Accession Number : ADA106973
Title : A Study of the Invertebrates and Fishes of Salt Marshes in Two Oregon Estuaries.
Descriptive Note : Miscellaneous rept.,
Corporate Author : OREGON STATE UNIV CORVALLIS SCHOOL OF OCEANOGRAPHY
Personal Author(s) : Higley,Duane L ; Holton,Robert L
Report Date : Jun 1981
Pagination or Media Count : 170
Abstract : Sweep nets, corers, enclosures, and clip-quadrat samplers were used to collect both quantitative and nonquantitative samples of invertebrates in level marsh, pan, tidal creek, and tidal flat habitats located in seven study areas representing various types of marsh. Fish in these habitats, as well as in a slough and in bay channels, were sampled by seine and otter trawls. Community taxonomic composition and trophic structure, along with fish stomach contents, are presented as relative frequency histograms and pie charts. Dominant invertebrate taxa in terrestrial collections were Acarina, Homoptera, and Diptera, and in aquatic collections were Capitellidae (polychaeta), Oligochaeta, Gnorimosphaeroma (Isopoda), and Anisogammarus and Corophium (Amphipoda). Three-spine stickleback and young staghorn sculpin were by far the most common fish species throughout the marsh zone; juvenile salmonids and other species were captured only in submerged level marshes and in a slough. Trophic structure of terrestrial and aquatic invertebrate communities was generally heavily weighted to detritivores and scavengers. The herbivore component increased from low marsh to high marsh and was the dominant trophic type in the higher vegetation (sweep net collections) of the high marsh. Araneae was the dominant invertebrate carnivore in the terrestrial communities. Fish consumed primarily aquatic animals, even those captured in tidal creek and submerged level marsh habitats where tidal inundation would be expected to make terrestrial foods available.
Descriptors : *INVERTEBRATES , *FISHES , *OREGON , TABLES(DATA) , CHANNELS(WATERWAYS) , TAXONOMY , SWAMPS , BAYS , ESTUARIES , HABITABILITY , OLIGOCHAETA , ISOPODA , POLYCHAETA
Subject Categories : Biology
Distribution Statement : APPROVED FOR PUBLIC RELEASE