Presentation on theme: "Cuvier’s Beaked Whales (Ziphius cavirostris) in the Ligurian Sea"— Presentation transcript:
1 Cuvier’s Beaked Whales (Ziphius cavirostris) in the Ligurian Sea Physical Habitat DescriptionAngela D'Amico1,4, Frederic Mineur1, Alberto Alvarez 1, Cristina Mori1,Michela Podesta 2, Nicola Portunato1, Marco Ballardini3, Barbara Nani31 1 SACLANT Undersea Research Centre Viale San Bartolomeo La Spezia, Italy 2 Museo di Storia Naturale Corso Venezia Milano, Italy 3 bluWest Via Scarincio 1218100 Imperia, Italy4 SPAWARSYSCEN D71353560 Hull SteetSan Diego, CA
2 Sirena Sea Trials Objectives Develop integrated database of environmental parameters and marine mammal populationsDevelop techniques which enable detection, classification, and tracking of marine mammalsRegional surveysCorsaro, bluWestImperia, ItalyZifio ‘01 - May 2001Sirena ‘ AugSirena ‘ Aug - 8 SeptSirena ‘ Sept - 7 OctSirena ‘ July
3 Oceanographic/biologic/acoustic observations Sirena MeasurementsOceanographic/biologic/acoustic observationsNATO research vessel, NRV AllianceItalian Navy’s Hydrographic Officeresearch vessel, Nave MagnaghiRemote sensingItalian Navy 30o Aerostormo(ELMAS) marine patrol aircraftItalian Navy SeaKing HelicopterIstituto Centrale per la Ricerca Applicata al Mare, BestiacciaVisual Monitoring
4 Sirena ’01 Sub-surface circulation Section 1Sirena ’01Geostrophic currents at 50mSirena ’01Temperature at 50mWestern CorsicaCurrentLigurian CurrentLevantine Intermediate WaterCounter clockwise current causesdoming of cold water in basin centerSirena ’01Vertical salinity distributionalong section 1
5 Seasonal/Yearly Variability Ligurian Sea Early Aug 1999Early Sep 2000Late Sep 2001Upwelling of cold water in basin center is visible on satellite imagesRegion of upwelling has high biologic productivity
6 Steep submarine canyon exists in NW portion of basin Genoa CanyonBathymetry of the canyon area(200m contour lines shown).Slope gradient within the canyon(0, 200, 1000, 2000m contours shown).Steep submarine canyon exists in NW portion of basin
7 Ziphius cavirostris in Genoa Canyon 19891983195619921963199719611934199619641957198719001925Ziphius cavirostris in Genoa CanyonSightings of Ziphius cavirostrisduring Sirena trialsHistoric strandings Ziphius cavirostrisRegional sightings of Ziphius cavirostrisSirena sea trial data indicate presence of Ziphius cavirostris in canyon region, not in basin centerSighting data base indicates that all sighting were made in water depths over 1000mStranding data indicates presence of Ziphius cavirostris in this region since 1900
8 Sirena ’01 Suspended Particulate Matter Sediment flow along surface and bottom of steep canyon wallsNot present in wider canyon regionSPM layer may have higher organic content
9 Canyon Circulation Zifio ‘01 Geostrophic velocities at 50 m depthInteraction between Ligurian current and steep canyonwalls form regional circulation pattern
10 ConclusionsStranding and sighting data suggest Ziphius cavirostris exhibit site fidelity in the Genoa CanyonZiphius cavirostris have been sighted on the surface only in water depths greater than 1000mCanyon environments form traps for suspended particulate matter containing high biomassCanyon region has regional circulation pattern resulting from interaction between the Ligurian Current and the steep canyon bathymetryCombination of these factors may form a preferential habitat, providing food for the species upon which Ziphius cavirostris preyFuther detailed measurenments of prey field required
11 AcknowledgementsThe authors would like to thank all participants from the NRV Alliance, CRV Manning; ITN Magnaghi, Corsaro, Bestiaccia. Special thanks to ADM D. Nascetti, CDR S. Monti, the Italian Marina Militare and to their Istituto Idrografico della Marina Office and R. Gisiner, the Office of Naval Research. The SOLMAR project acknowledges the participation of V. Teloni, M. Quero, W. Zimmer, P. Tyack, G. Pavan, J. Bondaryk, D. Barbour, F. DeStrobel, A. Strulese. Additionally, the authors would like to acknowledge all personnel from the following organizations who participated in the data collection effort, without them the success of the Sirena sea trials would not be possible;SACLANTCEN, Acquario di Genova, Aquastudio, BAE Systems, Biscay Dolphin Research Programme (A. Williams for the coordination of the visual survey during Sirena ’99 and ’00) , Centre d’Etudes Biologiques de Chize, Centre de Recherche sur les Mammiferes Marins, Groupe de Recherche sure les Cetaces, Centro di Bioacustica, Università di Pavia, Centro Studi Cetacei, Defense Establishment Research Agency, Istituto Centrale per la Ricerca Applicata al Mare, Istituto per lo Studio dell’Oceanografica Fisica, Istituto per lo Studio della Dinamica delle grandi Masse, Museo Civico di Storia Naturale di Milano, Office of Naval Research (R. Gisiner for supporting researchers to participate in the Sirena cruises), Southwest Fisheries Science Center, Tethys Research Institute, University of Genoa, University of North Carolina, University of Siena, Woods Hole Oceanographic Institute, WWF Liguria.
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