Material Related to Class Discussion of

The Serengeti-Mara and

East Africa's Rift Valley Area

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 Also See:   [Two Peoples]   

[Sierra Club East Africa 2000] [Tarangire National Park]

[Kenya 2002]


Contents: [Location and Habitat] [The Serengeti] [The Ngorongoro Conservation Area]  [Migration]  [The Serengeti Lions]   [The Masai Mara in Kenya]


The African Continent and The Great Rift

Click on maps for large view.

The East Africa Triangle

Northern Tanzania Safari Circuit

The Serengeti-Mara Ecosystem

Location

     The Great Rift Valley cuts a huge swath in the earth, from Lebanon to the Mozambique Channel, a distance of
some 4,000 miles. The greatest rupture on the earth's land surface, it is the only geological feature that can be seen
clearly from the moon. Its complex system of faults and escarpments has been evolving for some 40 million years.

     This giant "scar" is a truly amazing and mysterious feature. It contains the lowest point on land (the Afar Depression, 510 ft below sea level), is flanked by some of the world's highest and biggest volcanic mountains (including Mt. Kilimanjaro, the highest peak in Africa, at 19,340 ft), holds some of the world's largest lakes (including Lake Malawi, one of the deepest lakes in the world) and provides a seaway between Europe and the Orient (in the form of the Red Sea).

     The geological movements which created the Great Rift have resulted in a rich diversity of terrain and wildlife, from the lush rain forests which clad the volcanic mountains, home of the magnificent mountain gorillas, to the spectacular double chain of lakes which, enriched by minerals, throng with millions of flamingoes. The plains of the Serengeti and Masai Mara, formed by fertile volcanic ash, support the largest concentration of big animals found anywhere on earth. The Rift Valley is also home for dozens of creatures found nowhere else, such as the Simien fox and the giant mole rat of the Ethiopian
Highlands. At its northern "end" the Valley widens and deepens, giving way to the open waters of the Red Sea,
where an astonishing array of fish inhabit the sea's coral reefs.

     Mankind may have even evolved in the Great Rift. Hominid fossils have been discovered dating back nearly 4 million years, and work by paleontologists Louis and Mary Leakey in the Olduvai Gorge of Tanzania has resulted in a wealth of information regarding man's prehistoric past.

Habitat

      The ingredients of natural habitat are 1) proximity to the ocean and its warm moist air, 2) altitude and other topographical features, and 3) soil structure. Habitat vegetation ranges from sweeping grassland plains to original tracts of lush equatorial forest. 

     Along the coast lies a flat, low-lying region with warm breezes from the Indian ocean. This fertile coastline gradually yields to higher altitudes of lush forest which receives abundant rainfall. Progressing westward into the interior the terrain changes dramatically to become the semi-arid Maasai Steppe, which comprises enormous grassland plains that seem to stretch to the horizon. 

     The eastern arm of the Rift Valley in Tanzania, embracing the Ngorongoro Conservation Area and Lake Manyara, divides the steppe from the 1200-m-high (3,937 ft.) central plateau which makes up most of the rest of Tanzania. The Rift's western arm splits from its eastern counterpart to encompass Lake Tanganyika. In the east, below Kilimanjaro, a series of mountain ranges curves east, then turns south and eventually southwest. This mountainous spine preserves precious traces of equatorial forest that used to extend right across Africa.

     The predominant vegetation on the central plateau and in the southwest is woodland, composed of a grassland belt with mainly tropical deciduous tree cover. The Maasai Steppe is open grassland with Acacia-commiphora woodland. In some places such as Tarangire the vegetation is more varied and includes bushland of commiphora, acacias, and giant baobobs. Coastal vegetation includes coconut palms, introduced casuarinas, and tracts of mangroves.

 

 

 

Serengeti Habitats

     The Serengeti is comprised of several habitat types: the short and long grass open plains in the southeast, the acacia savanna in the central Serengeti, the hilly and more densely wooded northern section, and the mountainous and densely wooded western corridor. Along the margins of these areas, and especially in the central Serengeti there are many ecotones or blending zones of habitats.

