Ecology: General Awareness & Current Affairs Notes for Lakshadweep Police Sub-Inspector (SI)

Ecology – Study Notes for Lakshadweep Police Sub‑Inspector (SI)

Purpose – To provide a quick, clear and exam‑friendly reference on the subject of Ecology that can be used for revision and interview preparation.

1. Simple Explanation

Ecology is the science that studies the relationships between living organisms and their environment.
It looks at how organisms interact with each other and with non‑living components (air, water, soil, climate) in order to understand the structure, function, and dynamics of ecosystems.

Key takeaway – Ecology answers “how do living things survive, reproduce, and change the world around them?”

2. Key Points & Concepts

Category	Concept	Definition	Example (Lakshadweep context)
Core Terms	Ecosystem	A community of living organisms plus their physical environment.	Coral reef ecosystem of Lakshadweep.
	Biodiversity	Variety of life at all levels (genes, species, ecosystems).	High diversity of reef fish, molluscs, mangroves.
	Habitat	Physical location where a species lives.	Seagrass beds, mangrove swamps.
	Niche	Role of a species in its ecosystem.	A reef fish that feeds on algae.
	Keystone Species	Species with disproportionate influence on ecosystem structure.	Sea otters (in other ecosystems) – in Lakshadweep, clownfish may act as keystone by cleaning coral.
Ecological Processes	Carbon Cycle	Movement of CO₂ between atmosphere, biosphere, oceans, and lithosphere.	Coral calcification absorbs CO₂.
	Nitrogen Cycle	Conversion of nitrogen into various chemical forms.	Nitrogen fixation by marine bacteria in seagrass beds.
	Trophic Levels	Feeding positions in a food chain.	Herbivore → primary predator → apex predator.
	Ecological Succession	Gradual change in species composition over time.	Succession from algae to coral dominance after a reef disturbance.
Human Impact	Ecological Footprint	Measure of human demand on natural resources.	Calculate footprint of a Lakshadweep resort.
	Carrying Capacity	Maximum population an environment can support sustainably.	Fish stock limits for local fisheries.
	Habitat Destruction	Loss of natural habitat due to human activity.	Coral bleaching caused by rising sea temperatures.
	Marine Pollution	Introduction of harmful substances into the ocean.	Plastic waste on Lakshadweep beaches.
Conservation & Policy	Protected Area	Region managed for conservation.	Lakshadweep Marine Protected Area (MPA).
	Sustainable Development	Meeting present needs without compromising future generations.	Eco‑tourism on small islands.
	International Environmental Treaties	Global agreements on environmental protection.	Paris Agreement, Convention on Biological Diversity.
	National Policies	Indian laws and plans on ecology.	National Action Plan on Climate Change, National Biodiversity Authority.

3. Worked Example – Assessing the Ecological Footprint of a Lakshadweep Island Resort

Goal: Estimate the annual ecological footprint (in global hectares) of a small resort that hosts 200 guests per week.

Step 1: Define the Activity

Activity	Units	Data
Guest stay	Nights	200 guests × 7 nights = 1,400 guest‑nights
Food consumption	kg food	1 kg per guest per day × 1,400 = 1,400 kg
Energy use	kWh	20 kWh per guest per day × 1,400 = 28,000 kWh
Water consumption	L	150 L per guest per day × 1,400 = 210,000 L
Waste generation	kg	0.5 kg per guest per day × 1,400 = 700 kg

Step 2: Convert to Standard Units

Energy: 28,000 kWh = 28 GJ (1 kWh = 3.6 MJ)
Water: 210,000 L = 210 m³
Waste: 700 kg

Step 3: Apply Conversion Factors

Resource	Conversion Factor (to global hectares)	Footprint
Energy	0.0025 g.ha⁻¹ per kWh (global average)	28,000 × 0.0025 = 70 g.ha
Water	0.0005 g.ha⁻¹ per m³	210 × 0.0005 = 0.105 g.ha
Food	0.1 g.ha⁻¹ per kg (average)	1,400 × 0.1 = 140 g.ha
Waste	0.0001 g.ha⁻¹ per kg	700 × 0.0001 = 0.07 g.ha

Step 4: Sum Up

Total Footprint = 70 + 0.105 + 140 + 0.07 ≈ **210.2 global