lecture 9 2009

lecture 9 2009 - Populations IV Life Tables Turtles and...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Populations IV: Life Tables
Background image of page 1

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

View Full Document Right Arrow Icon
Turtles and Population models The loggerhead turtle (Caretta caretta) Very high egg loss due to beaches being developed, eggs poached Also very high early juvenile loss due to predation – as they disperse into the ocean Turtle conservation in the 1980s focused on protecting eggs and beaches
Background image of page 2
Turtles and Population models 1987 Crouse et al. - programs focusing on preserving turtle eggs will be un-effective; late juvenile/ early adult survival is more important Often caught in fish nets – huge source of mortality Create TEDs to prevent turtles and other large by-catch species drowning 1997 Grand and Beissinger –we must protect eggs on beaches AND use TEDs
Background image of page 3

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

View Full Document Right Arrow Icon
Background image of page 4
TEDs used in Australia
Background image of page 5

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

View Full Document Right Arrow Icon
Population structure affects rates of change Sex (gender) Age Size (better for plants) *Birth, death and movement rates vary by sex, age, or size categories*
Background image of page 6
Human age and sex structure
Background image of page 7

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

View Full Document Right Arrow Icon
Baby boom and social security
Background image of page 8
Structured data Known (or marked) individuals Carcasses Age structure (how many of what age) Sex ratio (how many of what sex)
Background image of page 9

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

View Full Document Right Arrow Icon
Life tables Cohort (dynamic): follow all individuals born in one time interval (e.g. year) until they die Cross-sectional (static): take a snap-shot of the current age-structure Composite: data taken from multiple years
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 23

lecture 9 2009 - Populations IV Life Tables Turtles and...

This preview shows document pages 1 - 11. Sign up to view the full document.

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