     Each habitat type supports its complement of animal life: wildebeest, zebra, antelopes and other antelope types frequent the grassy plains, giraffes almost exclusively in the acacia woodland, elephants on the margin of savanna and woodland. Predators follow their preferred food source.

 

 

    "The name Serengeti conjures up images of one of the last remaining wildlife spectacles on earth. Those lucky enough to visit this wilderness area come away with memories of vast herds of antelope feeding on the plains, columns of wildebeest, head to tail, trudging along their traditional migration routes, and prides of lions, sometimes sleeping, sometimes alert and carefully stalking their prey. The extensive grasslands are interspersed with 'kopjes' - rocky outcrops like islands in the flat plain, each with their own wildlife communities. Rivers flow through the Park, providing habitats for a variety of birds, mammals, and reptiles.

      "The Serengeti is one of the largest wildlife sanctuaries in the world, and the commitment to its preservation shown by the government of Tanzania is important in a country faced by land shortage and a rising population."

Lota Melamari, Director General, Tanzania National Parks.

Whistling thorn or ant-galled acacia dominates the drier wind-swept plains. It has a symbiotic relationship to the ants which inhabit its galls.

     Serengeti National Park is nearly 15,000 square kilometers, the largest park in Tanzania and one of the largest in the world. The name comes from a Maasai word meaning "endless plains". And that indeed describes a major component of this ecosystem. The concentration of plains animals which gathers before migrating north is world renowned and unparalleled anywhere else on the planet.

     As we approached the Serengeti from the east, coming down from the Ngorongoro highlands, our first view, as far as the eye could see, was the short grass plains. These plains are interrupted intermittently by copjes,  an Afrikaans word for the rocky outcrops of granite. Pronounced copy, they have been eroded and weathered into  rough and jumbled islands which stand out from the surrounding plain, where volcanic dust and ash has leveled the landscape. 

Superb starlings and other birds are attracted to water at Naabi Hill. 

     The kopjes are habitat islands which provide refuges from the open plains for many plants and animals. [Copje panorama]

Migration

Dry Season

Rainy Season

     During the rainy season, from November through May, the plains are the feeding ground for immense herds of wildebeest, zebras, gazelles, and numerous others such as ostriches, eland, topi, hartebeest etc.  But when the dry season begins and the grass withers, many of these animals, especially the wildebeest and zebra, must move on. This movement takes them generally north and west, where there is permanent water and thunderstorms more frequent. By the end of the dry season in July, most have ended up in the Maasai Mara in Kenya 

 

Video Clip

The Sound of Migration

Above and Below: Wildebeests stop along the Grumeti River near Lobo Camp in the Northern area of the park.

 

     The wildebeest is the dominant herbivore in the Serengeti ecosystem. Its migratory population ranges over a region of about 25,000 sq. km., of which about two thirds is in the national park, the NCA, and the Kenya Maasai Mara Reserve. Wildebeest are very efficient grazers, so much so that they exhaust the available grass and must constantly move on to greener pastures. In May and June lines of wildebeest up to 40 km long have been observed heading north and west to the woodland areas.  

It is also during this period that most of the cows are bred. Bulls can be seen and heard rounding up cows, cutting out bachelor males and bashing heads with territorial neighbors in an all out effort to breed with as many females as possible.  Eight and a half months later the cows drop their calves after migrating back to the short grass plains.  The vast majority of the calves are born during a two to three week period, providing so many calves that predators are overwhelmed and plenty are left over. The predators give birth to their young during this period as well, taking advantage of the abundant food supply.  Populations of both predators and prey benefit from this adaptation. Another adaptation of the wildebeest is the prodigious ability to stand and run with the herd after only a few days.

