Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs

Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs

12 pages, 12 figures, 2 tables

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Main Authors: Morote, Elvira, Olivar, M. Pilar, Pankhurst, Patricia M., Villate, Fernando, Uriarte, Ibon
Format: artículo biblioteca
Language:English
Published: Inter Research 2008-01-17
Subjects:Bullet tuna larvae, Feeding ecology, Prey selection, Ontogeny, Vision, NW Mediterranean,
Online Access:http://hdl.handle.net/10261/17446
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spelling dig-icm-es-10261-174462020-11-19T07:14:22Z Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs Morote, Elvira Olivar, M. Pilar Pankhurst, Patricia M. Villate, Fernando Uriarte, Ibon Bullet tuna larvae Feeding ecology Prey selection Ontogeny Vision NW Mediterranean 12 pages, 12 figures, 2 tables The bullet tuna Auxis rochei, Risso 1810, is a small tuna widely distributed in tropical and temperate Seas. The present study reports on the first attempt to jointly monitor diet and food selection in larvae of this species and to assess the influence of the ontogenetic development of feeding-related organs on the diet. A. rochei larvae from 2 to 7 mm long are diurnal feeders and highly active predators, with high values of feeding incidence, gut fullness and number of ingested prey items. The rate of change in prey item size in relation to larval size was higher than in other species. Only small, non-motile prey items are eaten at the onset of feeding. Rapid mouth development and the early appearance of teeth allow larvae from 3 to 5 mm long to ingest a wide range of prey. However, niche breadth decreases at 5 mm, when larvae avoid small prey items in favour of larger ones with a higher carbon content. Chesson’s selectivity index indicated that small larvae (from 2 to 3 mm long) selected a variety of small prey items, mainly copepod nauplii. Larvae measuring 3 to 5 mm selectively ate cladocerans and appendicularians, and larvae with lengths ≥5 mm preferred appendicularians and fish larvae. Precocious body development (mouth, teeth, and onset of stomach and caudal fin development) and improved visual acuity(larger lens diameter and angular cone density) are factors that contribute to the feeding success of larvae of this species This research was funded by the CTM2004-03510-C02-01/MAR Project. E.M. acknowledges predoctoral FPI Fellowship support from Spain’s Ministry of Education and Science. P.M.P. was supported by a James Cook University Aquaculture and Emerging Species Research Advancement Program Grant Peer reviewed 2009-10-05T12:08:06Z 2009-10-05T12:08:06Z 2008-01-17 artículo http://purl.org/coar/resource_type/c_6501 Marine Ecology Progress Series 353: 243-254 (2008) 0171-8630 http://hdl.handle.net/10261/17446 10.3354/meps07206 1616-1599 en https://doi.org/10.3354/meps07206 open 3016421 bytes application/pdf Inter Research
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Bullet tuna larvae
Feeding ecology
Prey selection
Ontogeny
Vision
NW Mediterranean
Bullet tuna larvae
Feeding ecology
Prey selection
Ontogeny
Vision
NW Mediterranean
spellingShingle Bullet tuna larvae
Feeding ecology
Prey selection
Ontogeny
Vision
NW Mediterranean
Bullet tuna larvae
Feeding ecology
Prey selection
Ontogeny
Vision
NW Mediterranean
Morote, Elvira
Olivar, M. Pilar
Pankhurst, Patricia M.
Villate, Fernando
Uriarte, Ibon
Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs
description 12 pages, 12 figures, 2 tables
format artículo
topic_facet Bullet tuna larvae
Feeding ecology
Prey selection
Ontogeny
Vision
NW Mediterranean
author Morote, Elvira
Olivar, M. Pilar
Pankhurst, Patricia M.
Villate, Fernando
Uriarte, Ibon
author_facet Morote, Elvira
Olivar, M. Pilar
Pankhurst, Patricia M.
Villate, Fernando
Uriarte, Ibon
author_sort Morote, Elvira
title Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs
title_short Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs
title_full Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs
title_fullStr Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs
title_full_unstemmed Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs
title_sort trophic ecology of bullet tuna auxis rochei larvae and ontogeny of feeding-related organs
publisher Inter Research
publishDate 2008-01-17
url http://hdl.handle.net/10261/17446
work_keys_str_mv AT moroteelvira trophicecologyofbullettunaauxisrocheilarvaeandontogenyoffeedingrelatedorgans
AT olivarmpilar trophicecologyofbullettunaauxisrocheilarvaeandontogenyoffeedingrelatedorgans
AT pankhurstpatriciam trophicecologyofbullettunaauxisrocheilarvaeandontogenyoffeedingrelatedorgans
AT villatefernando trophicecologyofbullettunaauxisrocheilarvaeandontogenyoffeedingrelatedorgans
AT uriarteibon trophicecologyofbullettunaauxisrocheilarvaeandontogenyoffeedingrelatedorgans
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