{"id":37691,"date":"2023-02-27T08:00:18","date_gmt":"2023-02-27T12:00:18","guid":{"rendered":"https:\/\/www.fondriest.com\/news\/?p=37691"},"modified":"2025-10-07T09:34:26","modified_gmt":"2025-10-07T13:34:26","slug":"the-eastern-hellbender-north-americas-largest-salamander-may-be-in-trouble","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/the-eastern-hellbender-north-americas-largest-salamander-may-be-in-trouble.htm","title":{"rendered":"The Eastern Hellbender: North America\u2019s Largest Salamander May Be In Trouble"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The Eastern Hellbender is a fully aquatic salamander species that inhabits the rivers and streams of the Appalachian region of the U.S. It is the largest salamander in North America, with an average length of 12-20 inches\u2013however, they can grow up to 30 inches and weigh as much as 4 pounds. Eastern Hellbenders are identifiable by their large, flattened head and small but widely separated eyes. They are often brown in color but can be gray, yellowish brown and even black.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Rebecca O\u2019Brien, a Ph.D. candidate at Virginia Tech, did not originally plan on studying these amphibians for her doctorate. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cI just saw this listing when I was looking for graduate positions. And I didn&#8217;t know much about Hellbenders at the time so I started looking into it. Evolutionarily, they\u2019re a really unique species,\u201d she explains. O\u2019Brien learned that Eastern Hellbenders display unusual parental care behavior, which inspired her to learn more about this distinctive species.<\/span><\/p>\n<h3><span style=\"color: #808080;\" data-darkreader-inline-color=\"\">Observing Hellbender Parental Care<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Hellbenders are difficult to study during their reproductive season because they spend most of their time underwater and nestled under large rocks at the bottom of rivers and streams. What is known, however, is that male hellbenders will stake out and create nests under these large rocks. Afterward, females will lay eggs, and the males will fertilize the eggs and stay with them until the following spring, according to the <\/span><a href=\"https:\/\/dwr.virginia.gov\/wildlife\/information\/eastern-hellbender\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Virginia Department of Wildlife Resources.<\/span><\/a><\/p>\n<p><span style=\"font-weight: 400;\">To get around the challenge of observing hellbenders during their mating cycle, O\u2019Brien and her colleagues have been using artificial habitats to observe these amphibians in an environment that attempts to replicate their natural nests.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cIt&#8217;s a square chamber with a long tunnel coming off one corner. So they have this easily defendable space where they can hang out,\u201d O\u2019Brien describes. \u201cWhat I was working on was taking one of those shelters and making it much taller, and then putting a camera in the roof so that we could film the behaviors going on.\u201d <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Although she initially worried that the hellbenders wouldn\u2019t like their new, larger dens, they responded well, and this allowed O\u2019Brien to observe them like never before.<\/span><\/p>\n<div id=\"attachment_37697\" style=\"width: 550px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-37697\" class=\"wp-image-37697 \" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2023\/02\/Hellbender_IMG_E2924-scaled-e1677444736874.jpg\" alt=\"A PVC pipe with a measuring tape glued inside is used to measure the length of each animal.\" width=\"540\" height=\"572\" \/><p id=\"caption-attachment-37697\" class=\"wp-caption-text\"><span style=\"color: #808080;\" data-darkreader-inline-color=\"\">A PVC pipe with a measuring tape glued inside is used to measure the length of each animal. (Credit: Rebecca O\u2019Brien)<\/span><\/p><\/div>\n<h3><span style=\"color: #808080;\" data-darkreader-inline-color=\"\">Does Water Quality Impact Eastern Hellbender Egg Health?<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">O\u2019Brien is observing eastern hellbenders during their reproductive cycles to understand how changes in water quality are influencing parental care behavior. According to O&#8217;Brien, one of the biggest threats to hellbenders is their declining <\/span><a href=\"https:\/\/www.fishsens.com\/northeast-cod-fishing-closure-is-the-largest-in-u-s-cod-management-history\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">recruitment<\/span><\/a><span style=\"font-weight: 400;\">, with parental care being vital to the recruitment of young hellbenders.