scholarly journals Habitat variation and vulnerability of Quercus brantii woodlands in the Zagros Mountains, Iran

2021 ◽  
Keyword(s):  
Zagros Mountains ◽  
Habitat Variation ◽  
Quercus Brantii

scholarly journals A Consumer Grade UAV-Based Framework to Estimate Structural Attributes of Coppice and High Oak Forest Stands in Semi-Arid Regions

2021 ◽  
Vol 13 (21) ◽  
pp. 4367
Author(s):  
Seyed Arvin Fakhri ◽  
Hooman Latifi
Keyword(s):  
Arid Regions ◽  
Tree Height ◽  
Growth Forms ◽  
Zagros Mountains ◽  
Zagros Forests ◽  
Forest Models ◽  
Random Forest Models ◽  
Quercus Brantii ◽  
Linear Regressions ◽  
Semi Arid

Semi-arid tree covers, in both high and coppice growth forms, play an essential role in protecting water and soil resources and provides multiple ecosystem services across fragile ecosystems. Thus, they require continuous inventories. Quantification of forest structure in these tree covers provides important measures for their management and biodiversity conservation. We present a framework, based on consumer-grade UAV photogrammetry, to separately estimate primary variables of tree height (H) and crown area (A) across diverse coppice and high stands dominated by Quercus brantii Lindl. along the latitudinal gradient of Zagros mountains of western Iran. Then, multivariate linear regressions were parametrized with H and A to estimate the diameter at breast height (DBH) of high trees because of its importance to accelerate the existing practical DBH inventories across Zagros Forests. The estimated variables were finally applied to a model tree aboveground biomass (AGB) for both vegetative growth forms by local allometric equations and Random Forest models. In each step, the estimated variables were evaluated against the field reference values, indicating practically high accuracies reaching root mean square error (RMSE) of 0.68 m and 4.74 cm for H and DBH, as well as relative RMSE < 10% for AGB estimates. The results generally suggest an effective framework for single tree-based attribute estimation over mountainous, semi-arid coppice, and high stands.

scholarly journals Variations in Wood Density, Annual Ring Width and Vessel Properties of Quercus brantii Affected by Crown Dieback

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 642
Author(s):  
Forough Soheili ◽  
Stephen Woodward ◽  
Isaac Almasi ◽  
Hazandy Abdul-Hamid ◽  
Hamid R. Naji
Keyword(s):  
Wood Density ◽  
Ring Width ◽  
Vessel Diameter ◽  
Zagros Mountains ◽  
Annual Ring Width ◽  
Anatomical Features ◽  
Vessel Morphology ◽  
Effects Of Drought ◽  
Quercus Brantii ◽  
Crown Dieback

Tree decline due to climate change results in physiological weaknesses, attacks by harmful pests and pathogens and threats to forest ecosystem stability. In the work described here, the effects of drought on wood density, tree ring width and variations in vessel morphology are investigated in Persian oak (Quercus brantii) in the forest of the Zagros Mountains, Ilam Province, western Iran. Discs are cut from trunks of declined and healthy trees and woodblocks are cut radially from the sapwood near the bark, at a mid-point between the vascular cambium and the pith (middle) and from wood near the pith. Observations are made on transverse sections from the blocks using microscopy. In trees with decline symptoms, wood density is greater than in healthy trees. Furthermore, declining trees have the narrowest ring width, reduced vessel diameter and area and the highest numbers of vessels and tylose in pith towards the bark. It is concluded that changes in anatomical features are associated with the weakening of trees and are components of declining tree health.

Molecular phylogeny and taxonomic evaluation of the genus Asaccus Dixon and Anderson, 1973 (Reptilia: Phyllodactylidae) in Iran

2020 ◽  
pp. 207-214
Author(s):  
Akbar Fattahi
Keyword(s):  
Molecular Phylogeny ◽  
Nuclear Gene ◽  
Genetic Distances ◽  
Genetic Lineage ◽  
New Taxon ◽  
Zagros Mountains ◽  
Relict Species ◽  
Taxonomical Revision ◽  
Two Populations ◽  
Taxonomic Evaluation

