{"id":3552,"date":"2021-09-23T10:05:22","date_gmt":"2021-09-23T10:05:22","guid":{"rendered":"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions"},"modified":"2021-09-23T10:05:22","modified_gmt":"2021-09-23T10:05:22","slug":"what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions","title":{"rendered":"What the Mauritius kestrel can teach us about wildlife reintroductions"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong><a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a> &#8211; <a href=\"https:\/\/www.africa-press.net\/mauritius\">Mauritius<\/a>. <\/strong><\/span>Using decades of data, a recent study analyzed long-term population trends for the Mauritius kestrel, a bird of prey endemic to the island of Mauritius, which was once considered the rarest bird in the world.<\/p>\n<p>While an intensive recovery program for the kestrel helped increase the population to an estimated 400 individuals by the 1990s, scientists now estimate there are fewer than 250 in the wild.<\/p>\n<p>They link this decline to a halt in monitoring efforts, which occurred, ironically, after the species\u2019 conservation status had improved and prompted conservation donors to stop funding the recovery efforts.<\/p>\n<p>Scientists say the key to wildlife reintroduction success is maintaining post-release monitoring efforts after captive rearing, a conservation tool that can be used for species beyond birds of prey.<\/p>\n<p>They were once considered the most threatened bird in the world: with just four remaining individuals on the island in 1974, the Mauritius kestrel (Falco punctatus) seemed doomed to extinction. Now, it\u2019s a conservation marvel, acting as an example for the translocation and reintroduction of other species too.<\/p>\n<p>A team of scientists from five organizations analyzed the long-term trends of four isolated populations of reintroduced Mauritius kestrels in their recent paper published in the IBIS: International Journal of Avian Science.<\/p>\n<p>Their findings help shed light on the key ingredients for successful wildlife reintroductions, a conservation practice where scientists raise newborn animals in captivity and release them into the wild to boost population numbers. Mauritius, an island smaller than the U. S. state of Rhode Island, lies 800 kilometers (500 miles) east of Madagascar in the Indian Ocean.<\/p>\n<p>It\u2019s also where the dodo (Raphus cucullatus) famously went extinct in the 17th century, an unfortunate but enlightening moment for science, said Malcolm Nicoll, the paper\u2019s lead author and senior research fellow at the Zoological Society of London\u2019s (ZSL) Institute of Zoology.<\/p>\n<p>\u201cThe extinction of the dodo brought about the realization that extinction was possible,\u201d he said in an interview with Mongabay, adding that understanding failure helps people learn.<\/p>\n<p>\u201cIf you just try and ignore history, then you\u2019re only going to make the same mistakes as other people have made in the past.<\/p>\n<p>\u201d<br \/>\nThe ups and downs of a conservation success story<br \/>\nThe scientists found that some populations of Mauritius kestrels did far better than others, a mystery examined by the new research.<\/p>\n<p>While they expected the western population to continue growing, it declined during a six-year gap in monitoring, and while the eastern population thrived, the northern population went locally extinct by the early 2000s.<\/p>\n<p>Why did some populations thrive while others vanished?<br \/>\nA number of factors influenced the populations\u2019 varying success, including habitat quality, number of nest boxes, food availability, and invasive species predation.<\/p>\n<p>But overall, the researchers agree that the success of wildlife reintroductions hinges on consistent post-release monitoring. \u201cYou\u2019re never sure if your conservation management technique that you set up 20 years ago is as efficient in the current climate today as it was then,\u201d Nicoll said.<\/p>\n<p>\u201cYou need to adjust, if necessary, and you can\u2019t do that if you don\u2019t monitor.<\/p>\n<p>\u201d<br \/>\nFrom four birds in the mid-1970s to roughly 400 by the late 1990s according to recent estimates, the Mauritius kestrel saw its conservation status on the IUCN Red List improve from critically endangered to vulnerable.<\/p>\n<p>Now, it\u2019s down to endangered \u2014 not as dire as critically endangered, but worse than vulnerable \u2014 with scientists estimating fewer than 250 birds on the island.