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Thalassiosira sp

2963

3195

8435

6397

3131

Chaetoceros sp

14404

18883

4569

5320

1609

Skeletonema sp

925

2789

1406

0

0

Actinoptychus sp

10

21

703

154

217

Amphora sp

0

0

1230

0

0

Asterionella sp

0

0

0

923

1305

Biddulphia sp

5

16

0

0

0

Cymbella sp

0

0

246

0

0

Cocconeis sp

0

0

351

0

0

Coscinodiscus sp

69

53

0

0

0

Cylindrotheca sp

359

915

1757

0

0

Diploneis sp

0

0

0

0

0

Detonula schröderella

2367

2714

0

0

0

Eucampia sp

527

725

784465

1317366

418082

Grammatophora sp

79

107

17925

123

174

Licmophora sp

5

16

351

0

0

Leptocylindrus sp

0

0

6326

5874

43

Navicula sp

69

152

4218

1046

609

Paralia sp

0

0

6326

0

0

Pinnularia sp

0

0

1054

0

0

Pleurosigma sp

5

16

492

369

174

Pseudonitzschia sp

910

1937

3163

1968

2436

Rhizosolenia sp

5

16

1406

154

217

Thalassionema sp

49

156

0

0

0

Dinoflagellates Dinoflagellate n.i. Dinophysis sp Diplopsalis sp Gonyaulax sp Peridinium sympholis

344 5 276 20 15

429 16 436 34 33

492 0 492 984 0

1845 984 1722 369 0

174 696 696 174 0

Protoperidinium. aspidiotum

20

34

0

123

174

P. conicum P. grenlandicum P. aff. leonis P. parapyriforme P. steinii P. thorianum Scrippsiella trochoidea Ciliates Tintinnids

20 192 0 10 15 5 118 202 335

34 301 0 21 24 16 237 182 271

0 0 0 0 0 0 0 2214 2214

738 738 0 246 0 0 0 1845 2337

1044 348 0 0 0 0 0 174 174

Short-term changes in the concentration of chlorophyll.

17

Table I. Microplankton abundance (cells L-1) in Coliumo Bay before (n=10), during (n=1) and after (n=2) the storm. Std = standard deviation. n.i. = non identified.

Diatoms

Before

Std

During

After

Std

Consequently, for the ANOSIM observations were grouped into factor levels Before (on one side), and During and After storm (on the other side). ANOSIM confirmed differences in the taxonomic composition due to the storm (Global R= 0.99 on 286 possible permutations, p< 0.05) with intragoup

average similarities of 58 and 77% (before and after storm, respectively) and intergroup dissimilarity of 80% (SIMPER); taxa that contributed most heavily to dissimilarity between groups were Eucampia sp. (47.7%), Leptocylindrus sp. (3.6%) and Chaetoceros sp. (2.3%).

Pan-American Journal of Aquatic Sciences (2007), 2 (1): 13-22

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