{"id":1808,"date":"2025-01-28T15:26:11","date_gmt":"2025-01-28T15:26:11","guid":{"rendered":"https:\/\/improveaquaticlife.se\/alster-river\/"},"modified":"2025-06-25T10:28:16","modified_gmt":"2025-06-25T10:28:16","slug":"alster-river","status":"publish","type":"page","link":"https:\/\/improveaquaticlife.se\/en\/alster-river\/","title":{"rendered":"River Alster\u00e5n"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_section background_position=&#8221;center center&#8221; css=&#8221;.vc_custom_1739286196120{background-image: url(https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/backdrop_projekt.jpg?id=1219) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}&#8221; el_name=&#8221;Sidhuvud&#8221;][vc_row][vc_column]    <div class=\"ia-pagehero\">\n      <div class=\"ia-pagehero__inner\">\n                <h1 class=\"ia-pagehero__title\">River Alster\u00e5n<\/h1>\n              <\/div>\n    <\/div>\n    [\/vc_column][\/vc_row][\/vc_section][vc_section css=&#8221;.vc_custom_1739286221218{background-color: linear-gradient(to top, transparent 0%, #faf6eb 100%) !important;}&#8221; el_name=&#8221;Projekt sammanfattning&#8221;][vc_row][vc_column width=&#8221;1\/2&#8243;]<figure class=\"ia-figure\"><img width=\"1958\" height=\"1224\" src=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2021\/06\/inlagg_4.jpg\" class=\"ia-figure__img\" alt=\"De unga laxarna f\u00e5r en b\u00e4ttre start p\u00e5 livet efter \u00e5tg\u00e4rderna\" sizes=\"auto, (max-width: 767px) 100vw, (max-width: 1240px) 50vw, 640px\" loading=\"lazy\" fetchpriority=\"auto\" decoding=\"async\" data-no-lazy=\"\" srcset=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2021\/06\/inlagg_4.jpg 1958w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2021\/06\/inlagg_4-768x480.jpg 768w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2021\/06\/inlagg_4-1536x960.jpg 1536w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2021\/06\/inlagg_4-1152x720.jpg 1152w\" \/><figcaption>The young salmon get a better start in life after the measures.\nPhoto: Mathias Arnham.<\/figcaption><\/figure>[\/vc_column][vc_column width=&#8221;1\/12&#8243;][\/vc_column][vc_column width=&#8221;5\/12&#8243;]    <header class=\"ia-head ia-head--left\">\n      <h2 class=\"ia-head__title\">Measures against water scarcity, for flora and fauna<\/h2>      <div class=\"ia-head__lead\"><p>River Alster\u00e5n flows through a varied landscape of coniferous forests, wetlands, agricultural landscapes and deciduous forests before entering into the Baltic Sea at Pataholm. It contains unique biotopes, such as oligotrophic wetlands, and many important species, such as salmon, bullhead, otters and hair cap moss.<br \/>\nThis project will focus on improving the ecological and hydrological status of River Alster\u00e5n, by removing migration barriers, restoring habitats and wetlands. Reeds will be removed and reefs will be built in the coastal area to benefit predatory fish. The aim is to improve water quality, increase biodiversity and habitats for protected species, and reduce the risk of drought.<\/p>\n<\/div>    <\/header>\n    [\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/4&#8243;]    <div class=\"ia-stat\">\n      <span class=\"ia-stat__icon\"><i class=\"fa-solid fa-arrows-alt-h\" aria-hidden=\"true\"><\/i><\/span>      <div class=\"ia-stat__num\"><span data-ia-count=\"125\">125<\/span><\/div>\n      <div class=\"ia-stat__label\">kilometer long<\/div>\n    <\/div>\n    [\/vc_column][vc_column width=&#8221;1\/4&#8243;]    <div class=\"ia-stat\">\n      <span class=\"ia-stat__icon\"><i class=\"fa-solid fa-expand-arrows-alt\" aria-hidden=\"true\"><\/i><\/span>      <div class=\"ia-stat__num\"><span data-ia-count=\"1525\">1,525<\/span><\/div>\n      <div class=\"ia-stat__label\">km\u00b2 large catchment area<\/div>\n    <\/div>\n    [\/vc_column][vc_column width=&#8221;1\/4&#8243;]    <div class=\"ia-stat\">\n      <span class=\"ia-stat__icon\"><i class=\"fa-solid fa-water\" aria-hidden=\"true\"><\/i><\/span>      <div