ABSTRACT

Habitat use and selection influence population dynamics, interspecific and intraspecific interactions, ecosystem structure, and biodiversity (Morris 2003). Ontogenetic shifts in movements and habitat use are common if not ubiquitous among animal taxa (e.g., Wilbur 1980; Hart 1983; Vuorinen, Rajasilta, and Salo 1983; Werner and Hall 1988; Dickman 1992), especially fishes (Werner and Gilliam 1984; Werner 1986; Werner and Hall 1988; M. Jones et al. 2003). In teleosts with indirect development, individuals increase in mass by three or four orders of magnitude over their lifetimes and undergo complete changes in feeding modes and patterns of habitat use. Ontogenetic shifts in diet are common among many

CONTENTS

7.1 Introduction ........................................................................................................................ 319 7.1.1 Background and Concepts ................................................................................... 319 7.1.2 Habitat Use and Selection ..................................................................................... 321 7.1.3 Home Range and Activity Space ......................................................................... 321 7.1.4 Taxonomic Breadth of Published Studies ........................................................... 322

7.2 Ontogenetic Shifts in Habitat Use ................................................................................... 322 7.2.1 Patterns in Juvenile Activity Space ..................................................................... 322 7.2.2 Changes between Juvenile and Adult Habitats ................................................. 325

7.3 Vertical Shifts in Habitat Use ........................................................................................... 329 7.3.1 Changes in Vertical Movement Patterns ............................................................ 329 7.3.2 Changes in Habitat Depth ....................................................................................330