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The onset in spring and the end in autumn of the thermal and vegetative growing season affect calving time and reproductive success in reindeer.

Author(s): Paoli A, Weladji RB, Holand Ø, Kumpula J

Curr Zool. 2020 Apr;66(2):123-134 Authors: Paoli A, Weladji RB, Holand Ø, Kumpula J

Article GUID: 32440272
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
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]