980 resultados para Caspian Sea Region--Maps--Early works to 1800


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in qua itinera Regia et alia notabiliora accurate denotantur per A. Maas ; reductio mappæ haijus a majore in hanc monirem formam facta est per Iohannem Petrum van Ghelen.

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immenso labore et maximis sumptibus facta, atque ex autographo in lucem edita per Reinerum Ottens geographum Amstelaedam ; Iacob Keyser sculp.

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Abundance and size distribution of ctenophore Mnemiopsis leidyi in different parts of the Caspian Sea were studied in summer 2001 in relation to environmental conditions. In general, principal differences were found in M. leidyi abundance and population reproduction activity in northern-, middle- and southern Caspian waters. Ctenophore was practically absent in the northern Caspian. In the west of the middle Caspian Sea it penetrated far to the north demonstrating low reproduction activity. In the east the first single comb jellies were pointed out only in the most south of the region. In the warmest and most productive southern part of the Caspian Sea several zones of M. leidyi active breeding were found with total abundance exceeding 6000 #/m**2. Breeding activity and abundance of ctenophores increased here from the east to the west exceeding maximum values along the western coast of the southern Caspian Sea in regions of intensive sprat catching. Dependence of M. leidyi population development on temperature conditions was mentioned. On the base of remote sensed surface temperature, chlorophyll, and suspended mater distribution analysis possible ctenophore settling mechanisms by mesoscale dynamic structures were examined. Practical applications of obtained results are discussed for using effective biological methods to prevent catastrophic consequences of M. leidyi invasion to the Caspian Sea.

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Covers Egypt and portions of Libya, Sudan and Israel including the Red Sea and the Nile.

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Relief shown pictorially.

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Depths shown by soundings.

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Scale ca. 1:250,000.