Published in Hydrobiologia
Artificial substrata have been used in diatom studies for almost 100 years. However, concern still exists over whether diatom communities developing on artificial substrata accurately represent communities developing on natural substrata. This study compares the diatom communities colonising glass slides and clay tiles in two coastal dune lakes, an...
This thesis consists of two papers that examine the sedimentation history of the continental shelf of the Central California coast. The first paper is the outcome of a collaborative project between the U.S. Geological Survey and Moss Landing Marine Laboratories. It examines the implications of sediment accumulation rates that are based on profiles ...
Published in Wetlands
A cluster of artesian springs encircled by mounds of marsh and wet meadows was discovered near the equator in Kenya, East Africa. Each spring is capped by a dense fibrous root mat that covers a mound of clayey peat with a blister of water in the center. Individual mounds are ∼15 m wide, 1–2 m high, and affect an area of ∼50 m2. The central water-bl...
Lake Abiyata is a small, closed, saline-alkaline lake located in the central part of the Ethiopian Rift Valley, East Africa. A multi-proxy study of a sediment core, 116 cm long and with undisturbed mud-water interface, was performed to test the sensitivity of the lake system and of different proxies to the changes in climate and human activities th...
Published in Hydrobiologia
A three-dimensional general circulation model has been developed to investigate mixing processes in Lake Baikal, Siberia. Emphasis is placed on the 4–5-month period when the lake is completely ice-covered, a time of particular importance to the re-population of the lake by diatoms. The model represents the top 250 m and includes a new mixing scheme...
Le cycle biogéochimique du silicium en milieu marin a été étudié dans divers systèmes océaniques et côtiers, oligotrophes à mésotrophes, en Méditerranée (campagnes SOFi, ALMOFRONT II, PROSOPE), en Atlantique Nord-Est (campagne POMME), et dans la zone HNLCLSi (High Nutrient Low Chlorophyll Low Silicate) du secteur Indien de l’Océan Austral (campagne...
Published in Photosynthesis Research
The dominance of diatoms in turbulent waters suggests special adaptations to the wide fluctuations in light intensity that phytoplankton must cope with in such an environment. Our recent demonstration of the unusually effective photoprotection by the xanthophyll cycle in diatoms [Lavaud et al. (2002) Plant Physiol 129 (3) (in press)] also revealed ...
Published in Water, Air, and Soil Pollution
Sediment cores and surface sediments from fourteen lakes locatedalong three pollution gradients in the Usa basin, north-east European Russia were analysed for diatoms, spheroidal carbonaceous particles, trace metals and water chemistry. At each site past pH was inferred using a diatom-based transfer function and critical loads for sulphur depositio...
Published in Russian Journal of Marine Biology
The diatom Pseudo-nitzschia americana (Hasle) Fryxell was found in bathometric phytoplankton samples collected in Amurskii Bay, Sea of Japan, and in coastal areas of Sakhalin Island, Sea of Okhotsk, in different seasons from 1994 to 2000. This is the first finding of this species in Russian seas. A morphological description is provided, including d...
Published in Russian Journal of Marine Biology
The growth of the diatom alga Thalassiosira pseudonana was studied when exposed to an environment polluted by a detergent. We determined concentrations that inhibit cell division (10 mg/l) instead of algae growth (0.1 and 1 mg/l. It was shown that T. pseudonana can adapt to high detergent concentrations. The stimulation of the growth of Thalassiosi...
