{"id":2541,"date":"2019-10-28T15:28:34","date_gmt":"2019-10-28T19:28:34","guid":{"rendered":"https:\/\/mote.org\/?p=2541"},"modified":"2024-07-12T15:03:52","modified_gmt":"2024-07-12T19:03:52","slug":"coral-matchmaker-breeds-threatened-species","status":"publish","type":"post","link":"https:\/\/mote.org\/news\/coral-matchmaker-breeds-threatened-species\/","title":{"rendered":"Coral \u2018matchmaker\u2019 breeds threatened species"},"content":{"rendered":"<p>Florida\u2019s coral reefs have enough problems\u2014unprecedented levels of coral disease, climate change, pollution and hurricanes\u2014without struggling to reproduce sexually. But struggle they do.<\/p>\n<p>As environmental stress grows and coral populations shrink worldwide, coral sexual cycles are becoming disrupted and failing altogether in some locations and for some species, which has serious implications for the survival and long-term persistence of natural and restored populations. Sexual reproduction\u2014in which the DNA of gametes (sperm and eggs) from two different corals of the same species recombine through a cyclic process of spawning and fertilization\u2014provides the next generation of genetically diverse coral offspring that can replenish depleted adult populations and disperse to establish new reefs.<\/p>\n<p>Genetic diversity, powered by sex, is a safety net that promotes population resilience by providing a buffer against environmental change and the flexibility to adapt. When sexual reproduction breaks down, so does that safety net, just when corals need it most.<\/p>\n<p>Since the 1980s, coral cover has declined by approximately 80% in the Caribbean and 50% worldwide. The resulting small patchy populations have less successful spawning, fertilization and recruitment of new individuals back into the population. This is why Mote Marine Laboratory, and several other organizations, are stepping in to assist with coral sexual propagation, and why research scientists, like Dr. Hanna R. Koch, are exploring novel reproductive interventions for advancing coral restoration strategies. Koch is a Postdoctoral Research Fellow with the German Research Foundation and Visiting Research Scientist at Mote\u2019s Elizabeth Moore International Center for Coral Reef Research &amp; Restoration (IC2R3). She is collaborating with Mote scientists Dr. Erinn Muller and Erich Bartels to investigate the heritability of disease resistance and establish a managed breeding program for generating more resilient offspring for coral restoration.<\/p>\n<p>This summer, Koch took a big step forward: turning Mote\u2019s nursery-raised staghorn corals\u2014which are scientifically well studied and genetically documented\u2014into parents for a carefully managed sexual reproduction effort that will feed fresh genetics into future restoration and research. &#8220;This step, adding new genetic diversity with a new level of control, represents a critical new link in the chain of Mote\u2019s uniquely comprehensive strategy for science-based reef restoration,&#8221; said Mote President &amp; CEO Dr. Michael P. Crosby.<\/p>\n<p>\u201cNow, our one organization can do every step essential for resilient coral reef restoration, and I think this is a big deal,\u201d said Muller, Science Director for Mote\u2019s IC2R3. \u201cWe can complete the sexual reproduction steps of spawning, fertilization and larval settlement; we can grow corals out, identify individual coral genotypes (genetic varieties) and test them for resilience to multiple stressors; and we can produce more coral colonies through asexual fragmentation and outplant them to depleted reefs. Then those adult colonies can produce more offspring to start the cycle all over again.