9560

• UCREFRP Catalog Number: 9560
• Author: Valdez, R. A.
• Title: A Generalized Interactive Model to Predict Floodplain Habitat Area Needed to Recover the Endangered Razorback Sucker in the Upper Colorado River Basin - Floodplain Model Version 5.1.
• USFW Year: 2004.
• USFW - Doc Type: Logan, UT.
• Copyright Material: NO

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TABLE OF CONTENTS

Executive Summary . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . v

1.0 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1 Background ............................................................. 2

1.2 Goals and Objectives . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Organization of this Report. . . . . . . . . . . . . ... . . .. . . . . . . . . . . . . . . ... . . . .. . . . ... .

2.0 Methods... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1 Overview ............................................................ 3

2.2 Task Descriptions. . . . . . . . . . . . . . . . ~ . . . .. . . . . . . . . . . . . . . .. . . . . .. . . . . . . . . . . : . 3

3.0 Life History Variables of the Razorback Sucker Used in the Model. . .. ... . ... ... .. . ..... .. ~
3.1 Numbers of Adults. . . . . . . . . . ... . .. . . . . . . ... .. . . . . . . . . . . . . . .. . . . . ... .. . . . ..6

3.2 Sex Ratio .............................................................. 6

3.3 Length-Weight Relationship ............................................. 7

3.4 Fecundity ............................................................. 7

3.5 Survival of Eggs and Larvae ............................................ 7

3.6 Larval Drift ............................................................. 8

3.7 Larval Entrainment in Floodplains ...........................................8
3.8 Growth in Floodplains . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.9 Survival in Floodplains ...................................,............... 9
3.10 Residence Time in Floodplains.. . . . . . . . . . . . . . . . . . . . . . . . . " . . . . . . . . . . . . . . 9
3.11 Survival in the Mainstem . . . . . , . . . . . . . . . . . . . .. . . . . . . .. . .. . . . .. . . . . .. . . . .. . . . 10

3.12 RecruitInent ......................................................... 10

4.0 The Floodplain Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Description of the Floodplain Model . . . . . . . . . . . . . . . . . .. . . . .. . . .. . . . . . . . . . . . . 10
4.2 Structure of the Floodplain Model. . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 How to Access and Navigate the Model ................................... 13
4.3.1 How to Access FLOODPLAIN .. .... .. .. .... .... ... . ........... ..13
4.3.2 Navigating FLOODPLAIN . . . .. . . . . . . . . . . . .. . .. . . . .. . . . . .. . .. . . . . . . . 13
4.4 Step-By-Step Tutorial and Sample Model Run .. . . . . . . .. . . . . . . .. . . . . . . .. . . .14
4.5 Model Sensitivity . . .. . . . .. . . . . . . . . . .. . . . . . . . . . .. .. . . . . . . . . . . . . . .. . . . . . .. . . . 22

5.0 Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . '. . . . . . . . . . . . . . . . . . . . . 26

Literature Cited ................................................................. 33

A d'. . ~1
ppen Ices . . ..' . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. . .. . . .. . . . . . .. . . . . . . . . . . . . . . . . . . . .

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