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As water temperature rises, dissolved oxygen levels in that system decline, and because hellbender eggs rely on diffusion for their oxygen, this could cause problems for the eggs. O\u2019Brien is interested in how male parental care behaviors influence this process.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cHellbender dads have the potential to either compensate for the declining dissolved oxygen through their parental care behaviors. or to not do anything,\u201d O\u2019Brien explains. \u201cMaybe as dissolved oxygen levels get lower, they spend so much time taking care of themselves that they spend less time taking care of their eggs.\u201d\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">O\u2019Brien described how eastern hellbender males are known to move their tails in a fanning motion to help buffer eggs against <\/span><a href=\"https:\/\/www.lakescientist.com\/research-brief-characterizing-and-understanding-hypoxia-in-the-laurentian-great-lakes\/\"><span style=\"font-weight: 400;\">hypoxic conditions<\/span><\/a><span style=\"font-weight: 400;\">. However, it is possible that conditions become bad enough that the males may instead revert to behavior that pushes fresh water across their own skin, creating a positive feedback loop that will only provide less oxygen to the eggs.<\/span><\/p>\n<h3><span style=\"color: #808080;\" data-darkreader-inline-color=\"\">Eastern Hellbender <\/span><span style=\"color: #808080;\" data-darkreader-inline-color=\"\">Population Concerns<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Although the explanation for less recruitment is still not certain, eastern hellbenders are still suffering. The eastern hellbender is listed as endangered in some states, such as Missouri, Ohio, and Alabama. With the difficulty that comes with studying eastern hellbenders in the wild, they are not yet listed as endangered in all states where their populations are thought to be declining, according to the <\/span><a href=\"https:\/\/www.dec.ny.gov\/animals\/7160.html\"><span style=\"font-weight: 400;\">New York Department of Environmental Conservation.<\/span><\/a><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Along with low dissolved oxygen levels, another issue facing hellbenders in regard to water quality is siltation. \u201cHellbender larvae depend on these really small spaces in between the gravel and small rocks on the bottom of the creek,\u201d says O\u2019Brien. \u201cSo if you get a bunch of silt that comes in and fills in all those little spots, there&#8217;s nowhere for them to go.\u201d\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Clearing riparian zones along creeks and rivers can be a cause of both of these issues. O\u2019Brien explains that the erosion caused by less vegetation can lead to increasing amounts of sediment entering the water from stormwater runoff. Moreover, reducing the amount of shade a creek receives only perpetuates rises in water temperature and a decline of dissolved oxygen.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cIf you get enough siltation, even the big crevices that the adults depend on can get filled in, and then they don&#8217;t have anywhere to hide,\u201d O\u2019Brien explained, also adding, \u201cThese guys are so big, that they need high oxygen concentrations in their streams to survive.\u201d<\/span><\/p>\n<div id=\"attachment_37698\" style=\"width: 550px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-37698\" class=\"wp-image-37698 \" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2023\/02\/Hellbender_IMG_9418-1-scaled-e1677444801766.jpg\" alt=\"Researcher (Rebecca O'Brien) holding an Eastern Hellbender to measure its size and health\" width=\"540\" height=\"596\" \/><p id=\"caption-attachment-37698\" class=\"wp-caption-text\"><span style=\"color: #808080;\" data-darkreader-inline-color=\"\">The animals are brought to the bank to measure their size and assess their health three times during the breeding season. (Credit: Jordy Groffen)<\/span><\/p><\/div>\n<h3><span style=\"color: #808080;\" data-darkreader-inline-color=\"\">Implementing Discoveries<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">O\u2019Brien believes that the public plays a large role in helping to drive progress in ecological conservation. Land managers, companies and everyday people can play a key role in the connection between scientific discovery and the implementation of that work in the real world.