scholarly journals La vegetación escletófila perennifolia del Valle de Tehuacán, Puebla y sus similitudes con la vegetación esclerófila de climas mediterráneos

2017 ◽  
pp. 41
Author(s):  
Noe Flores-Hernández ◽  
Alfonso Valiente-Banuet ◽  
Patricia Dávila ◽  
José Luis Villaseñor
Keyword(s):  
Vegetation Type ◽  
Life Forms ◽  
Close Similarity ◽  
Vegetation Distribution ◽  
Tehuacán Valley ◽  
Historical Factors ◽  
The Mediterranean ◽  
Sclerophyllous Vegetation ◽  
The Tropics ◽  
Structural Aspects

The evergreen sclerophyllous vegetation of the Tehuacán Valley is described and compared with 4 of the 5 zones with Mediterranean-type climates. In the vegetation description structural aspects such as cover, height, frequency and life forms spectrum were considered. This vegetation type called Mexical has a close similarity in life forms spectrum with annuals predominance with the Mediterranean-type vegetation. Therefore, the evergreen sclerophyllous vegetation distribution within the tropics not only is explained in relation with  mediterranean-type climates, and also because by historical factors .

Biomorphological structure of the flora of the ancient settlements of the Lower Dnipro

2020 ◽  
Vol 12 (2) ◽  
pp. 290-297
Author(s):  
P Dayneko
Keyword(s):  
Anthropogenic Impact ◽  
Vegetation Type ◽  
Steppe Zone ◽  
Life Forms ◽  
Perennial Grasses ◽  
Agricultural Fields ◽  
Type Transformation ◽  
Adventitious Species ◽  
Total List ◽  
High Share

The biomorphological analysis of the flora of eighteen ancient settlements of the Lower Dnipro as a potential "islands" of steppe biodiversity has been introducing. Based on the most commonly used linear systems of life forms by K. Ranquier and by V.M Golubev there have been presented the results of the analysis of biomorphs. In addition to the main biomorph, the following characteristics were taken into account: multiplicity of fruiting, main types of vegetation, type of underground shoots, type of aboveground shoots, type of root system. Domination in the general spectrum of life forms of the studied flora of herbaceous plants was determined (455 species or 86.8 % of the total number), among which perennials made up the majority (259 species or 49.4 %). The second and third groups are occupied by annuals (148 species or 28.2 % of the total) and biannuals (48 species or 9.2 % of the total), respectively. According to the multiplicity of fruiting, the participation of polycarpics (328 species; 62.6 %) is significant. However, it should be noted, that the high share of herbaceous monocarpics (196 species; 37.4 %) can be explained by the invasion of adventitious species from neighboring agricultural fields and existing settlements. By type of vegetation, summer-green species represent almost half of the total list of flora (231 species), while that of the group of summer and winter green plants was represented by 168 species or 32 %. By type of aboveground shoots, the predominance is given to semi-rosette species (276 species; 52.7 %), and by type of underground shoots - to caudex (201 species; 38.4 %) and plants without rhizomes (196; 37.4 %). Our study confirmed that biomorphological structure of the flora of ancient settlements are quite typical for the flora of the steppe zone and the flora of the Holarctic in general, as evidenced by the predominance in the respective spectra of perennial grasses, hemicryptophytes, polycarpics, plants with caudex type of underground shoots and rod type. Transformation of the zonal spectrum as a result of anthropogenic impact is manifested in a significant percentage of trees, annuals, monocarpics and species of rhizome structure.

scholarly journals New data on the ecological peculiarities and the distribution in Bulgaria of the vulnerable habitat F3.1d Balkan-Anatolian submontane genistoid scrub from the European Red List of Habitats

Hacquetia ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 271-287
Author(s):  
Georgi Kunev ◽  
Rossen Tzonev
Keyword(s):  
Vegetation Type ◽  
Volcanic Rocks ◽  
Habitat Type ◽  
Life Forms ◽  
Plant Life Forms ◽  
Area Of Occupancy ◽  
Floristic Elements ◽  
First Time ◽  
Floristic Structure ◽  
East Mediterranean Region

Abstract The study presents new data on the habitat dominated by the species complex of Genista lydia/G. rumelica in Bulgaria. It is based on 129 phytocoenological relevés and provides information on the chorology, ecology and floristic structure of these communities. This habitat type occupies substrates composed by different volcanic rocks. The floristic structure is very rich in species. The phytogeographical relationships with the East Mediterranean region are considerable, which is proved by the high occurrence of floristic elements with Mediterranean or sub-Mediterranean origin. The plant life-forms analysis demonstrates that the therophytes, geophytes and chamephytes prevail in their floristic structure, which is also typical for the shrub communities in this region. During the field study this vegetation type has been mapped and its total area of occupancy has been calculated. For a first time it is proposed this habitat to be divided into three habitat sub-types due to the established differences in the environmental factors. Some recommendations have been proposed on the conservation management and also complements on the habitat‘s descriptions in EUNIS habitat classification.

