HMSC
GC
856
C.0735
no.76-3
sup.
cop. 2
S z{
of
)CEANOGRAPHY
I
A Grab-Sample Study of the
Benthic Invertebrates of the
Columbia River Estuary
Supplemental Data Report
1 November 1975 through 29 February 1978
Submitted to:
Port of Astoria
Astoria, Oregon
NO03NO 31VIS fl N A1ISN3AI
by
Duane L. Higley and Robert L. Holton
Supplement to Reference 783
July 1978
A GRAB-SAMPLE STUDY OF THE
BENTHIC INVERTEBRATES OF THE COLUMBIA RIVER ESTUARY
Supplemental Data Report
1 November 1975 through 29 February 1976
Submitted to
Port of Astoria
Astoria, Qr grm
by
Duane L. Higley and Robert
L.
Holton
School of Oceanography
Oregon State University
Corvallis, Oregon
Supplement to
(Reference,.76-3
July 1978;
G. Ross Heath
Dean
ACKNOWLEDGEMENTS
The Port of Astoria,
Oregon,
supported this
project.
The United
States Energy Research and Development Administration originally
funded construction of the
vessel, R/V SACAJAWEA,
The College Work Study Program
(CWSP)
used in sample collection.
supported work by part-time
student employees.
Michael Richardson, Michael Kravitz, Howard
Colgate aided in specimen
identification.
Jones,
and William
Beverly Knapp provided
editorial assistance and Rebecca Hanson typed the manuscript.
NOTICE
The conclusions presented in this report are tentative, and are
subject to change based on a more complete study of the data.
ii
ABSTRACT
The report provides benthic invertebrate densities and sediment texture
data for 48 stations in the Columbia River estuary (Columbia River
mile 0-28) sampled by grab sampler between 31 August 1975 and 22 January
1976.
iii
PRINCIPAL INVESTIGATOR
Robert L. Holton
Assistant Professor
PARTICIPATING STAFF
A. Diane Ford
Duane L. Higley
Research Assistant
Research Assistant
GRADUATE STUDENTS
John S. Davis
Graduate Res. Asst.
PART-TIME EMPLOYEES
Therese Armetta
Kevin Glick
CWSP
Donald Gorman
CWSP
Daniel Stantus
CWSP
Gregg Takashima
CWSP
CWSP
R/V SACAJAWEA BOAT OPERATORS
Norman Kujala
Guy Yancy
iv
TABLE OF CONTENTS
LIST OF FIGURES .
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LIST OF TABLES
INTRODUCTION
METHODS
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RESULTS . .
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REFERENCES CITED
TABLES
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LIST OF FIGURES
FIGURE
1
Sample stations in the Columbia River estuary, 31 August
1975 to 22 January 1976
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LIST' or TABLES
TABLE
Checklist of benthic invertebrate taxa captured in
Columbia River estuary, 1975-1976.
2
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.
Sediment texture data for samples taken in Columbia
River estuary, 1975-1976. . . . . ..
.
3
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Benthos densities and station information for samples
taken in Columbia River estuary, 1975-1976. ..
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vi
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12
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15
INTRODUCTION
This report provides data developed from a short-term study made
of the benthic invertebrate fauna of the Columbia River estuary.
Sampling
was conducted between 31 August 1975 and 22 January 1976, and included an
area of approximately 130 square miles between Columbia River mile (CRM)
0 and CRM 28.
Samples were taken by grab sampler.
An earlier, taxonomically less complete version of the data was
presented in a final repur't (Mgley, Holton, and Komar, 1976)" submitted
That report,
to the Port of Astoria, Oregon, which supported the study.
while satisfying the contractural agreement stopped short of a complete
analysis of the samples.
The present supplement greatly improves the
taxonomic detail of the study, provides more complete counts on some
samples, and expands the sediment texture information provided for each
sample.
This additional work was performed with the view that these
samples provide the most complete survey available of the benthic infauna
of the Columbia River estuary and should be better utilized.
The data
should provide a useful basis for developing further studies and should
aid in making management decisions affecting the estuary.
1
The survey was conducted as a result of a proposal by the Port
of Astoria to fill a 32 hectare intertidal and subtidal region adjacent
to and west of their Pier 3 in Youngs
Holton,
1975)
Bay.
Earlier work (Higley and
had shown that benthic habitats in Youngs Bay are quite
productive of invertebrate organisms consumed by both transient and
resident fish
fill
site.
populations,
prompting concern for habitat loss at the
Benthic infauna and fish studies were therefore conducted
at the fill site, and a survey of benthic infauna and habitats was
made in the lower 28 miles of the Columbia River estuary to give pers-
pective to the data developed for the fill
site.
It is the estuary-wide,
survey which is reported in greater detail
here.
The benthic infauna
at the fill site and other areas of Youngs Bay are described in Higley
and Holton
(1975), Higley,
Holton and Komar
(1976), and Higley, Morgan
and Holton (in press).
Because of the sampling technique used
is basically an infauna
study.
(grab-sampler),
the survey
However, several epifaunal forms were.
captured and are included.
2
METHODS
The specifics of sample collection and analysis were presented in
Higley, Holton and Komar (1976).
Briefly, 51 stations were occupied, their
location chosen according to bathymetric charts and shoreline features
(Figure 1).
Two grabs per station (except one each at stations 108-110)
were taken with a 0.107
m2 Smith-McIntyre sampler,
screen, and fixed in 5 percent buffered formalin.
washed on a 0.425 mm
Later in the lab,
samples were split (usually with a Folsam plankton splitter) as required
by their size, and preserved in 4Q percent isopropanol.
Organisms in a
portion or all of 92 samples from 48 stations were picked, sorted, and
identified.
Samples with high sand content were first flushed with excess
water which washed light-bodied animals onto a sieve beneath.
These animals
were then sorted, and most of the residual sand fractions were examined for
molluscs and other heavy animals which did not wash out.
Invertebrate identification in the final report (Higley, Holton and
Komar, 1976) was restricted to order and higher taxomonic categories.
