Solar orientation of adult and laboratory-born juvenile sandhoppers: inter- and intra-population variation

Scapini, Felicita; Porri, Francesca; Borgioli, C.; Martelli, L.

doi:10.1016/s0022-0981(99)00020-9

Cited by 20 publications

(13 citation statements)

References 16 publications

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“…Although the results do not enable us to determine the precise type of visual information that was used, two types of celestial cues appear to be good candidates. One possibility is that juvenile loggerheads possess a time-compensated sun compass, as is present in numerous animals including pigeons (Schmidt-Koenig, 1960;Schmidt-Koenig et al, 1991), freshwater and terrestrial turtles (DeRosa and Taylor, 1980), fish (Hasler et al, 1958;Winn et al, 1964;Levin et al, 1992), and various invertebrates (Mouritsen and Frost, 2002;Scapini et al, 1999;von Frisch, 1967). Alternatively or additionally, turtles might exploit patterns of skylight polarization.…”

Section: Visual Cuesmentioning

confidence: 99%

Use of multiple orientation cues by juvenile loggerhead sea turtlesCaretta caretta

Avens

Lohmann

2003

Journal of Experimental Biology

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SUMMARY Although the orientation cues used by hatchling sea turtles have been studied extensively, little is known about the mechanisms of orientation and navigation that guide older turtles. To investigate the orientation cues used by juvenile loggerheads Caretta caretta L., captured turtles were tethered in a water-filled arena located outdoors. Turtles tested under these conditions established and maintained headings in specific directions in the absence of wave cues, familiar landmarks and chemical gradients. Distorting the magnetic field around the anterior part of a turtle's body did not disrupt orientation if vision remained unimpaired. Similarly, eliminating visual cues by attaching frosted goggles did not disrupt orientation if the magnetic environment was undisturbed. However, when turtles experienced a simultaneous disruption of magnetic and visual cues, their orientation was altered. These results imply that sea turtles, like migratory birds and homing pigeons, are able to maintain headings using multiple sources of directional information.

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Section: Visual Cuesmentioning

confidence: 99%

Use of multiple orientation cues by juvenile loggerhead sea turtlesCaretta caretta

Avens

Lohmann

2003

Journal of Experimental Biology

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“…One exception is from work done on the amphipod Talitrus saltator, which in laboratory trials appeared to consistently orientate in the same direction . Previous experiments had, however, noted variation in the orientation of individuals depending on if they were observed under natural or controlled conditions and so the results of Scapini et al (1999) may not be representative of what occurs in the amphipods' natural environment. Consistency of orientation has also been examined in orb-weaving spiders but only for unmanipulated individuals (Zschokke & Nakata 2010), and it has been noted that such experiments nearly always inherently confound observed results with spatial and temporal variation (Coleman 2010 As the mean number of limpets returning to their original orientation did not differ between treatments, with limpets whose orientation had been flipped neither returning more often than expected to their original nor flipped orientation the following day, it can be concluded that an individual's orientation is independent of their starting orientation.…”

Section: Discussionmentioning

confidence: 91%

Up or down? Limpet orientation on steeply sloped substrata

Fraser¹,

Coleman²,

Klein³

2010

Aquat. Biol.

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Variation in the distribution of animals across the landscape, within and between habitats, can occur at a variety of scales. At the smallest scale, individuals can either be positioned randomly or can be orientated in regard to variables. Differences in orientation can, for many animals, directly affect their reproductive success and/or survivorship, and these effects may have downstream ecological consequences. Organisms may orientate themselves in a specific way in response to varying environmental conditions or habitat properties; alternatively they may consistently orientate in a specific direction. The present study investigated patterns of orientation during low tide in the intertidal marine limpet Cellana tramoserica on steeply sloped rocky surfaces (> 60°to the vertical). We also examined whether individual limpets consistently orientated in the same direction or if orientation was dependent upon their orientation during the previous low tide. There was a downward bias in orientation. Mensurative and manipulative experiments measuring limpet orientation over different days showed that individual limpets did not consistently orientate in the same direction and that their orientation was independent of their orientation during the previous low tide. Thus, whilst limpets on slopes often orientate with their heads downwards, there is much inherent individual variation in the orientation patterns exhibited by resting limpets. Simple mechanistic explanations such as responses to desiccation are unlikely to be sufficient to explain why limpets choose different orientations at the end of foraging excursions. These findings have implications for understanding limpet distributions on rocky shores and downstream ecological consequences.