\u201d<\/p>\n<h6 style=\"text-align: center;\"><img decoding=\"async\" class=\"wp-image-12246 aligncenter lazyload\" data-src=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/koch_bmvol-265x300.jpg\" alt=\"\" width=\"312\" height=\"353\" data-srcset=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/koch_bmvol-265x300.jpg 265w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/koch_bmvol-906x1024.jpg 906w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/koch_bmvol-768x868.jpg 768w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/koch_bmvol-1359x1536.jpg 1359w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/koch_bmvol-1812x2048.jpg 1812w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/koch_bmvol.jpg 1911w\" data-sizes=\"(max-width: 312px) 100vw, 312px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 312px; --smush-placeholder-aspect-ratio: 312\/353;\" \/><img decoding=\"async\" data-src=\"https:\/\/mote.org\/media\/uploads\/images\/koch_bmvol.jpg\" alt=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" \/><br \/>\nPhoto: Dr. Hanna Koch and colleagues are raising diverse corals for reef restoration through managed breeding. Credit: Dr. Hanna Koch<\/h6>\n<h5><strong>Preparing corals for their big day<\/strong><\/h5>\n<h6><img decoding=\"async\" data-src=\"https:\/\/mote.org\/media\/uploads\/images\/Bringing_corals_from_spawning_nursery_to_IC2R3_-_credit_Dr._Hanna_Koch.JPG\" alt=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" \/><img decoding=\"async\" class=\"size-medium wp-image-12242 aligncenter lazyload\" data-src=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/Bringing_corals_from_spawning_nursery_to_IC2R3_-_credit_Dr._Hanna_Koch-300x225.jpeg\" alt=\"\" width=\"300\" height=\"225\" data-srcset=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/Bringing_corals_from_spawning_nursery_to_IC2R3_-_credit_Dr._Hanna_Koch-300x225.jpeg 300w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/Bringing_corals_from_spawning_nursery_to_IC2R3_-_credit_Dr._Hanna_Koch-1024x768.jpeg 1024w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/Bringing_corals_from_spawning_nursery_to_IC2R3_-_credit_Dr._Hanna_Koch-768x576.jpeg 768w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/Bringing_corals_from_spawning_nursery_to_IC2R3_-_credit_Dr._Hanna_Koch-1536x1152.jpeg 1536w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/Bringing_corals_from_spawning_nursery_to_IC2R3_-_credit_Dr._Hanna_Koch-2048x1536.jpeg 2048w\" data-sizes=\"(max-width: 300px) 100vw, 300px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 300px; --smush-placeholder-aspect-ratio: 300\/225;\" \/><\/h6>\n<h6 style=\"text-align: center;\">Photo: Staghorn corals are collected from Mote&#8217;s spawning nursery. Credit Dr. Hanna Koch<\/h6>\n<p>In spring 2019, Koch and partners laid the groundwork for their managed sexual reproduction effort using staghorn coral (<em>Acropora cervicornis<\/em>), a species whose populations have declined 95% in the past 40 years due to whiteband disease, high ocean temperatures and other stressors. Now listed as Threatened under the U.S. Endangered Species Act, staghorn coral is one of several focal species of Mote\u2019s research and restoration programs that have raised and documented numerous staghorn genotypes with varying traits. In April, Koch, joined by Bartels and intern Allyson DeMerlis, set up Mote\u2019s first coral spawning nursery within Bartel\u2019s staghorn restoration nursery off Looe Key. The team modified the coral \u201ctrees\u201d\u2014that usually hold small coral fragments being propagated asexually\u2014to hold larger colonies. Colony size, not age, determines sexual maturity: when these hermaphroditic corals produce both male and female gametes.<\/p>\n<p>In July 2019, Koch and DeMerlis sampled their corals and found that half contained developing gametes\u2014a better percentage than typically seen on stressed, wild reefs. For this reason, Koch said, \u201cspawning nurseries have the potential to provide greater and more reliable access to coral spawn that can be used for research and restoration.\u201d She added, \u201cWe grew these sexually mature colonies from large fragments in less than a year in this nursery, which speeds up progress significantly for this type of work\u2014especially since wild or outplanted corals may need two or more years.