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Early-life and parental predation risk shape fear acquisition in adult minnows.

Author(s): Crane AL, Meuthen D, Thapa H, Ferrari MCO, Brown GE

Exposure to predation risk can induce a fearful baseline state, as well as fear reactions toward novel situations (i.e., neophobia). Some research indicates that risk exposure during sensitive periods makes adults more prone to acquiring long-term fearful p...

Article GUID: 33125574
Exploring the threat-sensitive predator avoidance hypothesis on mate competition in two wild populations of Trinidadian guppies.

Author(s): Chuard PJC, Grant JWA, Ramnarine IW, Brown GE

The intensity of mate competition is often influenced by predation pressure. The threat-sensitive predator avoidance hypothesis predicts that prey should precisely adjust their fitness-related activities to the level of perceived acute predation risk and th...

Article GUID: 32860863
The propensity for re-triggered predation fear in a prey fish.

Author(s): Crane AL, Feyten LEA, Ramnarine IW, Brown GE

Sci Rep. 2020 Jun 09;10(1):9253 Authors: Crane AL, Feyten LEA, Ramnarine IW, Brown GE

Article GUID: 32518253
Short-term Captivity Drives Hypothalamic Plasticity and Asymmetry in Wild-Caught Northern Red Bellied Dace (Chrosomus eos).

Author(s): Joyce BJ, Brown GE

J Fish Biol. 2020 May 23;: Authors: Joyce BJ, Brown GE

Article GUID: 32447778
Sender and receiver experience alters the response of fish to disturbance cues.

Author(s): Goldman JA, Feyten LEA, Ramnarine IW, Brown GE

Curr Zool. 2020 Jun;66(3):255-261 Authors: Goldman JA, Feyten LEA, Ramnarine IW, Brown GE

Article GUID: 32440286
High-risk environments promote chemical disturbance signalling among socially familiar Trinidadian guppies.

Author(s): Crane AL, Feyten LEA, Ramnarine IW, Brown GE

Oecologia. 2020 Apr 15;: Authors: Crane AL, Feyten LEA, Ramnarine IW, Brown GE

Article GUID: 32296954
An ecological framework of neophobia: from cells to organisms to populations.

Author(s): Crane AL, Brown GE, Chivers DP, Ferrari MCO

Biol Rev Camb Philos Soc. 2019 Oct 10;: Authors: Crane AL, Brown GE, Chivers DP, Ferrari MCO

Article GUID: 31599483
Competition for food in 2 populations of a wild-caught fish.

Author(s): Chuard PJC, Brown GE, Grant JWA

Curr Zool. 2018 Oct;64(5):615-622 Authors: Chuard PJC, Brown GE, Grant JWA

Article GUID: 30323840
Predation risk assessment based on uncertain information: interacting effects of known and unknown cues.

Author(s): Feyten LEA, Demers EEM, Ramnarine IW, Brown GE

Curr Zool. 2019 Feb;65(1):75-76 Authors: Feyten LEA, Demers EEM, Ramnarine IW, Brown GE PMID: 30697241 [PubMed]

Article GUID: 30697241
Title:Competition for food in 2 populations of a wild-caught fish.
Authors:Chuard PJC,  Brown GE,  Grant JWA
Link:https://www.ncbi.nlm.nih.gov/pubmed/30323840?dopt=Abstract
DOI:10.1093/cz/zox078
Category:Curr Zool
PMID:30323840
Dept Affiliation: BIOLOGY
1 Research School of Biology, The Australian National University, Canberra ACT 0200, Australia.
2 Department of Biology, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, Canada H4B 1R6.

Description:

Competition for food in 2 populations of a wild-caught fish.

Curr Zool. 2018 Oct;64(5):615-622

Authors: Chuard PJC, Brown GE, Grant JWA

Abstract

Aggressive behavior when competing for resources is expected to increase as the ratio of competitors-to-resource ratio (CRR) units increases. Females are expected to be more aggressive than males when competing for food when body size is more strongly related to reproductive success in females than in males, whereas aggression is predicted to decrease under high ambient predation risk by natural selection. Under the risk allocation model, however, individuals under high ambient predation risk are expected to be more aggressive, and forage more in the absence of imminent risk than their low risk counterparts. An interaction between adult sex ratio (i.e., adult males/females), ambient predation risk (high vs. low), and sex on intrasexual competition for mates in Trinidadian guppies Poecilia reticulata has been shown. The interaction suggested an increase in aggression rates as CRR increased, except for males from the high predation population. To compare the patterns of competition for food versus mates, we replicated this study by using food patches. We allowed 4 male or 4 female guppies from high and low predation populations to compete for 5, 3, or 1 food patches. The foraging rate was higher in a high rather than low ambient predation risk population. Surprisingly, CRR, sex, and population of origin had no effect on aggression rates. Despite other environmental differences between the 2 populations, the effect of ambient predation risk may be a likely explanation for differences in foraging rates. These results highlight the importance for individuals to secure food despite the cost of competition and predation.

PMID: 30323840 [PubMed]