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ECS-TALK  2005

ECS-TALK 2005

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Subject:

From the ECS website

From:

Gnone Guido <[log in to unmask]>

Reply-To:

Gnone Guido <[log in to unmask]>

Date:

Mon, 17 Oct 2005 18:26:06 +0200

Content-Type:

text/plain

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Parts/Attachments

text/plain (26 lines)

> Dear colleagues from the ECS,
> 
> I'd like to inform you in relation to a recent paper on the bottlenose dolphin in the Mediterranean sea.
> 
> If you're interested in the full text please contact myself by e-mail.
> 
> Best regards,
> 
> Guido Gnone
> Research Coordinator
> Acquario di Genova
> [log in to unmask]
> 
> -----------------------------------------------------------------------------------------------------------------------------------------------
> 
> Gnone, G., Caltavuturo, G., Tomasini, A., Zavatta, A. & Nobili, A. 2005. Analysis of the presence of the bottlenose dolphin (Tursiops truncatus) along the Italian peninsula in relation to the bathymetry of the coastal band. Atti Soc. it. Sci. nat Museo civ. Stor. nat. Milano, 146 (I): 39-48.
> 
> Abstract - The bottlenose dolphin (Tursiops truncatus) is known as a cosmopolitan species with primarily coastal habits. According to various studies carried out along the Italian coasts, this dolphin finds its habitat within the 100-m isobath. The striped dolphin (Stenella coeruleoalba), on the contrary, is known as a cosmopolitan, gregarious species with pelagic habits.
> On the basis of these premises, the following hypothesis was formulated: if the bottlenose dolphin finds its habitat of choice in waters less than 100-m deep, then its presence along the Italian coast should correlate with the extension of that habitat, that is, with the distance from the coastline to the 100-m isobath. In the case of the striped dolphin which, on the contrary, tends to avoid waters less than 100-m deep, there should be no correlation or rather there should be an inverse correlation with respect to that of the bottlenose dolphin. In order to verify this hypothesis, we compared the geographical distribution of the dolphins stranded along the Italian coast with the bathymetry of the coastal band. The hypothesis was finally confirmed by statistical analysis.
> Key-words: Italian peninsula, Tursiops truncatus, Stenella coeruleoalba, habitat, stranding.
> 
> Riassunto - Analisi della presenza del tursiope (Tursiops truncatus) lungo la costa della penisola italiana in relazione alla batimetria della fascia costiera.
> Il tursiope (Tursiops truncatus) è noto come specie cosmopolita dalle abitudini prevalentemente costiere. Secondo diversi studi condotti lungo le coste italiane, questo delfino trova il suo habitat entro la batimetria dei 100 m. La stenella (Stenella coeruleoalba), al contrario, è nota come specie cosmopolita, gregaria dalle abitudini pelagiche. Sulla base di tali premesse, si è formulata la seguente ipotesi: se il tursiope trova il suo habitat d> '> elezione nelle acque di profondità inferiore a 100 m, allora la sua presenza lungo la costa italiana dovrebbe essere correlata con l> '> estensione dello stesso habitat, ovvero con la distanza dell> '> isobata dei 100 m dalla linea di costa. Nel caso della stenella, che al contrario tende a evitare acque di profondità inferiore ai 100 m, tale correlazione dovrebbe venire a mancare ovvero dovrebbe esistere una correlazione inversa rispetto a quella del tursiope. Per verificare tale ipotesi, sono stati messi a confronto i dati relativi alla distribuzione geografica degli spiaggiamenti di delfini lungo la costa italiana con la batimetria della fascia costiera. L> '> ipotesi è stata infine confermata dai risultati statistici.
> Parole chiave: Penisola italiana, Tursiops truncatus, Stenella coeruleoalba, habitat, spiaggiamento.
> 

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