Power6b_PopulationBiology - 1 Unitary vs Modular organisms...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Unitary vs Modular organisms • Unitary organisms develop from zygote to adult with determinant form • Modular organisms grow by repeated interations of its parts (modules) into an adult of indeterminate form (coral, poison oak) – Genet: genetic individual, all the biomass that derived from single embryo – Ramet: subunit of genet that is physiologically viable as an autonomous fragment 2 Currencies: energy, nutrients, time growth maintenance activity Reproduction: offspring quality offspring quantity Allocation? unitary modular 3 Life history trade offs Life history trade offs of plants or animals • Starting growth early in the season entails risk of freezing • If reproductive resources allocated to larger seeds, plant makes fewer, so incurs more predation risk, and risk of bad luck (unfavorable microsites) • Dispersal: reduces competition with parent, but increases risk of unsuitable habitat. Bet hedging by sea rocket—half the seed pod floats, half sinks 4 Life history tradeoffs Allocation to reproduction comes at expense of individual’s own growth, and possibly survival (and vice versa) If resources are stored rather than spent on offspring, a plant can quickly replace tissue lost to grazing, fire, wind, and can survive over periods of starvation (e.g. deciduous trees in winter) Fig 52.6, Campbell 5 Trade-offs 6 Population biology • Demography : study of how the vital rate of individuals (birth, death, growth) affect structure and dynamics of populations • Population : group of potentially interbreeding individuals (same species, co-occur in time and space)...
View Full Document

This note was uploaded on 04/01/2008 for the course BIO 1B taught by Professor Carlson,mischel,power during the Fall '07 term at Berkeley.

Page1 / 6

Power6b_PopulationBiology - 1 Unitary vs Modular organisms...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online