{"id":925234,"date":"2026-08-06T11:16:40","date_gmt":"2026-08-06T16:16:40","guid":{"rendered":"https:\/\/newsycanuse.com\/index.php\/2026\/08\/06\/what-satellite-photos-of-penguin-poop-tell-us-about-earths-health\/"},"modified":"2026-08-06T11:16:40","modified_gmt":"2026-08-06T16:16:40","slug":"what-satellite-photos-of-penguin-poop-tell-us-about-earths-health","status":"publish","type":"post","link":"https:\/\/newsycanuse.com\/index.php\/2026\/08\/06\/what-satellite-photos-of-penguin-poop-tell-us-about-earths-health\/","title":{"rendered":"What Satellite Photos of Penguin Poop Tell Us About Earth\u2019s Health"},"content":{"rendered":"
\n

Penguin poo, or guano, is a popular resource. Nests for penguin eggs are bowl-shaped depressions that the parents hollow into piles of guano and soil. And farmers love penguin guano for its rich nutrients, particularly nitrogen. In fact, guano harvest for farm fertilizer during the 19th century forced penguins to lay so many eggs on exposed ground that it led to population crashes.\u00a0<\/p>\n

Now, it turns out that guano is also useful for monitoring penguin recovery and responses to modern threats, as a recent study<\/a> published in Current Biology<\/em> used guano patterns to decipher how global climate change is affecting penguins.\u00a0<\/p>\n

\u201cIt\u2019s exactly what it sounds like,\u201d explained study author Michael Polito, a marine biologist at the University of California, Santa Cruz, in a press release<\/a>. \u201cWe spied on penguins from space by using satellite images to figure out what they eat all around Antarctica to help\u00a0explain their diet and population response to recent climate change.\u201d<\/p>\n

Read more: \u201cMy Life with the Penguins<\/a>\u201d<\/strong><\/p>\n

A group of wildlife biologists from several United States universities collaborated with NASA and the U.S. Geological Survey to plot annual shifts in the diets of Ad\u00e9lie penguins (Pygoscelis adeliae<\/em>) over three decades. A 2018 study<\/a> demonstrated the utility of Landsat images in penguin research, identifying an unknown colony of more than 1.5 million Ad\u00e9lie penguins on the Danger Islands off Antarctica. The recent study deepens the findings by analyzing guano color across Ad\u00e9lies\u2019 Antarctic range to assess population health.<\/p>\n

In combining spectral image analysis with isotope analysis of guano field samples, the researchers found pronounced geographic differences in penguin diet among the 119 known Ad\u00e9lie populations. In areas with more sea ice, the penguins fed mostly on fish, primarily silverfish. In areas with declining sea ice, they shifted to a krill-heavy diet, feeding lower in the food web. Furthermore, year-to-year variations in their diets were strongly linked to fluctuations in sea ice, a connection the study authors attribute to reduced abundance of silverfish during warm years.<\/p>\n

The results also showed that colonies that had to rely on krill were more likely to suffer population declines than those eating fish. Because penguin chicks get more nutrition from fish, they tend to grow larger on a fish diet than on a krill diet. Ad\u00e9lie penguins must compete with seals and whales for krill as well.\u00a0<\/p>\n

Unfortunately, since data collection for this study ended in 2013, sea ice has continued to decline to record low levels. \u201c[Ad\u00e9lie penguins] act as a \u2018canary in the coal mine,\u2019\u201d said Polito, \u201cand our study illustrates how recent warming has disrupted the Antarctic marine food web they rely on to the detriment of many of their populations.\u201d <\/p>\n

Enjoying <\/em>Nautilus<\/a>? Subscribe to our free <\/em>newsletter<\/em><\/a>.<\/p>\n

Lead image: Julie Chandelier \/ Ocean Image Bank<\/em><\/p>\n<\/div>\n

Devin Reese
Read More<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Penguin poo, or guano, is a popular resource. Nests for penguin eggs are bowl-shaped depressions that the parents hollow into piles of guano and soil. And farmers love penguin guano for its rich nutrients, particularly nitrogen. In fact, guano harvest for farm fertilizer during the 19th century forced penguins to lay so many eggs on<\/p>\n","protected":false},"author":1,"featured_media":925235,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[431,26361],"tags":[6583,7296],"class_list":["post-925234","post","type-post","status-publish","format-standard","has-post-thumbnail","category-photos","category-satellite","tag-photos","tag-satellite"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/posts\/925234","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/comments?post=925234"}],"version-history":[{"count":0,"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/posts\/925234\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/media\/925235"}],"wp:attachment":[{"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/media?parent=925234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/categories?post=925234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/newsycanuse.com\/index.php\/wp-json\/wp\/v2\/tags?post=925234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}