Access digital copies of guides and regulations publications from the Nebraska Game and Parks Commission.
Issue link: http://digital.outdoornebraska.gov/i/720963
vi TABLE OF CONTENTS PREFACE .................................................................................................................................................. viii ACKNOWLEDGEMENTS ......................................................................................................................... ix INTRODUCTION ........................................................................................................................................ 1 History of crayfish collecting in Nebraska............................................................................................ 1 THE NEBRASKA LANDSCAPE ............................................................................................................ 2 The Western Corn Belt Plains ............................................................................................................... 3 The Central Great Plains ....................................................................................................................... 3 Northwestern Glaciated Plains .............................................................................................................. 5 Northwestern Great Plains .................................................................................................................... 5 The Nebraska Sand Hills....................................................................................................................... 6 Western High Plains ............................................................................................................................. 6 CLASSIFICATION AND TAXONOMY OF CRAYFISH ..................................................................... 8 ANATOMY ................................................................................................................................................ 10 External Anatomy ................................................................................................................................... 10 Internal Anatomy .................................................................................................................................... 11 THE BIOLOGY OF CRAYFISHES .......................................................................................................... 13 Habitats ............................................................................................................................................... 13 Behavior .............................................................................................................................................. 14 Reproduction ....................................................................................................................................... 14 Food and feeding ................................................................................................................................. 17 Molting and Growth ............................................................................................................................ 18 Production ........................................................................................................................................... 20 Commensals, parasites and diseases ................................................................................................... 20 "Blue" crayfish .................................................................................................................................... 21 Role in aquatic communities ............................................................................................................... 21 AS AN INVASIVE SPECIES ................................................................................................................ 22 IDENTIFICATION ................................................................................................................................. 23