Effect of age, sex, and mutual interaction on the locomotor behavior ofOrchestia gammarellusin the supralittoral zone of Ghar El Melh lagoon (Bizerte, Tunisia)

Surface activity patterns of macrofauna on pocket, tidal beaches: Insights into the role of wrack and artificial lighting

“…Exceptions were represented by Britorchestia brito, active in a different spatial and temporal niche than the co-occurring T. saltator (Lastra et al, 2010) and by Orchestoidea tuberculata, for which a diurnal activity was also found, related to the tidal condition (Jaramillo et al, 2003). Ayari et al (2015) reported a reinforced activity pattern for the beach-hopper Orchestia gammarellus when tested in mixed groups of adults and juveniles with respect to individuals tested singly. Data from our study indicate indeed that even with low numbers of adults, as the case of Portuguese beach, juveniles do not fill the potential temporal niche in the night hours.…”

Endogenous activity rhythm inTalitrus saltator,Britorchestia brito(Crustacea, Amphipoda) andTylos europaeus(Crustacea, Isopoda) from Barkoukech Beach (Tabarka, Tunisia)

“…Orchestia gammarellus (Jelassi et al 2013a;Ayari et al 2015), Orchestia mediterranea and Orchestia cavimana (Wildish 1970), Deshayesorchestia deshayesii (Williams 1982(Williams , 1983 Ayari & Nasri-Ammar 2012a), and Talitrus saltator (Williams 1980;Bohli et al 2006;Bregazzi & Naylor 1972;Nasri-Ammar & Morgan 2005a;Ayari & Nasri-Ammar 2012a, 2012b, whereas the tidal estuarine species Corophium volutator showed almost exclusively a semidiurnal tidal pattern (Hölmstrom & Morgan 1983) that in the sand beach amphipod Bathyporeia pelagica is modulated over a circadian period (Fincham 1970a(Fincham , 1970b.…”

Locomotor behaviour in males, females and groups ofOrchestia montagui(Amphipoda, Talitridae) in the supralittoral zone of Bizerte lagoon

“…Supralittoral amphipods are usually nocturnal animals (Williamson 1954), such as shown in Orchestia gammarellus (Jelassi et al 2013a, b;Ayari et al 2015aAyari et al , 2015b, O. mediterranea and O. cavimana (Wildish 1970), Deshayesorchestia deshayesii (Williams 1982(Williams , 1983Ayari & Nasri-Ammar 2012a) and Talitrus saltator Ayari & Nasri-Ammar 2012b). Previous studies showed differences in the locomotor activity rhythm between genders in the same species, e.g.…”

“…Previous studies showed differences in the locomotor activity rhythm between genders in the same species, e.g. Bahndorff et al (2012) in Musca domestica and Ayari et al (2015a) in Orchestia gammarellus. Ayari et al (2015a) mentioned that circadian period and locomotor rhythm stability were, respectively, longer and better defined for males than for females in Orchestia gammarellus.…”

“…Bahndorff et al (2012) in Musca domestica and Ayari et al (2015a) in Orchestia gammarellus. Ayari et al (2015a) mentioned that circadian period and locomotor rhythm stability were, respectively, longer and better defined for males than for females in Orchestia gammarellus. Concerning other arthropods, Martin et al (1999) found that Drosophila melanogaster males showed a steady and stereotyped walking pace, while females modulate their activity patterns.…”