[MARMAM] New publication: Abundance and site fidelity of bottlenose dolphin at the Tiber river estuary (Mediterranean Sea, Italy)

Daniela Silvia Pace danielasilvia.pace at uniroma1.it
Sun Mar 28 02:05:51 PDT 2021

Dear MARMAM members,

On behalf of my co-authors I am pleased to announce our new open-access

Pace D.S., Di Marco C., Giacomini G., Ferri S., Silvestri M., Papale E.,
Casoli E., Ventura D., Mingione M., Alaimo Di Loro P., Jona Lasinio G. and
Ardizzone G.D. (2021). Capitoline dolphins: residency patterns and
abundance estimate of Tursiops truncatus at the Tiber River estuary
(Mediterranean Sea). Biology 10(4), 275.

Periodic assessments of population status and trends to detect natural
influences and human effects on coastal dolphins are often limited by lack
of baseline information. Here, we investigated for the first time the
site-fidelity patterns and estimated the population size of bottlenose
dolphins (Tursiops truncatus) at the Tiber river estuary (Tyrrhenian Sea,
central Mediterranean) between 2017-2020. We used photoidentification data
and site-fidelity metrics to study the tendency of dolphins to remain in,
or return to, the study area, and capture-recapture models to estimate the
population abundance. A number of 347 unique individuals were identified.
The hierarchical cluster analysis highlighted 3 clusters, labelled as
"Resident" (individuals encountered at least 5 times in 3 different months,
over 3 distinct years; n=42), "Part-time" (individuals encountered at least
on 2 occasions in a month, in 2 different years; n=73) and "Transient"
(individuals encountered in 1 or more occasions in more than 1 month, none
of them in more than 1 year; n=232), each characterized by site-fidelity
metrics. Open POPAN modeling estimated a population size of 529 individuals
(95% CI: 456–614), showing that the Capitoline (Roman) coastal area and
nearby regions surrounding the Tiber river estuary represent and important,
suitable habitat for bottlenose dolphins, despite its proximity to one of
the major urban centers in the world (the city of Rome). Given the high
number of individuals in the area and the presence of "Residents" with
strong site-fidelity, we suggest that conservation plans should not be
focused only close to the Tiber river mouths but extended on a broader

Keywords: abundance; site-fidelity; Tiber river; bottlenose dolphin;
Tursiops truncatus; capture- recapture; Mediterranean Sea

With very best wishes,
Daniela Silvia Pace, PhD
Department of Environmental Biology
Marine Ecology Lab
Sapienza University of Rome
Viale dell’Università 32
00185 Rome, Italy
mail: danielasilvia.pace at uniroma1.it
mobile: +39 346 1039652
office: +39 06 4991 4763
skype: lagenorinco

[image: Risultati immagini per logo sapienza]

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