Lifeforms as criterion for species delimitation: Are Aristida adscensionis and A. coerulescens (Aristidoideae, Poaceae) two species?

Phytotaxa ◽  
2019 ◽  
Vol 393 (1) ◽  
pp. 67 ◽  
Author(s):  
MIKE THIV ◽  
J. ALFREDO REYES-BETANCORT ◽  
ORI FRAGMAN-SAPIR
Keyword(s):  
Morphometric Analysis ◽  
Species Delimitation ◽  
Phylogenetic Trees ◽  
Morphological Analysis ◽  
Phylogenetic Analyses ◽  
Life Forms ◽  
Clear Separation ◽  
Taxonomic Treatment ◽  
Molecular Phylogenetic ◽  
The Mediterranean

The distinction of the perennial Aristida coerulescens from the annual A. adscensionis and its taxonomic treatment has been subject of long discussions. We here include accessions from the Mediterranean and Macaronesia for molecular phylogenetic analyses and conducted a morphometric analysis. A lineage of A. adscensionis, A. coerulescens and A. effusa is well supported in phylogenetic trees. Moreover, a group of Mediterranean, Macaronesia and Arabian A. coerulescens and A. adscensionis is revealed where both taxa are intermingled. A morphological analysis of traditionally used spikelet characters did not indicate a clear separation of both taxa. We therefore conclude that A. coerulescens should best be treated as synonym of A. adscensionis. The differential character of annual and perennial life forms seems to be plastic in this taxon indicating rapid shifts between these two strategies. 

scholarly journals Oribatid mites (Acari, Oribatida) of steppe vegetation on cape Tarhankut in Crimea (Ukraine)

2009 ◽  
Vol 46 (2) ◽  
pp. 97-103 ◽  
Author(s):  
Stanisław Seniczak ◽  
Sławomir Kaczmarek ◽  
Anna Seniczak
Keyword(s):  
Central Asia ◽  
Age Structure ◽  
Mediterranean Region ◽  
Mediterranean Climate ◽  
Vegetation Type ◽  
Sea Breeze ◽  
Oribatid Mites ◽  
Steppe Vegetation ◽  
Geographic Expansion ◽  
The Mediterranean

Oribatid mites (Acari, Oribatida) of steppe vegetation on cape Tarhankut in Crimea (Ukraine)Oribatid mites were investigated in patches of steppe vegetation, dominated by esparto (Stipasp.), other grasses,Artemisia caucasica, Sedumsp., mosses, or lichens, on cape Tarhankut in Crimea (Mediterranean climate). These mites were quite abundant and rich in species there, probably thanks to the fresh sea breeze and geographic expansion of species from the Mediterranean region, Central Asia, and Europe. They achieved the highest density in patches of steppe grasses other than esparto, but most species occurred in sedum patches. The most abundant wasTectocepheus velatus, especially in patches of steppe grasses other than esparto, and relatively abundant wereScutovertexsp. 1,Jacotella neonominataandScheloribates laevigatus. In populations of these species the adults usually dominated, but their age structure greatly depended on vegetation type.

scholarly journals Floral Distribution of a Sub-Bituminous Coal Dumpsite in Enugu, Nigeria

2021 ◽  
Vol 9 ◽  
Author(s):  
Imade Y. Nsa ◽  
Oyetola O. Oyebanji ◽  
Eric E. Igbinigie ◽  
Ayodeji A. Odunsi
Keyword(s):  
Vegetation Type ◽  
Floristic Composition ◽  
Diversity Indices ◽  
Life Forms ◽  
Panicum Maximum ◽  
Distribution Analysis ◽  
Ageratum Conyzoides ◽  
Control Zone ◽  
Floral Diversity ◽  
Species Diversity Indices