class=\"ia-stat__num\"><span data-ia-count=\"23\">23<\/span><\/div>\n      <div class=\"ia-stat__label\">the number of hectares of wetland restored<\/div>\n    <\/div>\n    [\/vc_column][vc_column width=&#8221;1\/4&#8243;]    <div class=\"ia-stat\">\n      <span class=\"ia-stat__icon\"><i class=\"fa-solid fa-fish\" aria-hidden=\"true\"><\/i><\/span>      <div class=\"ia-stat__num\"><span data-ia-count=\"18\">18<\/span><\/div>\n      <div class=\"ia-stat__label\">the number of fish species detected<\/div>\n    <\/div>\n    [\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]River Alster\u00e5n is a 125 km long river in south-eastern Sweden with a catchment area of 1 525 km\u00b2. It is one of Kalmar County&#8217;s most valuable rivers and is a Natura 2000 site in its full length within the county.<\/p>\n<p>From its source, Lake Alstern, River Alster\u00e5n flows through varied terrain in two branches before reaching Lake Allgunnen, one of Sweden&#8217;s largest unregulated lakes. From Allgunnen, the water flows on through three outlets that join further downstream before the river enters into the Baltic Sea at Pataholm in Kalmarsund. The upper part of River Alster\u00e5n is dominated by coniferous forest and marshland, while the lower parts are characterized by farmland and deciduous forest. River Alster\u00e5n also passes wetlands and swamp forests on its way to the sea.<\/p>\n<p><strong>Biological values and threatened species<br \/>\n<\/strong>River Alster\u00e5n has high nature values thanks to its varied habitats. It is an important spawning ground for salmon and trout, but other species such as eel, sea lamprey, catfish, spined loach and bullhead are also present. In total, around 18 fish species have been reported in the river. However, salmon populations are in decline, making salmon a priority species in the management of the Natura 2000 sites.<\/p>\n<p>River Alster\u00e5n has a rich benthic fauna with rare and endangered species and significant flora and fauna. Birds associated with the aquatic environments include osprey, silver tern, white-tailed eagle and kingfisher. Another priority species under the EU Habitats Directive is the otter, which has declined drastically since the 1950s but is now recovering.<\/p>\n<p>The Alster\u00e5n estuary and the coastal areas of Kalmarsund are also part of the Natura 2000 site. These brackish water environments are rich in flora and support predatory fish species such as sea trout, pike and perch. The coastal ecosystems of Kalmarsund and the Alster\u00e5n estuary are affected by eutrophication and the populations of pike and perch are on a downward trend.<\/p>\n<blockquote><p>The river has a rich benthic fauna with rare and endangered species and significant flora and fauna.<\/p><\/blockquote>\n<p><strong>Environmental impacts and restoration needs<\/strong><br \/>\nFor a long time, River Alster\u00e5n was used for timber rafting, which led to the clearing of boulders and changes in the bottom substrate and hydrology. The river has also been dammed for mills and hydropower, and large wetlands have been drained, negatively affecting water flow.<\/p>\n<p>During the 1970s, water quality deteriorated due to acidification. However, the situation has improved through reduced acidification and extensive liming efforts. Nevertheless, according to the EU Water Framework Directive, River Alster\u00e5n has only a moderate ecological status due to a lack of connectivity, altered morphology and recurrent summer water shortages, which negatively affect ecosystems.<\/p>\n<p><strong>Restoration actions<\/strong><br \/>\nAccording to the Natura 2000 management plan, measures to ensure free migration, successful spawning and functioning hydrology are priorities. Within the Improve Aquatic LIFE project, a migration barrier will be removed, opening up 3 kilometers of the river. Habitatrestoration will be carried out on about 1 300 meters to restore habitats for plants and animals. About 23 hectares of wetland will be restored to improve the natural hydrology downstream. Measures will also be implemented in the coastal area to improve spawning and nursery conditions for predatory fish such as pike and perch.