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On Possession Island, a remote island in the southern Indian Ocean between Antarctica and Madagascar, researchers followed a colony where breeding now starts noticeably earlier than it once did.<\/p>\n
Working from a 24-year record of tagged birds, Gael Bardon at the Monaco Scientific Center (CSM<\/a>) connected that earlier start to a marked rise in chick survival.<\/p>\n By 2023, 62 percent of chicks survived, up from 44 percent in 2000, showing that this shift in timing has carried real biological consequences.<\/p>\n Those gains have not removed the underlying risk, and the advantage holds only as long as the penguins can still reach the food that makes it possible.<\/p>\n Why earlier breeding helps<\/p>\n For king penguins<\/a>, the timing of life events shapes whether a chick can build enough fat before winter begins.<\/p>\n Each pair raises one chick, and adults must shuttle fish back from sea while the young bird waits on land.<\/p>\n An earlier start lengthens that feeding window, so chicks add reserves before a long winter fast strips energy away.<\/p>\n When the season opens later, many chicks reach the hardest months smaller, and starvation becomes a much more likely ending.<\/p>\n King penguins\u2019 food source<\/p>\n Far south of the colony lies the polar front<\/a>, where warm and cold waters meet and concentrate food.<\/p>\n There, mixing lifts nutrients toward the surface, feeding plankton that support lanternfish, the penguins\u2019 main prey during breeding.<\/p>\n Warm water can help those fish, yet the same warming also nudges this rich feeding zone farther south.<\/p>\n That distance matters because longer hunting trips burn time and energy parents would rather spend feeding chicks.<\/p>\n Signals from seawater<\/p>\n Near that feeding zone, sea warmth and chlorophyll a, a pigment used to track plankton near the surface, moved with breeding timing.<\/p>\n Lower surface plankton and water close to about 40 degrees Fahrenheit matched earlier breeding, likely because lanternfish<\/a> were more available.<\/p>\n The link sounds backward at first, but leftover plankton can signal that the grazers and fish below are out of sync.<\/p>\n That makes the ocean look less like a simple warm-water benefit story and more like a chain of delayed reactions.<\/p>\n Benefits arrive later<\/p>\n Breeding success also reflected ocean conditions from one to two years earlier, not just the weather parents faced that season.<\/p>\n That delay makes sense because penguins catch older fish and squid, whose population numbers depend on how well their offspring fared while growing and navigating the changing seas.<\/p>\n Adults may also carry the benefit forward, since a bird that eats well one year can breed stronger next year.<\/p>\n Those lags warn that today\u2019s good food season may still be partly shaped by yesterday\u2019s ocean conditions.<\/p>\n King penguin hunting styles<\/p>\n Even now, king penguins do not all hunt the same way, and that variety may be buying them time.<\/p>\n Some birds head south to the best fronts, while others stay nearer the colony and switch to prey like squid.<\/p>\n Because no breeding islands sit farther south of Crozet, stretching each hunt may be the only option if the front keeps moving.<\/p>\n That flexibility can soften a blow, but it cannot erase a future where the richest waters keep sliding farther away.<\/p>\n Why numbers stalled<\/p>\n More surviving King penguin chicks did not automatically produce a larger crowd on Possession Island, which seems very close already to its practical population limit.<\/p>\n When breeding space and local resources tighten, extra young birds may settle elsewhere instead of squeezing into a full colony.<\/p>\n That possibility fits a species spread across scattered sub-Antarctic islands, where gains in one place can show up elsewhere later.<\/p>\n Population health, in other words, may be harder to judge from a single beach than from the wider archipelago.<\/p>\n A rare bright spot<\/p>\n Against a broad pattern<\/a> of earlier breeding across penguins, this result stands out because timing does not help every species equally.<\/p>\n Penguin work at Oxford Brookes University<\/a> helps explain why the finding looked unusual to ecologist Tom Hart.<\/p>\n \u201cThis is a rare win,\u201d said Hart, who was not directly involved in the research. Even so, a rare win is not a permanent one when the ocean system underneath it keeps changing.<\/p>\n King penguins in a warming world<\/p>\n Past work already warned that king penguins can stumble when the fishing zone moves too far from breeding islands.<\/p>\n A 2008 study<\/a> tied warmer seas to lower adult survival, because parents had farther to travel for food.<\/p>\n Bardon\u2019s paper points to the same danger ahead, with the best conditions centered around waters near 40 degrees Fahrenheit.<\/p>\n Push that sweet spot much warmer or much farther south, and the early breeding advantage could disappear fast.<\/p>\n To sum it all up, king penguins have been able to maintain breeding<\/a> success through timing, diet, and route changes that currently align with the warmer Southern Ocean.<\/p>\n This adaptation is definitely real, but also narrow, and the next few decades will test whether flexibility can outrun a moving food web.<\/p>\n The study is published in Science Advances<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"A new study has found that king penguins on one sub-Antarctic island now begin breeding 19 days earlier…\n","protected":false},"author":2,"featured_media":359104,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[111,139,69,147,406],"class_list":{"0":"post-359103","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-wildlife","8":"tag-new-zealand","9":"tag-newzealand","10":"tag-nz","11":"tag-science","12":"tag-wildlife"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/359103","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/comments?post=359103"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/359103\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media\/359104"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media?parent=359103"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/categories?post=359103"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/tags?post=359103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}