Highlights• Climate effects and human influence on forest fire activity in Latvia was assessed using time-series analysis.• Drought conditions during summer season had the strongest effect on fire activity of tested climatic variables.• Negative trends and spatial distribution pattern of fire activity suggests of prevailing human influence on forest fire regime over the 20th century. AbstractFire as disturbance of forests has an important ecological and economical role in boreal and hemiboreal forests. The occurrence of forest fires is both climatically and anthropogenically determined and shifts in fire regimes are expected due to climate change. Although fire histories have been well documented in boreal regions, there is still insufficient information about fire occurrence in the Baltic States. In this study, spatio-temporal patterns and climatic drivers of forest fires were assessed by means of spatial and time-series analysis. The efficiency of Canadian Fire Weather (FWI) indices as indicators for fire activity was tested. The study was based on data from the literature, archives, and the Latvian State Forest service database. During the period 1922-2014, the occurrence and area affected by forest fires has decreased although the total area of forest land has nearly doubled, suggesting improvement of the fire suppression system as well as changes in socioeconomic situation. The geographical distribution of forest fires revealed two pronounced clusters near the largest cities of Riga and Daugavpils, suggesting dominance of human causes of ignitions. The occurrence of fires was mainly influenced by drought. FWI appeared to be efficient in predicting the fire occurrence: 23-34% of fires occurred on days with a high or extremely high fire danger class, which overall had a relative occurrence of only 4.3-4.6%. During the 20th century, the peak of fire activity shifted from May to April, probably due to global warming and socioeconomic reasons. The results of this study are relevant for forest hazard mitigation and development of fire activity prediction system in Latvia.

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The Akkadians' nomadic origins have generally been assumed. However, the conventional prehistoric archaeological picture fails to illuminate those origins and the Akkadians' involvement in Akkad. Thus the origins of pastoral nomadism must be sought in the context of mixed farming within the Fertile Crescent, specifically during the PPNB. Subsequent expansion into marginal agricultural lands led to a symbiotic relationship between pastoral nomads and farmers. The Akkadians seem to have moved into the northern Arabian steppe and desert (Jezireh and Hamada) during the mid-seventh millennium B.c.; the PPNB/ C populations apparently began intensive herding at the end of that period, and maintained ties to the Fertile Crescent seen in both exotic trade and everyday culture. They began to penetrate into Akkad during the time under discussion. Archaeological sequences in the Arabian desert suggest that the Akkadians probably were of a West Semitic (Levantine) background. Thus, the alluvium in the Akkadian area became a distinct entity as early as ca. 6000 B. C. and represented the early prehistoric forerunners to Akkadians of thefourth and third millennia B.c.

No abstract

It has been forty years since the first edition of this book, as an Oriental Institute doctoral dissertation, was completed. Now, in a fully revised and much expanded study, CUSAS 24 presents a comprehensive discussion of the philological, historical, and archaeological evidence for the range of equidae known now from much of Western

A small Neolithic lithic scatter site was discovered in 1992 through survey in the southern region of Dhofar, Oman just south of the Rub al Khali. Four test units (1994, 2009) confirmed a 60-90 cm single period Neolithic stratification sequence of the mid-sixth millennium BC. Lithic debris contains all stages of knapping from prepared cores and is dominated by trihedral rod production. Based on comparable sites both to the west in Yemen and to the east in northern Oman/the UAE, it is suggested that still rare domesticated cattle and ovicaprids supplemented a basic forager lifestyle. Participation in long-range trade networks involved marine shells, exotic flint tools as well as obsidian, steatite and amazonite. Genetic testing suggests that the Neolithic populations may represent ancestral Modern South Arabic Language (MSAL) populations currently living in southern Arabia.