Part I SUMMARY AND INTRODUCTION
1 Summary: A Bird's-Eye View of Community and Population
Effects of Ontogenetic Development ........................... 3
Historical Background ........................................ 3
Biomass Overcompensation ..................................... 7
Ontogenetic (A)Symmetry in Energetics ........................ 8
Emergent Community Effects of Biomass Overcompensation ...... 11
Ontogenetic Niche Shifts in Consumer Life History ........... 14
Ontogenetic Niche Shifts in Predator Life History ........... 15
Competition between Consumers with and without
Ontogenetic Niche Shifts .................................... 17
Ontogenetic (A)Symmetry in Energetics and Population
Dynamics .................................................... 19
Generalization .............................................. 22
2 Life History Processes, Ontogenetic Development, and
Density Dependence .......................................... 24
Back to Darwin .............................................. 24
Individual- versus Population-Level Assumptions ............. 28
The Population Dynamical Triad .............................. 32
Growth Patterns and the Ecology of Ontogenetic
Development ................................................. 34
Body-Size Scaling and Magnitude of Body-Size Changes ........ 40
Changes in Ecological Roles over Ontogeny ................... 44
Stepping Back—Some Perspectives ............................. 45
Part II ONTOGENETIC DEVELOPMENT AND COMMUNITY STRUCTURE
3 Biomass Overcompensation .................................... 49
A Stage-Structured, Bioenergetics Model ..................... 50
Equal Ingestion Rates ....................................... 64
Unequal Ingestion Rates ..................................... 69
Empirical Evidence .......................................... 86
Asymmetry and Life History Effects .......................... 90
More Complicated Life Histories ............................. 93
Ontogenetic Symmetry and Biomass Overcompensation .......... 107
4 Emergent Allee Effects through Biomass Overcompensation .... 115
Emergent Allee Effects in Stage-Structured Biomass Models .. 116
Emergent Allee Effects in the Kooijman-Metz Model .......... 136
Size-Structured Predators Foraging on Size-Structured
Prey ....................................................... 145
Empirical Evidence for Emergent Allee Effects .............. 159
5 Emergent Facilitation among Predators on
Size-Structured Prey ....................................... 165
Generalists Facilitating Specialist Predators .............. 169
Facilitation between Specialist Predators .................. 175
Multiple Predators and a Single Prey ....................... 186
Experimental Evidence ...................................... 188
6 Ontogenetic Niche Shifts ................................... 196
Consumer-Resource Systems .................................. 198
Consequences for Higher Trophic Levels ..................... 209
Ontogenetic Niche Shifts in Predator Life History .......... 226
7 Mixed Interactions ......................................... 253
Niche Overlap between Stage-Structured Prey and Predators .. 256
Niche Overlap between Size-Structured Prey and Predators ... 281
Empirical Studies .......................................... 292
8 Ontogenetic Niche Shifts, Predators, and Coexistence
among Consumer Species ..................................... 296
Ontogenetic Niche Shifts and Interspecific Competition ..... 297
Ontogenetic Niche Shifts in Both Consumers ................. 311
Effects of Predators on Coexistence of Consumers ........... 317
Part III ONTOGENETIC DEVELOPMENT AND COMMUNITY DYNAMICS
9 Dynamics of Consumer-Resource Systems ...................... 329
A Size-Structured Population Model ......................... 330
Other Size-Dependent Consumer-Resource Dynamics ............ 354
Daphnia-k\ga& as a Model System for the Study of
Stage-Structured Dynamics .................................. 357
10 Dynamics of Consumer-Resource Systems with Discrete
Reproduction: Multiple Resources and Confronting
Model Predictions with Empirical Data ...................... 361
Overall Model Characteristics .............................. 362
Derivation of Individual-Level Model ....................... 363
The Model at the Population Level .......................... 369
Critical Resource Density and Cohort Dynamics .............. 373
Multiple Resources and Ontogenetic Niche Shifts ............ 378
Model Predictions and Empirical Data ....................... 384
11 Cannibalism in Size-Structured Systems ..................... 391
Background Overview ........................................ 392
A Discrete-Continuous Model for Cannibalism ................ 396
Effects of Harvesting Cannibalistic Populations ............ 412
Giant Individuals: Theory and Observation .................. 416
Part IV EXTENSIONS AND PERSPECTIVES
12 Demand-Driven Systems, Model Hierarchies, and Ontogenetic
Asymmetry .................................................. 425
Demand-Driven Systems ...................................... 426
Unicellular Organisms ...................................... 437
Model Hierarchies, Model Simplifications, and Model
Testing .................................................... 439
Development versus Reproduction Control: Ontogenetic
Asymmetry .................................................. 448
Technical Appendices
1 Basic Size-Structured Population Model .................. 451
2 Derivation of the Yodzis and Innes Model ................ 454
3 Derivation of the Stage-Structured Biomass Model ........ 456
4 Equilibrium Computations for Physiologically
Structured Models ....................................... 462
5 Computing Parameter Bounds to Overcompensation in
the Stage-Structured Bioenergetics Model ................ 472
6 Ontogenetic Symmetry and Asymmetry in Energetics ........ 475
7 Mechanisms Leading to Biomass Overcompensation .......... 483
8 Discrete-Continuous Consumer-Resource Models ............ 491
9 A Demand-Driven Energy Budget Model ..................... 496
References .................................................... 505
Index ......................................................... 525
|