{"id":15907,"date":"2025-01-24T11:25:41","date_gmt":"2025-01-24T17:25:41","guid":{"rendered":"https:\/\/uwm.edu\/field-station\/?p=15907"},"modified":"2025-01-24T11:27:34","modified_gmt":"2025-01-24T17:27:34","slug":"stream-bluets-and-rivers","status":"publish","type":"post","link":"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/stream-bluets-and-rivers\/","title":{"rendered":"Stream Bluets and Rivers"},"content":{"rendered":"\n<p>Greetings, BugFans,<\/p>\n\n\n\n<p>The BugLady likes to \u201cbug\u201d (if birders \u201cbird,\u201d can \u201cbug\u201d be a verb for folks who are looking for insects?) along the Milwaukee River at Waubedonia Park because (surprise) it\u2019s great for dragonflies and damselflies \u2013 she\u2019s photographed 25 species there.&nbsp;Most productive are the small bays along the shoreline where water lilies and arrowhead grow and the current is negligible, but she\u2019s also written about the crowds of ovipositing Powdered Dancers that favor <a href=\"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/powdered-dancer\/\">submerged aquatic vegetation in the currents near shore<\/a>. &nbsp;<\/p>\n\n\n\n<figure class=\"alignleft uwm-c-img--left\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"214\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream-male20-11rz-copy-300x214.webp\" alt=\"bluet on stem\" class=\"wp-image-15902\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream-male20-11rz-copy-300x214.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream-male20-11rz-copy-768x548.webp 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream-male20-11rz-copy.webp 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p>About the time that the Powdered Dancers are peaking, the beautiful Stream Bluets are, too, and the vegetation along the riverbank flickers with tandem pairs.&nbsp;Males are \u201cblack-type\u201d bluets \u2013 of the 35 similarly-marked and frequently-confusing species of bluet damselflies (17 species in Wisconsin), most are, as their name suggests, blue on some portion of their bodies. For \u201cease of identification,\u201d they\u2019re sorted into black-type, mid-type, and blue-type bluets based on the amount of blue in the male\u2019s abdomen.&nbsp;However much blue is or isn\u2019t there, the abdomens of most male bluets (except for the few that are red or orange) are tipped with blue, and the Stream Bluet has a deep \u201cV\u201d cut in the top side of that blue.&nbsp;<\/p>\n\n\n\n<figure class=\"alignleft uwm-c-img--left\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"215\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream-fe19-6-copy-300x215.webp\" alt=\"bluet on leaf\" class=\"wp-image-15901\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream-fe19-6-copy-300x215.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream-fe19-6-copy-768x549.webp 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream-fe19-6-copy.webp 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p>Female Stream Bluets, sometimes described as drab, have lovely lime-green bodies (unless they are blue-morph females) and a line along the thorax that the books call brown but that always looks gold to the BugLady.&nbsp;Unlike most species of bluets, female Stream Bluets also have some blue at the end of the abdomen.&nbsp;<\/p>\n\n\n\n<figure class=\"alignright uwm-c-img--right\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream23-5rz-copy-300x300.webp\" alt=\"bluets mating\" class=\"wp-image-15904\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream23-5rz-copy-300x300.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream23-5rz-copy-150x150.webp 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream23-5rz-copy-768x768.webp 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream23-5rz-copy-400x400.webp 400w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream23-5rz-copy-600x600.webp 600w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream23-5rz-copy.webp 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p>Stream Bluets (<em>Enallagma exsulans<\/em>) are in the family Coenagrionidae (the Narrow-winged damselflies) and in the genus&nbsp;<em>Enallagma<\/em>, the American bluets. With a few exceptions, family members tend to prefer the edges of lakes or ponds ringed with vegetation, and except for picking moving water over still, Stream Bluets lead a fairly typical bluet lifestyle.&nbsp;Stream Bluets chase their prey \u2013 tiny insects &#8211; through the vegetation, making short forays in sheltered areas, but some fly out and hover over water. &nbsp;<\/p>\n\n\n\n<p class=\"uwm-c-link--external\">Females may oviposit alone or with the male still clasping the back of her head (contact-guarding &#8211; to keep her from being swiped by a rambunctious rival male).&nbsp;She extends her abdomen to <a href=\"https:\/\/bugguide.net\/node\/view\/1149080\/bgimage\">place her eggs in submerged plant stems<\/a>, but if she goes under completely (she may stay down for a half-hour), the male will let go. The eggs hatch soon after, the naiads feed, and the almost-mature naiads overwinter.&nbsp;<\/p>\n\n\n\n<figure class=\"alignleft uwm-c-img--left\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"214\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream20-21rz-copy-300x214.webp\" alt=\"bluets mating\" class=\"wp-image-15903\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream20-21rz-copy-300x214.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream20-21rz-copy-768x548.webp 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/bluet-stream20-21rz-copy.webp 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p><strong>And Rivers \u2026\u2026. a rumination<\/strong><\/p>\n\n\n\n<p>If you could cut a cross section of a river, you\u2019d find a seemingly infinite number of habitats and microhabitats in it, each formed by a specific combination of factors: water depth, the topography of the river (there\u2019s a difference between the current in the \u201cinside curve,\u201d the \u201coutside curve,\u201d and middle of a river), erosion, the makeup of the bottom\/substrate (smooth, rocky, pebbly, leafy, littered with tree trunks, etc.), types and locations of aquatic vegetation, the strength of its current, water quality (amount of dissolved oxygen and other gasses, sediment, pH (acidity), chemicals, and pollutants), light, temperature, available nutrients, and influences of the land at its edges and upstream.