5popreg - BIO 20 POP REG 1 POPULATION REGULATION 1...

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BIO 20 POP REG 1 POPULATION REGULATION 1. INTRODUCTION population growth - limited by environment density dependent factors - not constant, proportional to density - pred, comp, stress, disease, behavior - esp. vertebrates density independent factors - not related to pop density - physical envi, weather, temperature - esp. insects 2. INTRA SPECIFIC COMPETITION intraspecific - between individuals in same species competition - for resources in short supply & critical for survival - usually food, water, space, mating - less if low density, abundant resources scramble - population shares resources equally - allows pop to fluctuate chaotically - pop density lower than possible contest - better-adapted obtains more - others not survive or reproduce - adjust pop to match resources 3. SOCIAL STRESS hormones - retards body growth - curtails reproduction - delays sex activity aggression - fighting behavior - from crowding & excess contact - increases offspring mortality disease & parasitism - reduces immunity & resistance - facilitates infection
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BIO 20 POP REG
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