Foraging tactics of a terrestrial salamander

Costs of territorial defence

Robert G. Jaeger, Kiisa C Nishikawa, Debra E. Barnard

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Red-backed salamanders, Plethodon cinereus, established territories in laboratory chambers. Their foraging tactics, on two types of prey differing in caloric profitability and defence behaviour, were observed under a series of experimental conditions in which competitive threat was increased: no competitor present < familiar conspecific's pheromones present < unfamiliar conspecific's pheromones present < familiar conspecific intruder present < unfamiliar conspecific intruder present. As the degree of competitive threat increased, more time was devoted to territorial defence (displays and biting) at the expense of foraging. Simultaneously, the territorial residents gradually shifted from a specialized diet on the more profitable prey type to an indiscriminate diet, even though prey densities and the residents' encounter rates with each prey did not change. The presence of unfamiliar pheromones and both intruders led to approximately a 50% decrease in the residents' rates of net energy gain, about 80% of which was due to the time withdrawn from foraging and 20% due to change in diet. Changes in foraging time and diet both reflected the costs of territorial defence.

Original languageEnglish (US)
Pages (from-to)191-198
Number of pages8
JournalAnimal Behaviour
Volume31
Issue number1
DOIs
StatePublished - 1983
Externally publishedYes

Fingerprint

salamanders and newts
pheromone
foraging
pheromones
Plethodon cinereus
diet
cost
defense behavior
encounter rate
profitability
defence
salamander
energy

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Foraging tactics of a terrestrial salamander : Costs of territorial defence. / Jaeger, Robert G.; Nishikawa, Kiisa C; Barnard, Debra E.

In: Animal Behaviour, Vol. 31, No. 1, 1983, p. 191-198.

Research output: Contribution to journalArticle

Jaeger, Robert G. ; Nishikawa, Kiisa C ; Barnard, Debra E. / Foraging tactics of a terrestrial salamander : Costs of territorial defence. In: Animal Behaviour. 1983 ; Vol. 31, No. 1. pp. 191-198.
@article{894d07edad70471293cf287454ee7be8,
title = "Foraging tactics of a terrestrial salamander: Costs of territorial defence",
abstract = "Red-backed salamanders, Plethodon cinereus, established territories in laboratory chambers. Their foraging tactics, on two types of prey differing in caloric profitability and defence behaviour, were observed under a series of experimental conditions in which competitive threat was increased: no competitor present < familiar conspecific's pheromones present < unfamiliar conspecific's pheromones present < familiar conspecific intruder present < unfamiliar conspecific intruder present. As the degree of competitive threat increased, more time was devoted to territorial defence (displays and biting) at the expense of foraging. Simultaneously, the territorial residents gradually shifted from a specialized diet on the more profitable prey type to an indiscriminate diet, even though prey densities and the residents' encounter rates with each prey did not change. The presence of unfamiliar pheromones and both intruders led to approximately a 50{\%} decrease in the residents' rates of net energy gain, about 80{\%} of which was due to the time withdrawn from foraging and 20{\%} due to change in diet. Changes in foraging time and diet both reflected the costs of territorial defence.",
author = "Jaeger, {Robert G.} and Nishikawa, {Kiisa C} and Barnard, {Debra E.}",
year = "1983",
doi = "10.1016/S0003-3472(83)80188-2",
language = "English (US)",
volume = "31",
pages = "191--198",
journal = "Animal Behaviour",
issn = "0003-3472",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Foraging tactics of a terrestrial salamander

T2 - Costs of territorial defence

AU - Jaeger, Robert G.

AU - Nishikawa, Kiisa C

AU - Barnard, Debra E.

PY - 1983

Y1 - 1983

N2 - Red-backed salamanders, Plethodon cinereus, established territories in laboratory chambers. Their foraging tactics, on two types of prey differing in caloric profitability and defence behaviour, were observed under a series of experimental conditions in which competitive threat was increased: no competitor present < familiar conspecific's pheromones present < unfamiliar conspecific's pheromones present < familiar conspecific intruder present < unfamiliar conspecific intruder present. As the degree of competitive threat increased, more time was devoted to territorial defence (displays and biting) at the expense of foraging. Simultaneously, the territorial residents gradually shifted from a specialized diet on the more profitable prey type to an indiscriminate diet, even though prey densities and the residents' encounter rates with each prey did not change. The presence of unfamiliar pheromones and both intruders led to approximately a 50% decrease in the residents' rates of net energy gain, about 80% of which was due to the time withdrawn from foraging and 20% due to change in diet. Changes in foraging time and diet both reflected the costs of territorial defence.

AB - Red-backed salamanders, Plethodon cinereus, established territories in laboratory chambers. Their foraging tactics, on two types of prey differing in caloric profitability and defence behaviour, were observed under a series of experimental conditions in which competitive threat was increased: no competitor present < familiar conspecific's pheromones present < unfamiliar conspecific's pheromones present < familiar conspecific intruder present < unfamiliar conspecific intruder present. As the degree of competitive threat increased, more time was devoted to territorial defence (displays and biting) at the expense of foraging. Simultaneously, the territorial residents gradually shifted from a specialized diet on the more profitable prey type to an indiscriminate diet, even though prey densities and the residents' encounter rates with each prey did not change. The presence of unfamiliar pheromones and both intruders led to approximately a 50% decrease in the residents' rates of net energy gain, about 80% of which was due to the time withdrawn from foraging and 20% due to change in diet. Changes in foraging time and diet both reflected the costs of territorial defence.

UR - http://www.scopus.com/inward/record.url?scp=0001542598&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001542598&partnerID=8YFLogxK

U2 - 10.1016/S0003-3472(83)80188-2

DO - 10.1016/S0003-3472(83)80188-2

M3 - Article

VL - 31

SP - 191

EP - 198

JO - Animal Behaviour

JF - Animal Behaviour

SN - 0003-3472

IS - 1

ER -