5(a) Adaptive primate radiation
10 Marks150 words
Syllabus: Paper I > 1.5 Characteristics of Primates > Evolutionary trend and primate taxonomy
Adaptive Primate Radiation — 2019 Paper I
Question · 2019 · Paper I · 10 Marks
Adaptive primate radiation
Model Answer
VAID ICSApproach
- Demand of Question: Explain adaptive radiation in primates and show how ecological diversification produced different primate forms.
- Structuring the Response: Define the concept, relate it to diet, habitat and locomotion, and illustrate major primate adaptive types.
- Key Dimensions to Cover: Arboreal adaptation, ecological niches, prosimians, monkeys, apes, locomotion, diet and evolutionary diversification.
Model Answer
Introduction: Adaptive radiation refers to the evolutionary diversification of a common ancestral stock into multiple forms adapted to different ecological niches. Primates provide a major example, having diversified in relation to habitat, diet, locomotion and social behaviour.
Major adaptive directions:
- Arboreal insectivory/frugivory: Early primates developed grasping extremities, nails, enhanced vision and flexible limbs for life in trees.
- Vertical clinging and leaping: Seen in tarsiers and many lemurs, involving powerful hind limbs and elongated tarsal elements.
- Arboreal quadrupedalism: Common among several monkeys such as capuchins and guenons.
- Terrestrial quadrupedalism: Baboons and patas monkeys show adaptations to extensive ground locomotion.
- Suspensory locomotion: Gibbons evolved brachiation, while orangutans use quadrumanous climbing.
- Knuckle-walking: Chimpanzees and gorillas combine terrestrial locomotion with retained climbing adaptations.
Dietary radiation also produced folivorous, frugivorous, insectivorous and omnivorous specializations.
Thus:
Common primate ancestry → Ecological opportunity → Different niches → Adaptive diversification
Conclusion: Primate adaptive radiation demonstrates how ecological pressures and behavioural flexibility generated the remarkable anatomical and locomotor diversity seen among living and fossil primates.
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UPSC Anthropology Optional 2019 — Paper I
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10 Marks150 words
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10 Marks150 words
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10 Marks150 words
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