The remnant floral diversity of a naturally reclaimed area proximal to an abandoned mine was assessed. The coal mine site, the Incident zone (IZ) and an unsullied site, the Control zone (CZ), were sampled. Using a 5 m2 quadrat, the floristic composition was determined by the occurrence, distribution analysis, and species diversity indices. The study revealed a degraded vegetation type and recorded a total of 60 species, 53 genera and 27 families. Both the IZ and CZ shared 26.67% species similarity, while 36.67% are were unique to each zone. Five species were dominant (Ageratum conyzoides, Panicum maximum, Calopogonium mucunoides, Chromolaena odorata). While the dominant genera vary between IZ (Borreria, Dioscorea, Ipomoea, and Phyllanthus) and CZ (Desmodium, Euphorbia, and Ipomoea), Asteraceae and Poaceae were the dominant families in both zones. Forbs were the most dominant life forms in both zones; Cyclosorus sp. and Adiantum sp. were only found on the IZ, whereas, Kyllinga erecta and Mariscus alternifolius were exclusive to the CZ. Our results reflect that species composition and vegetation paradigm in the study area could be influenced by coal mining, farming, infrastructural installations and climate. Hence, we suggest future studies to investigate how the species adapt to the environment. Although most of the species encountered belonged to lower-risk conservation, the conservation of the species to this area is imperative.

scholarly journals Towards a global understanding of vegetation–climate dynamics at multiple time scales

2019 ◽  
Author(s):  
Nora Linscheid ◽  
Lina M. Estupinan-Suarez ◽  
Alexander Brenning ◽  
Nuno Carvalhais ◽  
Felix Cremer ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Time Scales ◽  
Vegetation Type ◽  
Multiple Time Scales ◽  
Multiple Time ◽  
Climate Variables ◽  
Short Term ◽  
Modes Of Variability ◽  
Global Understanding ◽  
The Tropics

Abstract. Climate variables carry signatures of variability at multiple time scales. How these modes of variability are reflected in the state of the terrestrial biosphere is still not quantified, nor discussed at the global scale. Here, we set out to gain a global understanding of the relevance of different modes of variability in vegetation greenness and its co-variability with climate. We used > 30 years of remote sensing records of Normalized Difference Vegetation Index (NDVI) to characterize biosphere variability across time scales from sub-monthly oscillations to decadal trends using discrete Fourier decomposition. Climate data of air temperature (Tair) and precipitation (Prec) were used to characterize atmosphere-biosphere co-variability at each time scale. Our results show that short-term (intra-annual) and longer-term (inter-annual and longer) modes of variability make regionally highly important contributions to NDVI variability: Short-term oscillations focus in the tropics where they shape 27 % of NDVI variability. Longer-term oscillations shape 9 % of NDVI variability, dominantly in semi-arid shrublands. Assessing dominant time scales of vegetation-climate co-variation, a natural surface classification emerges which captures patterns not represented by conventional classifications, especially in the tropics. Finally, we find that correlations between variables can differ and even invert signs across time scales. For southern Africa for example, correlation between NDVI and Tair is positive for the seasonal signal, but negative for short-term and longer-term oscillations, indicating that both short and long-term temperature anomalies can induce stress on vegetation dynamics. Such contrasting correlations between time scales exist for 15 % of vegetated area for NDVI with Tair, and 27 % with Prec, indicating global relevance of scale-specific climate sensitivities. Our analysis provides a detailed picture of vegetation-climate co-variability globally, characterizing ecosystems by their intrinsic modes of temporal variability. We find that (i) correlations of NDVI with climate can differ between scales, (ii) non-dominant sub-signals in climate variables may dominate the biospheric response, and (iii) possible links may exist between short-term and longer-term scales. These heterogeneous ecosystem responses on different time scales may depend on climate zone and vegetation type, and are to date not well understood, nor always correspond to transitions in dominant vegetation types. These scale dependencies can be a benchmark for vegetation model evaluation and for comparing remote sensing products.