<\/p>\n<p>The measures will improve connectivity, hydrology, water quality, biodiversity and fish production, as well as benefit the Natura 2000 species salmon, byllhead and spined loach. They will also strengthen the stocks of the typical species lamprey, chub and minnow and help reduce the risk of drought.[\/vc_column_text][\/vc_column][\/vc_row][\/vc_section][vc_section disable_element=&#8221;yes&#8221; el_name=&#8221;Projektf\u00f6rfarande&#8221;][vc_row][vc_column width=&#8221;1\/2&#8243;]<p class=\"ia-eyebrow\">Restoration of xxx<\/p>    <header class=\"ia-head ia-head--left\">\n      <h2 class=\"ia-head__title\">Here we are now<\/h2>      <div class=\"ia-head__lead\"><p>Fusce augue nibh, rhoncus quis mattis et, aliquam sit amet lorem. Sed neque dui, facilisis et luctus nec, molestie at orci. Suspendisse vel consequat lectus.<\/p>\n<\/div>    <\/header>\n        <div class=\"ia-progress\" role=\"group\" aria-label=\"This is how many of the project&#039;s eelgrass seedlings have been planted\">\n      <div class=\"ia-progress__top\"><span class=\"ia-progress__label\">This is how many of the project&#039;s eelgrass seedlings have been planted<\/span><strong class=\"ia-progress__val\">5&nbsp;%<\/strong><\/div>\n      <div class=\"ia-progress__track\"><span class=\"ia-progress__bar\" style=\"--w:5%\"><\/span><\/div>\n    <\/div>\n        <div class=\"ia-progress\" role=\"group\" aria-label=\"This is how much of the project&#039;s artificial reef has been placed\">\n      <div class=\"ia-progress__top\"><span class=\"ia-progress__label\">This is how much of the project&#039;s artificial reef has been placed<\/span><strong class=\"ia-progress__val\">89&nbsp;%<\/strong><\/div>\n      <div class=\"ia-progress__track\"><span class=\"ia-progress__bar\" style=\"--w:89%\"><\/span><\/div>\n    <\/div>\n    [\/vc_column][vc_column width=&#8221;1\/2&#8243;]<figure class=\"ia-figure\"><img width=\"1958\" height=\"1224\" src=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/algrasplantor.jpg\" class=\"ia-figure__img\" alt=\"\u00c5lgr\u00e4splantor vajar i vattnet.\" sizes=\"auto, (max-width: 767px) 100vw, (max-width: 1240px) 50vw, 640px\" loading=\"lazy\" fetchpriority=\"auto\" decoding=\"async\" data-no-lazy=\"\" srcset=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/algrasplantor.jpg 1958w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/algrasplantor-768x480.jpg 768w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/algrasplantor-1536x960.jpg 1536w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/algrasplantor-1152x720.jpg 1152w\" \/><figcaption>Eelgrass beds are important underwater habitats for fish and other animals.  \nPhoto: Henrik M\u00f6ller<\/figcaption><\/figure>[\/vc_column][\/vc_row][\/vc_section][vc_section background_position=&#8221;center bottom&#8221; css=&#8221;.vc_custom_1737973344880{background-image: url(https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/bubbles-230014.webp?id=1417) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}&#8221; el_name=&#8221;F\u00f6re och efter&#8221;][vc_row][vc_column width=&#8221;1\/2&#8243;]    <div class=\"ia-compare\" style=\"--pos:50%\">\n      <div class=\"ia-compare__after\"><img width=\"1200\" height=\"750\" src=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/faunapassage_1200.jpg\" class=\"ia-compare__img\" alt=\"Faunapassage\" sizes=\"auto, (max-width: 767px) 100vw, 640px\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/faunapassage_1200.jpg 1200w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/faunapassage_1200-768x480.jpg 768w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/faunapassage_1200-1152x720.jpg 1152w\" \/><\/div>\n      <div class=\"ia-compare__before\"><img width=\"1200\" height=\"750\" src=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/navea_damm.jpg\" class=\"ia-compare__img\" alt=\"Vandringshinder\" sizes=\"auto, (max-width: 