{"id":865,"date":"2021-05-21T13:12:10","date_gmt":"2021-05-21T17:12:10","guid":{"rendered":"http:\/\/www.montclair.edu\/water-science\/?page_id=865"},"modified":"2023-11-28T12:49:59","modified_gmt":"2023-11-28T17:49:59","slug":"aphanizomenon","status":"publish","type":"page","link":"https:\/\/www.montclair.edu\/water-science\/freshwater-cyanobacteria-of-new-jersey\/visual-guide-to-cyanobacteria-in-new-jersey\/filamentous\/heterocyte-forming\/aphanizomenon\/","title":{"rendered":"Aphanizomenon"},"content":{"rendered":"

Taxonomy<\/h2>\n
\n
Order<\/dt>\n
Nostocales<\/dd>\n
Family<\/dt>\n
Aphanizomenonaceae<\/dd>\n
Genus<\/dt>\n
Aphanizomenon<\/em><\/dd>\n<\/dl>\n

Examples of Aphanizomenon<\/em><\/h2>\n
\n
\"aphanizomenon<\/a><\/figure>\n

400X total magnification; 10 \u03bcm scale bar.<\/p><\/div>

\n
\"aphanizomenon<\/a><\/figure>\n

400X total magnification; 10 \u03bcm scale bar.<\/p><\/div>

\n
\"aphanizomenon<\/a><\/figure>\n

400X total magnification; 20 \u03bcm scale bar.<\/p><\/div><\/p><\/div>\n

Morphology<\/h2>\n

Trichomes are often gathered into fasciculated colonies of roughly parallelly arranged trichomes (first two images to the right); these bundles may be macroscopic and look like flakes, or like “grass clippings” floating on the surface of waterbodies; trichomes are also sometimes solitary. Trichomes isopolar; straight to slightly curved; unconstricted to slightly constricted at crosswalls, rarely deeply constricted; may or may not be slightly narrowed towards the ends. Without firm sheaths; sometimes with fine, diffuse mucilaginous envelopes. Cells cylindrical or sometimes long barrel-shaped; with aerotopes; pale blue-green. End cells typically elongated and hyaline (clear); terminal cells flattened to rounded.<\/p>\n

Heterocytes intercalary and solitary; usually cylindrical, rarely oval, as wide as vegetative cells; rarely with more than 3 heterocytes per trichome (usually with just 1). Akinetes usually cylindrical (roughly oval in a couple species); intercalary; solitary or in rows of 2-3; developing paraheterocytically; close to or distant from heterocytes.<\/p>\n

Compare to Cuspidothrix<\/em>, which was separated from Aphanizomenon<\/em>; trichomes of Cuspidothrix<\/em> are distinctly narrowed and pointed at the ends.<\/p>\n

Ecology<\/h2>\n

Planktic; common bloom-former in temperate regions.<\/p>\n

References<\/h2>\n
    \n
  • Johansen, J. R., & Kom\u00e1rek, J. (2015). Filamentous Cyanobacteria. In J. D. Wehr, R. G. Sheath, & J. P. Kociolek (Eds.), Freshwater Algae of North America: Ecology and Classification<\/em> (2nd ed., pp. 183-212). Waltham, MA: Elsevier.<\/li>\n
  • Kom\u00e1rek, J. (2013). Cyanoprokaryota-3. Teil\/Part 3: Heterocytous Genera (J. R. Johansen, Ed.). In B. B\u00fcdel, G. G\u00e4rtner, L. Krienitz, & M. Schagerl (Eds.), S\u00fc\u00dfwasserflora von Mitteleuropa<\/em> (Vol. 19\/3, pp. 664-686). Heidelberg, Germany: Springer Spektrum.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

    Taxonomy Order Nostocales Family Aphanizomenonaceae Genus Aphanizomenon Examples of Aphanizomenon Morphology Trichomes are often gathered into fasciculated colonies of roughly parallelly arranged trichomes (first two images to the right); these bundles may be macroscopic and look like flakes, or like “grass clippings” floating on the surface of waterbodies; trichomes are also sometimes solitary. Trichomes isopolar; […]<\/p>\n","protected":false},"author":34,"featured_media":611,"parent":827,"menu_order":8,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inline_featured_image":false,"footnotes":""},"class_list":["post-865","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/pages\/865","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/users\/34"}],"replies":[{"embeddable":true,"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/comments?post=865"}],"version-history":[{"count":7,"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/pages\/865\/revisions"}],"predecessor-version":[{"id":1228,"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/pages\/865\/revisions\/1228"}],"up":[{"embeddable":true,"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/pages\/827"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/media\/611"}],"wp:attachment":[{"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/media?parent=865"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}