Plant Evolution in the Mediterranean

2020 ◽  
Author(s):  
John D. Thompson
Keyword(s):  
Mediterranean Region ◽  
Traditional Approach ◽  
Spatial Scales ◽  
Plant Evolution ◽  
Major Theme ◽  
Mosaic Landscape ◽  
Historical Factors ◽  
Habitat Variation ◽  
History Of ◽  
The Mediterranean

Plant Evolution in the Mediterranean: Insights for conservation brings together a diverse literature on the Mediterranean flora in a detailed but synthetic account of plant evolutionary ecology. The central themes of ecological dynamics and evolutionary differentiation are developed at two spatial scales: habitat variation across the landscape and biogeographic processes across the Mediterranean. The history of the Mediterranean region is at the heart of this account and is described within a triptych that links geological and climatic history to the advent and history of human activities. The Mediterranean region is a hotspot of plant biodiversity, a key ingredient of which is its richness in endemic species. A primary question motivating this book concerns the role of historical factors and spatial environmental variation in the evolution of endemism. The Mediterranean landscape is a mosaic of ecological conditions, often with variation over short distances. A second focus is on the ecological and historical factors that mediate dispersal, reproduction, and adaptive trait variation in this mosaic landscape. With an ever-growing human footprint on the Mediterranean region, this book addresses a third major theme concerning the vulnerability and conservation of the flora. Alongside a traditional approach to rare species and protected area management, the book argues for the integration of the loss of evolutionary potential as a priority in conservation policy and practice. This accessible text is aimed at students and researchers in plant evolution, ecology, biogeography, and conservation science. It will be of interest to scientists and natural history societies worldwide.

Five new sponge species (Porifera: Demospongiae) of subtropical or tropical affinities from the coast of Lebanon (eastern Mediterranean)

2007 ◽  
Vol 87 (6) ◽  
pp. 1539-1552 ◽  
Author(s):  
Jean Vacelet ◽  
Ghazi Bitar ◽  
Sophie Carteron ◽  
Helmut Zibrowius ◽  
Thierry Perez
Keyword(s):  
New Species ◽  
Eastern Mediterranean ◽  
West African ◽  
Sponge Species ◽  
Levantine Basin ◽  
West African Coast ◽  
African Coast ◽  
The Mediterranean ◽  
Lessepsian Migrants ◽  
The Tropics

Five new species of sponges are described from the coast of Lebanon in the eastern Mediterranean, Levantine Basin. Euryspongia raouchensis (Dysideidae), Liosina blastifera (Dictyonellidae) and Niphates toxifera (Niphatidae) belong to genera that are new for the Mediterranean but widely distributed in the tropics. Cinachyrella levantinensis (Tetillidae) and Ciocalypta carballoi (Halichondriidae) are described in genera with a restricted distribution in the Mediterranean, which have affinities with species from the Atlantic West African coast. These species do not appear to be lessepsian migrants, but are interpreted as remnants of an ancient thermophilous fauna that survived in the easternmost part of the Mediterranean.

scholarly journals Wet Meadow Plant Communities of the Alliance Trifolion pallidi on the Southeastern Margin of the Pannonian Plain

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 381
Author(s):  
Andraž Čarni ◽  
Mirjana Ćuk ◽  
Igor Zelnik ◽  
Jozo Franjić ◽  
Ružica Igić ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Plant Communities ◽  
Mediterranean Climate ◽  
Management Practices ◽  
Vegetation Type ◽  
Habitat Type ◽  
Wet Meadow ◽  
Northern Border ◽  
Pannonian Plain ◽  
The Mediterranean

The article deals with wet meadow plant communities of the alliance Trifolion pallidi that appear on the periodically inundated or waterlogged sites on the riverside terraces or gentle slopes along watercourses. These plant communities are often endangered by inappropriate hydrological interventions or management practices. All available vegetation plots representing this vegetation type were collected, organized in a database, and numerically elaborated. This vegetation type appears in the southeastern part of the Pannonian Plain, which is still under the influence of the Mediterranean climate; its southern border is formed by southern outcrops of the Pannonian Plain and its northern border coincides with the influence of the Mediterranean climate (line Slavonsko Gorje-Fruška Gora-Vršačke Planine). Numerical analysis established four plant associations—Trifolio pallidi–Alopecuretum pratensis, Ventenato dubii–Trifolietum pallidi, Ranunculo strigulosi–Alopecuretum pratensis, and Ornithogalo pyramidale–Trifolietum pallidi. Each association was elaborated in detail: diagnostic plant species, nomenclature, geographical distribution, climatic and ecological conditions, and possible division into subassociations. Results are presented in a distribution map, figures resulting from numerical analysis, and a synoptic table. The hydrological gradient was found as the most important factor shaping the studied plant communities. The article also brings new field data on this vegetation type, which has not been sampled for decades and is in process of evaluation to be included as a special habitat type in the Habitat Directive.

Sign in / Sign up

Export Citation Format

Share Document