Fertile Crescent

Biodiversity and climate

As crucial as rivers and marshlands were to the rise of civilization in the Fertile Crescent, they were not the only factor. The area is geographically important as the "bridge" between North Africa and Eurasia, which has allowed it to retain a greater amount of biodiversity than either Europe or North Africa, where climate changes during the Ice Age led to repeated extinction events when ecosystems became squeezed against the waters of the Mediterranean Sea. The Saharan pump theory posits that this Middle Eastern land bridge was extremely important to the modern distribution of Old World flora and fauna, including the spread of humanity.

The area has borne the brunt of the tectonic divergence between the African and Arabian plates and the converging Arabian and Eurasian plates, which has made the region a very diverse zone of high snow-covered mountains.

The Fertile Crescent had many diverse climates, and major climatic changes encouraged the evolution of many "r" type annual plants, which produce more edible seeds than "K" type perennial plants. The region's dramatic variety in elevation gave rise to many species of edible plants for early experiments in cultivation. Most importantly, the Fertile Crescent was home to the eight Neolithic founder crops important in early agriculture (i.e., wild progenitors to emmer wheat, einkorn, barley, flax, chick pea, pea, lentil, bitter vetch), and four of the five most important species of domesticated animals—cows, goats, sheep, and pigs; the fifth species, the horse, lived nearby. The Fertile Crescent flora comprises a high percentage of plants that can self-pollinate, but may also be cross-pollinated. These plants, called "selfers", were one of the geographical advantages of the area because they did not depend on other plants for reproduction.

History

As well as possessing many sites with the skeletal and cultural remains of both pre-modern and early modern humans (e.g., at Tabun and Es Skhul caves), later Pleistocene hunter-gatherers, and Epipalaeolithic semi-sedentary hunter-gatherers (the Natufians); the Fertile Crescent is most famous for its sites related to the origins of agriculture. The western zone around the Jordan and upper Euphrates rivers gave rise to the first known Neolithic farming settlements (referred to as Pre-Pottery Neolithic A (PPNA)), which date to around 9,000 BCE and includes very ancient sites such as Göbekli Tepe, Chogha Golan, and Jericho (Tell es-Sultan).

This region, alongside Mesopotamia (Greek for "between rivers", between the rivers Tigris and Euphrates, lies in the east of the Fertile Crescent), also saw the emergence of early complex societies during the succeeding Bronze Age. There is also early evidence from the region for writing and the formation of hierarchical state level societies. This has earned the region the nickname "The cradle of civilization".

From ancient times empires arose and fell in the Tigris–Euphrates river basin, including Sumer, Akkad, Assyria, and Babylonia, .

It is in this region where the first libraries appeared about 4,500 years ago. The oldest known libraries are found in Nippur (in Sumer) and Ebla (in Syria), both from c. 2500 BCE.

Both the Tigris and Euphrates start in the Taurus Mountains of what is modern-day Turkey. Farmers in southern Mesopotamia had to protect their fields from flooding each year. Northern Mesopotamia had sufficient rain to make some farming possible. To protect against flooding they made levees.

Since the Bronze Age, the region's natural fertility has been greatly extended by irrigation works, upon which much of its agricultural production continues to depend. The last two millennia have seen repeated cycles of decline and recovery as past works have fallen into disrepair through the replacement of states, to be replaced under their successors. Another ongoing problem has been salination—gradual concentration of salt and other minerals in soils with a long history of irrigation.

Early domestications

Prehistoric seedless figs were discovered at Gilgal I in the Jordan Valley, suggesting that fig trees were being planted some 11,400 years ago. Cereals were already grown in Syria as long as 9,000 years ago. Small cats (Felis silvestris) also were domesticated in this region. Also, legumes including peas, lentils and chickpea were domesticated in this region.

Domesticated animals include the cattle, sheep, goat, domestic pig, cat, and domestic goose.