<\/p>\n<p>\u201cWe are basically fighting against the odds,\u201d said Vikash Tatayah, a co-author of the paper and conservation director for the Mauritian Wildlife Foundation (MWF).<\/p>\n<p>\u201cIt\u2019s actually overcoming four centuries of human presence and disturbance on the environment, which in itself is a big challenge.<\/p>\n<p>\u201d<br \/>\nAlong with ZSL and MWF, the paper also included collaborators from the Durrell Wildlife Conservation Trust, Durrell Institute of Conservation and Ecology, the Peregrine Fund and the Mauritian government.<\/p>\n<p>Funding played a large role in the success of the Mauritius kestrel effort, Tatayah said. It helped that the species is \u201cmajestic,\u201d he added, making it appealing to donors.<\/p>\n<p>But while donor money helped save the Mauritius kestrel from extinction, funds stopped flowing in after its conservation status had improved to vulnerable, preventing scientists from monitoring each population continuously.<\/p>\n<p>\u201cThe message to a funder is you have to actually support this work for decades,\u201d Tatayah told Mongabay, rather than for just a few years.<\/p>\n<p>Tatayah, a native-born Mauritian, added that the Mauritius kestrel is now the last surviving bird of prey on the island, saying it would have been a shame if it had gone extinct.<\/p>\n<p>It\u2019s also one of the last remaining natural predators in the ecosystem, Nicoll added, making it an important umbrella species: one whose conservation helps protect other species too.<\/p>\n<p>\u201cThe loss of any species is a tragedy,\u201d Tatayah said.<\/p>\n<p>\u201cBut I think when you lose a bird as iconic as a bird of prey, that is a double disaster.<\/p>\n<p>\u201d. After analyzing the data in their recent paper, researchers found that the western population declined during the monitoring hiatus. Throughout the 1990s, the population grew steadily, leading scientists to believe it would continue on that trajectory.<\/p>\n<p>But after the halt in funding prevented them from monitoring the western population for six years, the team discovered that the population wasn\u2019t doing as well as birds in the east.<\/p>\n<p>By comparing breeding performance between the populations, they found that kestrels in the west had a much lower nesting rate due to fewer nest boxes and fewer natural nest sites.<\/p>\n<p>Kestrels are more likely to make breeding attempts when nest boxes are available, Nicoll said, with two-thirds of all nesting attempts happening in nest boxes versus natural sites, like rock crevices and tree cavities.<\/p>\n<p>\u201cIt\u2019s tied into elements of life history decisions that birds make, trading off survival and investment in reproduction from one year to the next,\u201d he said.<\/p>\n<p>The nest boxes are designed to prevent long-tailed macaques (Macaca fascicularis) and small Indian mongooses (Herpestes auropunctatus) from getting inside, both of which are invasive and predate on eggs and fledglings, respectively.<\/p>\n<p>Ironically, mongooses were introduced to control invasive rats, which also prey on kestrel nests. Part of the team\u2019s management strategy is to control mongoose and feral cat (Felis catus) populations at kestrel release sites by trapping and euthanizing them.<\/p>\n<p>The kestrels also lay more eggs in nest boxes than they would in natural nest sites, leading scientists to focus their efforts on deploying \u2014 and improving \u2014 more nest boxes.<\/p>\n<p>Now, the team is working to create sturdier nest boxes made of PVC rather than wood so they last longer and weigh less, Tatayah said. It\u2019s one of several discoveries the researchers say wouldn\u2019t have been made without long-term monitoring.<\/p>\n<p>Releasing hand-fed birds into the wild isn\u2019t the one-and-done \u201cborn free\u201d moment many people might imagine. Release into the wild actually takes months, Nicoll explained, requiring careful monitoring, gradual decreases in feeding, and techniques adapted from falconry.<\/p>\n<p>For example, researchers teach the chicks to associate the sound of a whistle with feeding time. That way, when they\u2019re out in the wild, a simple blow of the whistle attracts an entire flock of hungry birds ready to sling back supper.