2024-03-29T07:37:09Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/443742018-07-10T07:37:07Zcom_10261_88com_10261_8col_10261_341
Factors influencing the variability of pigments in the surface sediments of mountain lakes
Buchaca, Teresa
Catalán, Jordi
Pyrenees palaeolimnology
Sediment
Biofilms
High mountain lakes
Marker pigments
15 páginas, 5 figuras, 4 tablas.
1. Surface sediment biofilm samples from 82 Pyrenean lakes were analysed for marker
pigment composition using high performance liquid chromatography (HPLC).
2. Variability in the pigment composition among lakes was investigated by multivariate
statistical analyses using a large data set of factors describing lake chemical, physical,
morphological and catchment characteristics.
3. Due to the widely varying light penetration in the lakes, the most significant gradient of
pigment composition extended from a benthic to a planktonic signal. The most important
pigments in the gradient were alloxanthin (cryptophytes marker pigment, planktonic
signal) and diatoxanthin (diatoms marker pigment, benthic signal). The molar ratio
between these two marker pigments was positively correlated with lake depth.
4. Chlorophyll-a preservation was found to be positively related to light penetration and
the development of an autothrophic biofilm on the surface sediment and negatively related
to decreasing pH and the percentage of alpine meadows in the lake catchments.
5. Zooplankton marker pigments in the surface sediment, including grazing by-products
(e.g. phaeophorbides) and carotenoids (astaxanthin, canthaxanthin, echinenone) incorporated
into their tissues, were correlated with the areal abundance of zooplankton.
6. Marker pigments for photosynthetic bacteria, BChl-e and okenone, were found mainly in
relatively shallow lakes with large catchments that are forested, probably because of their
higher loading of allochthonous organic matter.
7. The evaluation of a preservation index (Chl-a expressed as a percentage of a-phorbins)
and the alloxanthin/diatoxanthin ratios throughout the sediment record of mountain lakes
can provide evidence of historical changes in the relative importance of planktonic versus
benthic primary production and might ultimately be interpreted in terms of climatic or
environmental changes.
The study was
supported by the European Union within the framework
of the EMERGE (Contract No. EVK1-CT-1999-
00032) and EUROLIMPACS (GOCE-CT-2003-505540).
Peer reviewed
2012-01-17T12:20:28Z
2012-01-17T12:20:28Z
2007
artículo
http://purl.org/coar/resource_type/c_6501
Freshwater Biology 52 : 1365-1379 (2007)
0046-5070
http://hdl.handle.net/10261/44374
10.1111/j.1365-2427.2007.01774.x
en
http://dx.doi.org/10.1111/j.1365-2427.2007.01774.x
none
Blackwell Publishing