Plasticity in feeding selectivity and trophic structure of kelp forest associated fishes from northern Chile

Alejandro Pérez-Matus, Shirley Pledger, Francisco J. Díaz, Lara Ferry, Julio A. Vásquez

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

One of the primary ways in which species interact with their environment is through foraging; thereby directly consuming some fraction of their surrounding habitat. The habitat itself, in turn, may dictate the types of foraging opportunities that are available to the inhabitants. To investigate the relationship between habitat availability and diet composition of habitat-associated fishes, we estimated the relative abundance of the potential sessile and mobile prey items and the diet of the fish species assemblage associated to kelp forest. Specifically, diet and feeding selectivity of the kelp-forest associated fish assemblage were determined by calculating Manly's alpha selectivity index. We determined the diet of kelp forest associated fishes and their foraging behavior by comparing prey availability with those items present in the stomachs of fishes captured by gill net and spear gun. We calculated the degree of dietary overlap among fishes from four locations along the northern coast of Chile. Results indicate that utilization of prey by predators is predominantly affected by potential prey availability. With the exception of the two carnivorous species such as Pinguipes chilensis (Valenciennes, 1883) and Paralabrax humeralis (Cuvier & Valenciennes, 1828), whose diet did not change among sites, all other kelp-associated fishes changed their dietary habitats to consistent with the availability of local resources. Benthic resources changed among the different study sites, which led to differing diets even in the same species from different locations. Eleven of the 12 kelp forest fishes also showed some selectively for benthic prey. We conclude that the ability of fishes to be plastic in their feeding preference and, therefore, partition the benthic resources may set adaptations to co-exist in a dynamic environment such as kelp forest.

Original languageEnglish (US)
Pages (from-to)29-48
Number of pages20
JournalRevista Chilena de Historia Natural
Volume85
Issue number1
DOIs
StatePublished - Mar 2012

Fingerprint

Kelp
kelp forest
trophic structure
Chile
plasticity
macroalgae
Fishes
Ecosystem
fish
Diet
diet
habitats
prey availability
foraging
habitat
resource
Paralabrax
Aptitude
dietary overlap
Forests

Keywords

  • Chile
  • Manly α
  • Predation
  • Trophic guilds
  • Understory

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Environmental Science(all)

Cite this

Plasticity in feeding selectivity and trophic structure of kelp forest associated fishes from northern Chile. / Pérez-Matus, Alejandro; Pledger, Shirley; Díaz, Francisco J.; Ferry, Lara; Vásquez, Julio A.

In: Revista Chilena de Historia Natural, Vol. 85, No. 1, 03.2012, p. 29-48.

Research output: Contribution to journalArticle

Pérez-Matus, Alejandro ; Pledger, Shirley ; Díaz, Francisco J. ; Ferry, Lara ; Vásquez, Julio A. / Plasticity in feeding selectivity and trophic structure of kelp forest associated fishes from northern Chile. In: Revista Chilena de Historia Natural. 2012 ; Vol. 85, No. 1. pp. 29-48.
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