<\/p>\n<p>Researchers feed the kestrels twice a day for two months and then reduce feeding to once a day until they are about 100 days old, Nicoll said. \u201cThat is the most amazing experience, because you\u2019ve got 26 wild kestrels all coming in and sitting in the trees around you waiting for you to dole out dinner,\u201d Nicoll said.<\/p>\n<p>\u201cIt\u2019s really cool.<\/p>\n<p>\u201d<br \/>\nWider lessons for wildlife reintroduction<br \/>\nMany of the techniques that were developed in conserving the kestrels were replicated for the recovery of other species too, Nicoll said, like the pink pigeon (Nesoenas mayeri) and echo parakeet (Psittacula eques), both also endemic to Mauritius.<\/p>\n<p>He said captive breeding of birds follows a set of basic principles, making it easy for wildlife managers to make adjustments for each species based on its particular biology, habitat and threats.<\/p>\n<p>\u201cWhat works on reptiles could well be relevant for birds. What works on birds, the same basic approaches can be relevant for mammals,\u201d Nicoll said.<\/p>\n<p>\u201cBut of course, you have to take into account the biology of the species.<\/p>\n<p>\u201d<br \/>\nScientists will often \u201chead-start\u201d a bird population by taking eggs from a recently laid clutch, which prompts a natural response called double-clutching: an evolutionary response in some birds naturally triggered by threats such as predation or storms that might destroy a nest.<\/p>\n<p>Once the researchers take the eggs from the first clutch for captive rearing, the birds will produce a second clutch of eggs, helping boost the population.<\/p>\n<p>Alison Greggor, a researcher in recovery ecology at the San Diego Zoo Wildlife Alliance, said her team uses the same technique for some of their bird reintroduction projects.<\/p>\n<p>She said the process helps ensure higher survival rates for threatened species like the critically endangered aga (Corvus kubaryi), a crow species endemic to the Mariana islands, and the \u2018alala (Corvus hawaiiensis), a crow species endemic to Hawai\u2019i that is now extinct in the wild.<\/p>\n<p>Greggor said they also conduct anti-predator training to teach the birds that predators like Hawaiian hawks (Buteo solitarius) and invasive cats are a threat.<\/p>\n<p>They do so by using alarm calls and props to simulate threats, such as a taxidermy hawk \u201cflying\u201d overhead or a cat walking below branches where the birds are perched, teaching them that danger comes from both above and below.<\/p>\n<p>\u201cWe really need to be able to prepare them [captive-reared animals] for the future that\u2019s in front of them, because the habitats that they have now may not have the same challenges that they did [in the past],\u201d Greggor said, adding that often climate impacts such as those outlined in the latest IPCC report aren\u2019t always considered for wildlife as they are for humans.<\/p>\n<p>Although the Mauritius kestrel study is focused on the tiny island nation of Mauritius, \u201cit is applicable to any bird conservation projects around the world,\u201d Tatayah said, where there\u2019s an important lesson to learn about metapopulations, or larger populations made up of several smaller populations of the same species. Just because one part of the overall population is doing well doesn\u2019t necessarily mean the rest of the population is doing well too, he said.<\/p>\n<p>Despite the kestrel\u2019s comeback over the past few decades, the species still faces a range of threats, Tatayah said: deforestation for housing, infrastructure and deer ranching for big game hunting, housing and infrastructure; invasive plants and animals; and dwindling numbers of prey like endemic day geckos due to habitat destruction.<\/p>\n<p>He said the Mauritius kestrel will be dependent on forest management and artificial nest boxes until forests can regenerate enough to provide ample natural nest sites for them.<\/p>\n<p>His takeaway from the study: \u201cDon\u2019t take your eyes off the ball. \u201d<br \/>\nEven when a species\u2019 conservation status improves on the IUCN Red List, the same external threats can still persist, Tatayah said, stressing the importance of detailed data.<\/p>\n<p>\u201cThe culture of conservation in Mauritius is such that you don\u2019t see failure as failure,\u201d Nicoll said.<\/p>\n<p>\u201cYou see failure as a lesson learned.<\/p>\n<p>\u201d<br \/>\nCitations:<br \/>\nNicoll, M. A. , Jones, C. G. , Groombridge, J. G. , Henshaw, S. , Ruhomaun, K. , Tatayah, V. , \u2026 Norris, K.