Diel Variation of Visual Response in Talitrus saltator and Talorchestia deshayesii (Crustacea: Amphipoda) from High Latitude Beaches of Low Tidal Amplitude

Nardi, M.; Persson, Lars-Eric; Scapini, Felicita

doi:10.1006/ecss.1999.0571

Cited by 12 publications

(7 citation statements)

References 22 publications

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“…Environmental factors and variables had different weights in the best models obtained for the 2 beaches, and the intrinsic 'sex' variable affected the behaviour of sandhoppers on the reflective beach only. Scototactic responses were in agreement with those observed for sandhoppers from microtidal beaches of the Mediterranean (Scapini 1997) and the Baltic Sea (Nardi et al 2000). However, the higher scatter observed in scototaxis on the reflective beach with respect to the dissipative one could be attributed to different strategies (e.g.…”

Section: Discussionsupporting

confidence: 85%

Testing the Habitat Safety Hypothesis with behavioural field experiments: amphipod orientation on sandy beaches with contrasting morphodynamics

Fanini¹,

Defeo²,

Santos³

et al. 2009

Mar. Ecol. Prog. Ser.

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Section: Discussionsupporting

confidence: 85%

Testing the Habitat Safety Hypothesis with behavioural field experiments: amphipod orientation on sandy beaches with contrasting morphodynamics

Fanini¹,

Defeo²,

Santos³

et al. 2009

Mar. Ecol. Prog. Ser.

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“…This was based on the nighttime active phase of the locomotor rhythm in T. longicornis (Forward et al, 2009a) and on evidence that phototactic behavior in talitrids increases in magnitude during the night phase (Nardi et al, 2000). At the photoreceptor level, visual sensitivity, as indicated by log K measurements from electrophysiological VlogI curves, and temporal resolution did not change between day and night for either photoreceptor spectral class, suggesting that visual sensitivity at the retinal level is the same during day and night.…”

Section: Discussionmentioning

confidence: 99%

“…In conjunction with overall activity, visual orientation in response to local cues (e.g. phototaxis and scototaxis) has been shown to vary over the diel cycle, although species, populations and life-history stages differ in the way these responses change over the diel cycle (Mezzetti et al, 1997;Nardi et al, 2000). Although extraretinal photoreception has been reported in talitrids, photoreceptors in the eyes are required for entrainment of activity rhythms and, presumably, for local and celestial orientation as well (Frelon-Raimond et al, 2002;Forward et al, 2009a;Forward et al, 2009b).…”

Section: Introductionmentioning

confidence: 99%

Visual physiology underlying orientation and diel behavior in the sand beach amphipod Talorchestia longicornis

Cohen

Cronin

Lessios

et al. 2010

Journal of Experimental Biology

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SUMMARYTalitrid amphipods employ vision for zonal recovery behaviors on sand beaches and for entraining circadian activity rhythms. Using a hierarchy of methods, we examined visual spectral and response-intensity functions in Talorchestia longicornis, a species in which orientation and rhythm entrainment are wavelength-specific behaviors. Microspectrophotometry, electroretinogram recording and behavioral assays were used to determine visual pigments, retinal spectral sensitivity and wholeanimal spectral responsivity, respectively. Diel changes in absolute sensitivity were also investigated at retinal and whole-animal levels. Two receptor spectral classes were identified, with values for visual pigment  max of 427 and 518nm. Retinal spectral sensitivity varied with electrode position along the distal-proximal axis. Chromatic adaptation of distal and proximal photoreceptors resulted in sensitivity peaks at 430 and 522nm, respectively. In accordance with identified visual pigments and spectral sensitivity, T. longicornis photobehavioral responsivity covered a broad range (420-580nm). Collectively, a dualpigment visual system underlies wavelength-specific behavior in T. longicornis, with the short-wavelength pigment likely to be localized in the distal R5 retinular cell. While response-intensity functions did not change over the diel cycle at the retinal level, behavioral photoresponsiveness varied between day and night. At a wavelength used by T. longicornis for celestial orientation (420nm), photobehavior was heightened at night, potentially aiding in nocturnal orientation. By contrast, at a wavelength used to entrain its circadian rhythm (520nm) and for routine visual tasks, photobehavior was heightened during the day, and spectral sensitivity matched to the twilight spectrum, facilitating crepuscular vision and entrainment by irradiance at sunrise and sunset.

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“…The type species, Talitrus saltator (Montagu, 1808), has been an important model animal in these studies, and several authors have pointed out its capability to employ different adaptive strategies to local environmental conditions (Williams 1983, Scapini 1997, Fallaci et al 1999, Nardi et al 2000. The beaches on which it occurs are naturally changing environments, subjected to different natural pressures, both solar and lunar day phenomena may be influential, and rhythms of locomotor activity in phase with the gravimetric tides are commonly reported (Rossano et al 2008).…”

Section: Introductionmentioning

confidence: 97%

Locomotor rhythm phenology ofTalitrus saltatorfrom two geomorphologically different beaches of Tunisia: Bizerte (North of Tunisia) and Gulf of Gabes (South of Tunisia)

Ayari

Nasri–Ammar

2012

Biological Rhythm Research

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Locomotor activity of the supra-littoral amphipod Talitrus saltator was studied in spring and autumn. Specimens were collected from two geomorphologically different beaches: Bizerte, in the North of Tunisia and the Gulf of Gabes in the South of Tunisia. The latter has the largest tidal amplitude in the Mediterranean basin. Adult individuals were collected by hand and transferred individually to actographs, equipped with an infrared recording system. These were placed in a controlled environment cabinet, where locomotor activity was monitored over a period of 16 days. The resulting endogenous rhythms of locomotor activity showed unimodal circadian and bimodal periods in amphipods from both Bizerte and Gulf of Gabes beaches. In spring, the unimodal activity pattern predominated at Gabes beach, whereas different patterns of activity (unimodal, bimodal, and plurimodal) were obtained among Bizerte population, with almost equal proportions. Highly significant differences between ultradian and circadian rhythmicities were revealed in both Bizerte and Gabes populations. These results are interpreted in the context of locomotor rhythm adaptation to the geomorphological conditions prevailing at the two collection sites.

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Diel Variation of Visual Response in Talitrus saltator and Talorchestia deshayesii (Crustacea: Amphipoda) from High Latitude Beaches of Low Tidal Amplitude

Cited by 12 publications

References 22 publications

Testing the Habitat Safety Hypothesis with behavioural field experiments: amphipod orientation on sandy beaches with contrasting morphodynamics

Testing the Habitat Safety Hypothesis with behavioural field experiments: amphipod orientation on sandy beaches with contrasting morphodynamics

Visual physiology underlying orientation and diel behavior in the sand beach amphipod Talorchestia longicornis

Locomotor rhythm phenology ofTalitrus saltatorfrom two geomorphologically different beaches of Tunisia: Bizerte (North of Tunisia) and Gulf of Gabes (South of Tunisia)

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