   Video Clip

  

     Burchell's, or plains zebras, although only one-sixth the numbers of the wildebeest in the Serengeti are still important in the the migration, and in the grazing hierarchy.  Zebras move in family units containing up to a dozen females and young, and bachelor herds of mainly immature males.  Each family is controlled by a stallion, who defends it against potential rivals as well as against predators. Most foals are born in December and January during the wet season. Mares also cooperate in defending the family and protecting foals against predators, and remain in the herd in which they first became pregnant and foal. Because of their cooperation, hyenas hunt in packs against zebras rather than singly as they do with antelopes.

Left: Zebras like to roll in dust. Video Clip

Grazers and Browsers
Elephant Calf 
Elephant Drinking

Warthog (Skip Schirmer)
Dik-dik jumping                                     Buffalo (Terry Hansen)
Thompson's gazelles sparring (Ed Shelley)

Agama lizard
More young elephants                            Topi (Sherry Sybesma)

The Predators
Eagle owl (Sherry Sybesma)
Lion Pride (Lloryn Swan)
Lions at kill (John Murdock)
cheetah (Ed Shelley)

Sherry's Leopard

The Grazing Succession:               A great variety of grazers can coexist on the Serengeti plains and adjacent habitats because each species occupies a slightly different, yet complementary niche. There is a grazing succession in which heavy grazers such as elephants, buffalo, and hippos eat and trample the large coarse grasses, paving the way for lighter grazers such as zebras, topi, and wildebeest who in turn give way to the lightest grazers, the gazelles and warthogs.

Above: Dik-dik, Ed Shelley

Below: Elephants enjoy browsing on the tall coarse grasses.  (John and Sandy Murdock)

     Above: An Elephant family lines up to drink at a Serengeti water hole.

The Seronera area is famous for the leopards, lions, and cheetahs which can usually be seen without difficulty. Leopards are usually seen in the branches of sausage or acacia trees near a watercourse. They often carry their prey up into the branches to get it away from other predators.  They are solitary creatures, the male only associating with the female when she is in estrous.  In the Seronera Valley leopards are known for being relatively placid, in contrast to their usual demeanor. They are always dangerous when they are with cubs.

Male lion, Sherry Sybesma

Two lions yawning, Jim Swan

The Serengeti Lions

    A pride of lions consists of a group of related females which establish a territory in which they capture prey and raise their cubs. Lions are notable for raising cubs communally and many cubs may be born of different females at about the same time.  Bands of male lions will defend territories which may include several prides of females with which they mate. Social interaction is common, including licking, grooming, playing, and greeting behavior, which consists of rubbing heads, or even the whole body together.  Cubs start to eat from a kill at about three months old, but adult males get priority at a kill even over the females who made the kill and may eat up to one quarter of their body weight. (See the lions of Tarangire  and   Video Clip)

Video Clip

Lioness in brush, Jim Swan 

The lions of Serengeti National Park and the Ngorongoro Conservation Area have been extensively studied for more than 20 years.  Many are radio-collared and their movements tracked.   Current studies focus on the criteria of sexual selection, especially the characteristics of the manes of male lions, as well as other things.

See [Serengeti Stories PBS]

You can readily distinguish the males from the females in a pride by their manes and larger size, and if you spend some time watching you can soon recognize individuals. Most lions have scars on their faces and ears, and some may have broken teeth. Also, the pattern of the 'whisker spots' is unique to each lion and is useful for identification because it never changes. Scientists in the Serengeti have specifically identified more than 200 individuals by these methods.

The Masai Mara in Kenya*

 

Nowhere embodies the symbol of wild places better than the Mara-Serengeti ecosystem, a vast tract of land lying astride the Kenya-Tanzania border - a far-off place steeped in mystery.

