

References 29 publications

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Phytogeography ofLusitanianMacaronesia: biogeographic affinities in species richness and assemblage composition

Warming Oceans, Phytoplankton, and River Discharge: Implications for Cholera Outbreaks

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