Ontogenetic Diet Shifts Result in Niche Partitioning between Two Consumer Species Irrespective of Competitive Abilities

2010 ◽  
Vol 176 (5) ◽  
pp. 625-637 ◽  
Author(s):  
Tim Schellekens ◽  
André M. de Roos ◽  
Lennart Persson
Keyword(s):  
Niche Partitioning ◽  
Ontogenetic Diet Shifts ◽  
Competitive Abilities ◽  
Diet Shifts

Ontogenetic Niche Shifts

2013 ◽  
Author(s):  
André M. de Roos ◽  
Lennart Persson
Keyword(s):  
Life History ◽  
Extended Model ◽  
Full Model ◽  
Life History Stages ◽  
Ontogenetic Diet Shifts ◽  
Ontogenetic Niche Shifts ◽  
Niche Shifts ◽  
Limited Supply ◽  
Diet Shifts ◽  
Parameter Values

This chapter considers the consequences for community structure of ontogenetic diet shifts that involve the use of different resources in different life history stages, whereby these resources are in limited supply and are hence competed for by all individuals foraging on them. It explores the consequences of ontogenetic diet shifts using stage-structured biomass models that account for two basic resources, a stage-structured consumer population, for which we distinguish between juveniles and adults, and up to two unstructured predator populations. The most extended model is therefore closely related to the model analyzed in Chapter 5, except for the inclusion of an additional basic resource. The equations of the full model are summarized and default parameter values are listed.

scholarly journals A Review of Galaxias (Galaxiidae) Fossils from the Southern Hemisphere

Diversity ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 208
Author(s):  
Uwe Kaulfuss ◽  
Daphne E. Lee ◽  
Jeffrey H. Robinson ◽  
Graham P. Wallis ◽  
Werner W. Schwarzhans
Keyword(s):  
New Zealand ◽  
Southern Hemisphere ◽  
Fossil Record ◽  
New Caledonia ◽  
Adult Fish ◽  
Gut Content ◽  
Ontogenetic Diet Shifts ◽  
Subantarctic Islands ◽  
Diet Shifts

The Galaxiidae is a Southern Hemisphere family of freshwater fish, considered to be of Gondwanan origin based on the current distribution of species in New Zealand, Australia (including Tasmania), New Caledonia, Africa, South America, and on some associated and subantarctic islands. The fossil record of galaxiids is extremely sparse and geographically restricted. The only galaxiid fossils currently known come from several Miocene lakes in southern New Zealand. They include more than 100 articulated fishes, some remarkably preserving soft parts such as eyes and skin, skulls and jaw components, and more than 200 isolated otoliths. Common coprolites and in situ preserved gut content at one site (Foulden Maar) indicate the different diets of larvae and adult fish. These discoveries reveal a diverse Galaxias fauna, the presence of lake-locked populations, ontogenetic diet shifts, and representatives of several non-migratory Galaxias lineages associated with inland streams and lakes. There are at least six Galaxias species based on macrofossils and six separate otolith-based species from varied volcanic and regional lacustrine environments. This diversity points to southern New Zealand as a centre of biodiversity and speciation in Galaxiidae in the early to late Miocene.

Species‐specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems

Oikos ◽  
2019 ◽  
Vol 128 (7) ◽  
pp. 1051-1064 ◽  
Author(s):  
Jonathan C. P. Reum ◽  
Julia L. Blanchard ◽  
Kirstin K. Holsman ◽  
Kerim Aydin ◽  
André E. Punt
Keyword(s):  
Trophic Cascades ◽  
Food Chains ◽  
Ontogenetic Diet Shifts ◽  
Species Specific ◽  
Diet Shifts

Ontogenetic Diet Shifts of Juvenile Chinook Salmon in Nearshore and Offshore Habitats of Puget Sound

2010 ◽  
Vol 139 (3) ◽  
pp. 803-823 ◽  
Author(s):  
Elisabeth J. Duffy ◽  
David A. Beauchamp ◽  
Ruston M. Sweeting ◽  
Richard J. Beamish ◽  
James S. Brennan
Keyword(s):  
Chinook Salmon ◽  
Puget Sound ◽  
Juvenile Chinook Salmon ◽  
Ontogenetic Diet Shifts ◽  
Juvenile Chinook ◽  
Diet Shifts
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