280 research outputs found
Biogeographical Areas of Hispaniola (Dominican Republic, Republic of Haiti)
The island of Hispaniola is located between parallels 17 and 19 N and forms part of the Greater Antilles group in the Caribbean region. It covers an area of 76,484 km2 and has the highest altitudes in the whole Caribbean region. The island consists of two countries: the Dominican Republic and the Republic of Haiti. The flora of both countries has been studied in depth by Liogier and several authors from the Dr. Rafael Ma. Moscoso National Botanical Garden in Santo Domingo; this has enabled us to examine the distribution of 1582 endemic species in 19 areas and several important endemic habitats for conservation: Lepotogono buchii‐Leptochloopsietum virgatae;Crotono astrophori‐Leptochloopsietum virgatae;Melocacto pedenalensi‐Leptochloopsietum virgatae and Solano microphylli‐Leptochloopsietum virgatae pine forests on serpentine belonging to the association Leptogono buchii‐Pinetum occidentalis and high‐mountain pine forests: Dendropemom phycnophylli‐Pinetum occidentalis and Cocotrino scopari‐Pinetum occidentalis. Some dry forest communities are of interest, including Chrysophyllo oliviformi‐Sideroxyletum salicifolii and Zamio debilis‐Metopietum toxiferi. Based on the floristic analysis and the vegetation study, a biogeographical typology for the island, in which we propose 19 biogeographical areas (BA) has been established
The Algarve climatophilous vegetation series – Portugal: a base document to the planning, management and nature conservation Les séries de végètation climatophiles de l’Algarve - Portugal: un document de base pour la planification, gestion et conservation de la nature
This work was developed as part of PhD research devoted to the flora and vegetation of the Caldeirão and
Monchique mountains that aims to identify the vegetation climatophilous series and use them as an environmental
diagnosis of Algarve administrative province phyto-ecological subregions. Biogeographic and bioclimatic considerations
are presented, as well as the study area pedological and lithological characterization. For each of the seven
climatophilous series the dynamic and catenal behaviours, as well as the main characteristic plants that constitute the
successional stages, are given. The corresponding patrimonial value is studied
Soil and Phytosociological Characterisation of Grasslands in the Western Mediterranean
A study was made of grasslands in olive groves with a high frequency of Hordeum leporinum Link,
Chrysanthemum coronarium L., Malva neglecta Wallr., Aegilops geniculata Roth and Dasypyrum
villosum (L.) Borbas, initially included in the alliance Hordeion leporini Br.-Bl. in Br.-Bl., Gajewski,
Wraber & Walas 1936 corr. O. Bolós 1962, and sub-alliance Malvenion neglectae Gutte 1966. The
study was carried out in the western Mediterranean (Spain, Italy, Portugal and northern Morocco).
The soil and phytosociological treatment of the samples contributes information for new plant
communities. In the study of plant communities, the indices of degree of presence are adapted to
those of Van der Maarel. The new alliance Securigero securidacae-Dasypyrion villosi is proposed
for the sub-Mediterranean and Euro-Siberian territories, with the new communities Securigero
securidacae-Dasypyretum villosi and Convolvulo elegantissimi-Aegilopetum geniculatae. This last
community, due to its richness in Aegilops geniculata Roth, could be included in the alliance Taeniathero-
Aegilopion geniculatae Rivas-Martínez & Izco 1977; however, the soil and statistical analyses
reveal that it should remain part of the alliance Securigero securidacae-Dasypyrion villosi.
