1,721,200 research outputs found
Book Reviews - V. Krishnamurthy. Algae of India and neighbouring countries. I. Chlorophycota
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Reproduction and life history of the green alga Prasiola linearis Jao (Trebouxiophyceae, Chlorophyta)
No full textMarine species of Prasiola are most common on rocky shores of the North Atlantic and North Pacific Oceans. Prasiola linearis is a little-known member of this group, whose known distribution is restricted to coastal marshes of Pacific North America. The little information available on this species is mostly based on the original description; its life history has not been previously reported. Reproduction and life history were investigated in a series of experiments conducted in different combinations of culture medium, temperature, daylength and photon irradiance. The alga reproduced by aplanospores that were produced in the apical part of the blade. Upon release, each aplanospore reproduced a new thallus; sexual reproduction, which occurs in other marine species of Prasiola (P. stipitata and P. meridionalis) was not observed in P. linearis. No variation in reproductive patterns was observed between different combinations of factors tested; however, the alga showed very weak growth at 20°C. The life history of Prasiola linearis consists of a repetition of the same morphological phase reproducing by aplanospores. The diversity of life histories observed in marine species of Prasiola is illustrated and discussed
A review of the recent literature on medical and pharmaceutical uses of seaweeds
No full textRelazione tecnica per il Marine Institute of Ireland nell'ambito del National Marine Biodiscovery Progra
Seaweeds of Alaska
No full textSchede descrittive per Prasiola borealis, Prasiola crispa, Prasiola delicata, Prasiola meridionalis e Rosenvingiella polyrhiza:
1) http://www.seaweedsofalaska.com/documents/Prasiola_borealis.pdf
2) http://www.seaweedsofalaska.com/documents/Prasiola_crispa.pdf
3) http://www.seaweedsofalaska.com/documents/Prasiola_delicata.pdf
4) http://www.seaweedsofalaska.com/documents/Prasiola_meridionalis(1).pdf
5) http://www.seaweedsofalaska.com/documents/Rosenvingiella_polyrhiza.pd
Bringing order to little green balls: new insights from the chlorophycean order Sphaeropleales
No full textRecent advances in the systematics of subaerial microalgae responsible of biodeterioration of artificial surfaces
No full textEcological differentiation of cryptic species within an asexual protist morphospecies: a case study of filamentous green alga Klebsormidium (Streptophyta).
No full textTaxa of microbial eukaryotes defined on morphological basis display a large degree of genetic diversity, implying the existence of numerous cryptic species. However, it has been postulated that genetic diversity merely mirrors accumulation of neutral mutations. As a case taxon to study cryptic diversity in protists, we used a widely distributed filamentous genus, Klebsormidium, specifically the lineage E (K. flaccidum/K. nitens complex) containing a number of morphologically similar strains. Fourteen clades were recognized in the phylogenetic analysis based on a concatenated ITS rDNA + rbcL data set of more than 70 strains. The results of inferred character evolution indicated the existence of phylogenetic signal in at least two phenotypic characters (production of hydro-repellent filaments and morphology of zoosporangia). Moreover, the lineages recovered exhibited strong ecological preferences to one of the three habitat types: natural subaerial substrata, artificial subaerial substrata, and aquatic habitats. We interpret these results as evidence of existence of a high number of cryptic species within the single morphospecies. We consider that the permanent existence of genetically and ecologically well-defined cryptic species is enabled by the mechanism of selective sweep
Contribution to the knowledge of the benthic algal flora of the Isle of Alboran, with notes on some little-known species in the Mediterranean
No full textL'anno esatto di pubblicazione è 199
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