How the EDT Model Uses Life History

An Overview

Level 1- Wide range of data types

Level 2-Environmental Attributes

Level 3- Survival Factors

Act as umbrella attributes (classes of attributes) - "through the eyes of species" - short list

Survival factors define the relative contribution of different attribute classes to mortality

Data pyramid for deriving relative contribution of ecological attributes to life stage survival

EDT – Habitat Model Results = Species Habitat Potential

Raw Data andObservations

Species-Neutral Environment

Species-Life Stage View of Environment

The Beverton-Holt Function

Equilibrium Abundance

Recruits/Spawner (Density Dependent

Productivity)

Rec

ruits

(r

etur

ning

adu

lts/s

paw

ner)

Spawners(number in first generation)

Habitat Capacity

Habitat (Density Independent)

Productivity

EGGS

JUVENILES

SMOLTS

SUBADULTS

SPAWNING ADULTS

Aggregate Life Stage P = Population P

Number in first generation(e.g. spawners)

Num

ber i

n ne

xt g

ener

atio

n(e

.g.re

turn

s)Number in first generation

(e.g. spawners)

Num

ber i

n ne

xt g

ener

atio

n(e

.g.re

turn

s)

Number in first generation(e.g. spawners)

Num

ber i

n ne

xt g

ener

atio

n(e

.g.re

turn

s)

Number in first generation(e.g. spawners)

Num

ber i

n ne

xt g

ener

atio

n(e

.g.re

turn

s)

VSP-Relevant Parameters• Habitat Capacity• LS/Pop. Productivity• Equilibrium Abundance• DiversitySurvival (limiting) factors

Life History InformationUsed Here

Need to Think Broadly About Historical Potential!!

The EDT CornerstonesModel Habitat Environment

Species/Habitat Rules

Habitat Potential

Trajectory GeneratorTrajectory Generator

Reference scenario maximum potential Difference restoration potential Model for potential life history

expression

EDT Compares Scenarios

Reference Condition(Ideal)

PatientTemplate

Current or Future Condition (Degraded)

Loca

tion

O

cean

Hea

dwat

ers

Time (lifestage)

Trajectories Travel Through a Survival Landscape

Prespawning

Incubation

Fry Colonization

Summer Rearing

Overwintering

Migration

Time

Trajectories = range of life history expression

Different pathways have different survival rates

Survival (limiting) factor effect on LS productivity

Combined success rate = habitat productivity

% successful = diversity index

In Closing… Life history information used to parameterize

EDT trajectory generator

Emphasize both existing AND potential life history diversity

Don’t be too literal! Need to represent potential diversity (not just what exists today)

EDT selects successful trajectories

Level 2s + Sensitivity = Effect on P

CHANNEL MORPHOMETRY3 Channel Attributes

WATER QUALITY/BIOTIC STRESSORS13 Water Quality and Biotic Attributes

HYDROLOGY7 Flow Attributes

TEMPERATURE3 Temperature Attributes

CHANNEL/HABITAT CHARACTERISTICS20 Channel/Habitat Attributes

Survival Factors

Integrated Survival Factor Productivity

Creates Survival Landscape

No Effect (Optimal)

Low Effect

Moderate Effect

High Effect

Extreme/Lethal Effect