Data from: Asynchronous changes in abundance over large scales are explained by demographic variation rather than environmental stochasticity in an invasive flagellate ...

• Main Authors: Trigal, Cristina, Ruete, Alejandro
• Format: Dataset
• Language: English
• Published: Dryad 2017
• Subjects: invasive microalgae; Gonyostomum semen; Raphidophyceae; interannual density dynamics; hierarchical mixed-effects models; Fennoscandian
• Online Access: https://dx.doi.org/10.5061/dryad.685vq; https://datadryad.org/stash/dataset/doi:10.5061/dryad.685vq

Environmental stochasticity is important in explaining the persistence and establishment of invasive species, but the simultaneous effects of environmental and demographic factors are difficult to separate. Understanding how demography and environmental factors affect invasive species abundance over large temporal and spatial scales is essential to anticipate populations at risk of becoming established and setting appropriate management measures. Using a hierarchical mixed modeling approach we analyzed the spatial and interannual dynamics of the invasive raphidophyte Gonyostomum semen, a noxious flagellate which is spreading in northern Europe, in response to demographic and environmental variation. We used data from 76 lakes distributed across two biogeographical regions in Sweden (Central Plains in the south and Fennoscandian region in the north) and sampled during 14 years. We found a strong asynchrony in the density dynamics of G. semen populations between the two regions. G. semen showed positive trends ... : G. semen dynamics over large scalesData were collected in76 lakes sampled annually between 1997 and 2010 as part of the Swedish National Monitoring program. Abbreviated headlines are as follows: "Limes_Norr" = Location south (1) or north (2) of Limes Norrlandicus; "number_cells" = number of cells L-1; "Temp_Aug"= mean temperature in August; "pH_Aug"= pH in August; "NH4-N_Aug" = Ammonia mg L-1 in August; "Tot_N_Aug" = total nitrogen mg L-1 in August; "PO4-P__Aug"= orthophosphate mg L-1 in August; "Tot-P_Aug"= total phosphorous mg L-1 in August; "Abs._F_Aug" = absorbance nm in August; "Temp_April"= mean temperature in April; "pH_April"= pH in April; "NH4-N_April" = Ammonia mg L-1 in April; "Tot_N_April" = total nitrogen mg L-1 in April; "PO4-P__April"= orthophosphate mg L-1 in April; "Tot-P_April"= total phosphorous mg L-1 in April; "Abs._F_April" = absorbance nm in April; "TGSL"= length of growing season as number of days; "area_geom"= total lake surface in ha; "perim_geom"= lake perimeter in Km; ...