The use of slope and visual information in sandhoppers: innateness and plasticity

Scapini, Felicita; Lagar, M. C.; Mezzetti, M. C.

doi:10.1007/bf00349361

Cited by 18 publications

(8 citation statements)

References 11 publications

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“…For example, a large number of articles have been published on talitrid behaviour, behavioural plasticity, and genetic determination of different behaviours (e.g. Gerard, Vancassel, & Laffort, 1993;Scapini, 1997;Scapini, Lagar, & Mezzeti, 1993), while factors influencing their spatial distribution and oriented movements in sandy beaches have also been studied to a great extent (e.g. Borgioli et al, 1999;Scapini, Buiatti, De Matthaeis, & Mattoccia, 1995;Scapini, Buiatti, & Fallaci, 1989;Scapini & Fasinella, 1990;Scapini, Porri, Borgioli, & Martelli, 1999;Scapini & Quochi, 1992).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Talitrus saltator (Amphipoda, Talitridae) biology, dynamics, and secondary production in Atlantic (Portugal) and Mediterranean (Italy and Tunisia) populations

Marques

Gonçalves

Pardal

et al. 2003

Estuarine, Coastal and Shelf Science

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Talitrus saltator biology, population dynamics, and reproduction were studied more or less simultaneously at three sand beaches: Lavos, on the western coast of Portugal; Collelungo, on the Italian coast of the Thyrrenian Sea; and Zouara, on the northern coast of Tunisia. The species exhibited a consistent pattern of aggregated distribution. Densities were higher at Lavos than at Collelungo and Zouara. Reproduction took place from early March to late September at Lavos and Collelungo, and from late February to early November at Zouara. The average sex ratio was favourable to males at Lavos and Collelungo, and to females at Zouara. Based on data from Lavos, the population abundance was positively correlated with temperature, while the percentage of juveniles in the population was positively correlated with temperature and sediment moisture. Adult individuals from the Atlantic population were larger than the Mediterranean ones, while newborn individuals from the Mediterranean were slightly larger than Atlantic ones. Life span was estimated at 7-11 months at Lavos, 6-9 months at Collelungo, and 6-8 months at Zouara. Cohorts born at the beginning of the reproductive period tend to have shorter lives than the ones born later in the season, with longer life spans occurring in cohorts that crossed the winter to breed in the next year. The minimum period necessary for sexual differentiation after birth was estimated at AE4 weeks at Lavos, AE3 weeks at Collelungo, and AE4.5 weeks at Zouara, for males, and AE6 weeks at Lavos, and AE5 weeks at Collelungo and Zouara, for females. The period necessary for female's sexual maturation after being born was estimated at AE10 weeks at Lavos, and AE8 weeks at Collelungo and Zouara. At the studied sites, T. saltator appeared as semiannual species, with iteroparous females appearing to produce at least two broods per year, and exhibited a bivoltine life cycle. Growth production (P) was estimated at 0.74 g m ÿ2 yr ÿ1 ashfree dry weight (AFDW; 17.7 kJ m ÿ2 yr ÿ1 ) at Lavos, 0.12 g m ÿ2 yr ÿ1 AFDW (2.8 kJ m ÿ2 yr ÿ1 ) at Collelungo, and 0.61 g m ÿ2 yr ÿ1 AFDW (14.3 kJ m ÿ2 yr ÿ1 ) at Zouara. Elimination production (E) was estimated at 1.40 g m ÿ2 yr ÿ1 AFDW (33.5 kJ m ÿ2 yr ÿ1 ) at Lavos, 0.20 g m ÿ2 yr ÿ1 AFDW (4.8 kJ m ÿ2 yr ÿ1 ) at Collelungo, and 1.11 g m ÿ2 yr ÿ1 AFDW (26.6 kJ m ÿ2 yr ÿ1 ) at Zouara. The average annual biomass ð B BÞ (standing stock) was estimated at 0.13 g m ÿ2 at Lavos, 0.014 g m ÿ2 at Collelungo, and 0.084 g m ÿ2 at Zouara, resulting in P= B B ratios of 5.7 at Lavos, 8.2 at Collelungo, and 7.3 at Zouara, and E= B B ratios of 10.8 at Lavos, 14.4 at Collelungo, and 13.1 at Zouara. The present results, combined with information from literature, revealed a geographic variation in T. saltator populations with regard to their morphological characteristics, growth rates, life spans, and life cycles.

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Section: Introductionmentioning

confidence: 99%

Comparison of Talitrus saltator (Amphipoda, Talitridae) biology, dynamics, and secondary production in Atlantic (Portugal) and Mediterranean (Italy and Tunisia) populations

Marques

Gonçalves

Pardal

et al. 2003

Estuarine, Coastal and Shelf Science

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“…Visual stimuli are commonly emphasised, including the beach slope, landmarks, the dark strip of the sand dune or berm on the horizon, the sky polarisation pattern, and the sun and moon compass (Craig 1973;Edwards and Naylor 1987;Scapini et al 1993;Mezzetti et al 1994;Scapini 1997). Our findings suggest that amphipods do not use visual cues to detect potential food sources.…”

