5\u670827\u65e5\uff08\u6c34\uff0915\u6642\u304b\u3089\u74b0\u5883\u79d1\u5b66\u9662C204-1\u5ba4\u3067EES\u30bb\u30df\u30ca\u30fc\u3092\u884c\u3044\u307e\u3059\u3002
\n\u4eca\u56de\u306f\u30ce\u30fc\u30b6\u30f3\u30df\u30b7\u30ac\u30f3\u5927\u5b66\u3067\u6de1\u6c34\u751f\u614b\u7cfb\u306e\u7814\u7a76\u3092\u3057\u3066\u3044\u308bJill Leonard\u3055\u3093\u306b\u3001\u5317\u7c73\u4e94\u5927\u6e56\u306e\u79fb\u5165\u7a2e\u554f\u984c\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u9802\u304d\u307e\u3059\u3002
\n\u5916\u6765\u4e8c\u679a\u8c9d\u3084\u30cf\u30bc\u79d1\u9b5a\u985e\u306e\u79fb\u5165\u306b\u3088\u308a\u5728\u6765\u7a2e\u306e\u98df\u6027\u304c\u6025\u901f\u306b\u5909\u5316\u3057\u305f\u308a\u3001\u6c34\u9ce5\u306e\u30dc\u30c4\u30ea\u30cc\u30b9\u4e2d\u6bd2\u75c7\u306b\u5916\u6765\u7a2e\u304c\u95a2\u4e0e\u3057\u3066\u3044\u305d\u3046\u306a\u3053\u3068\u306a\u3069\u3001\u8208\u5473\u6df1\u3044\u7814\u7a76\u7d50\u679c\u3092\u5831\u544a\u3057\u3066\u9802\u304f\u4e88\u5b9a\u3067\u3059\u3002
\n\u5e45\u5e83\u3044\u74b0\u5883\u554f\u984c\u3092\u6271\u3063\u3066\u3044\u308b\u305f\u3081\u591a\u304f\u306e\u65b9\u306b\u8208\u5473\u3092\u6301\u3063\u3066\u9802\u3051\u308b\u3068\u601d\u3044\u307e\u3059\u3002
\n\u7686\u3055\u307e\u306e\u3054\u53c2\u52a0\u304a\u5f85\u3061\u3057\u3066\u304a\u308a\u307e\u3059\u3002<\/p>\n
\u5c0f\u6cc9\u9038\u90ce<\/p>\n
\u7814\u7a76\u9662\u30a2\u30ef\u30fc\u306e\u304a\u77e5\u3089\u305b\uff08EES seminar\uff09
\nTime: 2015\u5e745\u670827\u65e5\uff08\u6c34\uff0915:00-16:30bio-senko@ees.hokudai.ac.jp
\nPlace: C204-1
\nSpeaker: Dr. Jill B.K. Leonard
\nChair: \u5c0f\u6cc9\u9038\u90ce<\/p>\n
Title: Great Lakes Invaders: Changes to the Lake Michigan Food Web and Their Links to Botulism Toxicity<\/p>\n
Abstract:<\/p>\n
The Laurentian Great Lakes in North America are the largest group of freshwater lakes in the world and contain ~21% of the surface freshwater on the planet. The lakes vary in ecological conditions from the relatively pristine and oligotrophic Lake Superior to the more eutrophic and anthropogenically impacted Lake Erie. All the lakes have been subjected to substantial human modification including water diversion, pollution, and non-native species introductions. While some non-native species introductions have been intentional (e.g. Pacific salmonids), many more have been unintentional and some of these species have caused dramatic ecological changes in the lakes. In two studies, we have been working to understand alterations caused by the introduction of dreissenid mussels (Dreissena spp.) and round goby (Neogobius melanostomus) in Lake Michigan. <\/p>\n
First, we evaluated the change in diet of the piscivorous burbot (Lota lota) over a 16 year (1996-2012) sample series from eastern Lake Michigan. Burbot dramatically shifted their diet from alewife (Alosa pseudoharengus) and freshwater sculpin (Cottus spp.) to round goby. Goby first appeared in the diet in 1999 and became frequent in 2006 reaching ~56% of all items consumed by 2012. This change is important because it demonstrates the ability of this native predator to take advantage of a new, invasive, prey source. Our data also suggest that native predatory species may be able to impact invasive species population dynamics and bring nutrients sequestered to the lake bottom back up into the water column through round goby consumption.<\/p>\n
In the second study, we also worked to understand the prey consumption dynamics of top-level predators; however, we focused on waterbirds such as the common loon (Gavia immer), piscivorous and molluscivorous ducks, and double crested cormorants (Phalacrocorax auritus) which have been the victims of botulism type E mortality in Lake Michigan. We were able to evaluate stomach contents of recently dead waterbirds collected from several areas in northern Lake Michigan and confirmed that most species had been feeding on round goby immediately before death. Several other species had fed substantially on dreissenid mussels. This data confirms that native species, including migratory waterbirds, are shifting their diet to the abundant invasive species in Lake Michigan and suggests two additional potential pathways for botulism to affect birds: directly through mussel consumption and less directly through the consumption of intoxicated round goby.<\/p>\n","protected":false},"excerpt":{"rendered":"
5\u670827\u65e5\uff08\u6c34\uff0915\u6642\u304b\u3089\u74b0\u5883\u79d1\u5b66\u9662C204-1\u5ba4\u3067EES\u30bb\u30df\u30ca\u30fc\u3092\u884c\u3044\u307e\u3059\u3002 \u4eca\u56de\u306f\u30ce\u30fc\u30b6\u30f3\u30df\u30b7\u30ac\u30f3\u5927\u5b66\u3067\u6de1\u6c34\u751f\u614b\u7cfb\u306e\u7814\u7a76\u3092\u3057\u3066\u3044\u308bJill Leonard\u3055\u3093\u306b\u3001\u5317\u7c73\u4e94\u5927\u6e56\u306e\u79fb\u5165\u7a2e\u554f\u984c\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u9802\u304d\u307e\u3059\u3002 \u5916\u6765\u4e8c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_locale":"ja","_original_post":"https:\/\/www.ees.hokudai.ac.jp\/ees\/?p=739","vk-ltc-link":"","vk-ltc-target":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-739","post","type-post","status-publish","format-standard","hentry","category-old-news","ja"],"acf":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"publishpress_future_action":{"enabled":false,"date":"2026-04-29 18:13:33","action":"change-status","newStatus":"private","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=\/wp\/v2\/posts\/739","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=739"}],"version-history":[{"count":0,"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=\/wp\/v2\/posts\/739\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=739"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ees.hokudai.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}