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Fig. 3 | Helgoland Marine Research

Fig. 3

From: CO2-induced fertilization impairment in Strongylocentrotus droebachiensis collected in the Arctic

Fig. 3

a Sperms located in the PVS. Eggs and sperms showed auto-fluorescence in confocal images (left dark fields). b Details of indicated region in 3a. c Another section plane of the same egg in a. White and black arrows show the position of the FE; white and black insets indicate the sperms that can be conspicuously observed in the fluorescence image. d A sperm within the PVS (arrow heads) with a visible flagellum (light field)

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