نتایج جستجو برای: phytogeography

تعداد نتایج: 128  

2014
Rashmi Srivastava Gaurav Srivastava David L. Dilcher

PREMISE OF RESEARCH A large number of fossil coryphoid palm wood and fruits have been reported from the Deccan Intertrappean beds of India. We document the oldest well-preserved and very rare costapalmate palm leaves and inflorescence like structures from the same horizon. METHODOLOGY A number of specimens were collected from Maastrichtian-Danian sediments of the Deccan Intertrappean beds, Gh...

2013
Orland J. Blanchard Jr.

Kosteletzkya C. Presl, 1835 (Malvaceae, Malvoideae, Hibisceae) includes 17 species, all but two of which are about evenly distributed between Africa and the northern Neotropics. Fifteen of the species were brought into cultivation and used in a hybridization program in an attempt to shed light on evolutionary and phytogeographic relationships in the genus. Chromosome pairing (x = 19) at meiosis...

Journal: :Tropical Zoology 2023

A positive correlation between cave size and bat diversity has been recorded by some authors for different areas in South America. We analyzed published otherwise available data from three Brazilian karst phytogeography domains, including NE SE Atlantic Forest Cerrado (savannah-like vegetation), encompassing a wide range of sizes. found no such correlation, as expected view previous observation...

Journal: رستنیها 2003
B. HASSANZADEH KIABI B. ZEHZAD M. R. KANANI

In this research, vascular plants of Bamu National Park (48000 ha.) situated in Fars province were studied. Analyses of all collected plants (450 species) showed that on account of climatic conditions, 94% of them were flowering in spring, also hemicryptophytes and therophytes possess abundant growth form with 39.6% and 23.5%, respectively. Phytogeographically, Irano-Turanian  elements comprise...

Journal: رستنیها 2012
A. Pourmirzaei A.A. Maassoumi P. Rajaei, T. Nejad Sattari V. Mozaffarian

Iran is a mountainous country. Hezar Mt., is an isolated mountain with the highest peak of 4465 m (above sea level) located in southeast of Iran. This paper aims to provide a general overview of alpine phytodiversity of Hezar Mt. Alpine regions are above timber-line which is dependent on the climate, slopes and human activities. The timberline at Hezar Mt., is varying from 3200 m (North slope) ...

Journal: رستنیها 2017
Ahmadreza Mehrabian, Mohammad Javad Nikjoyan Sadaf Sayadi,

Onosma L. as a rich taxa in Boraginaceae including about 150–180 species, centered mainly in Irano-Turanian region. The genus faced with several systematic complexities lead to many identification problems as well as morphological polymorphism. Several authors have used setae characteristics in Onosma as the most important diagnostic evidence in delimitation and classification of species in add...

Journal: :Frontiers in Marine Science 2022

Despite the increased number of paleoceanographic studies in SW Atlantic recent years, mechanisms controlling marine productivity and terrestrial material delivery to South Brazil Bight remain unresolved. Because its wide continental shelf abrupt change coastline orientation, this region is under influence several environmental forcings, causing have large variability primary production. This s...

2013
Gaurav Srivastava Rakesh C. Mehrotra

A new fossil leaf impression of Alphonsea Hk. f. & T. of the family Annonaceae is described from the Late Oligocene sediments of Makum Coalfield, Assam, India. This is the first authentic record of the fossil of Alphonsea from the Tertiary rocks of South Asia. The Late Oligocene was the time of the last significant globally warm climate and the fossil locality was at 10°-15°N palaeolatitude. Th...

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