Results 101 to 110 of about 3,457 (217)

Aquatic macrophytes in Doñana protected area (SW Spain) : an overview [PDF]

open access: yes, 2006
A big portion of the Doñana protected areas corresponds to wetlands; in them aquatic macrophytes are the main primary producers and play also other important ecological functions.
Cirujano Bracamonte, Santos   +3 more
core  

Diversidad de fitoplancton y estado trófico actual de un lago de alta montaña de la provincia de Imbabura, Ecuador

open access: yesACI Avances en Ciencias e Ingenierías
El objetivo de la presente investigación fue determinar la diversidad de fitoplancton y, con base en su composición, establecer el estado trófico actual del lago San Pablo.
Andrés Arévalo   +2 more
doaj   +1 more source

Palaeobiology of Early Carboniferous lacustrine biota of the Waaipoort Formation (Witteberg Group), South Africa [PDF]

open access: yes, 1999
The Early Carboniferous (Visean) Waaipoort Formation (Cape Supergroup, Witteberg Group) is a heterolithic sandstone dominated formation containing apatite-rich and calcite-rich fossiliferous nodules.
Evans, F J
core  

The Netherlands’ Charophyta

open access: yes, 1938
The Charophyta of the Netherlands have been hitherto almost neglected. As far as I know only the following papers are dealing with the matter: VAN DEN BOSCH, R. B., in Ned. Kruidk. Archief 1, 1846, p. 100, p. 289. “II 1851 p. 225. both preliminary works to Prodromus Florae Batavae II, 2, 1853, p. 186—189.
openaire   +1 more source

Colectores de algas de México (1787-1954)

open access: yesActa Botanica Mexicana, 2008
Se presenta información biográfica y bibliográfica de los colectores de algas de México durante el período de 1787-1954. Los datos fueron obtenidos mediante la consulta de herbarios nacionales y extranjeros, la comunicación directa con los curadores de
Jos\u00E9 Luis God\u00EDnez Ortega
doaj  

Some preliminary experiments on physiology of Charophyta

open access: yesActa Botanica Croatica, 1929
1. The rliizoids represent the main organs of absorption of nutritive materials by Charophyta. The stem i. e. thallus surface has in this respect but a subordinate function. They can therefore as far as absorption is concerned be compared to the phanerogamous submerse water-plants. 2.
Vouk, Vale, Benzinger, Franjo
openaire   +1 more source

ANCIENT COASTAL ENVIRONMENTS IN A MAASTRICHTIAN - ?PALEOCENE ATLANTIC SHORELINE: A PHYTOPLANKTON APPROACH

open access: yesPublicación Electrónica de la Asociación Paleontológica Argentina, 2016
. In this contribution we describe planktonic assemblages, comprising their taxonomic composition and palaeoecological attributes, from the La Colonia Formation, Patagonia, Argentina. The palynological samples are from the section exposed at Estancia San
C. Marcela Borel   +3 more
doaj  

Preliminary Archaeopetrological Study of the Lithic Industry From the l’Hort de la Boquera Rock Shelter (Margalef de Montsant, Tarragona, Spain): Applying Mineralogical and Geochemical Techniques

open access: yesArchaeologia Polona, 2018
The l’Hort de la Boquera site is located in the northeastern part of Iberia and its stone tool assemblage includes up to 25,000 flint artefacts. This is the first approach to the analysis of the raw material through an archaeopetrological study.
Mar Rey-Solé   +5 more
doaj  

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