This is the first scientific-educational work in English on this
topic. The Caucasus Isthmus between the Black and Caspian Seas
(38025' and 47015'N, 36030' and 50020'E) is a region in the
Northern Hemisphere. It covers an area of approximately 441,000km2.
Being a natural bridge between Europe and Asia, the Caucasus is an
extraordinary crossroads in terms of its geopolitical status,
cultural heritage, and biodiversity. The Caucasus is famous for
having some of the richest biodiversity, making it one of the 34
most diverse and endangered biodiversity hotspots in the world. The
region occurs from among the lush, broad-leaved forests along the
Black Sea coastal area, to the well-expressed nival zone and the
deserts of the eastern Caucasus. Flora within the Caucasus is
diverse, with about 6,300 species of vascular plants, 1,600 of
which are endemic and relict endemics (25.3 %). Biota of the
Caucasus has always aroused the interest of scholars. Studies
conducted by botanists and zoologists on the biodiversity of the
Caucasus started in the beginning of the 18th century. Such
research activities were relatively short-term, and based solely on
either plant or animal investigations. Long-term, comprehensive
(floristic, faunistic, biogeographical) studies of the wilderness
of the Caucasus in all biomes and altitudinal zones, and in all
vegetation seasons, were carried out by Dr G. Radde in the late
19th and early 20th centuries, and Dr A. M. Gegechkori in the
second half of the 20th and early 21st centuries. In the framework
of the Caucasus biota, the main target of research activity of Dr.
Gegechkori (1962-2018) was psyllids (Insecta; Hemiptera:
Psylloidea) - a highly indicative (bio-indicator) group for
environmental research. This text aims to provide information for
naturalists, concerning the biota of the Caucasus, through its
biomes, amd refugial areas and habitats. The work is focused on
supplying a datebase for the current presence and distribution of
many speceis, with an emphasis on the keastone species, the
existance and range of which face major challenges and threats
today, caused primarily by human's direct and indirect activity,
and global warming. The book incorporates the most recent taxonomic
ranking of plants and animals species in the Caucasus, and the
regularity and history of its biomes, among other topics. The
monograph is also heavily illustrated with mostly original color
photos, which reinforce the scientific quality of the text. This
book will be of great interest to scholars of life and earth
sciences and geographers. As an interdisciplinary work, the
monograph provides students of all levels with valuable information
on the environmental sciences, which may isnpire them to pursue
this topic within natural science, stimulating their research and
career choices. Finally, the purpose of the work is to strenghten
the readers' awareness of the environmental challenges among the
local people of the Caucasus, in light of on-going environmental
changes, and the necessity of protection of this region's natural
resources.
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