Brown trout redd superimposition in relation to spawning habitat availability

Gortázar Rubial, Javier and Alonso González, Carlos and García de Jalón Lastra, Diego (2012). Brown trout redd superimposition in relation to spawning habitat availability. "Ecology of Freshwater Fish" (n. 21); pp. 283-292. ISSN 0906-6691. https://doi.org/10.1111/j.1600-0633.2011.00546.x.

Description

Title: Brown trout redd superimposition in relation to spawning habitat availability
Author/s:
  • Gortázar Rubial, Javier
  • Alonso González, Carlos
  • García de Jalón Lastra, Diego
Item Type: Article
Título de Revista/Publicación: Ecology of Freshwater Fish
Date: 2012
ISSN: 0906-6691
Subjects:
Faculty: E.T.S.I. Montes (UPM)
Department: Ingeniería Forestal [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The relationship between redd superimposition and spawning habitat availability was investigated in the brown trout (Salmo trutta L.) population inhabiting the river Castril (Granada, Spain). Redd surveys were conducted in 24 river sections to estimate the rate of redd superimposition. Used and available microhabitat was evaluated to compute the suitable spawning habitat (SSH) for brown trout. After analysing the microhabitat characteristics positively selected by females, SSH was defined as an area that met all the following five requirements: water depth between 10 and 50 cm, mean water velocity between 30 and 60 cm s)1, bottom water velocity between 15 and 60 cm s)1, substrate size between 4 and 30 mm and no embeddedness. Simple regression analyses showed that redd superimposition was not correlated with redd numbers, SSH or redd density. A simulation-based analysis was performed to estimate the superimposition rate if redds were randomly placed inside the SSH. This analysis revealed that the observed superimposition rate was higher than expected in 23 of 24 instances, this difference being significant (P menor que 0.05) in eight instances and right at the limit of statistical significance (P = 0.05) in another eight instances. Redd superimposition was high in sections with high redd density. High superimposition however was not exclusive to sections with high redd density and was found in moderate- and low-redd-density sections. This suggests that factors other than habitat availability are also responsible for redd superimposition. We argue that female preference for spawning over previously excavated redds may be the most likely explanation for high superimposition at lower densities.

More information

Item ID: 16480
DC Identifier: http://oa.upm.es/16480/
OAI Identifier: oai:oa.upm.es:16480
DOI: 10.1111/j.1600-0633.2011.00546.x
Deposited by: Memoria Investigacion
Deposited on: 10 Mar 2014 11:52
Last Modified: 21 Apr 2016 16:46
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