scholarly journals Predicting coexistence in species with continuous ontogenetic niche shifts and competitive asymmetry

Ecology ◽  
2017 ◽  
Vol 98 (11) ◽  
pp. 2823-2836 ◽  
Author(s):  
Ronald D. Bassar ◽  
Joseph Travis ◽  
Tim Coulson
Keyword(s):  
Ontogenetic Niche Shifts ◽  
Niche Shifts ◽  
Ontogenetic Niche

scholarly journals Predation and associational refuge drive ontogenetic niche shifts in an arctiid caterpillar

Ecology ◽  
2015 ◽  
Vol 96 (1) ◽  
pp. 80-89 ◽  
Author(s):  
Patrick Grof-Tisza ◽  
Marcel Holyoak ◽  
Edward Antell ◽  
Richard Karban
Keyword(s):  
Ontogenetic Niche Shifts ◽  
Niche Shifts ◽  
Ontogenetic Niche ◽  
Associational Refuge

Ontogenetic Niche Shifts, Predators, and Coexistence among Consumer Species

2013 ◽  
Author(s):  
André M. de Roos ◽  
Lennart Persson
Keyword(s):  
Alternative Stable States ◽  
Niche Partitioning ◽  
Stage Structure ◽  
Stable States ◽  
Stable Coexistence ◽  
Ontogenetic Niche Shifts ◽  
Niche Shifts ◽  
Ontogenetic Niche ◽  
Dependent Growth ◽  
Equal Population

This chapter considers how stage structure and ontogenetic niche shifts may affect the coexistence between two consumer species competing for two resources in the absence and presence of predators, and how ontogenetic niche shifts may give rise to alternative stable states. More specifically, the analysis will use techniques developed within the consumer-resource framework of Tilman (1982), including consumption and renewal vectors (Schellekens, de Roos, and Persson 2010). Tilman showed that stable coexistence between consumers feeding on the same two resources is possible if each consumer species feeds proportionally more on the resource that limits its own growth most. Stable coexistence is, however, also affected by the form of resource-dependent growth isoclines, which represent combinations of resource densities that lead to equal population growth of consumers. It is shown that ontogenetic niche shifts per se affect the form of resource-dependent growth isoclines, which in turn may lead to coexistence through niche partitioning. The chapter also discusses how predation may promote the performance of a species undergoing ontogenetic niche shifts even in the case where it is both the inferior competitor and the preferred prey of the predator.

Summary

2013 ◽  
Author(s):  
André M. de Roos ◽  
Lennart Persson
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
General Framework ◽  
Community Effects ◽  
Present Volume ◽  
Ontogenetic Niche Shifts ◽  
Niche Shifts ◽  
Different Types ◽  
Emergent Community ◽  
Ontogenetic Niche

This chapter provides a summary of the topics covered by the present volume. The summary serves the purpose of clearly showing how different chapters fit together in a general framework with respect to model approaches as well as results obtained. Reading this summary chapter will show readers the different types of community modules that will be analyzed as well as provide a clear impression of the results and insights that presented in this book. Topics discussed include biomass overcompensation, ontogenetic (a)symmetry in energetics, emergent community effects of biomass overcompensation, ontogenetic niche shifts in consumer life history, ontogenetic niche shifts in predator life history, competition between consumers with and without ontogenetic niche shifts, and ontogenetic (a)symmetry in energetics and population dynamics.

scholarly journals Prey size of salmonid fishes in streams, lakes, and oceans

2001 ◽  
Vol 58 (6) ◽  
pp. 1122-1132 ◽  
Author(s):  
Ernest R Keeley ◽  
James WA Grant
Keyword(s):  
Growth Rate ◽  
Prey Size ◽  
Growth Potential ◽  
Salmonid Fishes ◽  
Ontogenetic Niche Shifts ◽  
Niche Shifts ◽  
Ontogenetic Niche ◽  
The Difference

The growth rate of salmonid fishes is typically fastest in oceans, intermediate in lakes, and slowest in streams. We compiled literature data to test whether differences in the size of prey eaten by salmonids in the three habitats could account for these differences in growth rate (i.e., the prey-size hypothesis). In all three habitats, salmonid fishes exhibited ontogenetic niche shifts from feeding primarily on invertebrates when small to feeding on fishes when large. Contrary to the prey-size hypothesis, invertebrates eaten in streams were larger than those eaten in lakes or oceans, whereas fish eaten in oceans were smaller than those eaten in streams or lakes. Consistent with the prey-size hypothesis, salmonids began eating fish at a smaller size in oceans (8 cm) than in lakes (15 cm) or streams (27 cm). However, the size at which salmonids became predominantly piscivorous (31 cm) did not differ significantly between habitats. We suggest that the difference in growth potential between the three habitats is partly related to the size at which fish first enter the diet.

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