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These
communities tend to be large populations of relatively
few species, especially attracting waders and other
aquatic birds numbering in the tens of thousands. Some
lagoons, such as Hottentot's Bay, are almost silted and
are too saline to support any aquatic life, and therefore
any birds. Other lagoons, such as Conception Bay, receive
water only during the spring tides. These older lagoons
are home to both shipwrecks and fossilized creatures from
ancient times. |
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Few creatures can survive on the beaches of the Namib. On these seemingly barren stretches of sand, there is no firm base for either seaweed or animals to anchor or rest. Persistent wave action prevents the deposition of more fertile fine sediments. The animals that do inhabit the beaches survive the battering waves by burrowing into the sand at high tide. Human visitors to the beaches of the Namib have crushed many of these burrowing animals, especially white mussels, while driving along the shore. The beaches of the Namib contain the richest diamond
deposits
in the world, which were not discovered until 1908 near
Luderitz. Because of these valued deposits, access is
restricted to certain coastal areas. The diamonds found
here have been carried up the coast by longshore ocean
currents other than the Benguela. They come from the
bedrock of ancient seacoasts, which are now submerged. It
is believed that they were delivered to these ancient
shores by prehistoric rivers from volcanic deposits
inland, or may have been formed by volcanic action
undersea. There are only three areas -- Luderitz,
Sandwich, and Walvis Bay -- where sandspits and rocky
areas provide shelter and dampen the effect of the waves
that hit the shore. In these coastal wetlands, finer
sands and silt settle in the intertidal region. These
sands contain a rich microflora that is feasted on by
tiny snails and worms. These small wetlands, which amount
to less than 12 square miles (30 square km) of area, are
an integral part of the Namib's ecosystem. |
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