Effect of hydrostatic pressure on the wavelength of maximum absorbance(λmax) of difference spectra of visual pigment extracts from 12 species of deep-sea fish, from a range of depths and habitats
| Species . | N . | Capture depth (m) . | Previously measured λmax (nm) . | Average intercept λmax (nm) . | Average gradient (nm MPa-1) . | Average λmax shift (0.1–40 MPa) (nm) . |
|---|---|---|---|---|---|---|
| Alepocephalus agassizii Goode and Bean 1883 | 1 | 1375 | 4771 | 483.09 | 0.02772 | 1.1 |
| Antimora rostrata (Günther 1878) | 2 | 1102 | 475, 4832 | 489.54 | 0.03261 | 1.3 |
| Bathysaurus ferox Günther 1878 | 1 | 1342 | 4811 | 484.64 | 0.02194 | 0.9 |
| Borostomias antarcticus (Lönnberg 1905) | 1 | 800 | 4853 | 490.72 | 0.02105 | 0.8 |
| Coryphaenoides (N.) armatus (Hector 1987) | 5 | 2750 | 4811 | 488.66 | 0.04120 | 1.6 |
| Coryphaenoides guentheri (Vaillant 1888) | 2 | 1401 | 4791 | 494.69 | 0.03907 | 1.6 |
| Electrona carlsbergi (Tåning 1932) | 1 | 295 | 4853 | 481.62 | 0.05908 | 2.4 |
| Gymnoscopelus fraseri (Fraser-Brunner 1931) | 2 | 45 | 4883 | 489.80 | 0.02946 | 1.2 |
| Lepidion eques (Günther 1887) | 1 | 700 | 476, 4842 | 500.32 | 0.03548 | 1.4 |
| Nannobrachium achirus (Andriashev 1962) | 1 | 940 | 4863 | 487.11 | 0.02906 | 1.2 |
| Nezumia aequalis (Günther 1878) | 3 | 782 | 4841 | 488.80 | 0.03744 | 1.5 |
| Protomyctophum choriodon Hulley 1981 | 3 | 150 | 4833 | 481.66 | 0.03205 | 1.3 |
| Species . | N . | Capture depth (m) . | Previously measured λmax (nm) . | Average intercept λmax (nm) . | Average gradient (nm MPa-1) . | Average λmax shift (0.1–40 MPa) (nm) . |
|---|---|---|---|---|---|---|
| Alepocephalus agassizii Goode and Bean 1883 | 1 | 1375 | 4771 | 483.09 | 0.02772 | 1.1 |
| Antimora rostrata (Günther 1878) | 2 | 1102 | 475, 4832 | 489.54 | 0.03261 | 1.3 |
| Bathysaurus ferox Günther 1878 | 1 | 1342 | 4811 | 484.64 | 0.02194 | 0.9 |
| Borostomias antarcticus (Lönnberg 1905) | 1 | 800 | 4853 | 490.72 | 0.02105 | 0.8 |
| Coryphaenoides (N.) armatus (Hector 1987) | 5 | 2750 | 4811 | 488.66 | 0.04120 | 1.6 |
| Coryphaenoides guentheri (Vaillant 1888) | 2 | 1401 | 4791 | 494.69 | 0.03907 | 1.6 |
| Electrona carlsbergi (Tåning 1932) | 1 | 295 | 4853 | 481.62 | 0.05908 | 2.4 |
| Gymnoscopelus fraseri (Fraser-Brunner 1931) | 2 | 45 | 4883 | 489.80 | 0.02946 | 1.2 |
| Lepidion eques (Günther 1887) | 1 | 700 | 476, 4842 | 500.32 | 0.03548 | 1.4 |
| Nannobrachium achirus (Andriashev 1962) | 1 | 940 | 4863 | 487.11 | 0.02906 | 1.2 |
| Nezumia aequalis (Günther 1878) | 3 | 782 | 4841 | 488.80 | 0.03744 | 1.5 |
| Protomyctophum choriodon Hulley 1981 | 3 | 150 | 4833 | 481.66 | 0.03205 | 1.3 |
N is the number of individuals of each species measured.
Capture depths were calculated as the medians of all data for minimum capture depth available for each species at http://www.fishbase.org.
A linear regression was fitted to the λmax values at five different pressures (0.1, 9.0, 20.0, 31.0 and 45.8 or 54.0 MPa) for each animal examined. To avoid pseudo-replication, average data are presented here for each species.
The intercept on the λmax axis of the regression can be taken as an estimate of the λmax at atmospheric pressure.
Average gradient is the gradient of the regression line.
Average λmax shift, the calculated shift inλ max from atmospheric pressure to 40 MPa (approximately equivalent to 4000 m depth).
References for previous and more accurate measurements ofλ max made using hydroxylamine are: 1Douglas et al. (1995); 2Douglas and Partridge,1997; 3R.H.D., E.M.W. and J.C.P., unpublished data.