&nbsp;None of these factors is static \u2013 most can change quickly and drastically, and sometimes permanently.&nbsp;And, because of the dynamics of water, if you cut another cross section 100 feet up or downstream, it would probably look different. Each of those habitats and microhabitats is attractive (or unattractive) to a particular set of organisms.&nbsp;<\/p>\n\n\n\n<p>The same is true of a prairie or woodland.<\/p>\n\n\n\n<p>Insects that live in rivers, either as immatures or as \u201clifers,\u201d have the same needs as those that live in quiet waters \u2013 oxygen, food, some elbow room, the ability to get around, the need to hide from predators, a way to keep excess water out.&nbsp;A wide array of adaptations \u2013 of different ways to accomplish the same goal &#8211; allows a wide array of invertebrates to live successfully in the same habitat without using each other\u2019s resources.&nbsp;River dwellers have an additional requirement &#8211; in water that is always moving, they need a way to stay put.&nbsp;<\/p>\n\n\n\n<figure class=\"alignright uwm-c-img--right\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"214\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/waubedonia-flood16-5rz-copy-300x214.webp\" alt=\"lake with trees\" class=\"wp-image-15905\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/waubedonia-flood16-5rz-copy-300x214.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/waubedonia-flood16-5rz-copy-768x548.webp 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/waubedonia-flood16-5rz-copy.webp 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p>Waubedonia dragons and damsels oviposit in their favorite slice of habitat and their naiads spend about a year ambushing their prey as they sprawl on underwater rocks, plant leaves, and stems or while they hide in muck and debris on the river bottom.&nbsp;<\/p>\n\n\n\n<p>\u201c<em>If the creek don\u2019t rise<\/em>,\u201d they will complete their life cycle in the same area, but the creek does rise, sometimes dramatically.<\/p>\n\n\n\n<p>How do you even study something like this? It\u2019s hard to investigate the effects of flooding when floods are, often, sporadic and unpredictable. When the BugLady started researching this, she expected that she might find a few notes from disgruntled grad students saying \u201c<em>I was studying the macroinvertebrates of X River and we had a big flood and my plots were swept away and the bugs are all gone.<\/em>\u201d&nbsp;But there wasn\u2019t much out there (thanks, BugFan Bill, for helping to find and access some research).&nbsp;There were a few studies\/observations of flooding with respect to mosquito populations, and to Odonates as potential biocontrols of mosquitoes and as indicators of aquatic ecosystem health.<\/p>\n\n\n\n<p>Whether from a summer storm or spring ice melt, floods mix things up.&nbsp;After the initial blast of a flood, there can be long-term fallout.&nbsp;Among many other effects, floods revise\/scour the contours and textures of the river bottom, carrying away nutrients and shelters (but then delivering more), reshaping channels and changing currents, removing &nbsp;predators (and delivering more), and putting a load of silt into the water that cuts down light for photosynthesizing plants, and settles on underwater surfaces \u2013 including invertebrates.&nbsp;<\/p>\n\n\n\n<figure><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"514\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/waubedonia-flood19-2rz-copy.webp\" alt=\"lake with trees\" class=\"wp-image-15906\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/waubedonia-flood19-2rz-copy.webp 800w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/waubedonia-flood19-2rz-copy-300x193.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/01\/waubedonia-flood19-2rz-copy-768x493.webp 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>The BugLady is stunned by the enormity of the changes that a flooding event may trigger for critters that are a half-inch long and less.\u00a0Their ability to stay in place depends on whether they can get out of the current fast enough, so species that lead a sheltered life on the downstream side of a rock or tree trunk are at an advantage, but more mobile individuals must literally swim for their lives, and those that are weak swimmers don\u2019t stand a chance of staying put.\u00a0<\/p>\n\n\n\n<p>One study showed that in a single spring thaw event in New Zealand, 50% of the macroinvertebrates were washed away! Another postulated that populations bounce back pretty fast after flooding as larvae that took shelter move back to their micro-habitats, and that the ability to take steps to avoid being washed away may impact a species\u2019 fitness and persistence.<\/p>\n\n\n\n<p>When the Urban Ecology Center in Milwaukee County records a new dragonfly species along the river, is it a gift from upstream?<\/p>\n\n\n\n<p>The BugLady is still wrapping her head around this.&nbsp; So many moving parts.<\/p>\n\n\n\n<p><em>The BugLady<\/em><\/p>\n\n\n<div class=\"taxonomy-post_tag wp-block-post-terms\"><a href=\"https:\/\/uwm.edu\/field-station\/tag\/bluets\/\" rel=\"tag\">bluets<\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>Greetings, BugFans, The BugLady likes to \u201cbug\u201d (if birders \u201cbird,\u201d can \u201cbug\u201d be a verb for folks who are looking for insects?) along the Milwaukee River at Waubedonia Park because (surprise) it\u2019s great for dragonflies and damselflies \u2013 she\u2019s photographed &hellip;<\/p>\n","protected":false},"author":19040,"featured_media":15900,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[8],"tags":[640],"class_list":["post-15907","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bug-of-the-week","tag-bluets"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Field Station<\/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:\/\/uwm.edu\/field-station\/bug-of-the-week\/stream-bluets-and-rivers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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