<\/p>\n
King penguins on a subantarctic island are now breeding 19 days earlier than in 2000, and more chicks are surviving the winter, a new study has found.<\/p>\n
This change has turned ocean warming into a short-term benefit for species that may still lose it.<\/p>\n
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On Possession Island, a remote island in the southern Indian Ocean between Antarctica and Madagascar, researchers tracked down a colony that was beginning to reproduce significantly earlier than before.<\/p>\n
Based on 24 years of records of tagged birds, Gael Bardon from the Center des Sciences de Monaco (CSM) linked that early start to a marked increase in chick survival.<\/p>\n
By 2023, chick survival will be 62 percent, up from 44 percent in 2000. This indicates that this change in timing had real biological effects.<\/p>\n
These benefits do not eliminate the underlying risks, and the benefits will persist as long as penguins can still access the food that allows them to do so.<\/p>\n
For king penguins, the timing of life events determines whether the chicks are able to store enough fat before the onset of winter.<\/p>\n
Each pair raises one chick, and while the chicks wait on land, the adults must shuttle fish back from the sea.<\/p>\n
An earlier start lengthens the feeding period, allowing the chick to add to its reserves before the long winter fast takes energy away.<\/p>\n
If the season starts later, many chicks will be smaller and more likely to starve by the time they reach the harshest months.<\/p>\n
Far south of the colony is a polar front, where warm and cold water meet and food is concentrated.<\/p>\n
There, the mixing lifts nutrients toward the surface, where they become food for plankton that support lanternfish, the penguins’ main prey during the breeding season.<\/p>\n
Warmer water can help those fish, but the same warming will push this rich feeding ground further south.<\/p>\n
This distance is important because on long hunting trips, parents spend time and energy feeding their chicks.<\/p>\n
Near its feeding zone, ocean warmth and chlorophyll a, a pigment used to track plankton near the surface, moved with the timing of reproduction.<\/p>\n
Lower plankton and water near 40 degrees Fahrenheit are consistent with early reproduction, likely because lanternfish were more available.<\/p>\n
At first the link sounds backwards, but the plankton left behind may indicate that the herbivores and fish below are out of sync.<\/p>\n
Therefore, the ocean appears to be a chain of delayed reactions, rather than a simple story of warm water benefits.<\/p>\n
Breeding success reflected not only the weather the parents faced that season, but also the ocean conditions a year or two earlier.<\/p>\n
This delay makes sense because penguins hunt older fish and squid. Penguin populations depend on how well their offspring fare while growing up and navigating changing oceans.<\/p>\n
Birds that eat well one year can breed stronger the next year, so adult birds may pass on the benefits.<\/p>\n
These delays are a warning that today’s delicious food season may still be shaped in part by yesterday’s ocean conditions.<\/p>\n
Even today, not all king penguins hunt in the same way, and that diversity may be what buys them time.<\/p>\n
Some birds head south to the best fronts, while others stay close to the colony and switch to prey such as squid.<\/p>\n
There are no breeding islands further south of Crozet Island, so extending each hunt may be the only option if the front continues to move.<\/p>\n
That flexibility can soften the blow, but it can’t erase a future in which our richest water continues to slip away.<\/p>\n
An increase in the number of surviving king penguin chicks does not automatically lead to a larger population on Possession Island, which already appears to be very close to reaching effective population limits.<\/p>\n
When breeding space and local resources become tight, extra young birds may not be packed into a complete colony and may settle elsewhere.<\/p>\n
That possibility applies to species spread across scattered sub-Antarctic islands, where increases in one location may later appear elsewhere.<\/p>\n
In other words, the health of a population may be more difficult to judge from a single coast than from a broader archipelago.<\/p>\n
This result stands out against broader patterns of early reproduction across penguins, as timing does not benefit all species equally.<\/p>\n
Penguin research at Oxford Brookes University helps explain why the discovery seemed unusual to ecologist Tom Hart.<\/p>\n
“This is a rare victory,” said Hart, who was not directly involved in the study. Still, the rare victory is not permanent if the underlying ocean system continues to change.<\/p>\n
Previous studies have already warned that king penguins could be stumbled if their fishing grounds are too far away from their breeding islands.<\/p>\n
A 2008 study found that warmer oceans reduced adult survival rates because parents had to travel farther to find food.<\/p>\n
Burdon’s paper points out that the same danger will continue, with the best conditions centered around waters around 40 degrees Fahrenheit.<\/p>\n
If that sweet spot moves warmer or farther south, the early breeding advantage can quickly disappear.<\/p>\n
In summary, king penguins are now able to maintain breeding success by changing their timing, diet, and routes to suit the warmer Southern Ocean.<\/p>\n
This adaptation is certainly real, but it is also narrow, and the coming decades will test whether flexibility can outweigh movement in food webs.<\/p>\n
This study scientific progress<\/em>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter for fascinating articles, exclusive content and the latest updates.<\/p>\n Check out EarthSnap, a free app from Eric Ralls and Earth.com.<\/p>\n \u2014\u2013<\/p>\n<\/div>\n #King #penguins #thriving #warm #Antarctic #climate #offering #hope<\/p>\n","protected":false},"excerpt":{"rendered":" King penguins on a subantarctic island are now breeding 19 days earlier than in 2000, and more chicks are surviving the winter, a new study has found. This change has turned ocean warming into a short-term benefit for species that may still lose it. King Penguin on Possession Island
On Possession Island, a … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":221,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2],"tags":[980,25,982,976,981,977,978,979],"class_list":["post-220","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","category-wilde-life","tag-antarctic","tag-climate","tag-hope","tag-king","tag-offering","tag-penguins","tag-thriving","tag-warm"],"_links":{"self":[{"href":"https:\/\/chabrok.com\/index.php?rest_route=\/wp\/v2\/posts\/220","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chabrok.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chabrok.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chabrok.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chabrok.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=220"}],"version-history":[{"count":0,"href":"https:\/\/chabrok.com\/index.php?rest_route=\/wp\/v2\/posts\/220\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chabrok.com\/index.php?rest_route=\/wp\/v2\/media\/221"}],"wp:attachment":[{"href":"https:\/\/chabrok.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chabrok.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chabrok.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}