In
the present report, identification is to species where possible, although
some groups (Nematoda, Nemertea, Oligochaeta, and Ostracoda) remain as
reported before.
The use of "spp" varies among taxa.
which is extremely abundant as C.
In the amphipod genus Corophium,
salmonis in some muddy-sand areas,
Corophium spp. usually indicates animals not individually examined for
species identification.
For some Corophium and for other taxa, "spp" is
used for animals which could not be identified to species because they
were lost or damaged, were too young to identify, or did not fit available
3
124°00'
123°45'
123° 30'
BAKER BAY
GRAYS
BAY
V
HARRINGTON
PT
PT
ELLICE
ti
° CATBAY
{
YOUNGS
COLUMBIA
BAY
RIVER ESTUARY
NAUTICAL
MILES
NIL UMC t C N6
124°00'
12 3° 45'
Figure 1. Benthos and sediment sample stations in the Columbia River
estuary, 31 August 1975 to 22 January 1976.
123° 30'
The amphipod Anisogammarus apparently exists primarily as A.
keys.
confervicolus in the
estuary.
However, this species cannot be separated
from A. ramellus in the juvenile
stage,
which dominated the catch, and
therefore is usually called Anisogammarus spp.
Among bivalves,
juveniles
less than 3 mm long are reported separately because counts of larger
individuals may more accurately indicate successful substrate colonization.
A sediment subsample was removed from each grab sample and subjected
to a combination wet-dry sieving process on screens of 1.0, 0.5, 0.25,
0.125,
and 0.063 mm, corresponding to phi sizes of 0, 1, 2, 3, and 4,
respectively.
5
RESULTS
Animal taxa identifed in the survey are listed in Table 1.
Sediment texture data are presented in Table 2, which includes Inman
mean, median, and standard deviation values for most samples.
Inman values requiring extrapolation of size distribution data are
not included.
Table 3 provides the revised faunal
depth and
some details of sample
densities, as well as
station
analysis.
It is apparent from Table 3 that most marine invertebrate taxa
do not penetrate deep into the estuary.
The rich marine fauna
described by Richardson, Carey, and Colgate (1977) for stations
located offshore of the mouth of the Columbia River has greatly diminished
near the river
to brackish
(1975)
mouth and mostly gives
and freshwater forms as described
for Youngs Bay.
persist along
107, 108).
way upstream of Baker Bay
in Higley and Holton
However, some marine-oriented polychaetes
Bay (e.g.
the north channel up to Greys
This channel tends to carry
stations 28, 29,
more saline waters than does
the south channel (Neal, 1972).
As described
of this survey
areas.
in
Higley, Holton and Komar
(1976),
was the lack of intensive sampling
These extensive shallow
areas,
a deficiency
in the
shoaling
as well as vegetated-.islands,
may harbor large populations of invertebrates important to estuarine
fish production.
Certainly
future studies
the dominant invertebrate forms
should aim at identifying
in these habitats, and investigate
the relation of shoal movement to animal abundance.
6
REFERENCES CITED
Invertebrate Zoology.
1968.
Barnes, Robert D.
Co. Philadelphia, PA. 743 pp.
2nd Ed.
W.B. Saunders
Higley, Duane L., and Robert L. Holton. 1975. Biological Baseline
Data: Youngs Bay, Oregon, 1974; Final Report to Alumax Pacific
Aluminum Corporation, 1 November 1973 through 30 April 1975.
School of Oceanography Reference 75-6. Oregon State University,
91 pp.
Corvallis, Oregon.
Higley, Duane L., Robert L. Holton, and Paul D. Komar. 1976. Analysis
of Benthic Infauna Communities and Sedimentation Patterns of a
Proposed Fill Site and Nearby Regions in the Columbia River estuary.
Final Report to Port of Astoria, Astoria, Oregon, 1 November 1975
through 29 February 1976. School of Oceanography Reference 76-3.
Oregon State University, Corvallis, Oregon. 78 pp.
Higley, Duane L., John B. Morgan and Robert L. Holton. (in press).
Biological Baseline-and Fluoride Effects Data for Youngs Bay,
Oregon, 1974-1975. Supplemental Final Report to Alumax Pacific
Aluminum Corporation, 1 November 1973 through 30 May 1975.
Oregon State University,
School of Oceanography Reference 77-3.
Corvallis, Oregon.
Physical Aspects of the Columbia River and its
1972.
Neal, Victor T.
Estuary. Pp. 19-40 in A.T. Pruter and D.L. Alverson, eds., The
Columbia River Estuary and Adjacent Ocean Waters, University of
Washington Press, Seattle, Washington.
Richardson, Michael D., Andrew G. Carey, Jr., and William Colgate.
The Effects of Dredged Material Disposal on Benthic Assemblages
1977.
Off the Mouth of the Columbia River. Final Report to Army Corps
of Engineers. School of Oceanography, Oregon State University,
Corvallis, Oregon.
7
TABLES
8
TABLE 1
Checklist of benthic invertebrate taxa captured in the Columbia
River estuary, 31 August 1975 to 22 January 1976. Classification is
based on Barnes (1968). Table 3 of Higley and Holton (1976) presents
an earlier version of this checklist.
Phylum Cnidaria
Class Anthozoa
Phylum Nemertea
Phylum Nematoda
Phylum Platyhelminthes
Class Turbellaria
Phylum Annelida
Class Polychaeta
Family Ampharetidae
Amphicteis floridus
Family Capitellidae
Barantolla americana
Capitella capitata
Capitella capitata oculata
Mediomastus acutus
Mediomastus californiensis
Glyceroidea
Glyceroidea sp.
Family Glyceridae
Glycera convoluta
Family Goniadidae
Family Hesionidae
Hessionella mccallochae
Superfamily
Family Magelonidae
Magelona pitelkai
Magelona sacculata
Family Nephtyidae
Nephtys californiensis
Nephtys parva
Family Nereidae
Neanthes limnicola
Family Orbiniidae
Haploscoloplos spp.
