Prey Size and Survivorship in Didinium nasutum (Ciliophora: Gymnostomatida)

1987 ◽  
Vol 106 (2) ◽  
pp. 134 ◽  
Author(s):  
Steven W. Hewett
Keyword(s):  
Prey Size

scholarly journals Prey Size Decline as a Unifying Ecological Selecting Agent in Pleistocene Human Evolution

Quaternary ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 7
Author(s):  
Miki Ben-Dor ◽  
Ran Barkai
Keyword(s):  
Prey Size ◽  
Prey Availability ◽  
Stone Tool ◽  
Foraging Efficiency ◽  
Energetic Cost ◽  
Large Prey ◽  
Biomass Density ◽  
Cultural Changes ◽  
Progressive Decline ◽  
Brain Expansion

We hypothesize that megafauna extinctions throughout the Pleistocene, that led to a progressive decline in large prey availability, were a primary selecting agent in key evolutionary and cultural changes in human prehistory. The Pleistocene human past is characterized by a series of transformations that include the evolution of new physiological traits and the adoption, assimilation, and replacement of cultural and behavioral patterns. Some changes, such as brain expansion, use of fire, developments in stone-tool technologies, or the scale of resource intensification, were uncharacteristically progressive. We previously hypothesized that humans specialized in acquiring large prey because of their higher foraging efficiency, high biomass density, higher fat content, and the use of less complex tools for their acquisition. Here, we argue that the need to mitigate the additional energetic cost of acquiring progressively smaller prey may have been an ecological selecting agent in fundamental adaptive modes demonstrated in the Paleolithic archaeological record. We describe several potential associations between prey size decline and specific evolutionary and cultural changes that might have been driven by the need to adapt to increased energetic demands while hunting and processing smaller and smaller game.

Does prey abundance affect prey size selection by the Eagle Owl (Bubo bubo)?

2021 ◽  
Author(s):  
Jorge Tobajas ◽  
Carlos Rouco ◽  
Javier Fernandez-de-Simon ◽  
Francisco Díaz-Ruiz ◽  
Francisca Castro ◽  
...  
Keyword(s):  
Prey Size ◽  
Prey Abundance ◽  
Bubo Bubo ◽  
Size Selection ◽  
Eagle Owl

Does prey size induce head skeleton phenotypic plasticity during early ontogeny in the snake Boa constrictor ?

2005 ◽  
Vol 267 (04) ◽  
pp. 363 ◽  
Author(s):  
Gordon W. Schuett ◽  
David L. Hardy ◽  
Ryan L. Earley ◽  
Harry W. Greene
Keyword(s):  
Phenotypic Plasticity ◽  
Prey Size ◽  
Early Ontogeny ◽  
Boa Constrictor ◽  
Head Skeleton

scholarly journals Changes in foraging mode caused by a decline in prey size have major bioenergetic consequences for a small pelagic fish

2021 ◽  
Author(s):  
Elisa Thoral ◽  
Quentin Queiros ◽  
Damien Roussel ◽  
Gilbert Dutto ◽  
Eric Gasset ◽  
...  
Keyword(s):  
Prey Size ◽  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Foraging Mode

Prey size increases with nestling age: are provisioning parents programmed or responding to cues from offspring?

2014 ◽  
Vol 68 (5) ◽  
pp. 711-719 ◽  
Author(s):  
Karen L. Wiebe ◽  
Tore Slagsvold
Keyword(s):  
Prey Size

Trends in the prey size-based trophic niches of feral and House Cats Felis catus L.

Mammal Review ◽  
1998 ◽  
Vol 28 (3) ◽  
pp. 125-139 ◽  
Author(s):  
Pearre ◽  
Maass
Keyword(s):  
Prey Size ◽  
Felis Catus ◽  
Trophic Niches

Handling times, prey size and species selection by Cancer novaezelandiae (Jacquinot, 1853) feeding on molluscan prey

1990 ◽  
Vol 140 (1-2) ◽  
pp. 13-28 ◽  
Author(s):  
Paul D. Creswell ◽  
Colin L. McLay
Keyword(s):  
Prey Size ◽  
Species Selection

Parasitic Phase of the Sea Lamprey (Petromyzon marinus) in Lake Ontario

1980 ◽  
Vol 37 (11) ◽  
pp. 2021-2038 ◽  
Author(s):  
W. J. Christie ◽  
D. P. Kolenosky
Keyword(s):  
Lake Trout ◽  
Prey Size ◽  
Lake Ontario ◽  
Sea Lamprey ◽  
Error Component ◽  
Species Preference ◽  
Fish Weight ◽  
History Of ◽  
Parasitic Phase ◽  
Parasitic Generation

Sea lamprey produced in other areas of Lake Ontario appeared to be responsible for significant levels of predation on target species of the eastern outlet basin. The life history of the lamprey is simple with only one parasitic generation present in the lake during the feeding period. Wound frequencies on gillnetted whitefish were influenced by season, fish size, gillnet set duration, and a large random error component which suggested a contagious distribution. Scar frequencies were influenced by fish age and indicated improved survival of whitefish when fish weight exceeded lamprey weight by 43 times. Lamprey impact on the whitefish stocks would probably have been more important at lower fishing intensities. The lamprey may have been prey limited, and size and species preference were probably such that lake trout and burbot were not buffered against sea lamprey by white suckers or whitefish. The analysis favored the view that lamprey were innocuous in 19th century Lake Ontario by reason of prey size and density, but climatic and other environmental effects could also have been important.Key words: sea lamprey, lake whitefish, Lake Ontario

As the prey thickens: rainbow trout select prey based upon width not length

2021 ◽  
pp. 1-11
Author(s):  
Michael J. Dodrill ◽  
Charles B. Yackulic ◽  
Theodore A. Kennedy ◽  
Michael D. Yard ◽  
Josh Korman
Keyword(s):  
Rainbow Trout ◽  
Prey Size ◽  
Choice Model ◽  
Prey Selection ◽  
Invertebrate Drift ◽  
Fish Length ◽  
Larval Stages ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Selective Foraging ◽  
Length Width

Drift-feeding fish are typically considered size-selective predators. Yet, few studies have explicitly tested which aspect of prey “size” best explains size selection by drift-foraging fish. Here, we develop a Bayesian discrete choice model to evaluate how attributes of both prey and predator simultaneously influence size-selective foraging. We apply the model to a large dataset of paired invertebrate drift (n = 784) and rainbow trout (Oncorhynchus mykiss) diets (n = 1028). We characterized prey “size” using six metrics (length, width, area, hemispherical area, volume, mass) and used pseudo-R2 to determine which metric best explained observed prey selection across seven taxa. We found that rainbow trout are positively size-selective, they are selecting prey based upon differences in prey width, and size-selectivity increases with fish length. Rainbow trout demonstrated strong selection for the adult and pupae stages of aquatic insects relative to their larval stages. Our study provides strong empirical evidence for size-selective foraging in rainbow trout and demonstrates prey selection is based primarily upon width, not length or area as has been widely reported.

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