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First published online March 16, 2007
Journal of Experimental Biology 210, 1109-1115 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.002238
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Gill morphology of the mangrove killifish (Kryptolebias marmoratus) is plastic and changes in response to terrestrial air exposure

K. J. Ong, E. D. Stevens and P. A. Wright*

Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada


Figure 1
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  		Fig. 1. Schematic diagram of one filament from K. marmoratus indicating the filament, secondary lamellae, interlamellar cell mass (ILCM) and gill arch. Measures (µm) of total lamellar length (l), ILCM height (h) and lamellar width (w) are indicated.

 

Figure 2
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  		Fig. 2. Metabolic rate (µmol CO2 g–1 h–1) of K. marmoratus exposed to air: (A) over a 5-day period and (B) over 24 h. In B, hourly rates were averaged from different days. Values represent means ± s.e.m. (days 1, 2, 3 N=14; days 4, 5 N=7). Values with different letters are significantly different (P<0.05).

 

Figure 3
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  		Fig. 3. Scanning electron micrographs of gill filaments from K. marmoratus in (A) control conditions in 16{per thousand} seawater and (B) after 1 week of air exposure. Scale bars, 40 µm.

 

Figure 4
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  		Fig. 4. Light micrographs of gill filaments of K. marmoratus from (A) control conditions in water, (B) 1 h of air exposure, (C) 1 day of air exposure, (D,E) 1 week of air exposure and (F) 1 week of air exposure followed by 1 week of recovery in water. Experimental treatments for the two fish shown in D and E are identical, but in D the interlamellar cell mass (ILCM) partially fills the channel between secondary lamellae, and in E the ILCM completely fills this same space. Scale bar, 40 µm.

 

Figure 5
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  		Fig. 5. Effect of water and air exposure treatments on: (A) lamellar width, (B) total lamellar length and (C) interlamellar cell mass (ILCM) height. Values are mean ± s.e.m. (N=6). Dark bars indicate immersion, light bars indicate emersion. Significantly different (P<0.05) values are indicated with an asterisk (*).

 




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