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1 1 2Oct-Dec 1986

Peru Margin

1 6 4Oct-Dec 1995

Blake Ridge

Gas Hydrates

1 5 5Mar-May 1994

Amazon Fan

1 4 6Sep-Nov 1992

Cascadia MarginSta. Barbara Basin

1 3 9Jul-Sep 1991

Juan de Fuca Ridge

1 6 8Jun-Aug 1996

Juan de Fuca Ridge

1 6 9Aug-Oct 1996

Juan de Fuca Ridge

1 3 5Oct-Dec 1995

Lau Basin

1 3 8Oct-Dec 1995

East Pacific

1 2 8

Aug-Oct 1989Japan Sea

1 6 1May-Jul 1995

Western

Mediterranean

1 6 0Mar-May 1995

Eastern

Mediterranean

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170

160

150

140

130

120

110

100

90

80

70

60

50

40

30

20

10

0

4 5 6 7 8 9

10

2030

4050

60

70

80

90

100

110

Temperature(C)

Dep

th(mbs

f)

MESOPHILE

THERMOPHILE

HYPER-THERMOPHILE

Total bacterial cells

(log10cells/cm3)

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300

280

260

240

220

200

180

160

140

120

100

80

60

40

20

0

3 4 5 6 7 8

Temperature(C)

Total bacterial cells

(log10cells/cm3)

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1000

100

10

1

.1

.01

.001

0 2 4 6 8 10 12

100

90

80

70

60

50

40

30

20

10

0

0 2 4 6 8 10 12100

10

1

.1

.01

.001

0 2 4 6 8 10 12

Porosity(%)

Age(mya)

Depth(mbsf)

c) POROSITY

r2= 0.194

Log10bacterial numbers

(cells/cm3)

b) AGE

r2= 0.328

a) DEPTH

r2= 0.559

Log10bacterial numbers

(cells/cm3)

Log10bacterial numbers

(cells/cm3)

Log aodc = 0.28 + 3.80 log porosity

r2= 0.194 n = 736 t = 13.29 (P

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7

8

9

10

109876543210 0

time 0 (34 d)

time 1 (197 d)

time 2 (478 d)

2-mm slices

Log Count

Nos/cm3

Increase in

Nos. = X 1.5

Increase in Nos.= X 2.26

irradiated plug

originals

ed.

originalsed.

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100

90

80

70

60

50

40

30

20

10

0

5 6 7 8 9 10

Depth(mbsf)

Total bacterial cells

(log10cells cm-3)

Increase in log total bacterial

population

0 1 2 3

Time to doublepopulation = 0.92 mya

Percentage of cells

dividing = 8.3%

Estimated cell division

time ~ 105 ky

0

1

2

3

4

5

Sedimentage(mya)

y = 0.463 + 0.329x

R = 0.994

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