Section: Amphipods Use Olfactory Cues To Detect Freshly Deposited Wramentioning

confidence: 50%

“…Talitrid amphipods rely on subtle beach gradients and landmarks to navigate on wide beaches (Craig 1973;Edwards and Naylor 1987;Scapini et al 1993;Mezzetti et al 1994;Scapini 1997). What remains poorly known is how the spatial structure of wrack patches influences patterns of amphipod colonisation that, in turn, translates into ecological processes in the marine-terrestrial ecotone.…”

Section: Tidal Height Affects Colonisation Of Fresh Wrack Patchesmentioning

confidence: 98%

Colonisation of Beach-Cast Macrophyte Wrack Patches by Talitrid Amphipods: A Primer

Pelletier

Jelinski

Treplin

et al. 2011

Estuaries and Coasts

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Sandy beaches are characterised by heterogeneously distributed food sources both in time and space. The major energy supply is derived from marine subsidies in the form of beach-cast macrophyte wrack. Wrack patches are short-lived, and their position on the beaches varies with tidal and seasonal cycles as well as weather conditions. Little is known about how sandy beach inhabitants orient themselves towards, and colonise, wrack patches. In a series of field studies on islands off Vancouver Island (British Columbia, Canada), colonisation patterns of wrack patches by beach fleas and sand hoppers (Amphipoda: Talitridae), the most abundant macrofaunal detritivores, were studied. As indicated by colonisation of experimental patches of wrack and wrack surrogates that were either visible or buried in the sand, beach fleas (Traskorchestia traskiana) rely on olfactory cues for locating freshly deposited wrack patches in their patchy and dynamic habitat. Dense colonisation of freshly deposited algal wrack generally occurred within less than 1 h but depended upon the tidal height of wrack patches. Beach flea density in freshly deposited wrack patches increased with increasing tidal height. By contrast, sand hoppers (Megalorchestia californiana) colonised freshly deposited wrack patches in densities that decreased with tidal height. Discussing these interspecific differences, we provide a primer for future detailed studies on transport of matter along the marineterrestrial gradient of sand beaches.

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“…Many studies are interested to this family which plays an important ecological role as decomposers of organic matter and are considered as bioindicators of the quality of sandy beach (Griffiths et al 1983;Ketmaier et al 2003). This role was estimated by genetic (De Matthaeis et al 1994, 1995, 1996, 1998Scapini et al 1995;Bulnheim & Schwenzer 1999;Bouslama et al 2001;Ketmaier et al 2003;Bouslama 2009), reproduction, and spatio-temporal distribution Scapini et al 1999;Charfi-Cheikhrouha et al 2000;Gonçalves et al 2003;Marques et al 2003;Bouslama et al 2007;Gambineri & Scapini 2008;Jelassi et al 2012;Jelassi, Zimmer et al 2013), as well as behavioral approaches (Scapini et al 1993;Scapini 1997;Nasri-Ammar & Morgan 2005, 2006Rossano et al 2008, Ayari & Nasri-Ammar 2012a, 2012bJelassi, Akkari-Ayari et al 2013;.…”

Section: Please Scroll Down For Articlementioning

confidence: 98%

Effect of light intensity on the locomotor activity rhythm ofOrchestia montaguiandOrchestia gammarellusfrom the supralittoral zone of Bizerte lagoon (North of Tunisia)

Jelassi

Ayari

Nasri–Ammar

2014

Biological Rhythm Research

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Locomotor activity rhythm of Orchestia montagui and Orchestia gammarellus was investigated in populations from the supralittoral zone of Bizerte lagoon. The rhythm was recorded in individual animals in spring, firstly under continuous light with two simultaneous luminous intensities (5 and 140 lux) and secondly under continuous light with four different luminous intensities (5, 35, 75, 140 lux). Thirty specimens were tested for each experiment and for each species. Results revealed that whatever the species and the luminous intensity imposed, actograms showed a clear drift to the right lengthening the circadian period day after day. On the other hand, under continuous light with different luminous intensities, circadian periods determined by periodogram analysis decreased with increasing of luminous intensity for O. montagui whereas for O. gammarellus, circadian period lengthened with increasing of luminous intensity. Concerning ultradian period, it increased with luminous intensity whatever the species studied. Moreover, the stability was important under 5 lux for O. montagui and 140 lux for O. gammarellus. In addition, the study of the mean activity times calculated for these two species showed that the most important activity of individuals was observed under 75 lux for O. montagui and under 140 lux for O. gammarellus.

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The use of slope and visual information in sandhoppers: innateness and plasticity

Cited by 18 publications

References 11 publications

Comparison of Talitrus saltator (Amphipoda, Talitridae) biology, dynamics, and secondary production in Atlantic (Portugal) and Mediterranean (Italy and Tunisia) populations

Comparison of Talitrus saltator (Amphipoda, Talitridae) biology, dynamics, and secondary production in Atlantic (Portugal) and Mediterranean (Italy and Tunisia) populations

Colonisation of Beach-Cast Macrophyte Wrack Patches by Talitrid Amphipods: A Primer

Effect of light intensity on the locomotor activity rhythm ofOrchestia montaguiandOrchestia gammarellusfrom the supralittoral zone of Bizerte lagoon (North of Tunisia)

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