44
Fig. 4.1 Marine N 2 fixation habitats, from surface open ocean to diverse benthic systems.
(Republished from Zehr and Capone (2020) with permission
Fig. 4.2 Water column diazotrophic microorganisms. (a). Trichodesmium. (b). Crocosphaera,
scale bar 5 μm. (c). Diatom symbionts: Hemiaulus-Richelia and Rhizosolenia-Richelia. (d).
Calothrix, frequent epibiont on Chaetoceros diatoms, scale bar 10 μm. (e). UCYN-A.FISH images
of UCYN-A1 (oceanic) and UCYN-A2 (coastal), scale bar 1 μm. Light micrograph of flagellated
and calcified forms, UCYN-A2. (f). Nodularia spumigena. (g). Dolichospermum-Aphanizomenon.
(h). Heterotrophic bacteria (isolated from Baltic Sea). (Micrographs courtesy of A. White (a),
C. Schvarcz (b–d), K. Hagino (E-light micrographs and EM), Helena Höglander (f–G), L. Riemann
(h). FISH images (e) reprinted from Cornejo-Castillo et al. (2019), with permission)
4 Microorganisms and Habitats
Fig. 4.1 Marine N 2 fixation habitats, from surface open ocean to diverse benthic systems.
(Republished from Zehr and Capone (2020) with permission
Fig. 4.2 Water column diazotrophic microorganisms. (a). Trichodesmium. (b). Crocosphaera,
scale bar 5 μm. (c). Diatom symbionts: Hemiaulus-Richelia and Rhizosolenia-Richelia. (d).
Calothrix, frequent epibiont on Chaetoceros diatoms, scale bar 10 μm. (e). UCYN-A.FISH images
of UCYN-A1 (oceanic) and UCYN-A2 (coastal), scale bar 1 μm. Light micrograph of flagellated
and calcified forms, UCYN-A2. (f). Nodularia spumigena. (g). Dolichospermum-Aphanizomenon.
(h). Heterotrophic bacteria (isolated from Baltic Sea). (Micrographs courtesy of A. White (a),
C. Schvarcz (b–d), K. Hagino (E-light micrographs and EM), Helena Höglander (f–G), L. Riemann
(h). FISH images (e) reprinted from Cornejo-Castillo et al. (2019), with permission)
4 Microorganisms and Habitats