Scoloplos armiger
Family Parionidae
Paraonella platybranchia
Family Phyllodocidae
Eteone dilatae
Family Spionidae
Scolelpsis cirratulus
Polydora spp.
Pygospio californica
Spio filicornis
Family Syllidae
9
Table 1 (continued)
Class oligochacta
Phylum Mollusca
Class Gastropoda
Subclass Prosobranchia
Family Amnicolidae
Fluminicola virens
Family Olividae
Olivella biplicata
Family Pleuroceridae
Goniobasis(=Oxytrema)
plicifera
var. oregonensis
Class Bivalvia
Family Cyrenidae
Corbicula manilensis
Family Myidae
Cryptomya californica
Family Solenidae
Siliqua patula
Family Sphaeriidae
Pisidium spp.
Family T'errenidae
Macoma balthica
Phylum Arthropoda
Subphylum Mandibulata
Class Crustacea
Subclass Ostracoda
Subclass Cirrepedia
Family Balanidae
Balanus amphitrite amphitrite
Subclass Malacostraca
Superorder Peracarida
Order Mysidacea
Family Mysidae
Archeomysis grebnitzkii
Neomysis mercedis
Order Cumacea
Family Diastylidae
Diastylopsis dawsoni
Order Isopoda
Suborder Flabellifera
Family Sphaeromatidae
Bathycopea daltonae
Gnorimosphaeroma oregonensis
Tecticeps convexus
Suborder Valifera
Family Idoteidae
Mesidotea(=Saduria) entomon
Suborder Epicaridae
Family Bopyridae
Argeia pugettensis
10
Table 1 (concluded)
Order Amphipoda
Suborder Gammaridae
Family Atylidae
Atylus tridens
Family Corphiidae
Corophium brevis
Corophium salmonis
Corophium spini corne
Family Gammaridae
Anisogamrnarus confervicolus
Family Haustoriidae
Eohaustorius estuarius
Eohaustorius sawyeri
Eohaustorius washingtonianus
Family Lysianassidae
Hippomedon denticulatus
Family Oedicerotidae
Monoculodes spinipes
Family Phoxocephalidae
Pfandibulophoxus uncirostrata
Paraphoxus milleri
Superorder Eucarida
Order Decapoda
Suborder Natantia
Family Crangonidae
Crangon franciscorum
Crangon stylirostris
Suborder Reptantia
Family Callianassidae
Callianassa californiensis
Family Cancridae
Cancer magister
Cancer oregonensis
Class Insecta
Order Odonata
Family Gomphidae
Gomphus spp.
Order Diptera
Family Chironomidae (=Tendipedidae)
11
TABLE 2
Sediment texture data for samples taken in the Columbia River estuary
31 August 1975 to 22 January 1976. Phi () values represent sediment
particle size groups as follows: > 1.000 mm (4=0); 0.500 mm-1.000 mm
(e=1); 0.250 mm-0.500 mm (=2); 0.125 mm-0.250 mm (=3); 0.063 mm0.125 mm (=4); < 0.063 mm (+=5). Table 4 of Higley and Holton (1976)
presents an earlier version of these data.
SAMPLE
SIZE CLASS (%)
1.000MM
0.50CMM-1.000MM
C.25C1M-0.500MM
0.125MM-C.256MM
0.063MM-0.125MM
< 0.063MM
INMAN VALUES
MEDIAN
61.2
12.2
1.7
58.3
9.0
17$14
1.17
47.9
46.0
4.2
1r6
2.01
2.15
0.50
1.0
5.2
.5
.5
.5
3.5
65.7
25.4
1.9
39.1
2.6
54.7'
23.2
2".2`'--
71.9
6.3
.1
0
0
0
43.7
78.5
52.5
18.4
58.9
37.0
2
!.T
1.77
1.93
0.34
1.88
2.21
0.30
3.4
2.06
2.07
0.42
1.1
5(A)
0
0
1.97
2.26
0.36
6(A)
6(9)
7(4)
7(9)
8(A)
8(9)
10(A)
0
.7
1.4
1.0
0
.3
0
.4
45.7
2.0
.9
53.9
42.9
3.3
.1
3.3
2.6
1.4
9.3
.6
.3
C
.7
1.8
.7
8.9
.6
0
9.7
9.7
30.4
14.7
47.0
MEAN
1.95
2.20
2.04
2.11
STAND. DEV.
0.27
C.54
SAMPLF
.2
0
.2
4(8)
5(9)
SIZE CLASS M
INMAN VALUES
MEDIAN
0
0
15.7
24.9
0.54
0.125MM-0.250MM
0.063MM-0.125MM
S C.0F34M
.3
0
0
STAND. DEV.
0.2SCMM-C.500MM
4(A)
0
0
2.61
3.17
1.000MM
3(9)
2(A)
2.29
2.39
0.500MM-1.000MM
3(A)
1(9)
MEAN
SAMPLE
2(91
1(A)
11(4)
26.3
61.3
77.6
43.5
0
10.5
60.5
7.6
20.8
10(8)
6.7
74.6
74.7
46.5
8.8
16.6
.9
19.9
.6
37.1
3.0
4.4
1.74
1.81
0.38
1.80
1.91
0.41
2.E8
11(9)
13(A)
13(9)
15(A)
15(91
16(A)
16(8)
0
0
0
0
0
0
0
0
0
0
C
0
18(A)
SIZE CLASS (Z)
1.0004M
0.500MM-1.000MM
0.250MM-0.500MM
0.125M4-0.250MM
0.063114-0.125M4
5 0.0634M
INMAN VALUES
MEDIAN
MEAN
STAND. DEV.
0
0
77.2
20.1
.3
2.4
1.95
2.05
0.16
2.2
75.3
16.3
.3
5.9
1.73
1.94
0.47
66.8
29.9
1.0
2.7
1.97
2.15
0.25
69.0
26.2
.8
4.0
1.97
2.16
0.26
12
0
3.0
0
26.8
63.0
55.7
54.4
42.9
.8
42.4
31.6
5.4
39.7
5.9
2.6
14.2
.3
0
4.9
2.16
2.23
0.36
1.9
1.94
2.18
0.26
8.6
11.5
1.90
2.34
2.16
2.56
0.42
0.62
79.4
Table 2 (continued).
