Stime di flusso genico tra popolazioni di <i>Orchestia montagui</i> (Amphipoda, Talitridae) delle isole circumsarde

Matthaeis, Elvira De; Cobolli, Marina; Davolos, Domenico; Mattoccia, Marco

doi:10.21426/b618110425

Cited by 10 publications

(12 citation statements)

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“…This reconciles the mtDNA-based F ST data with the outcomes of Barrier indicating a very strong barrier to gene flow between SNG and SAR. De Matthaeis et al (1995) analysed populations from the same localities with allozymes and found them to be genetically quite homogeneous, but allozymes notoriously detect only a small fraction of the existing genetic variation and could have not been able to reveal the genetic discontinuity we found with our markers.…”

Section: Population Genetic Structurementioning

confidence: 88%

“…The vast majority of them is based on allozymes (Angelini et al 1996;Cervelli et al 2006;De Matthaeis et al 1995, 2000a Here we present the first study that applies simultaneously mitochondrial and nuclear markers in a talitrids species in order to describe its population structure. Our study acts as a preliminary and exploratory research, seeking to address the interplay between population genetic structure and abiotic forces in the talitrid species O. montagui, by using markers with different evolutionary properties.…”

Section: Introductionmentioning

confidence: 98%

“…Different means of transportation have been hypothesized (i.e. birds or humans; Wildish 1988); nonetheless, the most presumable way of dispersing is still believed to be on floating wrack or wood (De Matthaeis et al 1995, 2000aPavesi et al 2011), a phenomenon known as rafting.…”

Section: Introductionmentioning

confidence: 99%

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Mitochondrial DNA and microsatellites reveal significant divergence in the beachflea Orchestia montagui (Talitridae: Amphipoda)

et al. 2012

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Talitrids are semiterrestrial crustacean amphipods inhabiting sandy and rocky beaches; they generally show limited active dispersal over long distances. In this study we assessed levels of population genetic structure and variability in the talitrid amphipod Orchestia montagui, a species strictly associated to stranded decaying heaps of the seagrass Posidonia oceanica. The study is based on six populations (153 individuals) and covers five basins of the Mediterranean Sea (Tyrrhenian, Ionian, Adriatic, Western and Eastern basins). Samples were screened for polymorphisms at a fragment of the mitochondrial DNA (mtDNA) coding for the cytochrome oxidase subunit I gene (COI; 571 base pairs) and at eight microsatellite loci. MtDNA revealed a relatively homogeneous haplogroup, which clustered together the populations from the Western, Tyrrhenian and Eastern basins, but not the populations from the Adriatic and Ionian ones; microsatellites detected two clusters, one including the Adriatic and Ionian populations, the second grouping all the others. We found a weak geographic pattern in the genetic structuring of the species, with a lack of isolation by distance at either class of markers. Results are discussed in terms of probability of passive dispersal over long distances through heaps of seagrass

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Section: Population Genetic Structurementioning

confidence: 88%

Section: Introductionmentioning

confidence: 98%

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Mitochondrial DNA and microsatellites reveal significant divergence in the beachflea Orchestia montagui (Talitridae: Amphipoda)

et al. 2012

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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: 99%

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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“…However, previous studies based on allozymes have revealed a poor genetic structure of O. montagui populations (De Matthaeis et al 1995, 2000a, 2000bAngelini et al 1996;Cervelli et al 2006). More recent studies that were based on more variable and informative markers (cytochrome oxidase subunit I and microsatellites) showed signatures of local differentiation (Pavesi et al 2012(Pavesi et al , 2013 and differed from previous hypotheses.…”

Section: Introductionmentioning

confidence: 95%

Population structure and dynamics ofOrchestia montagui(Crustacea: Amphipoda) in the Bizerte lagoon (northern Tunisia)

Jelassi

Bouslama

Khemaissia

et al. 2014

Italian Journal of Zoology

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The population structure and dynamics of Orchestia montagui Audouin, 1826 (Crustacea: Amphipoda: Talitridae) were studied from the supralittoral zone of Bizerte lagoon for 1 year. Monthly field surveys were performed from July 2006 to June 2007. Individuals sampled were categorized by sex, size and abundance on each sampling date. Abundance varied during the study period, with a noticeable decrease in November. Ovigerous females were found throughout the year. The sex ratio changed throughout the year but, overall, the population was male biased. Analysis of the size frequency polymodal distribution suggested the presence of six cohorts on the first sampling date and 10 new ones during the next 11 months. Lifespan was estimated at 6-7 months. Cohorts born in summer and autumn tend to live longer than those born in winter. At this study site, O. montagui appeared as a semiannual species, with iteroparous females producing at least two broods, and exhibited a bivoltine life cycle.

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Stime di flusso genico tra popolazioni di Orchestia montagui (Amphipoda, Talitridae) delle isole circumsarde

Cited by 10 publications

References 0 publications

Mitochondrial DNA and microsatellites reveal significant divergence in the beachflea Orchestia montagui (Talitridae: Amphipoda)

Mitochondrial DNA and microsatellites reveal significant divergence in the beachflea Orchestia montagui (Talitridae: Amphipoda)

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

Population structure and dynamics ofOrchestia montagui(Crustacea: Amphipoda) in the Bizerte lagoon (northern Tunisia)

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