Fig. 26.7 Live Epithemia turgida showing endosymbiotic cyanobacteria. Epithemia turgida is a
freshwater diatom species that often contains endosymbiotic cyanobacteria, as do many of the
Epithemia. Those endosymbionts supply fixed nitrogen and carbohydrates. This portable supply of
nitrogen enables the Epithemia to live in waters of low N/P ratio. In this image, the endosymbionts
are visible as round bodies within the Epithemia cytoplasm. Epithemia turgida do in turn often live
as epiphytes on algae and fungi. This image is being used with the kind permission of its author Rex
L. Lowe
Fig. 26.8 Eating the neighbors. This photograph shows an amoeba that has ingulfed diatoms as an
example of parasitism. This image is titled “Collection Penard MHNG Specimen 05bis-1-1
Amoeba proteus.tif” by author Dalinda Bouraoui and is being used under a Creative Commons
Attribution-Share Alike 3.0 Unported license
26 The Game of Evolution Is Won by Competitive Cheating
555
freshwater diatom species that often contains endosymbiotic cyanobacteria, as do many of the
Epithemia. Those endosymbionts supply fixed nitrogen and carbohydrates. This portable supply of
nitrogen enables the Epithemia to live in waters of low N/P ratio. In this image, the endosymbionts
are visible as round bodies within the Epithemia cytoplasm. Epithemia turgida do in turn often live
as epiphytes on algae and fungi. This image is being used with the kind permission of its author Rex
L. Lowe
Fig. 26.8 Eating the neighbors. This photograph shows an amoeba that has ingulfed diatoms as an
example of parasitism. This image is titled “Collection Penard MHNG Specimen 05bis-1-1
Amoeba proteus.tif” by author Dalinda Bouraoui and is being used under a Creative Commons
Attribution-Share Alike 3.0 Unported license
26 The Game of Evolution Is Won by Competitive Cheating
555