\u201d<\/p>\n<h5><strong>Romantic sunsets and moonlit nights<\/strong><\/h5>\n<h6><img decoding=\"async\" class=\"wp-image-12249 aligncenter lazyload\" data-src=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/spawning_colony-300x229.jpg\" alt=\"\" width=\"423\" height=\"323\" data-srcset=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/spawning_colony-300x229.jpg 300w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/spawning_colony-1024x782.jpg 1024w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/spawning_colony-768x587.jpg 768w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/spawning_colony-1536x1173.jpg 1536w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/spawning_colony.jpg 1800w\" data-sizes=\"(max-width: 423px) 100vw, 423px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 423px; --smush-placeholder-aspect-ratio: 423\/323;\" \/><strong><img decoding=\"async\" data-src=\"https:\/\/mote.org\/media\/uploads\/images\/spawning_colony.jpg\" alt=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" \/><\/strong><\/h6>\n<h6 style=\"text-align: center;\">Photo: A spawning staghorn coral releases gametes that will fuse with gametes from a genetically distinct staghorn coral in the process of sexual reproduction. Credit: Dr. Hanna Koch<\/h6>\n<p>Humans aren\u2019t the only ones who get a bit amorous under the full moon. Staghorn corals spawn at night, primarily two to six days after the August full moon. To prevent field operations being disrupted by unpredictable weather, Koch and Mote staff brought 62 nursery-raised staghorn corals into outdoor tanks at IC2R3 and provided the sunset and moonlight cues needed for spawning.<\/p>\n<p>Koch and her team spent eight long nights on spawning duty, wearing full-body clothing to protect against mosquitoes, as bug spray and other chemicals aren\u2019t allowed around sensitive coral gametes. They used red lights to watch for corals \u201csetting\u201d\u2014where gamete bundles are moved into position for release, a helpful signal that spawning is imminent.<\/p>\n<h5><strong>Little bundles of joy<\/strong><\/h5>\n<p><strong><img decoding=\"async\" data-src=\"https:\/\/mote.org\/media\/uploads\/images\/fertilized_and_unfertilized_eggs.JPG\" alt=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" \/><\/strong><\/p>\n<h6 style=\"text-align: center;\"><img decoding=\"async\" class=\"wp-image-12245 aligncenter lazyload\" data-src=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/fertilized_and_unfertilized_eggs-300x225.jpeg\" alt=\"\" width=\"405\" height=\"304\" data-srcset=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/fertilized_and_unfertilized_eggs-300x225.jpeg 300w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/fertilized_and_unfertilized_eggs-1024x768.jpeg 1024w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/fertilized_and_unfertilized_eggs-768x576.jpeg 768w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/fertilized_and_unfertilized_eggs-1536x1152.jpeg 1536w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/fertilized_and_unfertilized_eggs-2048x1536.jpeg 2048w\" data-sizes=\"(max-width: 405px) 100vw, 405px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 405px; --smush-placeholder-aspect-ratio: 405\/304;\" \/>Developing coral embryos look like irregular &#8220;blobs&#8221; compared with the round, unfertilized eggs. Credit: Dr. Hanna Koch<\/h6>\n<p>Of 62 coral colonies, nine colonies of four genotypes spawned. \u201cI was very pleased with the results, as these colonies were relatively small and first-timers; this initial spawning behavior data is crucial to developing a successful breeding regime,\u201d Koch said. \u201cInterestingly, the genotypes that are whiteband disease resistant did not spawn during the predicted window, indicating more research is needed to understand why,\u201d she added.<\/p>\n<p>Fortunately, certain coral colonies released their gametes with enough synchrony (similar timing) to allow breeding between genetically different parents. Corals must spawn on the same night to combine their sperm and eggs, which are only viable for a few hours. However, coral spawning synchrony is declining in the wild as populations and environmental conditions become degraded. The team collected the gamete bundles and allowed them to break up in the lab, releasing sperm and eggs. Then they combined eggs and sperm from genetically different parents\u2014cross fertilization\u2014to produce diverse offspring. Breeding success between two corals can vary depending on which parent provided the sperm and which provided the egg, so Koch allowed each coral in a pair to be mom, then dad.