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Prairie Basin Wetlands of the Dakotas:
A Community Profile

Tables

Table 4. Invertebrate taxa, maximum densities, and month(s) of observed maximum density in the water column of seasonal and semipermanent wetlands in the Cottonwood Lake study area, Stutsman County, North Dakota, in 1984 (from LaBaugh and Swanson 1988).

Seasonal wetlands Semipermanent wetlands
T8 T3 P1 P8 P11
Basin chemical typea
Specific conductivity (mS/cm)
Dominant emergents (central zone)		 KHCO3
90-144
Polygonum
coccineum-
Carex
atherodes		 CaSO4
728-1350
Scolochloa
festucacea-
Carex
atherodes		 MgSO4
1620-2960
Typha spp.-
Scirpus
acutus		 MgHCO3
797-1120
Typha spp.-
Scirpus
acutus		 NaSO4
3850-7580
Scirpus
maritimus-
Scirpus
acutus
Copepoda
Diacvalops bicuspidatus thomasi 330b (6) 188 (5) 44 (5) 11 (5) 391 (5)
Diaptomus clavipes     141 (8) 5 (7)  
D. sicilis         359 (9)
Copepod naupli 1287 (6) 703 (6) 343 (6) 115 (6) 191 (5)
Canthocamptus sp. 41 (5)        
Macrocyclops fuscus       3 (9)  
Paracyclops fimbriatus poppei       47 (5)  
Cyclopoid copepodids       29 (5) 65 (10)
Cladocera
Daphnia pulex 27 (5) 192 (6) 172 (5) 4 (5)  
D. rosea       17 (7)  
D. similis         449 (6)
Immature Daphnia   4 (7)   6 (6)  
Simocephalus vetulus 21 (6) 6 (7)   Tr.c (6)  
Ceriodaphnia quadranqula   25 (7) 23 (7) 3 (6) 23 (6)
C. reticulata 666 (6)        
Alona quttata 154 (6)        
Pleuroxus procurvatus       Tr. (6)  
Scapholeberis quritus 19 (7) 37 (6)   3 (7)  
Chydorus sphaericus       5 (6)  
C. sp.   4 (6) Tr. (6)   Tr. (5)
Moina macrocalps?          
Rotifera
Keratella quadrata     l (9) Tr. (9) 155 (8)
K. serrulata 81 (6) 2 (6)      
Polyarthra sp. 111 (6) 1 (6,7)   15 (8)  
Lecane sp. 7 (5) 13 (7)   Tr. (10)  
Euchlanis sp. 12 (5) 5 (6) Tr. (5) 5 (5)  
Platyias sp. 22 (7) 18 (7) 8 (8) 5 (7)  
Monostyla sp. 10 (7) 8 (7)      
Conochilus sp. 3 (7) 2 (5)      
Accomorpha sp.   8 (5)      
Asplanchna sp.   1 (7)      
Brachionus sp.       Tr. (9)  
Trichocera sp.     1 (5)    
Notholca accuminata       Tr. (7)  
N. sp.         67 (5)
Synchaeta sp.       2056 (5) 10 (8)
Amphipoda
Hyalella azteca       Tr. (8) 1 (7)
Eubranchiopoda
Anostraca sp. 3 (5) 1 (5)      
Ostracoda sp. 8 (7) 30 (5) Tr. (6) 2 (5) 1 (5)
Hydracarina sp. 3 (6) 1 (7) Tr. (7) Tr. (7)  
Hemiptera
Corixidae sp. 4 (6)        
Notonectidae sp.     Tr. (8) 11 (6)  
Coleoptera          
Dytiscidae sp. 4 (6)   Tr. (7,8,9) Tr. (5)  
Diptera
Chironomidae sp. 12 (5) 1 (7) Tr. (5,7,8)    
Chaoborus sp.   1 (7) Tr. (8,9) 1 (9)  
Ephemeroptera          
Baetis sp.     Tr. (8) Tr. (8)  
Odonata
Zygoptera sp.     Tr. (5)    

aLaBaugh et al. 1987
bDensities are expressed as mean organisms/L (n= 3 samples/month) for the month of greatest abundance. Month of greatest abundance is in parentheses; more than one month is shown where monthly abundances were identical. Seasonal wetlands were sampled 3 times per visit each month from May through July: semipermanent wetlands were sampled 3 times per visit each month from May through October.
cTr.= <1 organism/L.

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