The Iranian species of the phyllodactylid geckos of the genus Asaccus are found only in the valleys of the Zagros Mountains, a region which represents an important area of endemism in western Iran. Recently, many relict species have been described from the central and southern parts of the Zagros Mountains, which were previously known as A. elisae. The recent descriptions of species within this complex suggest that diversity within the genus may be higher than expected and that its taxonomy and systematics should be revised. In the present study, phylogenetic relationships within the genus Asaccus were evaluated using two mitochondrial and one nuclear gene. Genetically, the genus shows high levels of variability. The molecular phylogeny of the genus suggests the presence of three main clades along the Zagros Mountains with the southern population (from the Hormozgan province) and one clade (A. sp8 and A. sp9) being sister taxon to A. montanus from UAE. The remaining samples are separated into two reciprocally monophyletic groups: the northern (Kurdistan, Kermanshah and Ilam provinces) and the central (Lorestan, Khuzestan, Kohgilouye-Bouyer Ahmad and Fars provinces) Zagros groups. The results of the present study suggest that populations attributed to A. elisae in Iran correspond to distinct lineages with high genetic distances. In brief, our results suggest that the genus needs a major taxonomical revision The Arabian origin of the genus has not been confirmed, because two populations from Zagros were located within the A. montanus, A. gallagheri and A. platyrhynchus clade. Further morphological analyses are needed to systematically define each genetic lineage as a new taxon.

Selection and Population Regulation with Habitat Variation

1985 ◽  
Vol 126 (3) ◽  
pp. 418-429 ◽  
Author(s):  
Freddy Bugge Christiansen
Keyword(s):  
Population Regulation ◽  
Habitat Variation

From outcrop to 3D modelling: a case study of a dolomitized carbonate reservoir, Zagros Mountains, Iran

2011 ◽  
Vol 17 (3) ◽  
pp. 283-307 ◽  
Author(s):  
Fabio Lapponi ◽  
Giulio Casini ◽  
Ian Sharp ◽  
Wolfgang Blendinger ◽  
Naiara Fernández ◽  
...  
Keyword(s):  
3D Modelling ◽  
Carbonate Reservoir ◽  
Zagros Mountains

Early upper palaeolithic occupation at Gelimgoush cave, Kermanshah; West-Central Zagros mountains of Iran

2021 ◽  
Vol 38 ◽  
pp. 103050
Author(s):  
Saman Heydari-Guran ◽  
Katerina Douka ◽  
Thomas Higham ◽  
Susanne C. Münzel ◽  
Katleen Deckers ◽  
...  
Keyword(s):  
Upper Palaeolithic ◽  
Zagros Mountains ◽  
West Central ◽  
Early Upper

scholarly journals Identifying priority core habitats and corridors for effective conservation of brown bears in Iran

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
A. Mohammadi ◽  
K. Almasieh ◽  
D. Nayeri ◽  
F. Ataei ◽  
A. Khani ◽  
...  
Keyword(s):  
Protected Areas ◽  
Brown Bear ◽  
Population Connectivity ◽  
Habitat Associations ◽  
Area Network ◽  
Zagros Mountains ◽  
Range Limit ◽  
Brown Bears ◽  
Core Areas ◽  
Effective Conservation

AbstractIran lies at the southernmost range limit of brown bears globally. Therefore, understanding the habitat associations and patterns of population connectivity for brown bears in Iran is relevant for the species’ conservation. We applied species distribution modeling to predict habitat suitability and connectivity modeling to identify population core areas and corridors. Our results showed that forest density, topographical roughness, NDVI and human footprint were the most influential variables in predicting brown bear distribution. The most crucial core areas and corridor networks for brown bear are concentrated in the Alborz and Zagros Mountains. These two core areas were predicted to be fragmented into a total of fifteen isolated patches if dispersal of brown bear across the landscape is limited to 50,000 cost units, and aggregates into two isolated habitat patches if the species is capable of dispersing 400,000 cost units. We found low overlap between corridors, and core habitats with protected areas, suggesting that the existing protected area network may not be adequate for the conservation of brown bear in Iran. Our results suggest that effective conservation of brown bears in Iran requires protection of both core habitats and the corridors between them, especially outside Iran’s network of protected areas.

Spatial pattern analysis in Persian oak (Quercus brantii var. persica) forests on B&W aerial photographs

2008 ◽  
Vol 150 (1-4) ◽  
pp. 251-259 ◽  
Author(s):  
Yousef Erfanifard ◽  
Jahangir Feghhi ◽  
Mahmoud Zobeiri ◽  
Manouchehr Namiranian
Keyword(s):  
Spatial Pattern ◽  
Pattern Analysis ◽  
Aerial Photographs ◽  
Spatial Pattern Analysis ◽  
Quercus Brantii
Sign in / Sign up

Export Citation Format

Share Document