Eye morphology and responses to various visual stimuli were comparatively investigated in several populations of three species of talitrid amphipods: Talitrus saltator, Orchestia gammarellus and Talorchestia spinifera from Mediterranean and Atlantic coasts. The responses to a directional artificial light (phototaxis) and to a black boundary (scototaxis) appeared tuned to orient talitrids downshore or, alternatively, to shelters according to their activity phase. In addition, Mediterranean T. saltator showed a peak of spectral sensitivity to blue light, the most abundant wavelength in the sky over the sea (450 nm), and this appears to be an effective means to orient seaward. In T. spinifera the arrangement of a particular vesicular structure in the lenses of the ommatidia appears suited to amplify the perception of horizontal light reflection on the sea surface, thus achieving a similar orienting device on an anatomical rather than physiological basis as exhibited by T. saltator. In summary, the compound eyes of talitrid amphipods have a common basic structure, but show a variety of morphological and/or physiological features, each suited to optimize vision under different optical conditions and to adapt the animals to the environments they inhabit and behaviours they express.

Visual ecology of talitrid amphipods from Mediterranean and Atlantic coasts / M.C. Mezzetti; S. Gambineri; C. Rossano; F. Scapini. - In: ZOOLÓGICA BAETICA. - ISSN 1130-4251. - STAMPA. - 21(2010), pp. 55-63.

Visual ecology of talitrid amphipods from Mediterranean and Atlantic coasts

GAMBINERI, SIMONE;ROSSANO, CLAUDIA;SCAPINI, FELICITA
2010

Abstract

Eye morphology and responses to various visual stimuli were comparatively investigated in several populations of three species of talitrid amphipods: Talitrus saltator, Orchestia gammarellus and Talorchestia spinifera from Mediterranean and Atlantic coasts. The responses to a directional artificial light (phototaxis) and to a black boundary (scototaxis) appeared tuned to orient talitrids downshore or, alternatively, to shelters according to their activity phase. In addition, Mediterranean T. saltator showed a peak of spectral sensitivity to blue light, the most abundant wavelength in the sky over the sea (450 nm), and this appears to be an effective means to orient seaward. In T. spinifera the arrangement of a particular vesicular structure in the lenses of the ommatidia appears suited to amplify the perception of horizontal light reflection on the sea surface, thus achieving a similar orienting device on an anatomical rather than physiological basis as exhibited by T. saltator. In summary, the compound eyes of talitrid amphipods have a common basic structure, but show a variety of morphological and/or physiological features, each suited to optimize vision under different optical conditions and to adapt the animals to the environments they inhabit and behaviours they express.
21
55
63
M.C. Mezzetti; S. Gambineri; C. Rossano; F. Scapini
File in questo prodotto:
File Dimensione Formato  
Zoo-5%20Mezzetti.pdf

Accesso chiuso

Tipologia: Versione finale referata (Postprint, Accepted manuscript)
Licenza: DRM non definito
Dimensione 250.39 kB
Formato Adobe PDF
250.39 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/404057
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact