Show simple item record

dc.contributor.authorLusardi, Robert A.*
dc.contributor.authorBogan, Michael T.*
dc.contributor.authorMoyle, Peter B.*
dc.contributor.authorDahlgren, Randy A.*
dc.date.accessioned2016-11-22T23:10:07Z
dc.date.available2016-11-22T23:10:07Z
dc.date.issued2016-09
dc.identifier.citationEnvironment shapes invertebrate assemblage structure differences between volcanic spring-fed and runoff rivers in northern California 2016, 35 (3):1010 Freshwater Scienceen
dc.identifier.issn2161-9549
dc.identifier.issn2161-9565
dc.identifier.doi10.1086/687114
dc.identifier.urihttp://hdl.handle.net/10150/621412
dc.description.abstractFlow variability plays an important role in structuring lotic communities, yet comparatively little is known about processes governing assemblage dynamics in stream ecosystems with stable environmental conditions, such as spring-fed rivers. Volcanic spring-fed rivers (hereafter spring-fed rivers) occur in geologically active landscapes of the western USA and around the globe. We sampled invertebrate assemblages and quantified primary productivity and habitat characteristics of spring-fed and runoff rivers in northern California over 4 seasons. We predicted that abiotic factors would be more stable and nutrient availability greater and that invertebrate density would be greater and diversity lower in spring-fed than in runoff rivers. Runoff rivers exhibited high variability in discharge and temperature, whereas spring-fed rivers were relatively stable with high naturally occurring nutrient levels. On average, NO3- and PO43- concentrations were 40x greater in spring-fed than in runoff rivers. Spring-fed rivers supported nearly 7 to 16x greater densities of invertebrates than runoff systems, depending on season. However, invertebrate species richness was greater in runoff rivers in all seasons. Spring-fed river invertebrate assemblages were strongly correlated with elevated nutrient concentrations and basal C sources, whereas runoff assemblages were associated with discharge variability and median substrate size. We suggest that strong differences in abiotic variability between spring-fed and runoff rivers play an important role in determining invertebrate assemblage structure. Because spring-fed rivers exhibit more stable temperatures throughout the year and lower temperatures during the summer than runoff rivers, they may provide essential refugia for coldwater taxa in a warming climate.
dc.description.sponsorshipUS Bureau of Reclamationen
dc.language.isoenen
dc.publisherUNIV CHICAGO PRESSen
dc.relation.urlhttp://www.journals.uchicago.edu/doi/10.1086/687114en
dc.rights© 2016 by The Society for Freshwater Science.en
dc.subjectvolcanic spring-fed riversen
dc.subjectcommunity structureen
dc.subjectabiotic stabilityen
dc.subjectdisturbanceen
dc.subjectnutrientsen
dc.subjectflow regimeen
dc.titleEnvironment shapes invertebrate assemblage structure differences between volcanic spring-fed and runoff rivers in northern Californiaen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Sch Nat Resources & Environmen
dc.identifier.journalFreshwater Scienceen
dc.description.noteONLINE: May 04, 2016en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
refterms.dateFOA2017-05-04T00:00:00Z
html.description.abstractFlow variability plays an important role in structuring lotic communities, yet comparatively little is known about processes governing assemblage dynamics in stream ecosystems with stable environmental conditions, such as spring-fed rivers. Volcanic spring-fed rivers (hereafter spring-fed rivers) occur in geologically active landscapes of the western USA and around the globe. We sampled invertebrate assemblages and quantified primary productivity and habitat characteristics of spring-fed and runoff rivers in northern California over 4 seasons. We predicted that abiotic factors would be more stable and nutrient availability greater and that invertebrate density would be greater and diversity lower in spring-fed than in runoff rivers. Runoff rivers exhibited high variability in discharge and temperature, whereas spring-fed rivers were relatively stable with high naturally occurring nutrient levels. On average, NO3- and PO43- concentrations were 40x greater in spring-fed than in runoff rivers. Spring-fed rivers supported nearly 7 to 16x greater densities of invertebrates than runoff systems, depending on season. However, invertebrate species richness was greater in runoff rivers in all seasons. Spring-fed river invertebrate assemblages were strongly correlated with elevated nutrient concentrations and basal C sources, whereas runoff assemblages were associated with discharge variability and median substrate size. We suggest that strong differences in abiotic variability between spring-fed and runoff rivers play an important role in determining invertebrate assemblage structure. Because spring-fed rivers exhibit more stable temperatures throughout the year and lower temperatures during the summer than runoff rivers, they may provide essential refugia for coldwater taxa in a warming climate.


Files in this item

Thumbnail
Name:
687114.pdf
Size:
887.3Kb
Format:
PDF
Description:
FInal Published Version

This item appears in the following Collection(s)

Show simple item record