River has an essential role in the ecology of rainforest, as water availability has direct impacts on the health of forest and its inhabitants. This is also another unique feature of Western Ghats, which makes the forest look even more beautiful. The transition zone, within sanctuaries and national parks of Nilgiri Biosphere, between terrestrial upland and aquatic environment, is known as riparian zone. Flora and fauna survived in this zone are adapted to periodic flooding. Many not only tolerate it, but require it in order to maintain health and complete their lifestyles.
One of the biggest “human supremacy” induced threat to nature, is initiating invasion of alien floral species. Based on an article, “How alien invasive plant species threaten Western Ghats”, written by V. Sundararaju, in November, 2018 issue of Down to Earth, – “Invasive species don’t allow local species to grow and wildlife to move through. A resin like substance that oozes from such alien species makes the soil acidic, preventing the growth of any other plant species. Species like Lantana, that grow extensively, create a mat-like structure leading to degradation and destruction of the biodiversity. As a result, herbivores like Gaur, Chital and Sambar are deprived of their food. This also affects the survival of carnivores such as tigers and panthers, interlinked to the ecological equilibrium.”
But nature has her own healing mechanism to deal with this human intervention. And that is flood. Based on an article published in online journal, “The Conversation”, authored by D. Paul Humphries, Senior lecturer in Ecology, Charles Sturt University, “When rivers flood, water moves out onto the flood plain. But so does sediment and a lot of organic matter, nitrogen and phosphorus – the energy and materials that fuel river ecosystems….There is in fact mutual exchange of these rich materials between rivers and flood plains”.
This is how the “Riparian Rain Forest” nurturing the kingdom of Bengal Tiger and his ecosystem, through eco-restoration of Nil Giri biosphere.
Hence, the ecological linkage between river, forest and tiger, triggered my next “pandemic time” exploration. Also “the icing on the cake” was company of a friend, known as Paddy, who besides his profession as environmentalist, is also involved in eco-restoration project, at personal capacity in the forest of Nil Giri.
Our first exposure to sign of tigers’ presence in this tiger reserve was through spotting fresh pug marks on forest path, which became muddy because of heavy to moderate down pour at the beginning of our first jeep safari in the evening of 30th September. The question came in everybody’s mind, that those pug marks belonged to whom, which were trailing from muddy forest path to dense undergrowth?
The rain fall occurred a while ago formed small water puddles in the depression on mud created by those footsteps.
The above tiger image of water puddle in pugmarks, taken by Paddy is also symbolic of deep ecological relationship between tigers and water resources of its ecosystem. The home of Bengal Tigers, is fed by many rivers. Particularly the Western Ghats landscape is crucial from that point of view as rivers like Kali, Kabini, Bhadra, Periyar originate here and maintain four most important tiger reserves of Western Ghats. These riverine ecosystem meet Bengal Tigers’ needs and demands of a healthy forest cover, sufficient prey base, vast tracts of inviolate and contiguous space, and enough water sources to survive.
The eco system which is ruled by mighty Bengal Tiger is not fascinating just because of big herbivores, arboreal or birds of prey. Tiger as apex predator, protects the ecosystems by controlling species population in its food pyramid. However the vigor and diversity of this ecosystem depends upon a natural nourishment process. The undergrowth of tropical rainforest plays immense role in that nourishment process.
These forest floor or undergrowth species are spiders, bugs, amphibians and reptiles – commonly known as herpetofauna or “macro subjects” among nature enthusiasts and wildlife photographers.
But somehow the undergrowth species remain unnoticed as we human being tend to focus more on more glamourous big species in forests. However, there are always exception and there are people who devoted their life in conservation of undergrowth species. Kalinga Centre for Rainforest Ecology or KCRE, located in Agumbe is one such organization.
Therefore, after Dandeli and KRT our next stop was KCRE.
Experiencing the ecosystem of Bengal Tiger remain incomplete, if you don’t do that through your all five senses. And, exploration in KCRE exactly provides that opportunity.
Our night walk and day nature trail in KCRE, accompanied by Prashanth and his intern Surya, were never an exception from all these. Rat snake, Beddome’s keelback, Beddome’s cat snake, stick insect, bush frog, house centipede, fishing spider, rubber fly, indirana frog, dancing frog, skittering frog, tiger beetle, wood borer, forest calottes, bi-colour frog and many other undergrowth species we spotted in those days, might have gone unnoticed by many nature enthusiasts, due to their love for more glamorous species of subcontinental tiger habitat.