How could those Austronesian-speaking farmers from South China via Taiwan replace the original hunter-gatherer population of the Philippines and western Indonesia so completely that little genetic and no linguistic evidence of that original population survived? The reasons resemble the reasons why Europeans replaced or exterminated Native Australians within the last two centuries, and why South Chinese replaced the original tropical Southeast Asians earlier: the farmers’ much denser populations, superior tools and weapons, more developed watercraft and maritime skills, and epidemic diseases to which the farmers but not the hunter-gatherers had some resistance. On the Asian mainland Austronesian-speaking farmers were able similarly to replace some of the former hunter-gatherers of the Malay Peninsula, because Austronesians colonized the peninsula from the south and east (from the Indonesian islands of Sumatra and Borneo) around the same time that Austroasiatic-speaking farmers were colonizing the peninsula from the north (from Thailand). Other Austronesians managed to establish themselves in parts of southern Vietnam and Cambodia to become the ancestors of the modern Chamic minority of those countries.
However, Austronesian farmers could spread no farther into the Southeast Asian mainland, because Austroasiatic and Tai-Kadai farmers had already replaced the former hunter-gatherers there, and because Austronesian farmers had no advantage over Austroasiatic and Tai-Kadai farmers. Although we infer that Austronesian speakers originated from coastal South China, Austronesian languages today are not spoken anywhere in mainland China, possibly because they were among the hundreds of former Chinese languages eliminated by the southward expansion of Sino-Tibetan speakers. But the language families closest to Austronesian are thought to be Tai-Kadai, Austroasiatic, and Miao-Yao. Thus, while Austronesian languages in China may not have survived the onslaught of Chinese dynasties, some of their sister and cousin languages did.
WE HAVE NOW followed the initial stages of the Austronesian expansion for 2,500 miles from the South China coast, through Taiwan and the Philippines, to western and central Indonesia. In the course of that expansion, Austronesians came to occupy all habitable areas of those islands, from the seacoast to the interior, and from the lowlands to the mountains. By 1500 B.C. their familiar archaeological hallmarks, including pig bones and plain red-slipped pottery, show that they had reached the eastern Indonesian island of Halmahera, less than 200 miles from the western end of the big mountainous island of New Guinea. Did they proceed to overrun that island, just as they had already overrun the big mountainous islands of Celebes, Borneo, Java, and Sumatra?
They did not, as a glance at the faces of most modern New Guineans makes obvious, and as detailed studies of New Guinean genes confirm. My friend Wiwor and all other New Guinea highlanders differ obviously from Indonesians, Filipinos, and South Chinese in their dark skins, tightly coiled hair, and face shapes. Most lowlanders from New Guinea’s interior and south coast resemble the highlanders except that they tend to be taller. Geneticists have failed to find characteristic Austronesian gene markers in blood samples from New Guinea highlanders.
But peoples of New Guinea’s north and east coasts, and of the Bismarck and Solomon Archipelagoes north and east of New Guinea, present a more complex picture. In appearance, they are variably intermediate between highlanders like Wiwor and Indonesians like Achmad, though on the average considerably closer to Wiwor. For instance, my friend Sauakari from the north coast has wavy hair intermediate between Achmad’s straight hair and Wiwor’s coiled hair, and skin somewhat paler than Wiwor’s, though considerably darker than Achmad’s. Genetically, the Bismarck and Solomon islanders and north coastal New Guineans are about 15 percent Austronesian and 85 percent like New Guinea highlanders. Hence Austronesians evidently reached the New Guinea region but failed completely to penetrate the island’s interior and were genetically diluted by New Guinea’s previous residents on the north coast and islands.
Modern languages tell essentially the same story but add detail. In Chapter 15 I explained that most New Guinea languages, termed Papuan languages, are unrelated to any language families elsewhere in the world. Without exception, every language spoken in the New Guinea mountains, the whole of southwestern and south-central lowland New Guinea, including the coast, and the interior of northern New Guinea is a Papuan language. But Austronesian languages are spoken in a narrow strip immediately on the north and southeast coasts. Most languages of the Bismarck and Solomon islands are Austronesian: Papuan languages are spoken only in isolated pockets on a few islands.
