Temporal and spatial distribution of three supralittoral amphipod species on a sandy beach of central Italy |
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Authors: | Laura Pavesi Valentina Iannilli Paola Zarattini Elvira De Matthaeis |
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Institution: | (1) Dipartimento di Biologia Animale e dell’Uomo, Università di Roma “La Sapienza”, Viale dell’Università 32, Rome, 00185, Italy |
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Abstract: | The distribution of three talitrid species—Talitrus saltator (Montagu, 1808), Orchestia gammarella (Pallas, 1766), Platorchestia platensis (Kroyer, 1845)—in the beach-dune system at the mouth of the Mignone River (central Italy) was analysed. It was related to
the variations of the following abiotic factors: temperature, penetrability, pH, conductivity and moisture of the sediment.
The beach-dune system is influenced by human impact and natural erosion. All species showed a maximum capture frequency in
November, while the abundance decreased to a minimum in July. T. saltator was dominant on the beach, the other two along the riverbank. Juveniles were abundant along the riverbank; they were most
abundant in November and almost disappeared in summer. T. saltator was more abundant near the waterline during the hottest months and occupied the inner beach in winter, with occasional presences
on the dune. Regression analysis between the abiotic factors and species abundance showed a positive relationship with pH
and temperature for T. saltator, while O. gammarella was negatively related to pH. Canonical correspondence analysis (CCA) showed that penetrability, moisture and temperature
had the greatest influence on the species. T. saltator was almost entirely confined to the beach transects and strongly associated with penetrability, temperature and pH values.
O. gammarella was mostly associated with the riverbank and P. platensis only found there and on a nearby pool. The two species were mainly influenced by moisture and variations in grain sizes of
the sediment. |
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