LUTEMBE – Numbering millions, they fly at once in patterns,
blocking light from the sky. In a mind-boggling
A mixed flock of gulls make for interesting watching at the
site.
It is baffling how they do not knock each other while in
flight or why they can never be hit if one lobbed a stone in their midst.
Experts say they have a complicated navigation system that
enables some of them to fly from as far away as Siberia non-stop to Lutembe Bay
on the shores of Lake
Victoria in Uganda. And these are not stealth bombers. They are terns — migratory
birds.
For centuries, Lutembe Bay has been hosting both native and
millions of Palearctic migrant birds. They come mainly from the arctic region
that includes mainland Europe, Scandinavian countries and as far away as
Russia.
They live nine months of the year here and only go back to
Europe to breed. Some fly non-stop to and from the Caspian Sea. However, this
allure at Lutembe Bay, one of the biggest breeding sanctuaries for migratory
birds, is now threatened by human activity if nothing is urgently done.
Achilles Byaruhanga, the executive director of Nature Uganda, says toxic agrochemicals
suspected to have leached from the nearby flower farms have been detected in
the waters around this Ramsar Site – wetland of international importance.
Byaruhanga says Lutembe Bay is threatened first, by water
abstraction – a process where large quantities of water is drawn to water the
flower farms.
“Because of this draining, the marshy water at the bay will
become muddy, leading to other vegetation to colonize the area, thus reducing
not only the habitat and the feeding area for the birds, but also their
roosting space,” Byaruhanga says.
Secondly, he says following a 16-year study, agro-chemicals
have now been detected in the waters at the bay. This when not controlled, he
says, will pollute the waters and not only threaten the fish stocks, but human
beings as well.
Lutembe Bay hosts over 70% of the global population of
white-winged black terns (Chlidonias leucopterus), large numbers of the
grey-headed gulls (Larus cirrocepharus), black-headed gulls (Larus ridibundus)
and gull-billed terns (Sterna nilotica).
In 2000, Lutembe hosted almost the entire population of the
white-winged black terns — over 3.5 million birds. The birds start coming from
September to October every year and go back between February and March.
In Europe, they are again seen between May and June. Every
year, the birds come with their young, hatched the previous season.
The hatchlings are left behind to practice breeding. At this
stage, their all–white colour changes to black. Others only have their heads
change to black. This change of colour is called breeding plumage.
When it is time to go back and breed, the young ones fly as
black birds, breed and come back to Lutembe when they are white. The cycle has
been going on for centuries.
“If Lutembe is affected, tourism would suffer not only in
Uganda, but also in Europe as the breeding pattern of the birds would be
destroyed. If they do not get places like Lutembe, they will not breed. These
birds must be given an opportunity to practice breeding,’’ Byaruhanga argues.
He says Uganda receives the biggest share of all Palearctic
birds in Africa due to the country’s big and fresh water masses.
Other areas in the country that attract migratory birds
include the Kazinga Channel and Musambwa Island. The
birds feed on insects and small fish.
Records from Nature Uganda show that Uganda earns over $6m
(sh15.3b) from birding tourism, doubling earnings from gorilla tracking.
Birding is a high-end tourism product, where birders stay long, leaving more
money in the country.
The tourism sector is the second largest foreign exchange
earner and generated $805m (about sh2.1 trillion) in foreign exchange earnings
in the fiscal year 2011/2012. In particular, the sector’s total contribution to
GDP is estimated at $1.4b (about sh3.5 trillion), representing 7.6% of GDP; in
the year 2011, trailing only remittances from abroad.
Uganda was recently declared a preferred bird watching
destination 2013/2014, a development expected to uphold the country as a
birder’s paradise.
About half of all bird species in Africa can be found in
Uganda. The country supports more than 1,000 bird species, representing about
50% of the bird species in Africa and 11% of the birds’ global population.
Lutembe is home to 280 species of both water and non-water
birds. Apart from Palearctic migrant birds, Lutembe is also home to seven
globally threatened species like papyrus yellow warbler, papyrus gonolek,
shoebill, African skimmer great snipe and Madagascar Squacco, among others.
A team from Nature Uganda spotted a new migrant species, the
great knot, in 2010. The site also hosts hundreds of Palearctic ducks like the
garganey (Anas querquedula).
At an altitude of 1,130 metres, covering an area of about
800 hectares, Lutembe
Bay is shallow, papyrus-fringed, and almost completely cut off from the
main body of Lake
Victoria by two papyrus islands.
The biggest congregations of the European birds at Lutembe
are gulls and terns, which roost on islets when the water level is low, between
September and March.
En-route to Uganda, the terns have stop-over in Sudan and
Egypt along the River Nile while the gulls can fly from the Caspian Sea to
Lutembe non-stop.