Two million years ago man’s early ancestors moved onto the plains to eek out a living as hunterer-gatherers. In more recent times Masai herdsman have staked their claim to the grasslands, moving with the livestock according to the seasons, following the rains just like the migratory herds

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When the rains disappear in the Serengeti, the wildebeest and zebras move north, following the rains into the Mara.  It was the Masai, the nomadic cattle people of the East African plains, who named the sea of grass between the Isuria escarpment and the Loita Hills. Mara means “spotted” in the Masai language. Like a cheetah is spotted, the Mara is dotted with acacia in open grasslands, interspersed with braided streams, rivers and dense riverine forest, more than 1500 square kilometers where plains game and predators wander freely in their old abundance.  Within this tapestry are elephants, giraffes, buffaloes, gazelles, topis, wild dogs, hyenas, jackals, vultures, and , of course, the big cats.  Into this kingdom come a million and a half wildebeest and zebras in search of new grazing.

The Masai Mara National Reserve is by far the best known and most beautiful of Kenya 's many wildlife strongholds. It is one of the last places in Africa where huge concentrations of big game can still be seen: elephant, black rhino, buffalo and, above all, lion. Nowhere else are lions so numerous. In all, 22 separate prides roam the Mara's plains, some with more than 40 members

Africa 's other big cats - the leopard and the cheetah - are also abundant, making the Mara a wildlife viewer’s dream. Throughout the year its high, rolling grasslands present a never-ending pageant of predators and plains game. And as July approaches, when the migrating Serengeti wildebeest pour into this kingdom of lions in their hundreds of thousands, the scene is set for the greatest wildlife spectacle on earth.

For two hundred years this was the home of the Masai, but towards the end of the last century their cattle were annihilated by rinderpest and the tribe itself was stricken by smallpox. Soon the Maasai clans were scattered. Their enkang-iti (stockaded villages) lay empty and the land reverted to the wild

This was the Mara that the first Europeans saw: an earthly paradise inhabited only by teeming herds of game and a few honey hunters. The next few decades saw the heyday of the professional hunters, the Out of Africa era of Denys Finch Hatton and Karen Blixen, when rich westerners would pay handsomely for the chance to bag a black-maned Mara lion.

After the Second World War the Mara lay wide open to exploitation. Shooting became an uncontrolled free-for-all and, with the gradual return of the Masai, cattle encroached as far as the tsetse fly would allow. But in 1948 the Mara Triangle - 520 square kilometers of land between the Isuria escarpment, the Mara River and the Tanzanian border - was made a national reserve.

 

 

In 1961 a further 1300 square kilometers was added and the whole area became the Masai Mara National Reserve. It happened just in time. When the killing stopped in that year fewer than ten male lions remained on the Keekorok Plains. In 1984, bowing to pressure from the Masai for the return of vital water holes and dry-season grazing grounds, the government de-gazetted 162 square kilometers of the reserve, effectively reducing the size of the Mara by one-tenth.

Since then other changes have overtaken Masailand. The modern world is closing in.

Great wheat ranches now reach out along the road from Narok to the very edges of the Mara. Masai children go to school, grow up and put aside their red cloaks and long­bladed spears to become doctors, lawyers and Members of Parliament. Yet even in the midst of progress the Mara has survived, a vast sweep of old, wild Africa as it used to be.

 

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Today, the Mara is one of the most popular tourist destinations in Africa , attracting more visitors than the pyramids of Egypt . The money they bring - tourism is Kenya 's primary source of foreign exchange - exceeds US$500 million a year and is the best possible guarantee for the reserve's survival. And, despite the proliferation of lodges, tented camps and tourist vehicles, the Mara remains true to itself - a wildlife showcase without equal

 *Text and map in the above section is taken from Jonathan Scott and Brian Jackman, The Big Cat Diary: A Year in the Masai Mara, BBC Books.

The Ngorongoro Conservation Area

Ngorongoro Photos:
Buffalo
Lilac Breasted Roller
Nursing Zebra
Reclining Lion
Two Zebras Drinking

Giraffe on Hill                                         Crater Panorama                               Stuck Buffalo                              Elephant Chasing Lions (Schirmer)                                     Warthog (Schirmer)

  Video Clip:  

 

 

 

Tourism: Fees paid by visitors go toward maintenance and improvement of facilities and services. Fees also go to the central government and are an important source of foreign exchange.

