Effect of teleostean prey size and salinity on satiation amount, satiation time and daily ration in the glassy perchletChanda (=Ambassis) thomassi (Day) (Pisces: Centropomidae)

1982 ◽  
Vol 91 (6) ◽  
pp. 507-513 ◽  
Author(s):  
J Rajasekharan Nair ◽  
N Balakrishnan Nair
Keyword(s):  
Prey Size ◽  
Daily Ration ◽  
Satiation Time

Diel foraging cycles and interactions among juvenile Atlantic cod (Gadus morhua) at a nearshore site in Newfoundland

1998 ◽  
Vol 55 (6) ◽  
pp. 1307-1316 ◽  
Author(s):  
Scott M Grant ◽  
Joseph A Brown
Keyword(s):  
Resource Use ◽  
Zostera Marina ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Prey Size ◽  
Foraging Activity ◽  
Daily Ration ◽  
Behavioural Responses ◽  
In The Wild ◽  
Activity Cycles

In coastal Newfoundland, age 0 Atlantic cod (Gadus morhua) settle in shallow, nearshore regions occupied by older conspecifics. Although intercohort cannibalism is common, little is known of the behavioural responses that limit interactions among juvenile cohorts in the wild. We examined the day-night differences in catch and diet of age 0 and age 1 cod to delineate peak foraging activity and resource use in eelgrass (Zostera marina) habitat. Cod exhibited a size-related shift (age 0 to age 1) from feeding predominantly on zooplankton by day to benthos at night. Intercohort cannibalism occurred when age 1 cod were approximately three times larger than their prey. Concentrations of age 0 cod foraged in the water column during the day, ceased feeding at night, and appeared to disperse to the bottom. Seasonally decreasing daylength and prey size contributed to a decline in daily ration, yet age 0 cod still maintained a strict diurnal foraging cycle. The nocturnal decrease in feeding coincided with an increase in the catch of older conspecifics (age 2 and age 3) and increased foraging activity of age 1 cod, suggesting that avoidance of older conspecifics is an important factor influencing the diel foraging and activity cycles of age 0 cod.

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

Using daily ration models and stable isotope analysis to predict biomass depletion by herbivores

2006 ◽  
Vol 43 (5) ◽  
pp. 1022-1030 ◽  
Author(s):  
RICHARD INGER ◽  
GRAEME D. RUXTON ◽  
JASON NEWTON ◽  
KENDREW COLHOUN ◽  
KERRY MACKIE ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Daily Ration

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
Sign in / Sign up

Export Citation Format

Share Document