<\/p>\n<p>The next day, the team gazed through their microscope to spot developing embryos\u2014irregular blobs distinct from the round, unfertilized eggs. \u201cFertilization rates were quite high, with one batch reaching 50% and the other 80%!\u201d Koch said.<\/p>\n<h5><strong>Growing and glowing<\/strong><\/h5>\n<p><strong><img decoding=\"async\" data-src=\"https:\/\/mote.org\/media\/uploads\/files\/13e_x_15s_FL_ACER_15_8_28_bmvol.jpg\" alt=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" \/><img decoding=\"async\" class=\"wp-image-12240 aligncenter lazyload\" data-src=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/13e_x_15s_FL_ACER_15_8_28_bmvol-300x241.jpg\" alt=\"\" width=\"396\" height=\"318\" data-srcset=\"https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/13e_x_15s_FL_ACER_15_8_28_bmvol-300x241.jpg 300w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/13e_x_15s_FL_ACER_15_8_28_bmvol-1024x821.jpg 1024w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/13e_x_15s_FL_ACER_15_8_28_bmvol-768x616.jpg 768w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/13e_x_15s_FL_ACER_15_8_28_bmvol-1536x1232.jpg 1536w, https:\/\/mote.org\/wp-content\/uploads\/2019\/10\/13e_x_15s_FL_ACER_15_8_28_bmvol.jpg 1579w\" data-sizes=\"(max-width: 396px) 100vw, 396px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 396px; --smush-placeholder-aspect-ratio: 396\/318;\" \/><\/strong><\/p>\n<h6 style=\"text-align: center;\">&#8220;Baby&#8221; corals naturally fluoresce under blue lights. Credit: Dr. Hanna Koch<\/h6>\n<p>Within a few days, Mote\u2019s staghorn coral babies had developed into larvae, which Koch settled on ceramic plugs. By Sept. 1, Koch had 50% settlement and was raising 200 coral settlers, also called sexual recruits, which will add fresh genetics to Mote\u2019s staghorn restoration and research efforts. Each settled larva develops into a coral polyp\u2014one of many that will ultimately form the coral colony. Polyps start out transparent and later gain color from special algae that enter their tissues and play a critical role in their survival.<\/p>\n<p>New recruits are hard to see, but Koch uses blue light to detect fluorescence naturally emitted by the coral. \u201cI\u2019m using this method for more quickly identifying and more accurately quantifying microscopic sexual recruits,\u201d she said. \u201cFluorescence starts during the larval stage, and this natural ability helps researchers in many ways, in addition to being absolutely beautiful!\u201d<\/p>\n<p>These glowing coral babies represent the possibility of a brighter future of restored reefs in the wild, and they\u2019re the latest reminder that Mote\u2019s coral science and restoration\u2014newly strengthened through managed breeding\u2014are a match made in heaven.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Florida\u2019s coral reefs have enough problems\u2014unprecedented levels of coral disease, climate change, pollution and hurricanes\u2014without struggling to reproduce sexually. But struggle they do. As environmental stress grows and coral populations&nbsp;<span class=\"ellipsis\">&hellip;<\/span><\/p>\n","protected":false},"author":3,"featured_media":2542,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,19],"tags":[207,205,351,51,347,353,354,299,352,349],"class_list":["post-2541","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mote-news","category-research","tag-coral-health","tag-coral-reef-research","tag-coral-reproduction","tag-coral-restoration","tag-dr-erinn-muller","tag-dr-hanna-koch","tag-erich-bartels","tag-florida-keys","tag-ic2r3","tag-islamorada"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Coral \u2018matchmaker\u2019 breeds threatened species | Mote Marine Laboratory &amp; Aquarium<\/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:\/\/mote.org\/news\/coral-matchmaker-breeds-threatened-species\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Coral \u2018matchmaker\u2019 breeds threatened species | Mote Marine Laboratory &amp; Aquarium\" \/>\n<meta property=\"og:description\" content=\"Florida\u2019s coral reefs have enough problems\u2014unprecedented levels of coral disease, climate change, pollution and hurricanes\u2014without struggling to reproduce sexually. But struggle they do. 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