Education and Research: Scientists from throughout the world come to the NCA for research in anthropology, wildlife biology, botany, geology and other disciplines.

 

 The NCA includes a large area (3200 sq. miles) of interrelated ecosystems consisting of the Crater Highlands (Ngorongoro Crater and surrounding uplands) vast plains, bush and woodland, swamps, lakes and rivers. The plains are part of the great Serengeti ecosystem and many animals move freely from one area to another. 

Climate: Distinct wet and dry seasons characterize the area with most of the rain falling from April to May. Rain in any given area can be quite variable depending on topography and yearly differences. Prevailing winds bring moisture from the Indian Ocean to the east and south sides of the highlands, with the driest areas being the plains and Olduvai gorge in the "rain shadow". From June through October it is mostly dry everywhere. Cold weather sets in during June and July, especially in the highlands, producing dense fog around the crater rim while the crater floor has clear sunny weather.

Protection Status:   The NCA is an example of multi-use protection, administered by an independent body, the NCAA (Ngorongoro Conservation Area Authority) whose purpose is to protect and integrate the following diverse values and interests:

Wildlife: all wildlife is protected throughout the NCA. Hunting for sport is not allowed and strenuous efforts are made to prevent poaching. An endangered species, the black rhino, occupies the crater.

Forestry: The Northern Highlands Forest Reserve protects the natural forest which occurs on the southern and eastern slopes of the highlands. This forest is important as watershed and soil conservation. Agriculture around Lake Eyasi and Lake Manyara depends on the groundwater springs resulting from rain in the highlands.

Ngorongoro Crater, at about 20 km in diameter, is one of the world's largest calderas (a collapsed volcano). Its steep sides, permanent water supply, and surrounding intensive agriculture have reduced migration for many of its species. Many of those that can move freely in and out of the crater tend to stay there to enjoy its lush conditions. For this reason it is one of Tanzania's premier and most visited wildlife viewing areas. This has led some to call it little better than a drive-through zoo. We found it to be a spectacular setting for up close observations of animals and their behavior. The wildlife is certainly habituated to vehicles. Because of this we felt like the proverbial "fly on the wall", the animals behaving as if we weren't there.

Because of isolation and other factors the crater's lion population has been adversely affected in recent years. Much research has been done and is continuing on the lion populations of the NCA and Serengeti. [See The Lions of Ngorongoro Crater ] and [The Crater Lions PBS]

People: Wildlife doesn't have the crater to itself. Local Maasai tribes still bring their cattle into the crater to obtain salt. This practice is scheduled to end soon. Traditionally nomadic, the Maasai have been making permanent settlements in and around the NCA, and supplementing their traditional diet of milk, blood, and meat with grain. Until 1992 no cultivation was allowed within the conservation area. Limited cultivation is now permitted but is scheduled to be phased out.

Anthropology:  The NCA includes Olduvai Gorge where in 1959 Mary Leaky discovered Zinjanthropus (Australopithecus boisei) and Laetoli, where the first human trackway was discovered. These and other stone age sites are protected by the NCAA.

 

Images of Ngorongoro: Click on images and hypertext for the big picture.

     Black rhinos, other herbivores, and their predators tend to hang out near the lerai forest. Lerai is the Maasai word for the yellow- barked acacia which dominate the forest. These have also been called "fever trees" because of the disease of unknown origin contracted by many who sit for long periods under them.

  

    Who can forget the hippo pool with hippos lazing around, lions  alert or rolling around, storks, ibises, crowned cranes, even a buffalo stuck in the mud. And nearby, elephant, zebras, buffalo, warthogs and who knows what else are running and cavorting. Even an elephant chasing lions away. It's a panoply of wildlife.

    And the lush grass plains with herbivores such as wildebeest, Thompson's gazelles, Grant's gazelles, zebra, along with jackals, hyenas, and lions to prey on them.

 

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