The soil and floristic study of Hordeion leporini and Malvenion neglectae allows us to describe the
new sub-alliance Resedo albae-Chrysanthemenion coronarii, subordinated to Malvion neglectae
(Gutte 1966) status novo
Diversity and conservation status of mangrove communities in two areas of Mesocaribea biogeographic region
The study of mangrove communities (Avicennia germinans,
Conocarpus erectus, Laguncularia racemosa
and Rhyzophora mangle) in Central America reveals a total diversity of 121 species included in 7 plant communities, of which 15 are characteristic of mangroves and 31 of flooded areas with less pronounced salinity, while 75 are invasive species belonging to neighbouring communities. Frequent fires in the dry forest have
caused intense erosion, leading to the silting of the lake basin. As a result, the first belt of Rhizophora vegetation is extremely rare. In contrast, there is a
predominance of Laguncularia and Conocarpus mangrove plants, in addition to a belt of Phragmito Magnocaricetea with a high incidence of Phragmites australis,
which acts as an indicator of sediment silting due to its shallowness
Analysis of the Cytisetea scopario-striati scrubs in the south-west-centre of the Iberian Peninsula
The statistical and phytosociological study of 255 relevés taken in the south-west of the Iberian Peninsula and
made up of our own samples and previous publications reveals how close these relevés, previously ascribed to different
syntaxa, really are. Our re-arrangement of the data leads us to propose for the territory the 15 associations already published
and three new ones, namely: Genisto floridae-Adenocarpetum argyrophylli ass. nova hoc loco, Cytisetum bourgaei-
eriocarpi nova, Lavandulo viridis-Cytisetum striati ass. nova hoc. loco. We also suggest a name correction,
Adenocarpo anisochili-Cytisetum scoparii J.C. Costa et al. 2000 corr., and a status change, namely, Ulici latebracteati-
Cytisetum striati (Costa et al. 2000) status novo
Current state of the Prunetalia spinosae communities in the centre and south of the Iberian Peninsula (Spain, Portugal)
This paper re-examines the Rhamno-Prunetea class in the centre and south of the Iberian Peninsula, especially
in Andalusia. The paper also deals with the alliances Pruno-Rubion ulmifolii Lonicero-Berberidion hispanicae in the
south of the Iberian Peninsula, and Berberidion vulgaris (Berberidenion seroi) in the area of Cuenca. Our analysis of
225 relevés arranged in 22 phytosociological tables helped us to re-organize the available information and subsequently
propose three associations and two subassociations: Clematido vitalbae-Rosetum micranthae nova; Berberido hispanicae-
Buxetum sempervirentis nova; Roso siculae-Berberidetum hispanicae Mota nova subas. prunetosum ramburii Mota
nova; Lonicero arboreae-Rhamnetum cathartici Martínez-Parras and Molero 1983 subas. prunetosum ranburii nova. As
a result of the study, a total of 18 syntaxa with the rank of association and four with the rank of subassociation are proposed
for the south of the Iberian Peninsula
Distribution patterns of endemic flora to define hotspots on Hispaniola
Nineteen areas on the island of Hispaniola (Haiti and the Dominican Republic) were studied with the aim of determining
the distribution pattern of the endemic flora in these areas, and their variability with altitude. The main concentration of
endemic species occurs in mountains with a medium altitude and in certain mountain sites (palaeo-islands), which coincide
with hotspots; a lower number of endemics are found in low-lying areas (coldspots), due to the degradation of their habitats.
A total of 1,582 endemic species were studied and were distributed in 19 areas. The whole island is of outstanding interest
for its richness in endemics; it has 2,050 endemic species, representing 34.16% of its total flora. The territory in the study is
home to 1,284 genera of which 31 are endemic to the island, including monotypical genera such as Tortuella abietifolia
Urb. & Ekman, and endemic genera such as Hottea, containing seven endemic species. The sites with the highest rate of
endemics are area A16 in the central range with a total of 440 endemic species, of which 278 are exclusive to the territory;
and the Sierra de Bahoruco, la Selle, La Hotte and Tibur on in area A12, where we found 699 plants of which 482 are
endemic and exclusive to the area; and A13 with 173 and 129 respectively. This work highlights the exceptional floristic
diversity in endemic species and genera and analyses their distribution patterns as a tool for conservation in this area of the
world, whose high endemicity rate makes it one of the most significant hotspots in the Caribbean
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