SAMPLE
SIZE CLASS (%1
1.0COMM
0.501-MM-1.000MM
0.25CMM-0.500MM
0.i25MM-0.25GMM
0.053M4-0.125MM
< C.G63MM
INMAN VALUES
Mc0IAN
19(31
21(A)
2.5
.6
2.4
6.1
0
0
72.4
6.2
.3
37.0
59.6
12.3
1.3
3.7
82.a
12.21
4.3'
3.9
.3
1.82
1.96
0.44
2.11
2.11
0.41
.6
1.2
1.61
1.74
0.E7
STAND. OE V.
5175 CLASS (7.)
1.000MM
0.50GMM-1.900MM
C.25CMM-0.400MM
0.1?5MM-0.250M4
0.063MM-0.125MM
C 0.963MM
INMAN VALUES
MEDIAN
MEAN
STAND. DEV.
SA"PLE
SIZE CLASS (%)
1.006rM
0.53CYM-1.OOOMM
0.25CMM-0.500MM
0.125MM-0.250MM
0.0631IM-G.125MM
S C4063MM
INMAN VALUES
MEDIAN
MEAN
STAND. DEV.
22(A)
.3
73.6
20.7
MEAN
SAMPLE
2119)
26(A)
26(9)
27(A)
.2
.2
40.6
48.8
8.0
0
.3
49.0
45.2
5.5
.3
.5
2.2
2.09
2.21
0.52
39(3)
.4
0
.6
36.0
51.6
11.4
3.22
3.27
0.60
6
2.01
2.08
6.53
50.2-
36.9
11.1
1.0
1.99
2.21
0.63
22(R)
C
.2
56.3
40.5
2.5
.5
23(A)
23(8)
25(A)
1.8
.9
1.8
3.2
20.8
71.5
1.3
1.3
1.3
3.6
19.6
72.9
?.9
2.86
1.92
1.90
0.38
27(9)
28(A)
28(9)
29(A)
29(81
30(A)
4.8
56.7
.2
.5
2.2
48.4
0
4.5
4.9
54.2
14.6
16.4
7.3
2.2
5.3
.3
.6
5.7
3.8
.8
2.5
53.4
37.5
3.9
1.9
1.91
1.99
2.21
0.54
28.9
1.93
0.61
39.5
1.96
2.00
0.58
33(A)
33(81
0
.3
5.0
10.2
2.2
3.2
79.5
.7
.7
0
0
15.8
62.4
29.4
53.3
15.5
2.8
2.53
2.43
0.30
6.7
2.58
2.52
3.47
70.3
6.9
.4
7.2
1.49
1.45
0.43
13
14.1
0
2.0
1.62
1.62
0.38
1E.5
3.9
2.48
2.55
0.59
2.33
2.52
0.56
0
1.1
32.2
55.3
11.4
3.25
3.27
0.60
1.30
32(81
6.7
9.8
10.2
8.5
71.6
-0.08
32(A)
77.4
8.1
2.99
0.68
31(9)
.8
2.0
.5
2.0
48.6
26.0.
21.0
3.CO
31(A)
.3
6.7
93.4
7.5
2.1
.5
2.1
54.5
76.7
13.3
25(8)
0.59
34(A)
34(8)
1.2
.8
3.3
24.7
47.3
22.7
.9
.9
13.8
55.4
22.4
6.6
3.24
2.62
2.70
0.69
Table 2 (concluded).
SAMPLE
SIZE CLASS (7,1
1.000MM
0.50CMM-1.100MM
0.2501'4,-0.500MM
0.125MM-O.?50MM
0.063MM-0.125MM
0.063MM
INMAN VALUES
MEDIAN
MEAN
STAND. DEV.
SAMPLE
SI7E CLASS f7.)
> i.000MM
0.50LMM-1.100MM
C.25CM4-0.500MM
0.125MM-0.?50MM
0.063MM-0.125MM
0.0634M
INMAN VALUES
MEDIAN
MEAN
STAND. DEV.
SAMPLE
SIZE CLASS (7.)
1.000MM
0.590MM-1.000MM
0.250MM-0.500MM
0.125MM-0.250MM
0.963MM-0.125MM
C.063)M
INMAN VALUES
MEDIAN
MEAN
STAND. 0EV.
SAMPLE
SI7E CLASS (%)
> 1.7CCrM
0.500MM-1.^OOMM
0.250MM-0.500MM
0.12F',M-0.250MM
0.063MM-0.125MM
O.CE3MM
INMAN VALUES
S
MEDIAN
MEAN
STAND. DEV.
35(A)
35(4)
.3
.3
23.4
56.7
16.2
3.1
.3
20.3
57.9
15.E
5.7
2.39
2.47
0.63
0
2.39
2.56
0.E6
36(A)
3619)
37(4)
37(3)
33(A)
38(9)
40(A)
.3
.1
1.0
67.6
24.7
6.3
.2
.2
.9
.4
.4
1.7
57.1
31.2
9.2
9.0
10.5
56.2
23.8
4.4
11.7
57.2
19.5
.5
6.7
.1
63.9
28.4
1.3
6.1
7.q
55.7
26.2
9.9
2.94
2.87
7.42
2.75
2.92
0.71
.3
1.7
51.0
29.4
16.7
2.98
3.26
0.81
2.96
2.97
0.53
40(0)
41(A)
41(91
42(A)
42(9)
100(41
0
5.7
.g
.9
3.4
30.3
44.8
19.8
.2
0
q
0
42.5
45.5
3.4
8.3
23.3
16.5
52.2
26.1
2.1
3.1
2.0
4.9
19.9
23.0
44.4
1.63
1.72
0.73
3.17
2.13
2.28
0.58
61.3
4.6
i0.3
2.42
2.39
0.51
.5
0
1.55
1.47
0.70
101(A)
101(6)
0
0
0
0
9-
0
18.2
71.4
7.0
3.4
2.42
2.42
0.46
14.3
75.1
5.9
1.7
2.43
2.43
0.40
102(31
103(A)
103(3)
104(A)
104(9)
105(A)
0
0
0
.3
.1
4.1
79.6
12.9
4.0
.3
.1
0
0
4.5
10.6
71.2
11.7
.3
1.7
54.9
41.7
1.6
1.q
1.44
2.22
0.30
106181
1.C
4.9
39.0
47.1
2.9
5.0
2.08
2.11
0.62
31.3
62.9
2.E
3.3
2.24
2.26
0.46
.4
3.3
77.0
14.0
4.5
2.51
2.66
0.37
2.60
2.74
0.35
0
40.0
54.5
3.8
1.6
2.13
2.20
0.47
17.7
76.8
3.6
1.9
2.37
2.37
0.39
107(4)
107(9)
109(4)
1C 9(A)
110(4)
0
0
0
.5
4.6
14.0
6.0
16.6
70.1
8.7
85.0
.3
1.1
40.2
47.3
.1
6.2
93.9
7.9
1.9
2.54
2.43
0.32
8.9
1.0
4.6
0
2.47
2.42
0.42
1.57
1.59'
0.26
14
59.9
15.7
.8
1.6
1.55
1.51
9.67
1.89
2.07
0.51
100(61
102(A)
0
1.63
1.72
9.72
.2
6.7
4.5
2.04
2.14
0.54
1.62
1.49
0.45
C..
40.8
47.7
9.2
3.3
2.L6
2.35
0.41
105(9)
.9
5.6
80.2
10.0
.2
3.1
1.46
1.58
0.32
Q
15.4
72.2
10.4
2.0
2.47
2.43
0.43
106(A)
.1
1.0
44.6
42.9
2.7
8.6
2.09
2.27
0.57
Table 3
Densities (number/m2) of benthic taxa and sampling information for
samples taken in Columbia River estuary, 31 August 1975 to 22 January
1976. Water depth is ship's fathometer reading, uncorrected for
transducer depth (about 1 m) or tidal stage. Sample depth was measured
at deepest point (center of sampler jaws). The fraction of each sample
counted is shown. Also indicated is treatment of sand and rubble residue
X = not flushed;
if animals were concentrated by the flushing technique:
T
all residue examined for organisms; 0 = none of residue examined;
C
residue fraction > 0.991 mm examined; F = residue fraction 0.425-
0.991
mm
examined.
Table 4 of Higley and. Halton (1976:)
earlier version of these data.
15
Table 3.
Densities of benthic taxa.
SAMPLE
WATER DEPTH (M)
SAMPLE DEPTH (CM)
FRACTION COUNTED
ER CHECK
1A
IC.7
18
2A
11.0
7
SO
1.J0
X
5.5
9
1.C0
28
6.1
12
10
1.30
34
12.2
1..01.00
38
48
LA
11.3
11
1.00
3.7
19
1.C3
4.C
19
C.25
X
X
X
X
X
X
X
37
19
28
94
65
37
37
TAXON
NEMERTEA
NFM_RTEA SPP.
9
PCLYCHAETA
AMPHICTEIS FLCRI0U5
CAPITELLA CAPITATA
CAPITELLA SPP.
37
9
ETEONE SP°.
GLYCEPA CONVOLUTA
GLYCEROIDEA SFP.
9
9
9
9
56
9
19
9
GONIAOIOAE SPP.
HAPLOSCOLOPLOS SPP.
IiESIONELLA NCCALLOCHAE
MAGELONA PITELK4I
MAGELONA SACCULATA
MEDIOMASTUS CALIFOr2NIENSIS
NEPHTYS PARVA
ORBINIIDAE SFP.
POLYDORA SPP.
SCOLELPSIS CI RATULUS
SCOLOPLOS 4RMIG=R
SPIO FILICORNIS
SYLLIOAE SPP.
POLYCHAZTA SPP.
28
9
19
28
28
56
28
411
9
0
9
19
9
9
9
290
9
19
9
28
75
19
150
9
9
9
131
196
9
37925
1738
2159
860
47
BIVALVIA
MACOMA 3ALTHICA
MACOM4 3ALTHIC4 JUVENILE
SILIQUA PATULA
9
4YSIOACEA
ARCHEOMYSIS GRE3NITZKII
9
9
47
CU44CEA
OIASTYLOPSIS CAWSONI
28
ISOPOCA
9ATHYCOPEA OALTONAE
TECTICEPS CONVEXUS
19
MONOCULOOES SFP.
PARAPHOXUS MILLERI
9
19
GASTROP00A
OLIVELLA 3IPLICAT4
MONOCULODES SFINIPES
19
9w
OLIGOCHAETA
OLIGOCHAETA SP-.
AMPHIPODA
ANISOGAMMARUS SPP.
COROP4IUM SALMONIS
COROPHILM SPINICORNE
EOHAUSTORIUS SAWYERI
EOHAUSTORIUS WASH INGTCNIANUS
HIP°OMEDON QENTICULATUS
MANOI3ULOPHOXUS UNCIRCSTRATA
37
9
19
19
9
9
9
9
9
9
94
140
215
234
47
65
374
19
9
65
168
9
9
9
9
9
9
9
65
234
372
522
9
56
DEC4000A
CANCER MAGISTER
CRANGON STYLIROSTQIS
TOTAL
9
9
9
980
661
16
672
418
433E2
15653
Table 3.
Densities of benthic taxa (continued)
SAMPLE
WATER OEPTH (M)
SAMPLE DEPTH (CM)
FRACTION COUNTED
ER CHECK
5A
.9
8
1.00
X
58
.9
7
0.50
X
6A
2.4
7
1.70
X
63
2.7
19
0.25
X
7A
3.4
15
t.25
X
73
3.4
14
0.25
A
8A
83
10.1
11.3
18
3.50
X
19
L.25
X
TAX ON
NEMERTEA
NEMERTEA SPp.
28
860
94
48b
19
NEMATOOA
NEMATOOA SPP.
1131
91477
9
37
1234
DCLYCHAETA
r4
AMPHICTEIS FLCRIOUS
BARANTOLLA AMERICANA
CAPITELLA CAPITATA
CAPITELLA CAPITATA OCLLATA
ETEONE 3PO.
GONIAOI'JAE SPP.
HAPLOSCCLOPLOS SPP.
MEOIOHASTUS CALIFORNIENSIS
NEANTHES LIMNICOLA
NEPHTYS PARVA
FOLYOORA SPO
SCOLELPSIS CIFRATULUS
37
37
37
9
224
187
916
636
19
19
56
56
37
224
94
262
150
75
37
140
112
47
150
75
37
1383
2243
37
84
131
37
19
37
EPIC FILIC0RNIS
1084
299
75
710
449
OLIGOCHAETA
OLIGOCHAETA SPp.
94
19
59542
1271&3
9IVALVIA
CORIICULA MANILENSIS JUVENILE
486
CF,YPTOMYA CALIFORNICA
MACCMA
MACOMA
3ALTHICA
3ALTHICA JUVENILE
BIVALVIA JUV
187
271
187
393
1645
19
9
19
168
112
37
75
748
187
37
CIRREPED IA
BALANUS AMPHITRITE AMPHITRITE
MYSIOACEA
NEOMYSIS MERCEDIS
299
37
9
AMPHI000A
ANISOGA'MMARUS SPP.
COROPHIUM 3REVIS
COROPHIUM SALMONIS
EOHAUSTCRIUS ESTUARIUS
EOHAUSTCRIUS SPP.
112
794
1309
28
75
19
75
MONOCULOOES SFP.
PARAPHOXUS MILLERI
224
37
37
37
19
75
84
37
3289
7223
37
DEC 40004
CALLIANASSA CALIFORNIENSIS
CALLIANASSA SFP.
TOTAL
1513
1684
17
61411
220559
170
2692
Table 3.
Densities of benthic taxa (continued)
SAMPLE
10A
109
DEPTH (M)
SAMPLE DEPTH (CM)
FRACTION COUNTED
18.3
20.1
WATER
ER CHECK
l1A
118
5.5
5.5
13
11
1.00
1.00
18
0
0
327
37
47
28
37
37
252
75
9
9
19
112
9
1.00
T
0.50
T
13A
1.5
8
138
15A
0
4
1.00
4.6
8
1.C0
1.G0
X
A
X
131
75
19
19
19
19
37
159
.4.9
14
.1.uu
T
TAYON
NEMERTEA
NEMERTEA SPp.
153
NEMATOOA
NEMATOOA SPO.
PDLYCHAETA
AMPHICTEIS FLCRICUS
CAPITELLA SPP.
ETEONE OILATAE
ETEONE SPO.
HAPLOSCOLOPLOS SPP.
NEANTHES LIINICOLA
NEPHTYS CALIFCRNIENSIS
PARAONELLA PLATYBnANCHIA
SCOLELPSIS CIFRATULUS
SPIO FILICORNIS
W5
19
56
19
290
19
9
9
206
75
47
37
65
9
2.6
56
19
19
9
75
SYLLIOAE SPP.
19
75
9
9
OLI GOC HA =TA
CLIGOCHAETA SPP.
19
9
19
243
84
168
159
14G
224
65
243
47
112
29
9IVALVIA
MACOMA 3ALTHICA
MACOMA PALTHICA JUVENILE
374
BIVALVIA JUV
28
MYSIDACEA
APCH_GMYSIS GRS3NITZKII
MYSIDAE SPP.
47
9
94
37
19
19
ISGPOOA
GNORIMOSPHAERCM4 OREGCNENSIS
AMPHIPODA
ANISOGAMMARUS SPP.
COROPHIUM SALMONIS
COROPHIUM SPP.
ECHAUSTCRIUS ESTUARIUS
ECHAUSTORIUS WASHINGTCNIANUS
EOHAUSTCRIUS SPp.
MONOCULODES SPINIPSS
MCNOCULOOES SPP.
PARAPHOXUS MILLERI
19
47
19
953
1467
47
84
9
9
9
28
56
1159
1GC9
9
19
9
28
9
9
56
9
19
9
DECAPODA
CANCER MAGISTER
CANCER OREGONENSIS
CRANGON STYLIROSTRIS
TOTAL
215
9
9
75
19
9
9
9
831
381
'18
260
357
2561
1990
Table 3.
Densities of benthic taxa (continued)
SAMPLE
16A
168
18A
8
7
19
2.7
NAT ER DEPTH (M)
SAMPLE DEPTH (CM)
FRACTION COUNTED
0.50
x
ER CHECK
2.7
2.1
J.50
C.25
x
x
i89
2.4
19
3.25
214
11.0
17
1.C0
22A
9
12
11.0
1.00
4.6
223
4.6
11
1.C0
i.G0
0
x
x
131
65
37
19
178
570
1196
963
19
19
682
0
T
218
TAXON
NEMERTEA
37
NEMERTEA SP°.
NEMATOOA
NEMATOOA SPP.
879
561
82916
19
75
37
POLVCHAETA
AMPMICTEIS FLCRIOUS
CAPITELLA CAPITATA
19
CAPITELLA SPP.
ET£ONE SPP.
HA°LOSCCLOPLOS SPP.
NEANTHES LIINICOLA
2C6
262
75
19
NEPHTYS PARVA
POLYOORA SPP.
9
47
65
'
0LI000HAETA SPP.
3140
6935
21159
62094
430
2505
75
112
3645
IVALVIA
MACOMA 9ALTHICA
206
MACOMA 3ALTHICA JUVENILE
BIVALVIA JUV
M
9
75
19
OLIGOCHA:TA
S
37
523.
