Ecology – Study Notes
For Jammu & Kashmir PSC – General Awareness & Current Affairs
1. Simple Explanation
Ecology is the branch of biology that studies the relationships between organisms and their environment. It looks at how living things interact with each other, with the physical world (air, water, soil), and how these interactions shape the structure, function, and distribution of life on Earth.
Key idea: Ecology links the small‑scale interactions of organisms to the large‑scale patterns of biodiversity and ecosystem services that sustain human life.
2. Key Points
| Theme | What You Need to Know | J&K Relevance / Current Affairs |
|---|---|---|
| Levels of ecological organization | Individual → Population → Community → Ecosystem → Biosphere | J&K’s forest sector works at population (e.g., Cedrus deodara stands) and ecosystem (e.g., Himalayan temperate forests). |
| Ecosystems & Biomes | Forests, grasslands, deserts, wetlands, marine | Ladakh’s Tibetan Plateau (cold desert), Kashmir Valley’s temperate forest, Himalayan montane forest. |
| Abiotic & Biotic Components | Abiotic: light, temperature, soil, water, nutrients. Biotic: plants, animals, microbes. | Glacial meltwater (abiotic) affects trout populations (biotic). |
| Ecological Relationships | Competition, predation, mutualism, commensalism, parasitism | Predator‑prey dynamics in Dachigam National Park (snow leopard ↔ ibex). |
| Food Chains & Webs | Linear links → complex networks. | The food web of the Himalayan trout involves plankton → insect larvae → trout → birds. |
| Energy Flow & Biogeochemical Cycles | Energy enters via photosynthesis → moves through trophic levels. Carbon, nitrogen, phosphorus cycles. | Carbon sequestration by J&K forests mitigates climate change. |
| Biodiversity | Species, genetic, ecosystem diversity. | J&K hosts ~8,000 plant species, ~16,000 animal species (Fauna). |
| Ecosystem Services | 1. Provisioning – timber, fruit, medicinal plants. 2. Regulating – climate regulation, water purification. 3. Cultural – tourism, spirituality. 4. Supporting – nutrient cycling, soil formation. | Eco‑tourism in Ladakh provides cultural & regulating services. |
| Human Impacts | Deforestation, pollution, over‑extraction, invasive species, climate change. | 2023–24: 5% increase in forest cover due to afforestation; glacial retreat in Zanskar range. |
| Conservation & Sustainability | Protected areas, sustainable forestry, restoration ecology, community participation. | Dachigam, Bhadarwah, Zanskar Wildlife Sanctuaries; Sustainable Tourism in Ladakh (2023). |
| Current Policies & Initiatives | 1. Forest (Conservation and Management) Act, 1980 2. J&K Forest Policy 2020 3. National Green Tribunal (NGT) decisions |
• 2024: J&K launched “Green J&K” afforestation program. • 2023: MoU with WWF for Himalayan biodiversity conservation. • 2024: J&K participated in COP28, presenting glacial melt research. |
3. Worked Example
Problem:
A research team sampled a 10 ha plot in the Kashmir Valley forest and recorded the following tree species abundances:
| Species | Count |
|---|---|
| Betula utilis | 30 |
| Alnus nepalensis | 20 |
| Pinus roxburghii | 25 |
| Quercus semecarpifolia | 15 |
| Abies pindrow | 10 |
Question:
Calculate the Shannon–Wiener diversity index (H') for this plot.
Step‑by‑Step Solution
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