<\/p>\n<p>Contrasting recovery trajectories of four reintroduced populations of the Endangered Mauritius Kestrel (Falco punctatus). Ibis. doi:10.1111\/ibi.12987<br \/>\nJones, C.<\/p>\n<p>G. , Heck, W. , Lewis, R. E. , Mungroo, Y. , Slade, G. , &amp; Cade, T. O. M. (1995). The restoration of the Mauritius kestrel Falco punctatus population.<\/p>\n<p>Ibis, 137, S173-S180. doi: 10.1111\/j.1474-919x.1995. tb08439. x<br \/>\nJones, C. G. , Burgess, M. D. , Groombridge, J. J. , Dale, R. , Tatayah, V. , Zuel, N.<\/p>\n<p>&amp; Nicoll, M. A. C. (2013). Mauritius Kestrel Falco punctatus. In Safford, R. J. &amp; Hawkins, A. F. A. (eds) The Birds of Africa.<\/p>\n<p>Volume VIII: The Malagasy Region, 300-306. London: Christopher Helm. Berger-Tal, O. , Blumstein, D. T. , &amp; Swaisgood, R. R. (2020). Conservation translocations: A review of common difficulties and promising directions.<\/p>\n<p>Animal Conservation, 23(2), 121-131. doi:10.1111\/acv.12534<br \/>\nSoorae, P. S. (ed. ) (2018). Global Reintroduction Perspectives: 2018. Case studies from around the globe.<\/p>\n<p>IUCN\/SSC Reintroduction Specialist Group, Gland, Switzerland, and Environment Agency, Abu Dhabi, UAE. Banner image: A Mauritius kestrel in a tree cavity. Image courtesy of Malcolm Nicoll \/ ZSL\/IOZ.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Mauritius. Using decades of data, a recent study analyzed long-term population trends for the Mauritius kestrel, a bird of prey endemic to the island of Mauritius, which was once considered the rarest bird in the world. While an intensive recovery program for the kestrel helped increase the population to an estimated 400 individuals [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":3551,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,8,9,16],"tags":[233,245,241,645],"class_list":["post-3552","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-all-news","category-homepage-english","category-miscellaneous","category-twitter","tag-africa-press","tag-africa-press-mauritius","tag-mauritius","tag-reintroductions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What the Mauritius kestrel can teach us about wildlife reintroductions - Mauritius<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What the Mauritius kestrel can teach us about wildlife reintroductions\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; Mauritius. Using decades of data, a recent study analyzed long-term population trends for the Mauritius kestrel, a bird of prey endemic to the island of Mauritius, which was once considered the rarest bird in the world. While an intensive recovery program for the kestrel helped increase the population to an estimated 400 individuals [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions\" \/>\n<meta property=\"og:site_name\" content=\"Mauritius\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/AfricaPressTunisiaa\" \/>\n<meta property=\"article:published_time\" content=\"2021-09-23T10:05:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/mauritius\/sites\/61\/2021\/09\/img-614c6a2f5208a.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"563\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditoren\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditoren\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions\"},\"author\":{\"name\":\"cfeditoren\",\"@id\":\"https:\/\/www.africa-press.net\/mauritius\/#\/schema\/person\/068c7ab4e9634ae78ec5d54ec46598bb\"},\"headline\":\"What the Mauritius kestrel can teach us about wildlife reintroductions\",\"datePublished\":\"2021-09-23T10:05:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions\"},\"wordCount\":2065,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/mauritius\/sites\/61\/2021\/09\/img-614c6a2f5208a.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Mauritius\",\"Mauritius\",\"reintroductions\"],\"articleSection\":[\"all news\",\"homepage-english\",\"miscellaneous\",\"twitter\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions\",\"url\":\"https:\/\/www.africa-press.net\/mauritius\/all-news\/what-the-mauritius-kestrel-can-teach-us-about-wildlife-reintroductions\",\"name\":\"What the Mauritius kestrel can teach us about wildlife reintroductions - 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Using decades of data, a recent study analyzed long-term population trends for the Mauritius kestrel, a bird of prey endemic to the island of Mauritius, which was once considered the rarest bird in the world. 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