דולפינים ואריות ים שומרים על צוללות בארה"ב

עידכון אחרון מאיטליה

עדכון של ג'יוזפה, יו"ר הועדה המדעית של אקובמס, לאירוע החפת הראשתנים באיטליה אביעד Subject: [ECS-TALK] Rare atypical mass stranding of sperm whales in the Mediterranean Sea Between Thursday 10 and Friday 11 December a pod of seven sperm whales stranded on the coast of the Gargano Peninsula (Italy), in the Southern Adriatic Sea. The animals – including several males of 10+ m - are scattered along a stretch of about six km of beach; five have already died. Bystanders reported that two more animals were able to regain deep waters, however this is currently unconfirmed. Mass strandings of sperm whales are extremely rare in the Mediterranean, and limited to ancient times. These include a stranding of 16, reported near Mazzara del Vallo (Sicily) in 1734, and a stranding of six occurred near Cittanova d’Istria, northern Adriatic Sea, in 1853. Scientists from the Centro Studi Cetacei, the Natural History Museum of Milan, and the Italian universities of Bari, Padua (Sandro Mazzariol, also member of the ACCOBAMS emergency task force), Pavia, Siena, and Las Palmas (Spain), among others, are on site since this morning and coordinate operations and scientific analyses. Necropsies will hopefully help determining whether such atypical stranding might be connected with the presence of specific human activities likely to be hazardous to cetaceans in the area. Some photos of the mass stranding event, taken on Saturday 12th between 10:45 AM and 1:45 PM, can be viewed from the web page below: http://www.tethys.org/download/focevarano/ -- Giuseppe Notarbartolo di Sciara Chair, ACCOBAMS Scientific Committee [email protected] - www.accobams.org
 

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מאיפה כל הדם הזה מגיע?

הם פוצעים את עצמם במאבק לחזור למים? או שבגלל המשקל שלהם הם פשוט מתחילים להתבקע? :/
 

נ ע ל

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ואו

מדהימים גם כשמתחילים לאבד צורה אבל אם הם הגיעו כבר מתים, אז זה לא ממש stranding/beaching, לא?
 
stranding/beaching בעברית החפה

היא מושג שמשתמשים בו ליונק ימי חי או מת שמגיע לחוף. לפי הדיווחים 5 הגיעו מתים ושנים נוספים הגיעו חיים לחוף אבל מתו זמן קצר לאחר ההחפה.
 
תאוריה מעניינת כהסבר לאירוע באיטליה

The most likely cause of this beaching was an 5.9 magnitude shallow-focused undersea earthquake that occurred on 3 November 2009 just offshore of Zakinthos Island, about 500 miles southeast of the stranding site. The whales were injured (barotrauma) by rapid changes in ambient pressure generated near the epicenter by the vertical thrusting in the seabed during this quake. The excessive changes in pressure led to a rupture in the head sinuses which in turn prevented the animals from echo-navigating and diving. The travel path of the whales from the epicenter to the beach was controlled by surface currents. The ear bones are intact and not injured. This pod was able to remain in deeper water until dehydration and lack of nourishment weakened them to the point that they could no longer avoid a stranding in the strong current whipped up by the heavy weather. I've put a quick webpage at http://www.deafwhale.com/stranded_whale/2009/sperm_whales_italy.htm to explain the seaquake connection in more detail. This is a rare opportunity to understand the mystery of why whales mass strand. It is highly likely that these stranded whales can be photo identified since the sperm whale population offshore of Zakinthos has been well-studied for years. In fact, there was a film made only recently of the sperm whales in this area. These particular beached whales might even be part of that film. http://www.whaletrackers.com/whales-mediterranean-sea/sperm-whales-of-greece/ For more information on the seaquake theory contact: Dave Williams [email protected] Florida landline 954 306 1549
 

Dani Barchana

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נשמע לי הסבר קצת דחוק ../images/Emo10.gif

הסינוסים לא אמורים להפגע מהפרשי לחץ כאלה, רובם בכלל מלאים ברקמת דם ספוגית למניעת קריסה בלחצים העצומים שבעומק אליו הם צוללים.. יותר סביר שרעש האדמה "הטיס" אותם בבהלה למעלה, והנזקים הם נזקי דקומפרסיה ולא ברוטראומה. אנסה לברר יותר פרטים.
 
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