Austronesian languages spoken in the Bismarcks and Solomons and north coastal New Guinea are related, as a separate sub-sub-subfamily termed Oceanic, to the sub-sub-subfamily of languages spoken on Halmahera and the west end of New Guinea. That linguistic relationship confirms, as one would expect from a map, that Austronesian speakers of the New Guinea region arrived by way of Halmahera. Details of Austronesian and Papuan languages and their distributions in North New Guinea testify to long contact between the Austronesian invaders and the Papuan-speaking residents. Both the Austronesian and the Papuan languages of the region show massive influences of each other’s vocabularies and grammars, making it difficult to decide whether certain languages are basically Austronesian languages influenced by Papuan ones or the reverse. As one travels from village to village along the north coast or its fringing islands, one passes from a village with an Austronesian language to a village with a Papuan language and then to another Austronesian-speaking village, without any genetic discontinuity at the linguistic boundaries.
All this suggests that descendants of Austronesian invaders and of original New Guineans have been trading, intermarrying, and acquiring each other’s genes and languages for several thousand years on the North New Guinea coast and its islands. That long contact transferred Austronesian languages more effectively than Austronesian genes, with the result that most Bismarck and Solomon islanders now speak Austronesian languages, even though their appearance and most of their genes are still Papuan. But neither the genes nor the languages of the Austronesians penetrated New Guinea’s interior. The outcome of their invasion of New Guinea was thus very different from the outcome of their invasion of Borneo, Celebes, and other big Indonesian islands, where their steamroller eliminated almost all traces of the previous inhabitants’ genes and languages. To understand what happened in New Guinea, let us now turn to the evidence from archaeology.
AROUND 1600 B.C., almost simultaneously with their appearance on Halmahera, the familiar archaeological hallmarks of the Austronesian expansion—pigs, chickens, dogs, red-slipped pottery, and adzes of ground stone and of giant clamshells—appear in the New Guinea region. But two features distinguish the Austronesians’ arrival there from their earlier arrival in the Philippines and Indonesia.
The first feature consists of pottery designs, which are aesthetic features of no economic significance but which do let archaeologists immediately recognize an early Austronesian site. Whereas most early Austronesian pottery in the Philippines and Indonesia was undecorated, pottery in the New Guinea region was finely decorated with geometric designs arranged in horizontal bands. In other respects the pottery preserved the red slip and the vessel forms characteristic of earlier Austronesian pottery in Indonesia. Evidently, Austronesian settlers in the New Guinea region got the idea of “tattooing” their pots, perhaps inspired by geometric designs that they had already been using on their bark cloth and body tattoos. This style is termed Lapita pottery, after an archaeological site named Lapita, where it was described.
The much more significant distinguishing feature of early Austronesian sites in the New Guinea region is their distribution. In contrast to those in the Philippines and Indonesia, where even the earliest known Austronesian sites are on big islands like Luzon and Borneo and Celebes, sites with Lapita pottery in the New Guinea region are virtually confined to small islets fringing remote larger islands. To date, Lapita pottery has been found at only one site (Aitape) on the north coast of New Guinea itself, and
at a couple of sites in the Solomons. Most Lapita sites of the New Guinea region are in the Bismarcks, on islets off the coast of the larger Bismarck islands, occasionally on the coasts of the larger islands themselves. Since (as we shall see) the makers of Lapita pottery were capable of sailing thousands of miles, their failure to transfer their villages a few miles to the large Bismarck islands, or a few dozen miles to New Guinea, was certainly not due to inability to get there.
