Forestry: Forest Types and Forest Ecology
Classifying Maharashtra's forests
Champion and Seth's rainfall-and-temperature framework is what the exam expects. Tropical Wet Evergreen (above 250 cm, sheltered Western Ghats valleys only), Tropical Semi-Evergreen, Tropical Moist Deciduous (100–200 cm; teak country of Vidarbha and the Sahyadri foothills), Tropical Dry Deciduous (70–100 cm; teak, ain, dhawda, tendu), Tropical Thorn (below 70 cm; Marathwada and Khandesh - Acacia, Zizyphus, Euphorbia), and Littoral/Mangrove along creeks (Rhizophora, Avicennia with pneumatophores).
Ecology essentials
Energy flows one way - producer to herbivore to carnivore - with only about 10% transferred at each step (Lindeman). Nutrients cycle; energy does not. Pyramids of numbers and energy are upright, but biomass pyramids invert in oceans. Succession runs hydrarch (pond → marsh → meadow → forest) or xerarch (bare rock → lichen → moss → shrub → forest) towards a climax community. Also learn keystone species, edge effect, canopy stratification and decomposition.
Worked example
If producers fix 10,000 kcal, the herbivore level receives about 1,000 kcal and the secondary consumer about 100 kcal. Reasoning: 10% ecological efficiency per transfer; the remainder is lost as heat in respiration.
Traps
Energy is never recycled. Pneumatophores are aerial breathing roots, not just props. Maharashtra's teak forest is deciduous - true evergreen is a narrow, very high-rainfall type. Thorn forest is not 'degraded deciduous'; it is a climate-defined type.