Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
| one publication added to basket [59986] |
In situ measurements of benthic primary production during emersion: seasonal variations and annual potential production in the bay of Somme (Eastern English Channel, France)
Migné, A.; Spilmont, N.; Davoult, D. (2004). In situ measurements of benthic primary production during emersion: seasonal variations and annual potential production in the bay of Somme (Eastern English Channel, France). Cont. Shelf Res. 24(13-14): 1437-1449. http://dx.doi.org/10.1016/j.csr.2004.06.002
In: Continental Shelf Research. Pergamon Press: Oxford; New York. ISSN 0278-4343; e-ISSN 1873-6955, meer
|  |
| Trefwoord |
|
| Author keywords |
Intertidal environment; Microphytobenthos; Photosynthesis; Primary production; Irradiance; Temperature; France; Eastern English Channel; Bay of Somme |
| Auteurs | | Top |
- Migné, A., meer
- Spilmont, N.
- Davoult, D., meer
|
|
|
| Abstract |
A survey of benthic primary production during periods of emersion was performed in a muddy-sand station of the Bay of Somme. Primary production and respiration were estimated by in situ measurements of carbon dioxide fluxes using infra-red analysis. Photosynthetic response of the community to incident light and temperature was analysed at different periods of the year. Seasonal variations of the photosynthetic parameters were estimated using the photosynthesis versus irradiance (P–I) curves constructed in February, April, July, August and October. The rate of maximum gross community primary production (Pm), highly correlated to sediment chlorophyll a (Chl a) content, was low in February (6.7 mg C m-2 h-1) and high in July (97.7 mg C m-2 h-1). Photosynthetic efficiency at low light intensity (a) was positively correlated to Pm. The very high production (Pm=126.8 mg C m-2 h-1) and productivity (ratio of Pm and sediment Chl a content) measured in March may be related to the set down of active planktonic microalgae. At five dates, the effects of temperature on primary production seemed to overshadow the role of light. The Q10 for primary production varied from 1.2 in August to 3.0 in December. Daily potential primary production was calculated as a function of theoretical and measured irradiance for the period of superimposition of day and emersion. At the annual scale, the potential gross community primary production was 147 g C m-2 with theoretical irradiance and 110 g C m-2 with measured irradiances. The annual community respiration was 188 g C m-2, leading to a heterotrophic annual budget. The annual pattern of daily production can be largely explained by changes in day length. It is also characterized by a fortnightly variability due to the variation of the total daily irradiance available for photosynthesis caused by the superimposition of the tidal and day/night cycles. Finally, sharp variations occurring with nebulosity can overshadow this fortnightly variability. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