The basis of Lapita subsistence can be reconstructed from the garbage excavated by archaeologists at Lapita sites. Lapita people depended heavily on seafood, including fish, porpoises, sea turtles, sharks, and shellfish. They had pigs, chickens, and dogs and ate the nuts of many trees (including coconuts). While they probably also ate the usual Austronesian root crops, such as taro and yams, evidence of those crops is hard to obtain, because hard nut shells are much more likely than soft roots to persist for thousands of years in garbage heaps.
Naturally, it is impossible to prove directly that the people who made Lapita pots spoke an Austronesian language. However, two facts make this inference virtually certain. First, except for the decorations on the pots, the pots themselves and their associated cultural paraphernalia are similar to the cultural remains found at Indonesian and Philippine sites ancestral to modern Austronesian-speaking societies. Second, Lapita pottery also appears on remote Pacific islands with no previous human inhabitants, with no evidence of a major second wave of settlement subsequent to that bringing Lapita pots, and where the modern inhabitants speak an Austronesian language (more of this below). Hence Lapita pottery may be safely assumed to mark Austronesians’ arrival in the New Guinea region.
What were those Austronesian pot makers doing on islets adjacent to bigger islands? They were probably living in the same way as modern pot makers lived until recently on islets in the New Guinea region. In 1972 I visited such a village on Malai Islet, in the Siassi island group, off the medium-sized island of Umboi, off the larger Bismarck island of New Britain. When I stepped ashore on Malai in search of birds, knowing nothing about the people there, I was astonished by the sight that greeted me. Instead of the usual small village of low huts, surrounded by large gardens sufficient to feed the village, and with a few canoes drawn up on the beach, most of the area of Malai was occupied by two-story wooden houses side by side, leaving no ground available for gardens—the New Guinea equivalent of downtown Manhattan. On the beach were rows of big canoes. It turned out that Malai islanders, besides being fishermen, were also specialized potters, carvers, and traders, who lived by making beautifully decorated pots and wooden bowls, transporting them in their canoes to larger islands and exchanging their wares for pigs, dogs, vegetables, and other necessities. Even the timber for Malai canoes was obtained by trade from villagers on nearby Umboi Island, since Malai does not have trees big enough to be fashioned into canoes.
In the days before European shipping, trade between islands in the New Guinea region was monopolized by such specialized groups of canoe-building potters, skilled in sailing without navigational instruments, and living on offshore islets or occasionally in mainland coastal villages. By the time I reached Malai in 1972, those indigenous trade networks had collapsed or contracted, partly because of competition from European motor vessels and aluminum pots, partly because the Australian colonial government forbade long-distance canoe voyaging after some accidents in which traders were drowned. I would guess that the Lapita potters were the inter-island traders of the New Guinea region in the centuries after 1600 B.C.
The spread of Austronesian languages to the north coast of New Guinea itself, and over even the largest Bismarck and Solomon islands, must have occurred mostly after Lapita times, since Lapita sites themselves were concentrated on Bismarck islets. Not until around A.D. I did pottery derived from the Lapita style appear on the south side of New Guinea’s southeast peninsula. When Europeans began exploring New Guinea in the late 19th century, all the remainder of New Guinea’s south coast still supported populations only of Papuan-language speakers, even though Austronesian-speaking populations were established not only on the southeastern peninsula but also on the Aru and Kei Islands (lying 70–80 miles off western New Guinea’s south coast). Austronesians thus had thousands of years in which to colonize New Guinea’s interior and its southern coast from nearby bases, but they never did so. Even their colonization of North New Guinea’s coastal fringe was more linguistic than genetic: all northern coastal peoples remained predominantly New Guineans in their genes. At most, some of them merely adopted Austronesian languages, possibly in order to communicate with the long-distance traders who linked societies.
THUS, THE OUTCOME of the Austronesian expansion in the New Guinea region was opposite to that in Indonesia and the Philippines. In the latter region the indigenous population disappeared—presumably driven off, killed, infected, or assimilated by the invaders. In the former region the indigenous population mostly kept the invaders out. The invaders (the Austronesians) were the same in both cases, and the indigenous populations may also have been genetically similar to each other, if the original Indonesian population supplanted by Austronesians really was related to New Guineans, as I suggested earlier. Why the opposite outcomes?