Cosmopolitan diffusion

Modern analyses comparing 24 craniofacial measurements reveal a relatively diverse population within the pre-Neolithic, Neolithic and Bronze Age Fertile Crescent, supporting the view that several populations occupied this region during these time periods. Similar arguments do not hold true for the Basques and Canary Islanders of the same time period, as the studies demonstrate those ancient peoples to be "clearly associated with modern Europeans". Additionally, no evidence from the studies demonstrates Cro-Magnon influence, contrary to former suggestions.

The studies further suggest a diffusion of this diverse population away from the Fertile Crescent, with the early migrants moving away from the Near East—westward into Europe and North Africa, northward to Crimea, and northeastward to Mongolia. They took their agricultural practices with them and interbred with the hunter-gatherers whom they subsequently came in contact with while perpetuating their farming practices. This supports prior genetic and archaeological studies which have all arrived at the same conclusion.

Consequently, contemporary in situ peoples absorbed the agricultural way of life of those early migrants who ventured out of the Fertile Crescent. This is contrary to the suggestion that the spread of agriculture disseminated out of the Fertile Crescent by way of sharing of knowledge. Instead, the view now supported by a preponderance of evidence is that it occurred by actual migration out of the region, coupled with subsequent interbreeding with indigenous local populations whom the migrants came in contact with.

A 2005 craniometric study found that not all present-day Europeans share strong affinities to the Neolithic and Bronze Age inhabitants of the Fertile Crescent; the closest ties to the Fertile Crescent rest with Southern Europeans. The same study further demonstrates all present-day Europeans to be closely related. Genetics research finds that most present-day Europeans, across Europe, derive from at least three ancient populations, including the Early European Farmers, who descended from the Near Eastern migrants that brought agriculture to Europe. This ancient farmer population was genetically distinct from European hunter-gatherers and close to present-day Near Easterners.

Languages

Linguistically, the Fertile Crescent was a region of great diversity. Historically, Semitic languages generally prevailed in the modern regions of Iraq, Syria, Jordan, Lebanon, Israel, Palestine, Sinai and the fringes of southeast Turkey and northwest Iran, as well as the Sumerian (a language isolate) in Iraq, whilst in the mountainous areas to the east and north a number of generally unrelated language isolates were found, including; Elamite, Gutian and Kassite in Iran, and Hattic, Kaskian and Hurro-Urartian in Turkey. The precise affiliation of these, and their date of arrival, remain topics of scholarly discussion. However, given lack of textual evidence for the earliest era of prehistory, this debate is unlikely to be resolved in the near future.

The evidence that does exist suggests that, by the third millennium BCE and into the second, several language groups already existed in the region. These included:

• Proto-Euphratean language: a hypothetical non-Semitic language previously hypothesized to be the substratum language of the people that introduced farming into Southern Iraq in the Early Ubaid period. (5300–4700 BCE) The linguistic consensus today is that multiple unknown substrata contributed to the formation of the artifacts in Sumerian names that motivated the Proto-Euphratean substrate hypothesis, including fossilized archaic elements from earlier stages of Sumerian itself.
• Sumerian: a non-Semitic language isolate that displays a Sprachbund-type relationship with neighbouring Semitic Akkadian
• Elamite language: a non-Semitic language isolate
• Semitic languages: Akkadian (aka Assyrian and Babylonian), Eblaite, Amorite, Aramaic, Ugaritic, Canaanite languages (including Hebrew, Moabite, Edomite, Phoenician/Carthaginian)
• Hattic: a language isolate, spoken originally in central Anatolia
• Indo-European languages: generally believed to be later intrusive languages arriving after 2000 BCE, such as Hittite, Luwian and the Indo-Aryan material attested in the Mitanni civilization, but recent evidence suggests that the language family emerged from the Fertile Crescent as early as 6000 BCE
• Egyptian: a stand-alone branch of the Afroasiatic languages confined to Egypt
• Hurro-Urartian languages, a small family. The Kassite language spoken in the northern part of the region may have belonged to this family.

Links between Hurro-Urartian and Hattic and the indigenous languages of the Caucasus have frequently been suggested, but are not generally accepted.