BIOLOGICAL TERM OF THE DAY....

CHECK YOUR GRASP OF THE PREVIOUS CLASS......

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PATTERNS OF BIODIVERSITY

By Geeta Bhadauria

🌂TROPICS HAVE REMAINED UNDISTURBED COMPARATIVELY FOR A LONGER PERIOD OF TIME.

🌂TROPICAL ENVIRONMENTS ARE MORE CONSTANT AND PREDICTABLE

🌂AVAILABILITY OF HIGHER SOLAR ENERGY LEADS TO HIGHER PRODUCTIVITY​

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​REASONS FOR HIGHER BIODIVERSITY IN TROPICS

​GIVEN BY A GERMAN NATURALIST ALEXANDER VON HUMBOLDT WHILE EXPLORING THE WILD IN SOUTH AMERICAN JUNGLES

​SPECIES - AREA RELATIONSHIP CURVE

🌂WITHIN A REGION SPECIES RICHNESS INCREASES WITH THE INCREASED EXPLORED AREA BUT ONLY UP TO A LIMIT.

🌂THE GRAPH IS A RECTANGULAR HYPERBOLA.

🌂 S= SPECIES RICHNESS

A= AREA

Z= SLOPE OF THE LINE

( REGRESSION COEFFICIENT)

C=Y-INTERCEPT​

​🌂 VALUE OF Z RANGES FROM 0.1- 0.2 IRRESPECTIVE OF TAXONOMIC GROUP

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THE VALUE OF 'Z ' IS SIMILAR

​THE VALUE OF Z RANGES FROM 0.6 TO 1.2 IN THE CASE OF VERY LARGE AREAS LIKE FULL CONTINENTS.

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A pattern in species richness is also observed as one moves along an elevational gradient; generally, species richness is thought to decline with increasing elevation

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ALTITUDINAL / ELEVATIONAL GRADIENT

CCT QUESTION...

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​VALUE OF Z ( REGRESSION COEFFICIENT)IS CONSIDERED FOR MEASURING THE SPECIES RICHNESS OF AN AREA. IF A NATURALIST WORKING ON A FOREST FLORA AND FAUNA FOUND THE VALUE OF Z IS 0.7 FOR AREA (A) AND 0.15 FOR AREA (B), WHICH AREA HAS HIGHER SPECIES RICHNESS AND STEEPER SLOPE?

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