{"id":869,"date":"2021-05-21T13:17:56","date_gmt":"2021-05-21T17:17:56","guid":{"rendered":"http:\/\/www.montclair.edu\/water-science\/?page_id=869"},"modified":"2023-11-22T15:11:58","modified_gmt":"2023-11-22T20:11:58","slug":"dolichospermum","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\/dolichospermum\/","title":{"rendered":"Dolichospermum"},"content":{"rendered":"

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

Examples of Dolichospermum<\/em><\/h2>\n

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

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

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

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

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

400X total magnification.<\/p><\/div>

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

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

Morphology<\/h2>\n

Trichomes usually solitary, or in small, irregular clusters; straight, curved, or coiled; isopolar; not narrowed towards the ends; usually with clear constrictions at crosswalls; metameric. Never with firm sheaths; sometimes with fine mucilaginous envelopes. Cells spherical, barrel-shaped, or nearly cylindrical; usually isodiametric, sometimes longer than wide (up to 2x longer than wide). Terminal cells not different from other vegetative cells; rounded at the ends. Obligately with aerotopes.<\/strong><\/p>\n

Heterocytes intercalary (but can be found in a terminal position only after disintegration of a trichome); solitary; usually spherical, sometimes barrel-shaped; as wide as vegetative cells (or nearly so; slightly wider or narrower). Akinetes intercalary; solitary, or sometimes in rows of up to 5; cylindrical, ovoid, oval, or spherical in shape; developing paraheterocytically, adjacent to or slightly distant from heterocytes.<\/p>\n

Ecology<\/h2>\n

Trichomes are planktic, or rarely metaphytic. Mostly reported in temperate zones, in freshwater mesotrophic lakes and ponds. Capable of forming surface blooms.<\/p>\n

Note that Dolichospermum<\/em> was formerly classified as a cluster of “planktic Anabaena<\/em>” species<\/strong>; the two genera are distinct phylogenetically, morphologically, and ecologically. Unlike Anabaena<\/em>, Dolichospermum<\/em> is planktic, cells obligately contain aerotopes, and trichomes are mostly solitary (not forming mats).<\/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. 183-214). 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. 697-698). Heidelberg, Germany: Springer Spektrum.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

    Taxonomy Order Nostocales Family Aphanizomenonaceae Genus Dolichospermum Examples of Dolichospermum Morphology Trichomes usually solitary, or in small, irregular clusters; straight, curved, or coiled; isopolar; not narrowed towards the ends; usually with clear constrictions at crosswalls; metameric. Never with firm sheaths; sometimes with fine mucilaginous envelopes. Cells spherical, barrel-shaped, or nearly cylindrical; usually isodiametric, sometimes longer […]<\/p>\n","protected":false},"author":34,"featured_media":611,"parent":827,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inline_featured_image":false,"footnotes":""},"class_list":["post-869","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/pages\/869","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=869"}],"version-history":[{"count":6,"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/pages\/869\/revisions"}],"predecessor-version":[{"id":1224,"href":"https:\/\/www.montclair.edu\/water-science\/wp-json\/wp\/v2\/pages\/869\/revisions\/1224"}],"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=869"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}