Effects of resource distribution on the cost of predator avoidance behaviour in tadpoles

Hydrobiologia ◽  
2015 ◽  
Vol 758 (1) ◽  
pp. 99-105 ◽  
Author(s):  
Michael J. Barry
2003 ◽  
Vol 143 (5) ◽  
pp. 845-850 ◽  
Author(s):  
E. Lind�n ◽  
M. Lehtiniemi ◽  
M. Viitasalo

Author(s):  
Andres Uribe-Sanchez ◽  
Alex Savachkin

As recently acknowledged by the Institute of Medicine, the existing pandemic mitigation models lack dynamic decision support capabilities. This paper develops a simulation optimization model for generating dynamic resource distribution strategies over a network of regions exposed to a pandemic. While the underlying simulation mimics the disease and population dynamics of the affected regions, the optimization model generates progressive allocations of mitigation resources, including vaccines, antivirals, healthcare capacities, and social distancing enforcement measures. The model strives to minimize the impact of ongoing outbreaks and the expected impact of the potential outbreaks, considering measures of morbidity, mortality, and social distancing, translated into the cost of lost productivity and medical expenses. The model was implemented on a simulated outbreak involving four million inhabitants. The strategy was compared to pro-rata and myopic strategies. The model is intended to assist public health policy makers in developing effective distribution policies during influenza pandemics.


2015 ◽  
Vol 282 (1820) ◽  
pp. 20151886 ◽  
Author(s):  
Christine N. Bedore ◽  
Stephen M. Kajiura ◽  
Sönke Johnsen

Cephalopods, and in particular the cuttlefish Sepia officinalis , are common models for studies of camouflage and predator avoidance behaviour. Preventing detection by predators is especially important to this group of animals, most of which are soft-bodied, lack physical defences, and are subject to both visually and non-visually mediated detection. Here, we report a novel cryptic mechanism in S. officinalis in which bioelectric cues are reduced via a behavioural freeze response to a predator stimulus. The reduction of bioelectric fields created by the freeze-simulating stimulus resulted in a possible decrease in shark predation risk by reducing detectability. The freeze response may also facilitate other non-visual cryptic mechanisms to lower predation risk from a wide range of predator types.


Primates ◽  
1990 ◽  
Vol 31 (3) ◽  
pp. 323-338 ◽  
Author(s):  
Stephen Francis Ferrari ◽  
Maria Aparecida Lopes Ferrari

1985 ◽  
Vol 63 (9) ◽  
pp. 2001-2005 ◽  
Author(s):  
Joseph A. Brown ◽  
Peter H. Johansen ◽  
Patrick W. Colgan ◽  
R. Alastair Mathers

The effects of pentachlorophenol on the predator-avoidance behaviour of the guppy (Poecilia reticulate) in response to largemouth bass (Micropterus salmoides) predation was investigated. There were no consistent effects of pentachlorophenol on habitat use or general behaviour of the guppies. In the presence of predators, all guppies occurred significantly more often alone, motionless, and in the top third of the water column in the nonopen areas. Nine variables associated with predator efficiency were monitored to determine which treatment groups of guppies were easiest to capture. The bass had significantly lower capture success, performed more strikes and chases, and spent more time chasing guppies from the untreated and 100 μg/L groups than those from the 500 and 700 μg/L groups. This suggests that the guppies from the two high treatment groups had a slower response to predator attack and could not maintain a prolonged escape burst of speed.


2014 ◽  
Vol 502 ◽  
pp. 157-167 ◽  
Author(s):  
PH Manríquez ◽  
ME Jara ◽  
ML Mardones ◽  
R Torres ◽  
JM Navarro ◽  
...  

1993 ◽  
Vol 50 (2) ◽  
pp. 241-246 ◽  
Author(s):  
Robert S. Gregory

The effect of turbidity on the predator avoidance behaviour of juvenile chinook salmon (Oncorhynchus tshawytscha) was determined in controlled laboratory experiments. Bird and fish models were used to simulate predator risk. In the absence of risk, juvenile chinook were distributed randomly within an experimental arena in turbid conditions (≈23 NTU), but in clear conditions (<1 NTU) they associated with the bottom. When introduced to bird and fish predator models, the chinook altered their distribution and occupied deeper parts of the arena regardless of turbidity level. However, their responses in turbid conditions were less marked and of shorter duration. Turbidity apparently reduced the perceived risk of predation in juvenile chinook.


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