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How Open-Access Journals Are Transforming Science

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How Open-Access Journals Are Transforming Science

Academic publishers are locking up the latest research behind paywalls and hurting science, says Michael Eisen. We spoke with the co-founder of the Public Library of Science about democratizing scientific progress. Subscribe to our YouTube channel: http://youtube.com/reasontv Like us on Facebook: https://www.facebook.com/Reason.Magazine/ Follow ...

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古生物學家近日在期刊《PLOS One》刊登最新發現，在玻利維亞安地斯山脈的Carreras Pampas遺址發現高達16,000個獸腳類恐龍足跡，為目前全球已知數量最多的同類足跡絕錄，堪稱「恐龍高速公路」。據報，這些足跡屬生活於6,600萬至1億年前的白堊紀晚期的三趾、雙足行走的獸腳類恐龍，包括與暴龍 Trex同屬的肉食性種類。腳印被保存於古代湖岸泥層，顯示牠們除行走、奔跑，還包括超過1300個「游泳痕跡」。研究團隊表示牠們曾在泥濘的湖底沉積物中用爪子划動，隨後水位上升封存了這些痕跡，使其免受數百萬年的侵蝕。古生物學家Richard Butler讚譽此次發現是「了解白堊紀末期恐龍生活的珍貴窗口」。雖然被發現的足跡數量眾多，但該區幾乎未發現恐龍骨骼、牙齒或蛋化石。研究人員推測，該片高原曾連接南秘魯、玻利維亞與阿根廷北部的恐龍遷徙走廊，恐龍短暫穿越、飲水、覓食所留下的印記並未有長期定居。儘管這些遺跡存留了數千萬年，但亦曾因公路工程催毁主要遺跡。目前國家公園已介入保護，科學家預期在現有挖掘區域的邊緣，還將發現更多未出土的足跡。 (新聞來源：AP News) | 香港討論區

古生物學家近日在期刊《PLOS One》刊登最新發現，在玻利維亞安地斯山脈的Carreras Pampas遺址發現高達16,000個獸腳類恐龍足跡，為目前全球已知數量最多的同類足跡絕錄，堪稱「恐龍高速公路」。據報，這些足跡屬生活於6,600萬至1億年前的白堊紀晚期的三趾、雙足行走的獸腳類恐龍，包括與暴龍 Trex同屬的肉食性種類。腳印被保存於古代湖岸泥層，顯示牠們除行走、奔跑，還包括超過1300個「游泳痕跡」。研究團隊表示牠們曾在泥濘的湖底沉積物中用爪子划動，隨後水位上升封存了這些痕跡，使其免受數百萬年的侵蝕。古生物學家Richard Butler讚譽此次發現是「了解白堊紀末期恐龍生活的珍貴窗口」。雖然被發現的足跡數量眾多，但該區幾乎未發現恐龍骨骼、牙齒或蛋化石。研究人員推測，該片高原曾連接南秘魯、玻利維亞與阿根廷北部的恐龍遷徙走廊，恐龍短暫穿越、飲水、覓食所留下的印記並未有長期定居。儘管這些遺跡存留了數千萬年，但亦曾因公路工程催毁主要遺跡。目前國家公園已介入保護，科學家預期在現有挖掘區域的邊緣，還將發現更多未出土的足跡。 (新聞來源：AP News) | 香港討論區

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公視新聞網 on Instagram: "🦕玻利維亞藏著恐龍樂園? 玻利維亞（Bolivia）中部的托羅托羅國家公園（Torotoro National Park），竟然藏著世界最多的恐龍足跡? 根據美聯社報導，一支由加州洛馬琳達大學古生物學家組成的團隊，日前在期刊《PLOS One》發表研究報告，指出在國家公園的卡雷拉斯潘帕斯足跡遺址（Carreras Pampas tracks），發現16600個白堊紀（約6000多萬年前）獸腳類恐龍足跡。這是目前為止全球記錄到的，獸腳類恐龍足跡數量最多的一次，足跡大小深淺各異，顯示當時恐龍族群豐富。此外也發現當時恐龍曾試圖在此地進行游泳，在湖底沉積物上留下1378個肢體運動產生的刮痕，學者指出，恐龍是在水位上升前將爪子深壓入泥中，這讓足跡得以在後續的地質作用下保存完好、免於侵蝕。研究者之一西班牙古生物學家勞爾·埃斯佩蘭特（Raúl Esperante）表示，「世界上沒有哪個地方像這裡一樣，擁有如此豐富的獸腳類恐龍足跡。」研究報告稱，恐龍足跡得以妥善保存有幾個因素：所有足跡都在同一塊裸露地層上、該地底質與沉積或硬化條件各異，使深淺不一的足跡

公視新聞網 on Instagram: "🦕玻利維亞藏著恐龍樂園? 玻利維亞（Bolivia）中部的托羅托羅國家公園（Torotoro National Park），竟然藏著世界最多的恐龍足跡? 根據美聯社報導，一支由加州洛馬琳達大學古生物學家組成的團隊，日前在期刊《PLOS One》發表研究報告，指出在國家公園的卡雷拉斯潘帕斯足跡遺址（Carreras Pampas tracks），發現16600個白堊紀（約6000多萬年前）獸腳類恐龍足跡。這是目前為止全球記錄到的，獸腳類恐龍足跡數量最多的一次，足跡大小深淺各異，顯示當時恐龍族群豐富。此外也發現當時恐龍曾試圖在此地進行游泳，在湖底沉積物上留下1378個肢體運動產生的刮痕，學者指出，恐龍是在水位上升前將爪子深壓入泥中，這讓足跡得以在後續的地質作用下保存完好、免於侵蝕。研究者之一西班牙古生物學家勞爾·埃斯佩蘭特（Raúl Esperante）表示，「世界上沒有哪個地方像這裡一樣，擁有如此豐富的獸腳類恐龍足跡。」研究報告稱，恐龍足跡得以妥善保存有幾個因素：所有足跡都在同一塊裸露地層上、該地底質與沉積或硬化條件各異，使深淺不一的足跡

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