Elephants are keystone species and are like the gardeners, engineers and
architects of many ecosystems. Without elephants many other species would
suffer as they are a vital link in the ecosystem and play a profound role.
A keystone species is a species that has a large affect on its
environment relative to its abundance. It is a species which plays an important
role in maintaining and balancing the structure of an ecological community and
affecting many other organisms within this community. The loss of
elephants from one particular site would mean that all the biological
interactions and ecosystem processes in which they are involved, would also be
lost.
Elephants as seed dispersers
Elephants
disperse seeds by eating them, transporting them, and then spreading them
through their dung. The overall body size of an elephant and their highly
frugivorous diet make them particularly impressive seed dispersers. Out of the
three species of elephants, African forest elephants (Loxodonta
cyclotis) are the most effective dispersers of seeds and they
disperse more intact seeds than any other African forest animal. They are also
responsible for spreading seeds the longest distances. In one study, it was
found that elephants dispersed seeds over 57km, whereas most animals will just
spread seeds a few hundred meters away from the source. There are some plant
species which depend entirely on elephants for their dispersal. For example, in
Uganda, the seeds of a plant called ‘Balanites Wilson’ are completely
dependent on savannah elephants (Loxodonta africana) to consume and
disperse their seeds, as no other animals perform this function. Elephants are
able to rejuvenate some habitats due to them constantly transporting many
different species of seeds and their ability to disperse seeds long distances.
The
importance of elephant dung
After
seeds are dispersed by elephants, their dung provides a suitable germination
environment in which seeds can grow. It is very common to find fungi growing in
elephant dung as it provides the ideal environment.
Elephant dung is extremely rich in minerals and is very fibrous. This is
because only about 50% of what elephants eat is actually digested. Thus,
elephant dung is extremely important in nutrient cycling, as dung provides rich
nutrients to soils, acting as a great fertilizer.
Elephant dung also provides an important food source for other species.
Many species will feed on elephant dung as it is a treasure cove of nutrients.
These species include ground hornbills, banded mongooses, velvet monkeys,
baboons and many insect species. For dung beetles, elephant dung is extremely
important. The beetles roll balls of dung and bury them to store as a food
supply for their larvae. This then provides the honey badgers with a rich food
source as they will then dig up the dung beetle balls and feed off the plump
grubs inside.
Elephants also provide an opportunity for other animals to feed on rich
fruits. For example, in Africa , elephants can
almost stand on tip toes to reach and tear the very high branches of protein
rich acacia trees. This means that all the beanlike pods which rain down from
these movements provide a feast for nearby wildlife, including warthogs, kudu
and baboons.
Not only does dung provide food for other species, it also provides a
suitable habitat for them, suggesting that a dung pile could be a small
ecosystem in itself! For example, many invertebrates including beetles, ants,
centipedes, millipedes, scorpions, crickets, spiders and termites are found
living in dung. Not only are invertebrates found living in elephant dung but,
recently in Sri Lanka ,
it was discovered that there were 3 species of frogs that also reside in dung.
The exact reason why frogs live in dung is unknown, but it is thought that dung
provides a good shelter and provides the frogs with amble opportunity to feed
on its invertebrate neighbors.
Elephants as water providers
Elephants also provide water for other species. The desert elephants in Africa will travel miles in search of water and they will
remember underground spots for water in which they will dig wells. This water
is then opened up for other animals, enabling them to drink. In Kenya, people
will actually follow elephants for many miles, as the elephants will lead them
to water sources.
Elephants as habitat modifiers
Elephants are like engineers, as they alter and modify habitats by
pushing over trees, stripping bark from trees and generally stomping around
being elephants. For example, in Africa they
transform woodlands into open savanna, creating grazing habitat for dozens of
grassland species. When they move on, the savanna grows into scrubs for a host
of browsing animals and then once more becomes woodland.
Elephants also open up dense woodlands by creating forest gaps. They
open up dense woodland canopies, allowing a proliferation of species into the
light gaps which are created. These light gaps help to diversify tropical
forests. The upper canopy layers intercept so much light that little reaches
the forest floor. Under-storey vegetation is therefore very sparse, reflected
by low numbers of vertebrates found on the forest floor. Elephants create and
expand these gaps and, in the process, open up a more productive and varied
ground layer to a range of other vertebrates, including gorillas, forest hog,
bush pig, bongo, buffalo and duiker.
Asian and African
elephants are facing dramatic population declines because of habitat loss and
fragmentation, human-elephant conflict and poaching, all human induced
activities. Numbers of elephants worldwide have plummeted in the last century.
If we do not do anything to help these beautiful creatures then in our lifetimes
they will become extinct. Not only would this be a tragedy that humans allowed
to occur, but the loss of elephants would have detrimental effects on the
ecosystem.
This was a very informative, and educational article. It was simplistically perfect for my 9 yr. old daughter to read and comprehend for her science project on the savanna ecosystem!
ReplyDeleteThank you!
Very interesting point about elephants dispersing seeds in their dung. If you think about what do elephants eat, they spread all types of seeds from various vegetables, fruits, and even grasses. They travel for miles to find food sources and eat hundreds of pounds of food a day - that's a lot of dispersing.
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ReplyDeleteHello, i just started a blog where i would like to talk more about problems, innovations and tell stories about nature itself. here: https://tiazim.com/what-are-keystone-species/i also talked about elephants as ecosystem engineers.
ReplyDeleteThese creatures are really amazing, whenever i read about them i found them even more fascinating.
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