Orientation in Talitrus saltator (Montagu): trends in intrapopulation variability related to environmental and intrinsic factors

Borgioli, C.; Martelli, L.; Porri, Francesca; D’Elia, Angela; Marchetti, Giovanni M.; Scapini, Felicita

doi:10.1016/s0022-0981(99)00012-x

Cited by 46 publications

(25 citation statements)

References 19 publications

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“…3 and 4, Table 6), which interacted with the other variables. This result was expected on this beach that had a well-developed dune system and is in agreement with previous findings on Mediterranean coasts (Borgioli et al, 1999b;Scapini, 2006) and on the same Leirosa beach (Bessa et al, 2013b), confirming that populations from beaches with a prominent dune rely mainly on landscape visual cues, in contrast to populations from flat beaches, which use preferentially the sun compass (Hartwick, 1976;Scapini et al, 1992). Other highly significant factors on orientation were those involved in the use of the sun compass (sun azimuth, solar time, sky cloudiness) that played its role mainly when the landscape was not visible, and the time (month) of the experiments.…”

Section: Discussionsupporting

confidence: 93%

Macrofaunal community abundance and diversity and talitrid orientation as potential indicators of ecological long-term effects of a sand-dune recovery intervention

Nourisson

Bessa

Scapini

et al. 2014

Ecological Indicators

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a b s t r a c tIn the last decades the increasing urban development on coastal areas have produced extensive modifications on shores all over the world, making critical the active management of pressures on sandy beaches. The use of engineering solutions to counteract beach erosion has been significantly increasing; the ecological indicators used to monitor these interventions generally focus on short-and medium-term effects, while little is known on their effectiveness on long-term temporal scales. The following ecological indicators have been tested in the present study: (a) macrofaunal community abundance and diversity and (b) orientation behaviour of Talitrus saltator, a talitrid amphipod widespread on Mediterranean and European Atlantic sandy beaches. Two sites were considered on a sandy beach of the Portuguese Atlantic coast, one located in front of a natural dune and the other at about 500 m of distance, where the dune had been rebuilt between 2000 and 2008 using geotextile tubes. In 2011 and 2012, macrofauna sampling and orientation experiments on T. saltator were performed at both sites in spring and autumn; contemporaneously the main environmental variables were registered. Macrofaunal data were analysed through multivariate statistical tests, and for the orientation distributions the circular statistics were calculated and multivariate analyses for angular data were performed. Geotextiles appeared to be successful in stabilising the recovered dunes; accordingly, the diversity of the macrofaunal communities and the orientation performances of T. saltator showed no differences between the altered and control sites. Significant reductions were nevertheless observed in the artificial-dune site regarding the abundance of T. saltator and, to a lesser extent, macrofaunal densities, likely ascribable to the presence of geotextiles instead of a vegetated natural dune, preventing invertebrates to burrow into the sand. These results, complementing a more comprehensive study on these two sites, indicate the abundance of T. saltator as the best indicator to follow long-term effects of this kind of soft-engineering intervention. The use of this bioindicator may be recommended for the late phases of monitoring procedures in dune-recovery processes.

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Section: Discussionsupporting

confidence: 93%

Macrofaunal community abundance and diversity and talitrid orientation as potential indicators of ecological long-term effects of a sand-dune recovery intervention

Nourisson

Bessa

Scapini

et al. 2014

Ecological Indicators

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“…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). With regard to biodiversity, along the European coasts, talitrid populations have been compared genetically to assess interand intra-specific variations (De Matthaeis, Cobolli, Mattocia, & Scapini, 1995).…”

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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“…The influence of meteorological variables on orientation was expected, as this behaviour represents a response to immediate environmental conditions (Borgioli et al 1999). This was confirmed in this case as well, with the presence in all best models of those variables related to a dehydration risk for sandhoppers: air humidity and season (the latter grouping higher air humidityvalues under increasing cloud cover in autumn, consistent with the seasonality expected at this latitude).…”

Section: Discussionmentioning

confidence: 99%

“…It was assumed that all individuals collected had experienced the beach conditions, and were able to integrate this experience into their behaviour and cope with the immediate environmental conditions. However, behavioural dif- ferences could also be related to individual characteristics such as size, age and sex (Borgioli et al 1999). For this purpose, the cephalic length (mm) of each individual was measured to obtain a proxy of the size (Marques & Anastácio 2002), whilst the age was estimated by the number of tagma on the second antenna (Williams 1983).…”

Section: Methodsmentioning

confidence: 99%

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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Orientation in Talitrus saltator (Montagu): trends in intrapopulation variability related to environmental and intrinsic factors

Cited by 46 publications

References 19 publications

Macrofaunal community abundance and diversity and talitrid orientation as potential indicators of ecological long-term effects of a sand-dune recovery intervention

Macrofaunal community abundance and diversity and talitrid orientation as potential indicators of ecological long-term effects of a sand-dune recovery intervention

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

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

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