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“…In sebkhas and oueds, this species was correlated only with edaphic factors (unpublished data). Several studies were focused on the role of environmental factors and showed the influence of factors than others Scapini et al 1995;Scapini and Fasinella 1990;Scapini et al 1999;Scapini and Quochi 1992). Jelassi et al (2012) showed that Talitridae abundance was tightly controlled by air temperature.…”

Section: )mentioning

confidence: 99%

“…This group constitutes one of the dominant macrofaunal groups in sandy beaches (Dahl 1946;McLachlan and Jaramillo 1995). Their ecological relevance has justified worldwide studies, for instance with respect to their behavioral plasticity (Scapini and Fasinella 1990;Scapini et al 1993;Scapini et al 1995), locomotor activity rhythms Morgan 2005, 2006;Ayari and NasriAmmar 2012a, b;Jelassi and Nasri-Ammar 2013;Jelassi et al 2013a, b), the factors influencing their spatial distribution and oriented movements in sandy beach (Scapini and Quochi 1992;Borgioli et al 1999;Scapini et al 1999;Ayari and Nasri-Ammar 2011;Jelassi et al 2012;Jelassi et al 2013c), their behavioral strategies (Fallaci et al 1999), and genetic structure of different populations Bulnheim and Schwenzer 1999). With regard to biodiversity, along the European coasts, talitrid populations have been compared genetically to assess inter-and intraspecific variations .…”

Section: Introductionmentioning

confidence: 99%

Biodiversity of Talitridae family (Crustacea, Amphipoda) in some Tunisian coastal lagoons

et al. 2015

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Background: Although wetlands were remarkable habitats with their fauna and flora diversity, few studies have been devoted to the study of amphipod distribution in this type of environment. To study both qualitatively and quantitatively amphipod community, surveys were conducted during the spring season in ten coastal lagoons ranging from subhumid to arid bioclimatic stage. At each station, eight quadrats of 50 × 50 cm were randomly placed. Amphipods were preserved in alcohol 70°C. In the laboratory, the specimens collected were identified and counted. Meanwhile, analyses of organic matter, particle size, and heavy metals from the soil taken from each station were made. Results: A total of 1,340 specimens of amphipods were collected, and eight species belonging to Talitridae family were identified. Species richness ranges from one species collected in the supralittoral zone of El Bcherliya (Ghar El Melh lagoon) and eight species in the supralittoral zone of Bizerte lagoon. In this last station, the relative abundance of amphipods was significantly higher (36.04%, N = 483). In addition, the diversity indices of Simpson, Shannon-Weaver, and equitability shows that the highest species diversity characterizes this same station while the community was more balanced in opposite El Boughaz (Ghar El Melh lagoon) (J″ = 0.996). Conclusions: The spatial distribution of different amphipod species depends on edaphic (heavy metals, granulometry, organic matter) and climatic (temperature, humidity) factors.

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Solar orientation of adult and laboratory-born juvenile sandhoppers: inter- and intra-population variation

Cited by 20 publications

References 16 publications

Use of multiple orientation cues by juvenile loggerhead sea turtlesCaretta caretta

Use of multiple orientation cues by juvenile loggerhead sea turtlesCaretta caretta

Up or down? Limpet orientation on steeply sloped substrata

Biodiversity of Talitridae family (Crustacea, Amphipoda) in some Tunisian coastal lagoons

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