בעקבות התגליות האחרונות באנטרקטיקה

[מגיש החדשות]

מדענים גילו כי דג הבקלה החי באיזור אנטרקטיקה נכנס למצב של תרדמת והשהיית הפעילות המטבולית בגופו, על מנת לחסוך באנרגיה במהלך עונת החורף הארוכה

מדענים בריטים גילו באנטרקטיקה דג בקלה הישן שנת חורף על מנת לחסוך באנרגיה במהלך עונת החורף הארוכה בקוטב הדרומי.

הדג, Notothenia coriiceps, נכנס למצב של השהיית הפעילות המטבולית בגופו, בדומה לתהליך תרדמת החורף שעוברים בעלי חיים על פני הקרקע, כגון קיפודים. דובים נוהגים גם הם להכנס לתרדמת חורף חלקית, ונרדמים מבלי שטמפרטורות גופם יורדת באופן קיצוני. תופעה דומה קיימת גם בקרב חרקים, רכיכות, דו חיים וזוחלים.

עד כה ידעו המדענים כי בדמם של הדגים החיים באנטרקטיקה קיים חומר מיוחד המונע קפאון, כחלק ממנגנון הסתגלות לתנאי מזג אוויר יוצרי דופן. "נראה כי הדגים משתמשים בעונת הקיץ הקצרה באנטרקטיקה כדי להשיג אנרגיה מספיקה למשך החורף", אומר קירון פרייזר, אחד החוקרים הבריטים.


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