Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)

The effect of temperature and photoperiod on molt production in juvenile specimens of the acorn barnacle Austromegabalanus psittacus (Molina, 1782) was evaluated under controlled conditions. Growth was determined both under controlled and natural conditions. The molt frequency, intermolt period and...

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Autores principales:	López,Daniel A, Espinoza,Eduardo A, López,Boris A, Santibañez,Alexis F
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2008
Materias:	Balanidae giant barnacle temperature photoperiod Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000300020
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spelling	oai:scielo:S0718-195720080003000202009-04-09Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)López,Daniel AEspinoza,Eduardo ALópez,Boris ASantibañez,Alexis F Balanidae giant barnacle temperature photoperiod Chile The effect of temperature and photoperiod on molt production in juvenile specimens of the acorn barnacle Austromegabalanus psittacus (Molina, 1782) was evaluated under controlled conditions. Growth was determined both under controlled and natural conditions. The molt frequency, intermolt period and instantaneous growth rates of the carino rostral lengths were measured in specimens subject to two temperature conditions (10ºC and 16ºC) and photoperiods (8 hours light: 16 hours darkness and 16 hours light: 8 hours darkness). Growth of specimens in natural conditions was evaluated in substrates suspended from floating rafts in Metri Bay (41º36'S; 72º43'W) at two depths: between 1 and 2 m and between 4 and 6 m, during the autumn-winter and spring-summer seasons. Molt frequency was greater at 16ºC than at 10ºC, with no evidence of variations due to photoperiod. The intermolt periods were greater at 10ºC than at 16ºC and during the photoperiods 8:16 than at 16:8. Instantaneous growth rates, on the other hand, were greater at 10ºC than at 16ºC and under photoperiod conditions of 8:16 than at 16:8. No relation was observed between instantaneous growth rate and molt frequency. Under natural conditions, a larger increase in length was observed in individuals growing at greater depths. The results obtained in a controlled environment and in the natural environment were consistent, given that the higher growth reported in suspended systems at greater depths, was associated with lower luminosity conditions and lower temperatures; a similar situation was observed under controlled conditions.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.43 n.3 20082008-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000300020en10.4067/S0718-19572008000300020
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Balanidae giant barnacle temperature photoperiod Chile
spellingShingle	Balanidae giant barnacle temperature photoperiod Chile López,Daniel A Espinoza,Eduardo A López,Boris A Santibañez,Alexis F Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)
description	The effect of temperature and photoperiod on molt production in juvenile specimens of the acorn barnacle Austromegabalanus psittacus (Molina, 1782) was evaluated under controlled conditions. Growth was determined both under controlled and natural conditions. The molt frequency, intermolt period and instantaneous growth rates of the carino rostral lengths were measured in specimens subject to two temperature conditions (10ºC and 16ºC) and photoperiods (8 hours light: 16 hours darkness and 16 hours light: 8 hours darkness). Growth of specimens in natural conditions was evaluated in substrates suspended from floating rafts in Metri Bay (41º36'S; 72º43'W) at two depths: between 1 and 2 m and between 4 and 6 m, during the autumn-winter and spring-summer seasons. Molt frequency was greater at 16ºC than at 10ºC, with no evidence of variations due to photoperiod. The intermolt periods were greater at 10ºC than at 16ºC and during the photoperiods 8:16 than at 16:8. Instantaneous growth rates, on the other hand, were greater at 10ºC than at 16ºC and under photoperiod conditions of 8:16 than at 16:8. No relation was observed between instantaneous growth rate and molt frequency. Under natural conditions, a larger increase in length was observed in individuals growing at greater depths. The results obtained in a controlled environment and in the natural environment were consistent, given that the higher growth reported in suspended systems at greater depths, was associated with lower luminosity conditions and lower temperatures; a similar situation was observed under controlled conditions.
author	López,Daniel A Espinoza,Eduardo A López,Boris A Santibañez,Alexis F
author_facet	López,Daniel A Espinoza,Eduardo A López,Boris A Santibañez,Alexis F
author_sort	López,Daniel A
title	Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)
title_short	Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)
title_full	Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)
title_fullStr	Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)
title_full_unstemmed	Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)
title_sort	molting behavior and growth in the giant barnacle austromegabalanus psittacus (molina, 1782)
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000300020
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_version_	1714202276579508224

Molting behavior and growth in the giant barnacle Austromegabalanus psittacus (Molina, 1782)

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