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气候变化对秘鲁渔业的威胁

  • 2026-03-22 11:01:15
气候变化对秘鲁渔业的威胁

秘鲁鳀鱼个头不大,影响却不小。它们只有食指大小,捕获量有时占全球渔获量的15%。最近,古代沉积物和化石的研究发现,水温上升曾经几乎灭绝了这种宝贵的资源,由此引发了人们对当今气候变化可能重演灾难的担忧。

“这一发现确实令人担忧”,海洋生态学家Becca Selden说,不断刷新记录的气候对鱼类的影响表明生态系统正在彻底改变

长期以来,科学家一直担心气候变化对鱼类种群的影响,原因之一是某些物种需要在相对固定的温度范围才会繁殖。一个更大问题是,当水温上升时,水中的氧气减少,大鱼受到的影响更大,这是因为相较而言,小鱼比大鱼有更大的鳃面积来获取氧气。

秘鲁附近的水域似乎是研究气候变化对鱼类种群影响的理想场所。科学家Salvatteci研究了一段发生在116,000130,000年前的海底沉积物,当时地球正在经历比今天更温暖的气候。科学家研究了由海洋球藻化石产生的生物标志物,测量了氮同位素。结果表明,那时的海水比现在的高约2℃,氧气含量更少。

紧接着,Salvatteci要弄清楚哪些鱼生活在那时的水中——这项工作耗时 2 年,科学家采挖泥沙并计算超过100,000块椎骨和其他鱼类遗骸。结果显示:在过去一个世纪的时间里,以鳀鱼骨骼为主;而在更早的温暖时期,大约60%的鱼是其他较小的物种,包括虾虎鱼,其大小约为鳀鱼的一半,更耐受低氧环境。其他较多的还有深水物种,如巴拿马光鱼,它们也可以在低氧条件下成长。

(当海洋温度上升,耐低氧环境的小鱼、深水鱼种更容易繁衍)

与鳀鱼相比,这些物种的繁荣会给渔业带来挑战。由于尺寸小,而且不会大规模聚集,捕获它们需要孔径更小的网,拖网渔船需要航行更远,燃烧更多的燃料才能捕获相当的数量。虾虎鱼的营养也不如鳀鱼,鳀鱼富含多不饱和脂肪酸。即使是鳀鱼,当气候变得不适时,生长和肥满状态也变得糟糕。

(秘鲁鳀鱼)

全球气候持续变暖不仅导致渔业资源整体恶化,更通过频繁引发自然灾害给局部带来灾难。2022年,来自秘鲁中北部第II季度的渔业数据显示,受“厄尔尼诺”的影响,鳀鱼的捕捞量虽然达到配额,但是鱼油产量只有预期的1/3,关键原因是鱼油脂含量只有0.89%,大大低于正常的3-4%

时间来到20236月,秘鲁渔业部门进行试探性捕捞,结果显示鱼群幼鱼比例过大。到了8月,即使面临来自产业界的巨大压力,当局不得不取消新年第I季度中北部的捕捞。

渔业的未来,何去何从……

原文于202216日发表在《科学》杂志。

为了主题更聚焦,本文在原文的基础上进行了删减,查看原文请点击左下角,转发请注明出处。

https://www.science.org/content/article/climate-change-threatens-one-world-s-biggest-fish-harvests

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  1. CONNECT:[ UseTime:0.000660s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000868s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000184s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000533s ]
  8. SELECT * FROM `article` WHERE `id` = 481265 LIMIT 1 [ RunTime:0.000395s ]
  9. UPDATE `article` SET `lasttime` = 1775803038 WHERE `id` = 481265 [ RunTime:0.010660s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000294s ]
  11. SELECT * FROM `article` WHERE `id` < 481265 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000530s ]
  12. SELECT * FROM `article` WHERE `id` > 481265 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004950s ]
  13. SELECT * FROM `article` WHERE `id` < 481265 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000818s ]
  14. SELECT * FROM `article` WHERE `id` < 481265 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002617s ]
  15. SELECT * FROM `article` WHERE `id` < 481265 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000900s ]
0.094658s