Size-based predation by kookaburras ( Dacelo novaeguineae ) on lizards ( Eulamprus tympanum : Scincidae): what determines prey vulnerability?

2000 ◽  
Vol 48 (6) ◽  
pp. 484-489 ◽  
Author(s):  
S. P. Blomberg ◽  
R. Shine
Keyword(s):  
Prey Vulnerability

Prey vulnerability and predation pressure shape predator-induced changes in O2 consumption and antipredator behaviour

2020 ◽  
Vol 167 ◽  
pp. 13-22
Author(s):  
Simon Karythis ◽  
Tomas O. Cornwell ◽  
Luis Giménez Noya ◽  
Ian D. McCarthy ◽  
Nia M. Whiteley ◽  
...  
Keyword(s):  
Predation Pressure ◽  
Antipredator Behaviour ◽  
O2 Consumption ◽  
Prey Vulnerability ◽  
Induced Changes

Effects of ungulate availability on wolf reproductive potential in Alaska

1992 ◽  
Vol 70 (12) ◽  
pp. 2441-2443 ◽  
Author(s):  
R. D. Boertje ◽  
R. O. Stephenson
Keyword(s):  
Litter Size ◽  
Canis Lupus ◽  
Prey Availability ◽  
Subcutaneous Fat ◽  
Reproductive Potential ◽  
Functional Relationships ◽  
Adult Females ◽  
Prey Vulnerability ◽  
Average Litter Size

We compared wolf (Canis lupus) reproductive data for March and April, when ungulate biomass per wolf was high, moderate, and low. The percentage of reproductively active adult females was significantly lower (66% compared with ≥96%, P < 0.001) when ungulate biomass per wolf was low versus moderate or high. Reproductively inactive adult females had significantly less subcutaneous fat (P < 0.01) than reproductively active females when ungulate biomass per wolf was relatively abundant. Average litter size, estimated by counting blastocysts or fetuses, declined significantly (P < 0.001), from 6.9 to 4.6, as ungulate biomass per wolf declined. We conclude that wolf productivity declines as prey availability per wolf declines. However, only when ungulate biomass per wolf declined below levels previously reported in the literature did we observe significant declines in reproductive potential. Ungulate biomass per wolf was low because of large, rapid declines in ungulates and lesser declines in wolves. We recognize that functional relationships, e.g., prey vulnerability and feeding dominance, can influence wolf productivity independently of ungulate biomass per wolf.

scholarly journals Predator hunting behaviour and prey vulnerability

2004 ◽  
Vol 73 (1) ◽  
pp. 143-154 ◽  
Author(s):  
J. L. Quinn ◽  
Will Cresswell
Keyword(s):  
Hunting Behaviour ◽  
Prey Vulnerability

Effect of Extended Galvanonarcosis on Behavior of Rainbow Trout, Salmo gairdneri, and Channel Catfish, Ictalurus punctatus

1978 ◽  
Vol 35 (10) ◽  
pp. 1297-1302 ◽  
Author(s):  
Kevin D. Curry ◽  
Boyd Kynard
Keyword(s):  
Rainbow Trout ◽  
Key Words ◽  
Fish Species ◽  
Direct Current ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Group Activity ◽  
Salmo Gairdneri ◽  
Prey Vulnerability

Yearling rainbow trout, Salmo gairdneri, and channel catfish, Ictalurus punctatus, were subjected to 0.5- and 3-h periods of narcosis using continuous direct current. Galvanonarcosis treatments decreased the immediate individual and group activity in both species of fish. Twenty-four hours after treatment, all fish except trout narcotized for 3 h recovered to levels of individual and group activity equivalent to those of untreated fish. Photonegative response was strong in both fish species and was not influenced by galvanonarcosis treatments. Trout narcotized with direct current were more vulnerable to predation than untreated fish; susceptability increased with increasing treatment periods. The potential of extended galvanonarcosis as a fish immobilization technique is strong. Key words: galvanonarcosis, behavior, extended narcosis, direct current, rainbow trout, channel catfish, photonegative, activity, prey vulnerability, immobilization

The Effect of Prey Vulnerability: Goshawk Predation and Population Fluctuations of Small Game

Oikos ◽  
1987 ◽  
Vol 49 (2) ◽  
pp. 233 ◽  
Author(s):  
Per Widén ◽  
Henrik Andrén ◽  
Per Angelstam ◽  
Erik Lindström ◽  
Per Widen ◽  
...  
Keyword(s):  
Population Fluctuations ◽  
Small Game ◽  
Prey Vulnerability
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