ミナミアフリカオットセイとオーストラリアオットセイは、陸に戻ってから数時間後に心拍数が劇的に上昇することが新たな研究で明らかになった。この急上昇は、長時間にわたる水中での餌探しによる身体的ストレスから回復するためのものかもしれない。
「Frontiers in Physiology」誌に掲載された研究では、2種12頭のメスのオットセイの心拍数を追跡した。研究チームは2003年から2008年にかけて、南アフリカとオーストラリアの生息地で動物たちにモニターを装着した。データによると、オットセイが上陸してから6〜8時間後に心拍数が2倍になることが多く、毎分84回というピークに達した後、休息に伴う穏やかな範囲に落ち着くことがわかった。
Scientists have discovered that warm-bodied fish like great white sharks and tuna burn nearly four times more energy than cold-blooded species, facing heightened risks as oceans warm. The research highlights a 'double jeopardy' from increased metabolic demands and shrinking food supplies. Large specimens may struggle to maintain stable body temperatures above certain water thresholds.
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A study from NYU Abu Dhabi reveals that brief nighttime drops in ocean oxygen increase energy expenditure in small coral reef fish, potentially affecting reef ecosystems. Researchers examined the Gulf blenny in the Arabian Gulf, the world's hottest sea, where such conditions are already extreme. The findings highlight additional stress from warming oceans beyond just higher temperatures.
The body of a 55-year-old windsurfer, victim of a shark attack, was discovered on Sunday, February 22, in a bay in Nouméa, New Caledonia. Anse-Vata beach was evacuated to allow rescue operations, with authorities calling for caution. The incident follows heavy rains, which increase the risk of sharks near the coasts.
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A new study shows that slowing breathing rates can reduce anxiety-like behaviors even without any conscious effort or belief in its effects. Researchers used mice to demonstrate that the benefits come from physiological changes rather than placebo. The findings were presented at a summit in Los Angeles earlier this month.