Review of gross community production, primary production, net community production and dark community respiration in the Gulf of Lions

Lefèvre, D.; Minas, H. J.; Minas, M.; Robinson, Carol; Williams, Peter; Woodward, E. Malcolm S.

doi:10.1016/s0967-0645(96)00091-4

Cited by 125 publications

(104 citation statements)

References 12 publications

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“…Bioavailable organic C pools as well as their nutritional value (in terms of the relative importance of enzymatically digested proteins to the bioavailable C pools) were significantly higher in May 2004 than in the other sampling periods in both environments, Cap de Creus canyon and the adjacent open slope. This difference, also observed in other canyons nearby the Gulf of Lion (Lopez-Fernandez et al, 2013), may be attributed to the phytoplankton spring bloom reported for the NW Mediterranean (Estrada et al, 1996;Lefevre et al, 1997). We can therefore infer that, according to the optimal foraging theory (McArthur and Pianka, 1966), in spring deep-sea detritus feeders would need to ingest less material than in summer/early autumn to get the optimal quantity and quality of labile food.…”

Section: Discussionsupporting

confidence: 53%

“…1 m s −1 Palanques et al, 2012) conveying large amounts of organic material into Cap de Creus canyon and the adjacent southern open slope Sanchez-Vidal et al, 2008Pasqual et al, 2010). Primary production in the Gulf of Lion ranges between 78 and 142 g C m −2 yr −1 (Lefevre et al, 1997). In the Portuguese margin, sediments were collected at eight stations, four of which located within the Nazarè canyon and four in the adjacent open slope area.…”

Section: Study Areas and Sampling Strategymentioning

confidence: 99%

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Trophic state of benthic deep-sea ecosystems from two different continental margins off Iberia

et al. 2013

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The bioavailability of organic matter in benthic deep-sea ecosystems, commonly used to define their trophic state, can greatly influence key ecological processes such as biomass production and nutrient cycling. Here, we assess the trophic state of deep-sea sediments from open slopes and canyons of the Catalan (NW Mediterranean) and Portuguese (NE Atlantic) continental margins, offshore east and west Iberia, respectively, by using a biomimetic approach based on enzymatic digestion of protein and carbohydrate pools. Patterns of sediment trophic state were analyzed in relation to increasing water depth, including repeated samplings over a 3 yr period in the Catalan margin. Two out of the three sam- pling periods occurred a few months after dense shelf water cascading events. The benthic deep-sea ecosystems investi- gated in this study were characterized by high amounts of bioavailable organic matter when compared to other deep- sea sediments. Bioavailable organic matter and its nutritional value were significantly higher in the Portuguese margin than in the Catalan margin, thus reflecting differences in pri- mary productivity of surface waters reported for the two re- gions. Similarly, sediments of the Catalan margin were char- acterized by significantly higher food quantity and quality in spring, when the phytoplankton bloom occurs in surface wa- ters, than in summer and autumn. Differences in the benthic trophic state of canyons against open slopes were more ev- ident in the Portuguese than in the Catalan margin. In both continental margins, bioavailable organic C concentrations did not vary or increase with increasing water depth. Overall our findings suggest that the intensity of primary production processes along with the lateral transfer of organic particles, even amplified by episodic events, can have a role in controlling the quantity and distribution of bioavailable organic detritus and its nutritional value along these continental margin ecosystems

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Section: Discussionsupporting

confidence: 53%

Section: Study Areas and Sampling Strategymentioning

confidence: 99%

Trophic state of benthic deep-sea ecosystems from two different continental margins off Iberia

et al. 2013

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“…In contrast, the mean atmospheric pCO 2 during THRESHOLDS 2007 was 371 µatm (mean sea-air difference −18±4 ppm,Álvarez, unpublished data), implying that the Mediterranean Sea acted as a sink for atmospheric CO 2 , possibly a legacy from the late winter-early spring bloom preceding this cruise. Some pub- lished works reported the presence of late winter (FebruaryMarch) phytoplankton blooms Navarro et al, 2004;Agusti and Duarte, 2000;Lefèvre et al, 1997). Lefèvre et al (1997) explained that in winter the Rhône River water moves rapidly westwards, providing fresh nutrients into the Gulf of Lion, and giving rise to a winter diatom bloom.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, it is unclear whether the reported gradient in primary production may lead to a similar west-east gradient in net community production. Yet, whether a West-East gradient in net community production exists in the Mediterranean Sea has not yet been resolved, due to a paucity of reports on planktonic metabolism in the Mediterranean Sea, particularly on the Eastern basin, as the bulk of the data available derive from the Western basin, with a dominance of studies in coastal waters (Gulf of Lions, González et al, 2008;Lefèvre et al, 1997; Bay of Blanes, Duarte et al, 2004;Lucea et al, 2005;Alboran Sea, Van Wambeke et al, 2004;Majorca Island, González et al, 2008;Gazeau et al, 2005;Navarro et al, 2004). Moreover, the magnitude of gross primary production and community respiration and the possible correlation between these processes in the Mediterranean Sea remains poorly resolved.…”

Section: Correspondence Tomentioning

confidence: 99%

Patterns in planktonic metabolism in the Mediterranean Sea

2009

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Abstract. Planktonic gross community production (GPP), net community production (NCP) and community respiration (CR) across the Mediterranean Sea was examined in two cruises, THRESHOLDS 2006 and 2007, each crossing the Mediterranean from West to East to test for consistent variation along this longitudinal gradient in late spring to early summer. GPP averaged 2.4±0.4 mmol O 2 m −3 d −1 , CR averaged 3.8±0.5 mmol O 2 m −3 d −1 , and NCP averaged -0.8±0.6 mmol O 2 m −3 d −1 across the studied sections, indicative of a tendency for a net heterotrophic metabolism in late spring to early summer, prevalent across studied sections of the Mediterranean Sea as reflected in 70% of negative NCP estimates. The median P /R ratio was 0.6, also indicating a strong prevalence of heterotrophic communities (P /R<1) along the studied sections of the Mediterranean Sea. The communities tended to be net heterotrophic (i.e. P /R<1) at GPP less than 2.8 mmol O 2 m −3 d −1 . The Western Mediterranean tended to support a higher gross primary production and community respiration than the Eastern basin did, but these differences were not statistically significant (ttest, p > 0.05). The net heterotrophy of the studied sections of the Mediterranean Sea indicates that allochthonous carbon should be important to subsidise planktonic metabolism during the late spring.

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“…In contrast, the Cap de Creus canyon is a relatively short (96 km), shallowly incised (500-700 m) wide (~600 m thalweg width) canyon, in which the sediment transport is driven by dense shelf water downwelling and cascading. Besides, the Cap de Creus canyon is located under an area of relatively low surface productivity (78 to 142 g C m -2 y -1 ) (Lefevre et al, 1997) and has a larger continental shelf.…”

Section: Cap De Creus Canyon Benthic Foraminifera In Comparison To Otmentioning

confidence: 99%

Living deep-sea benthic foraminifera from the Cap de Creus Canyon (western Mediterranean): Faunal–geochemical interactions

Contreras-Rosales

Koho

Duijnstee

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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Review of gross community production, primary production, net community production and dark community respiration in the Gulf of Lions

Cited by 125 publications

References 12 publications

Trophic state of benthic deep-sea ecosystems from two different continental margins off Iberia

Trophic state of benthic deep-sea ecosystems from two different continental margins off Iberia

Patterns in planktonic metabolism in the Mediterranean Sea

Living deep-sea benthic foraminifera from the Cap de Creus Canyon (western Mediterranean): Faunal–geochemical interactions

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