U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications
Table 2. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area O-34.0 in the lower Columbia River, July and October 1994 and January and April 1995. Five stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
39		 0.49
17.14
 0.689
0.000*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
39		 0.82
19.59
 0.492
0.000*
Diversity (H)

 Month
Transect
Total		 3
1
39		 1.94
0.00
 0.143
0.953
Equitability (E)

 Month
Transect
Total		 3
1
39		 2.08
9.51
 0.122
0.004*
Table 7. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area W-40.9 in the lower Columbia River, July and October 1994 and January and April 1995. Three stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
23		 0.40
17.51
 0.752
0.001*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
23		 0.39
13.71
 0.763
0.002*
Diversity (H)

 Month
Transect
Total		 3
1
23		 0.48
1.43
 0.700
0.250
Equitability (E)

 Month
Transect
Total		 3
1
39		 0.57
3.28
 0.646
0.089
Table 12. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area W-43.8 in the lower Columbia River, July and October 1994 and January and April 1995. Four stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
31		 0.38
7.42
 0.771
0.012*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
31		 1.01
7.30
 0.404
0.012*
Diversity (H)

 Month
Transect
Total		 3
1
31		 5.58
0.30
 0.005*
0.591
Equitability (E)

 Month
Transect
Total		 3
1
31		 4.51
1.66
 0.012*
0.210
Table 17. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area O-44.0 in the lower Columbia River, July and October 1994 and January and April 1995. Nine stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
71		 0.61
20.49
 0.613
0.000*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
71		 0.58
30.48
 0.628
0.000*
Diversity (H)

 Month
Transect
Total		 3
1
71		 0.57
12.80
 0.639
0.001*
Equitability (E)

 Month
Transect
Total		 3
1
71		 1.06
0.66
 0.373
0.419
Table 22. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area W-45.0 in the lower Columbia River, July and October 1994 and January and April 1995. Five stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
39		 0.61
21.20
 0.612
0.000*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
39		 0.30
8.75
 0.829
0.006*
Diversity (H)

 Month
Transect
Total		 3
1
39		 3.30
1.24
 0.033*
0.274
Equitability (E)

 Month
Transect
Total		 3
1
39		 1.78
0.15
 0.170
0.705
Table 27. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area O-45.1 in the lower Columbia River, July and October 1994 and January and April 1995. Two stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
15		 0.09
2.13
 0.966
0.183
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
15		 0.28
1.26
 0.837
0.295
Diversity (H)

 Month
Transect
Total		 3
1
15		 0.90
1.32
 0.483
0.284
Equitability (E)

 Month
Transect
Total		 3
1
15		 0.31
1.40
 0.817
0.271
Table 32. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area O-47.8 in the lower Columbia River, July and October 1994 and January and April 1995. Three stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
23		 5.84
22.99
 0.007*
0.000*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
23		 3.09
34.97
 0.057
0.000*
Diversity (H)

 Month
Transect
Total		 3
1
23		 1.07
22.08
 0.389
0.000*
Equitability (E)

 Month
Transect
Total		 3
1
23		 0.52
1.43
 0.672
0.249
Table 37. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area O-57.0 in the lower Columbia River, July and October 1994 and January and April 1995. Four stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
31		 0.20
15.03
 0.899
0.001*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
31		 0.07
7.39
 0.978
0.012*
Diversity (H)

 Month
Transect
Total		 3
1
31		 3.39
2.93
 0.034*
0.100
Equitability (E)

 Month
Transect
Total		 3
1
31		 2.14
10.20
 0.122
0.004*
Table 42. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area W-70.1 in the lower Columbia River, July and October 1994 and January and April 1995. Seven stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
55		 0.13
13.33
 0.940
0.001*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
55		 0.68
14.08
 0.568
0.000*
Diversity (H)

 Month
Transect
Total		 3
1
55		 0.85
6.78
 0.472
0.012*
Equitability (E)

 Month
Transect
Total		 3
1
39		 1.52
2.08
 0.222
0.156
Table 47. Results of two-way analysis of variance for selected benthic invertebrate parameters measured at Beach Nourishment Area O-75.8 in the lower Columbia River, July (all samples were collected on 1 August) and October 1994 and January and April 1995. About 274 m (900 ft) of the upper end of Beach Nourishment Area O-74.5 is included with Beach Nourishment Area O-75.8. Four stations were sampled along both the 15-m and 30-m transects in the beach nourishment area; these parallel transects were located about 15 and 30 m from the high tide mark on the beach. A significant difference (P < 0.05) is indicated with an asterisk (*).
Degrees of P
Parameter Source freedom F value
Benthic invertebrate
density (log10(value
+ 1)), total		 Month
Transect
Total		 3
1
31		 12.31
12.67
 0.000*
0.002*
Corophium spp. density
(log10(value + 1))
 Month
Transect
Total		 3
1
31		 10.26
5.40
 0.000*
0.029*
Diversity (H)

 Month
Transect
Total		 3
1
31		 4.55
5.00
 0.012*
0.035*
Equitability (E)

 Month
Transect
Total		 3
1
31		 0.84
0.61
 0.488
0.441