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cIt&#8217;s a lot of learning what people value and tapping into their local norms and learning either how to work within those norms to shift people&#8217;s approaches towards how they manage their property or to figure out ways to shift those norms,\u201d says O\u2019Brien. \u201cWorking on private lands enable more conservation work, but it&#8217;s hard.\u201d<\/span><\/p>\n<h3><span style=\"color: #808080;\" data-darkreader-inline-color=\"\">Conclusion<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The declining population of eastern hellbenders offers insight into how declining water quality can have a severe effect on the populations of river-dwelling species. Small changes in aquatic ecosystems can have cascading effects, but <\/span><a href=\"https:\/\/www.fondriest.com\/news\/health-resilience-and-stewardship-in-the-hudson-river-preventing-and-responding-to-climate-emergencies.htm\"><span style=\"font-weight: 400;\">work across the country<\/span><\/a><span style=\"font-weight: 400;\"> is being done to monitor and improve water quality for the benefit of all the humans, plants and animals that need it to survive.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Despite the challenges facing conservation efforts, O\u2019Brien remains optimistic about the future, \u201cI think it&#8217;s so important to pay attention to the success stories that are out there. Because they are out there. Everywhere.\u201d<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Eastern Hellbenders, the largest salamanders in North America, exhibit unique parental care&#8211;declining water quality is putting them at risk.<\/p>\n","protected":false},"author":48,"featured_media":37707,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[458,7,49],"tags":[2447,60,2449,2448,483],"class_list":["post-37691","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fish-science","category-news","category-rivers-streams","tag-eastern-hellbender","tag-featured","tag-nydec","tag-salamander","tag-virginia-tech"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Eastern Hellbender: North America\u2019s Largest Salamander May Be In Trouble<\/title>\n<meta name=\"description\" content=\"Eastern Hellbenders, the largest salamanders in North America, exhibit unique parental care--declining water quality is putting them at risk.\" \/>\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.fondriest.com\/news\/the-eastern-hellbender-north-americas-largest-salamander-may-be-in-trouble.htm\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Eastern Hellbender: North America\u2019s Largest Salamander May Be In Trouble\" \/>\n<meta property=\"og:description\" content=\"Eastern Hellbenders, the largest salamanders in North America, exhibit unique parental care--declining water quality is putting them at risk.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fondriest.com\/news\/the-eastern-hellbender-north-americas-largest-salamander-may-be-in-trouble.htm\" \/>\n<meta property=\"og:site_name\" content=\"Environmental Monitor\" \/>\n<meta property=\"article:published_time\" content=\"2023-02-27T12:00:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-07T13:34:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2023\/02\/Hellbender_Hellbender-leeches_ForWeb_cropped.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"940\" \/>\n\t<meta property=\"og:image:height\" content=\"1038\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Sam Norton\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sam Norton\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/the-eastern-hellbender-north-americas-largest-salamander-may-be-in-trouble.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/the-eastern-hellbender-north-americas-largest-salamander-may-be-in-trouble.htm\"},\"author\":{\"name\":\"Sam Norton\",\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/#\\\/schema\\\/person\\\/8b594a2654ef33b01e98456d99a980ef\"},\"headline\":\"The Eastern Hellbender: North America\u2019s Largest Salamander May Be In Trouble\",\"datePublished\":\"2023-02-27T12:00:18+00:00\",\"dateModified\":\"2025-10-07T13:34:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/the-eastern-hellbender-north-americas-largest-salamander-may-be-in-trouble.htm\"},\"wordCount\":1102,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/the-eastern-hellbender-north-americas-largest-salamander-may-be-in-trouble.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/news.fondriest.com\\\/wp-content\\\/uploads\\\/2023\\\/02\\\/Hellbender_Hellbender-leeches_ForWeb_cropped.jpg\",\"keywords\":[\"Eastern Hellbender\",\"featured\",\"NYDEC\",\"salamander\",\"Virginia Tech\"],\"articleSection\":[\"Fish Science\",\"News\",\"Rivers &amp; 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