19
PYGOS?IO CALIFORNICA
SCOLELPSIS CIRRATULUS
SPIC FILICORNIS
28
47
3327
75
4355
47
47
290
112
37
28
9
56
636
YSI)ACEA
ARCHEOMYSIS GRE3NITZKII
9
9
I SOPOOA
A
GNORIMOSPHAEPCMA OREGCNENSIS
19
MPHIP00A
ANISOGA'IMAR'JS SPP.
COROPHILM SALMONIS
EOHAUSTCRIUS ESTUARIUS
19
56
4
56
65
112
122
140
171L
6185
IC 46
1197
9
ECA°OOA
CPANGON FRANCISCORUM
TOTAL
9
19
PARAPHOXUS 4ILLERI
O
9
9
3371
12503
19
24524
149412
Table 3.
Densities of benthic taxa (continued)
SAMPLE
WATER DEPTH (M)
SAMPLE DEPTH (CM)
FRACTION COUNTED
ER CHECK
23A
1.2
10
0.25
X
239
1.2
9
0.25
x
25A
2.1
264
1.2
13
13
G.25
1.00
x
x
258
2.1
13
19.25
x
268
1.2
11
1.00
x
27A
2.0
9
1.6c
T
273
1.8
1:
..50
0
T4XON
NEMERTEA
NEMERTEA SPP.
NEM4T004
NFM4TOOA SPP.
POLYCHAETA
AMPHICTEIS FLCRICUS
ETEONE SPP.
NEANTHES LI-INICOLA
19
860
1346
19
37
664
262
720
19
523
1009
112
5533
2168
2056
935
1G3
710
1443
224
935
10019
15888
8935
271
10280
224
673
542
636
224
OLIGOCHAETA
OLIGOCHAETA 5P0.
BIVALVIA
MACOMA 3ALTHICA
MYSIDACEA
NEOMYSIS MERCEOIS
MYSIDAE SPP.
9
37
47
AMPHIPOOA
ANISOGAPMARUS SPP.
COROP41UM SALMONIS
COROPHtUM SOINICORNE
COROPMIUM SPP.
EOHAUSTCRIUS ESTUARIUS
EOHAUSTCRIUS SPP.
112
19
2056
4636
16280
5486
9009
16075
3579
1972
MCNOCULOOES SPINIP°_S
AMPHIPODA SPP.
TOTAL
7234
449
6383
30440
2365
869
37
19
33533
20
18953
244916
29355
5664
10C9
9
37
21608
19
17748
4655
8692
Table 3.
Densities of benthic taxa (continued)
SAMPLE
284
288
29A
1.4
.9
14
13
6
WATER CEPTH (M)
SAMPLE DEPTH (CM)
1.4
FRACTION COUNTED
0.50
ER CHECK
0
J.50
0.50
299
30A
13
0.50
13
G.50
.9
.9
303
31A
i3
14
13
1.03
1.00
.9
0.50
T
6449
336
336
131
75
9
7495
3514
2701
1897
9
9
84
X
430
5028
19
19
355
4103
4243
37
94
271
94
94
C
C
56
19
37
131
1.2
X
X
0
319
1.5
TAXON
NEMERTEA
NEMERTEA SPP.
NEMATOOA
NEMATODA SPP.
19
POLYCHAETA
CAPITELLA SPP.
HAPLOSCOLCPLOS SPP.
19
19
19
NEANTHES LI:iNICOLA
SPIO FILICORNIS
19
OLIGOCMAETA
OLIGOCHAETA SPP.
467
GAS TROP O !.A
FLUMINICOLA VIRENS
GONIOBASIS PLICIFERA OREGONENSIS
19
56
112
GASTROPOOA SPP.
31VALVIA
COR3ICUL.A MANILENSIS JUVENILE
37
5.6
BIVALVIA JUV
19
112
9
654
OSTPACODA
112
OSTFACOOA SPP.
MYSI')ACEA
NEOIYSIS 14ERCE9IS
MYSIOAE SPP.
19
9
ISOPODA
GNORIMOSPMAERCMA OREGONENSIS
AMPHIP00A
COROPHIUM SALMONIS
COROPHIUM SPP.
EOHAUSTCRIUS ESTUARIUS
EOHAUSTCRIUS SPP.
INSECTA
CMIPONOMIDAE SPP.
TOTAL
19
75
9701
7383
19
5533
206
1495
1065
262
75
19
94
8318
12935
10357
7GL0
1299
5542
9
19
19
10394
37
8283
21
10198
10C73
9167
Table 3.
Densities of benthic taxes (continued)
SAMPLE
WATER DEPTH (U)
SAMPLE DEPTH (CM)
FRACTION COUNTED
ER C4ECK
42A
.6
0
0.50
x
428
.6
15
3.50
x
iacA
8.2
iGOB
8.5
7
5
1.00
x
ICIA
7.6
8
1.00
1.00
1uiB
132A
7
9
6.7
1.70
x
x
x
19
28
19
6.1
1.0
r
1C23
6.1
7
1.C3
h
TAXON
NEM£QTEA
NEMERTEA SPP.
37
9
NEMATODA
NEMATODA SPm.
8299
2467
PLATYHELMINTHES
TUR9ELLARIA SPo.
9
PCLVCHAETA
AMPHICTEIS FLCRIDUS
CAPITELLA SPP.
ETEONE SPP.
HAPLOSCOLOPLOS SPP.
MAGELONA SACCLLATA
NEANTHES LIINICOLA
NEPHTYS CALIFC2NIENSIS
19
19
9
9
9
9
1888
9
9
2449
28
NEPHTYS PARIA
SCOLELPSIS CIi.RATULUS
SPIO FILIC0,2NI$
SYLLIDAE SPP.
9
9
28
28
9
47
159
159
243
94
140
215
75
9
9
19
OLIGOCHAETA
0LIGOCHAcTA SFP.
4860
5570
BIVALVIA
MACOMA 9ALTHICA
19
28
MYSIDACEA
MYSIOAE SPP.