The answer becomes obvious when one considers the differing cultural circumstances of Indonesia’s and New Guinea’s indigenous populations. Before Austronesians arrived, most of Indonesia was thinly occupied by hunter-gatherers lacking even polished stone tools. In contrast, food production had already been established for thousands of years in the New Guinea highlands, and probably in the New Guinea lowlands and in the Bismarcks and Solomons as well. The New Guinea highlands supported some of the densest populations of Stone Age people anywhere in the modern world.
Austronesians enjoyed few advantages in competing with those established New Guinean populations. Some of the crops on which Austronesians subsisted, such as taro, yams, and bananas, had probably already been independently domesticated in New Guinea before Austronesians arrived. The New Guineans readily integrated Austronesian chickens, dogs, and especially pigs into their food-producing economies. New Guineans already had polished stone tools. They were at least as resistant to tropical diseases as were Austronesians, because they carried the same five types of genetic protections against malaria as did Austronesians, and some or all of those genes evolved independently in New Guinea. New Guineans were already accomplished seafarers, although not as accomplished as the makers of Lapita pottery. Tens of thousands of years before the arrival of Austronesians, New Guineans had colonized the Bismarck and Solomon Archipelagoes, and a trade in obsidian (a volcanic stone suitable for making sharp tools) was thriving in the Bismarcks at least 18,000 years before the Austronesians arrived. New Guineans even seem to have expanded recently westward against the Austronesian tide, into eastern Indonesia, where languages spoken on the islands of North Halmahera and of Timor are typical Papuan languages related to some languages of western New Guinea.
In short, the variable outcomes of the Austronesian expansion strikingly illustrate the role of food production in human population movements. Austronesian food-producers migrated into two regions (New Guinea and Indonesia) occupied by resident peoples who were probably related to each other. The residents of Indonesia were still hunter-gatherers, while the residents of New Guinea were already food producers and had developed many of the concomitants of food production (dense populations, disease resistance, more advanced technology, and so on). As a result, while the Austronesian expansion swept away the original Indonesians, it failed to make much headway in the New Guinea region, just as it also failed to make headway against Austroasiatic and Tai-Kadai food producers in tropical Southeast Asia.
We have now traced the Austronesian expansion through Indonesia and up to the shores of New Guinea and tropical Southeast Asia. In Chapter 19 we shall trace it across the Indian Ocean to Madagascar, while in Chapter 15 we saw that ecological difficulties kept Austronesians from establishing th
emselves in northern and western Australia. The expansion’s remaining thrust began when the Lapita potters sailed far eastward into the Pacific beyond the Solomons, into an island realm that no other humans had reached previously. Around 1200 B.C. Lapita potsherds, the familiar triumvirate of pigs and chickens and dogs, and the usual other archaeological hallmarks of Austronesians appeared on the Pacific archipelagoes of Fiji, Samoa, and Tonga, over a thousand miles east of the Solomons. Early in the Christian era, most of those same hallmarks (with the notable exception of pottery) appeared on the islands of eastern Polynesia, including the Societies and Marquesas. Further long overwater canoe voyages brought settlers north to Hawaii, east to Pitcairn and Easter Islands, and southwest to New Zealand. The native inhabitants of most of those islands today are the Polynesians, who thus are the direct descendants of the Lapita potters. They speak Austronesian languages closely related to those of the New Guinea region, and their main crops are the Austronesian package that included taro, yams, bananas, coconuts, and breadfruit.
With the occupation of the Chatham Islands off New Zealand around A.D. 1400, barely a century before European “explorers” entered the Pacific, the task of exploring the Pacific was finally completed by Asians. Their tradition of exploration, lasting tens of thousands of years, had begun when Wiwor’s ancestors spread through Indonesia to New Guinea and Australia. It ended only when it had run out of targets and almost every habitable Pacific island had been occupied.
Guns, Germs, and Steel Page 40