Lazaroa

"In Memoriam" Pedro Montserrat Recoder

2018-01-08T11:20:00+00:00

The name "Salicornietum perennis" ("sensu lato") and global nomenclatural issues

2018-02-06T09:19:50+00:00

The name Zygophyllo fontanesii-Sarcocornietum perennis is rejected as it is invalid and the new name Halimiono portulacoidis-Salicornietum perennis is proposed with two subassociations: typicum and limonietosum canariensis. The name Salicornietum perennis for Cuban communities is corrected to Salicornietum ambiguae.

Phytosociological framework and conservation value of supratemperate riparian birch forest of the NW Iberian Peninsula.

2018-02-06T09:01:27+00:00

We studied the downy birch forests that grow in the headwaters of rivers in the mountains in NW Iberian Peninsula and their differences from other previously described birch forests. To do this, an ordination analysis was done on a data base of 342 relevés (144 unpublished). As a result, four riparian forest associations were recognized in the territory, all of them belonging to the suballiance Saxifrago spathularis-Fraxinenion excelsioris (all. Hyperico androsaemi-Alnion glutinosae, ord. Alno-Fraxinetalia excelsioris, cl. Salici-Populetea). Two associations (Carici reuterianae-Betuletum celtibericae and Violo palustris-Betuletum pubescentis) have been previously described, but the other two (Chaerophyllo hirsuti-Betuletum pubescentis and Valeriano officinalis-Betuletum pubescentis) are described here for the first time. We characterized their floristic composition, ecological features and distribution, and evaluated their conservation value under the criteria of the 92/43/CEE Community Directive, and with regard to national and regional lists of protected species.

Syntaxonomic synopsis of the forest and tall scrub vegetation of Northern Algeria

2018-02-06T09:12:06+00:00

This paper presents the first syntaxonomic conspectus of the forest and scrub communities of Northern Algeria. The communities belong mainly to the zonal classes such as the Quercetea ilicis, Quercetea pubescentis and Junipero-Pinetea sylvestris (new to Algeria). The azonal vegetation is represented by four classes: Alno glutinosae-Populetea albae, Salicetea purpureae, Alnetea glutinosaeFranguletea (the latter being recognized in Algeria for the first time). We attempted to include all known syntaxa as featured in both regular and grey literature; many of those still await effective publication or formal validation. The paper also presents formal descriptions (and/or validations) of one new order, 12 new alliances, and 15 new associations.

Nomenclatural revision and syntaxonomical proposal for wetland peat vegetation in the Valdivian-Magellanian region

2018-02-06T09:15:54+00:00

Abstract. Although numerous descriptive studies have been published throughout the 20th century on peat communities in the Southern Cone of South America, the nomenclature applied to the different units recognised often fails to take into account the proposals of previous authors. Our aim is to clarify the nomenclature by applying the rules of the ICPN to propose a current syntaxonomy of the class Myrteolo nummulariae-Sphagnetea magellanici. After a bibliographic compilation of possible peatland associations from the part of South America between parallels 40º and 56º south, under Temperate and Boreal macroclimates, we have collected around 30 names of phytosociological associations and alliances containing an abundance of homonyms and nomina nuda. Following ICPN standards, we have eliminated duplications and established priority names over others, lectotypified some names and rejected others as nomen ambiguum. We have arranged the floristic groups in the recognised associations in synthetic tables, with some nomina nuda whose characterisation we interpret as doubtful, as a proposed syntaxonomical organisation of the phytosociological class.

The various communities recognised by the different authors who have worked in the territory can be divided into four physiognomic groups: A) cushion bogs, B) Sphagnum bogs C) “montane tundra” bogs and D) sedge-grass bogs. The syntaxonomic grouping we propose for the 13 associations recognised as nomenclaturally valid can be summarised as follows: a single class, Myrteolo nummulariae-Sphagnetea magellanici, is accepted, with a single order, Myrteolo-Sphagnetalia, and three alliances: Astelio pumilae-Oreobolion obtusanguli with seven associations (coinciding with type A), Gaultherio-Sphagnion magellanici with four associations (type B), and Abrotanello linearifoliae-Bolacion caespitosae with two associations (type C). We contest the validity of around 22 names of syntaxa of different ranks, while acknowledging that more studies are required, particularly to define and delimit type D peatland communities.

Mediterranean landscapes and plant communities relationship

2018-02-06T09:18:21+00:00

From a previous landscape classification of Huelva by the Twinspan multivariate classification method, which resulted in eight landscape types, it has been proposed the hypothesis that there is a landscape types-plant communities association. The study was performed on samples of serial scrub communities, by means of a stratified sampling between landscape types. These samples were classified using both phytosociological and Twinspan methods. Through an independent process of synthesis of landscape types and community types (according to Twinspan classification), the possible association between landscapes and communities has been analysed. This analysis has been carried out by two-way contingency table between five landscape units and five plant communities. The null hypothesis that both descriptors were independent has been rejected. On the basis of the appropriate global correspondence between phytosociologic and multivariate plant community classifications, a study of the plant community variation, in accordance with the ecological characterization of the identified syntaxa, has been developed. From it has been concluded the more important role of parent material than climate variables to explain this variation. This conclusion is in agreement with the assigned role to each of them in the biogeographic scope, according to the scale of the study.

Index of nomenclatural syntaxonomic novelties

2018-01-08T11:20:00+00:00