The indirect response of an aquatic ecosystem to long-term climate-driven terrestrial vegetation in a subalpine temperate lake

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dc.contributor.authorBeck, KKen_AU
dc.contributor.authorFletcher, MSen_AU
dc.contributor.authorKattel, Gen_AU
dc.contributor.authorBarry, LAen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorSaunders, KMen_AU
dc.date.accessioned2021-06-28T20:48:15Zen_AU
dc.date.available2021-06-28T20:48:15Zen_AU
dc.date.issued2017-12-15en_AU
dc.date.statistics2021-06-16en_AU
dc.description.abstractAim To assess whether climate directly influences aquatic ecosystem dynamics in the temperate landscape of Tasmania or whether the effects of long-term climatic change are mediated through the terrestrial environment (indirect climate influence). Location Paddy's Lake is located at 1065 m a.s.l. in temperate north-west Tasmania, a continental island south-east of mainland Australia (41°15–43°25′ S; 145°00–148°15′ E). Methods We developed a new 13,400 year (13.4 kyr) palaeoecological dataset of lake sediment subfossil cladocerans (aquatic grazers), bulk organic sediment carbon (C%) and nitrogen (N%) and δ13C and δ15N stable isotopes. Comparison of this new data was made with a recently published pollen, geochemistry and charcoal records from Paddy's Lake. Results Low cladoceran diversity at Paddy's Lake is consistent with other temperate Southern Hemisphere lakes. The bulk sediment δ15N values demonstrate a significant lagged negative response to pollen accumulation rate (pollen AR). Compositional shifts of dominant cladoceran taxa (Bosmina meridionalis and Alona guttata) occur following changes in both pollen AR and pollen (vegetation) composition throughout the 13.4 kyr record at Paddy's Lake. The δ15N values demonstrate a significant positive lagged relationship to the oligotrophic:eutrophic cladoceran ratio. Main conclusions Long-term changes in cladoceran composition lag changes in both pollen AR and terrestrial vegetation composition. We interpret pollen AR as reflecting climate-driven changes in terrestrial vegetation productivity and conclude that climate-driven shifts in vegetation are the principal driver of the cladoceran community during the last ca. 13.4 kyr. The significant negative lagged relationship between pollen AR and δ15N reflects the primary control of vegetation productivity over within-lake nutrient status. Thus, we conclude that the effects of long-term climate change on aquatic ecosystem dynamics at our site are indirect and mediated by the terrestrial environment. Vegetation productivity controls organic soil development and has a direct influence over lake trophic status via changes in the delivery of terrestrial organic matter into the lake. © 2017 John Wiley & Sons Ltden_AU
dc.identifier.citationBeck, K. K., Fletcher, M.-S., Kattel, G., Barry, L. A., Gadd, P. S., Heijnis, H., Jacobsen, G. E. & Saunders, K. M. (2018). The indirect response of an aquatic ecosystem to long‐term climate‐driven terrestrial vegetation in a subalpine temperate lake. Journal of Biogeography, 45(3), 713-725. doi:10.1111/jbi.13144en_AU
dc.identifier.issn1365-2699en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleJournal of Biogeographyen_AU
dc.identifier.pagination713-725en_AU
dc.identifier.urihttps://doi.org/10.1111/jbi.13144en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10917en_AU
dc.identifier.volume45en_AU
dc.language.isoenen_AU
dc.publisherJohn Wiley & Sons, Incen_AU
dc.subjectQuaternary perioden_AU
dc.subjectEcosystemsen_AU
dc.subjectClimatesen_AU
dc.subjectClimatic changeen_AU
dc.subjectLakesen_AU
dc.subjectPlantsen_AU
dc.subjectFiresen_AU
dc.subjectCarbonen_AU
dc.subjectNitrogenen_AU
dc.subjectTasmaniaen_AU
dc.subjectAustraliaen_AU
dc.titleThe indirect response of an aquatic ecosystem to long-term climate-driven terrestrial vegetation in a subalpine temperate lakeen_AU
dc.typeJournal Articleen_AU
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