19
ISOPOOA
AFGEIA PUGETTEMSIS
19
GNORIMOSPHAERCMA OREGONENSIS
19
19
ISOPODA SPP.
9
AMPHIPODA
ATYLUS TRIDENS
ATYLUS SPv.
COROPHILM SALMONIS
COROPHILM SPII.ICORNE
COROPHILM SPP.
EOHAUSTCRIUS iSTUARIUS
EOH4USTCRIUS FASHINGTONIANUS
75
1869
28437
28
9
19
9
9
24860
56
19
MONOCULODES SPINIPES
MONOCULCOES SPP.
PARAPHOXUS MILLERI
9
9
131
9
19
178
215
9
9
9
DECAPODA
CRANGON STYLIROSTRIS
TOTAL
43159
37271
24
205
364
598
9
9
9
476
336
363
Table
3.
Densities of benthic taxa (continued)
SAMPLE
WATER DEPTH (M)
SAMPLE DEPTH (CM)
FRACTION COU4TEO
ER CHECK
103A
7.0
5
1.00
1039
7.0
104A
4.6
1.48
4.4
1G5A
4.9
11
7
14
10
1.00
1.00
1.G0
1.00
IC59
4.9
1064
4.6
15
14
1.00
1:68
7.6
17
1.70
1.00
X
X
X
X
C
0
T
0
56
84
28
56
47
84
84
19
9
9
TAXON
NEMERTEA
NEMRTEA SPP.
HEMATOOA
POLYCHAETA
ETEONE SPP.
HAPLOSCOLCPLOS SPP.
NEANTHES LI`1NICOLA
POLVOORA SPP.
SCOLELPSIS CIFRATULUS
37
19
75
23
37
243
28
47
9
65
280
28
9
9
9
9
SPIO FILICORNIS
65
CLIGOCHAETA
OLIGOCHAETA SPD.
196
262
9
19
65
9
19
94
3IVALVIA
TACOMA 3ALTHICA
MACOMA 3ALTHICA JUVENILE
280
28
NEMATODA SPP.
19
150
19
9
28
9
84
BIVALVIA JUV
9
MYSIDACEA
ARCHEOMYSIS GRE3NITZKII
NEOMYSIS MERCcDIS
MYSIOAE SPP.
37
75
28
9
9
9
9
178
AMPHT_PODA
ANISOGAPMARUS CONFERVICOLUS
ANISOGAPMARUS SOP.
COROPHIUM 3REVIS
COROPHIUM SALMONIS
COROPHIUM SPINICORNE
EOMAUSTCRIUS ESTUARIUS
EOHAUSTORIUS SAWYERI
EOHAUSTCRIUS WASHINGTONIANUS
PARAPHO'US 4ILLERI
AMPHIP00A SPP.
9
9
56
9
19
37
19
9
150
37
19
84
19
37
150
122
9
9
75
28
206
9
INSECTA
CHIRONOMIOA= SOP.
9
UNIDENTIFIED
UNIDENTIFIED SPP.
9
TOTAL
9
19
9
9
9
577
851
25
504
495
635
288
662
317
Table 3.
Densities of benthic taxa (continued)
SAMPLE
107A
WATE? DEPTH (M)
SAMPLE DEPTH (CM)
3.7
12
FRACTION COUNTED
ER C4ECK
1078
3.7
1084
5.5
109A
2.4
1.00
12
11
1.00
1.00
x
x
0
112
140
37
9
206
19
14
1.00
110A
1.2
12
1.00
T
C
1514
1518
15
12
1.00
1.00
5.2
T
5.2
F
152A
1.5
12
1..0
X
TAX ON
NEMERTEA
NEMERTEA
SPP.
NEMATOrA
NEMATODA SPP.
65
9
POL YCHAETA
ETEONE SPP.
HAPLOSCCLOPLOS SPP.
NEANTHES LIMNICOLA
75
140
28
131
19
47
150
9
65
19
9
112
215
9
OLIGOCHAETA
OLIGOCHAETA SF°.
9
GASTROPOCA
GASTROPODA SPP.
9
9IVALVIA
COR3ICULA MANILENSIS
COR3ICULA MANILENSIS .,UVENILE
MACOMA 3ALTHICA
MACOMA 3ALTHICA JUVENILE
'
9IVALVIA. JUV
19
56
56
47
37
ANISOGAMMARUS SPP.
COROPHIUM SALMONIS
COPOPHIUM SPP.
EOHAUSTURIUS ESTUARIUS
PARAPHOXUS 4ILLERI
19
9
19
28
710
65
19
9
1298
9
39206
9
3.215
720
75
869
271
INSECTA
CHIRONOMIDAE SPO.
TOTAL
19
19
ISOPODA
MESIDOTEA ENTOMON
AMPHIPOOA
ANISOGAMMARUS CONFSRVICOLUS
19
1271
26
1196
337
19
2C6
19
140
47
103
84
73973
131
122
467
Table 3.
Densities of benthic taxa (concluded)
1528
SAMPLE
1.5
WATER DEPTH (H)
SAMPLE DEPTH (CM)
13
1.00
FRACTION COUNTED
ER CHECK
154A
2.0
2.0
155A
1.5
17
16
11
1.00
1.00
1.C0
0
C
X
1548
G-
TAXON
NEMERTEA
28
NEMERTEA SPP.
NEMATOOA
94
NEMATODA SPP.
POLYCHAETA
NEANTHES LIMNICOLA
748
9
OLIGOCHAEETA
570
215
OLIGOCHAETA SPP.
3IVALVIA
COR9ICULA MANILENSIS
CORIICULA MANILENSIS JUVENILE
9
9
47
47
8IVALVI9 JUV
AMPHIPODA
ANISOGAMMARUS CONFERVICOLUS
COROPHIUM SALMONIS
19
28
COROPHIUM SPP.
EOHAUSTCRIUS ESTUARIUS
37
131
9
935
4907
1600
INSECTA
CHIRONOMIDA_ 5PQ.
355
TOTAL
27
168
37
299
102
8291