Far From Land The Mysterious Lives of Seabirds

20

°6

0°

60° 40° 20° 0° –20° –40° –60°

100°

140°

180°

220°

260° Chl a (mg/m

3 )

300°

00

.0

70

.2

0.

40

.6

1.

02

.0

5.

03

5.0

340°

PLATE 7

. The image shows marine productivity, as revealed by chlorophyll concentrations, in the world’s oceans. Generally, productivity,

measured by mg/m

3 is highest (redder tones) at higher latitudes and along continental margins. It is lower (bluer tones) nearer the Equator,

and conspicuously low (black) in mid-

ocean along the Tropics of Cancer and Capricorn (Source: NOAA).