767px) 100vw, 640px\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/navea_damm.jpg 1200w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/navea_damm-768x480.jpg 768w, https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/navea_damm-1152x720.jpg 1152w\" \/><\/div>\n      <span class=\"ia-compare__tag ia-compare__tag--before\">Vandringshinder<\/span>\n      <span class=\"ia-compare__tag ia-compare__tag--after\">Faunapassage<\/span>\n      <span class=\"ia-compare__handle\" aria-hidden=\"true\"><span>\u2039 \u203a<\/span><\/span>\n      <input class=\"ia-compare__range\" type=\"range\" min=\"0\" max=\"100\" value=\"50\" aria-label=\"Compare before and after\">\n    <\/div>\n    [\/vc_column][vc_column width=&#8221;1\/12&#8243;][\/vc_column][vc_column width=&#8221;5\/12&#8243; css=&#8221;.vc_custom_1737973500751{background-color: #15526e !important;}&#8221;]<p class=\"ia-eyebrow ia-eyebrow--light\">Freshwater pearl mussel survival depends on host fish<\/p>    <header class=\"ia-head ia-head--left is-light\">\n      <h2 class=\"ia-head__title\">Barriers to migration<\/h2>      <div class=\"ia-head__lead\"><p>Removing migration barriers and opening up the river pearl mussel&#8217;s host fish, salmon and trout, will increase the species&#8217; ability to reproduce. Barriers to migration come in many forms, from natural to man-made dams and power plants. In some cases, a good solution may be to build a wildlife passage to allow fish and other organisms to bypass the migration barrier.<\/p>\n<\/div>    <\/header>\n    [\/vc_column][\/vc_row][\/vc_section][vc_section el_name=&#8221;Projektnyheter&#8221;][vc_row][vc_column]<p class=\"ia-eyebrow\">River Alster\u00e5n<\/p>    <header class=\"ia-head ia-head--left\">\n      <h2 class=\"ia-head__title\">Latest news from the project area<\/h2>      <div class=\"ia-head__lead\"><p>Here you can read news about the target species and the actions being taken in the project area.<\/p>\n<\/div>    <\/header>\n    [\/vc_column][vc_column]<p class=\"ia-btnrow\"><a class=\"ia-btn\" href=\"https:\/\/improveaquaticlife.se\/en\/whats-new\/\">Read more news <span class=\"ia-arrow\" aria-hidden=\"true\">\u2192<\/span><\/a><\/p>[\/vc_column][\/vc_row][\/vc_section]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_section background_position=&#8221;center center&#8221; css=&#8221;.vc_custom_1739286196120{background-image: url(https:\/\/improveaquaticlife.se\/wp-content\/uploads\/2025\/01\/backdrop_projekt.jpg?id=1219) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}&#8221; el_name=&#8221;Sidhuvud&#8221;][vc_row][vc_column][\/vc_column][\/vc_row][\/vc_section][vc_section css=&#8221;.vc_custom_1739286221218{background-color: linear-gradient(to top, transparent 0%, #faf6eb 100%) !important;}&#8221; el_name=&#8221;Projekt sammanfattning&#8221;][vc_row][vc_column width=&#8221;1\/2&#8243;][\/vc_column][vc_column width=&#8221;1\/12&#8243;][\/vc_column][vc_column width=&#8221;5\/12&#8243;][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/4&#8243;][\/vc_column][vc_column width=&#8221;1\/4&#8243;][\/vc_column][vc_column width=&#8221;1\/4&#8243;][\/vc_column][vc_column width=&#8221;1\/4&#8243;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]River Alster\u00e5n is a 125 km long river in south-eastern Sweden with a catchment area of 1 525 km\u00b2. It is one of Kalmar County&#8217;s most [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1808","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v28.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>River Alster\u00e5n | Aquatic habitat restoration<\/title>\n<meta name=\"description\" content=\"Explore the River Alster\u00e5n and its varied habitats, from forests and wetlands to the Baltic coast, within the Improve Aquatic LIFE restoration project.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/improveaquaticlife.se\/en\/alster-river\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta 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