Invasive crayfish: drivers or passengers of degradation in freshwater ecosystems?

Invasive species, e.g. the freshwater crayfish Procambarus clarkii, reportedly negatively influence the abundance of various aquatic species. Moreover, these invaders are increasingly linked to ecological degradation of aquatic ecosystems, since invaded habitats show increased levels of turbidity, nitrogen and organic matter concentration. P. clarkii has, among other impacts, been associated with eutrophication in invaded habitats. However, observations indicate that the presence of P. clarkii is often not accompanied by ecosystem degradation, begging the question whether they are drivers of degradation, or function as passive passengers along for the ride driven by other stressors. To test these contrasting hypotheses, we conducted a full factorial experiment in 24 mesocosms with P. clarkii and nutrient pollution (specifically N, P, K), a ubiquitous stressor on aquatic ecosystems. Here we assessed the effects on community compositions of morphologically identified macrophytes and chiro..., Raw output of NGS runs. Methods of sample collection and processes were performed as described in the corresponding manuscript., , **Invasive crayfish: drivers or passengers of degradation in freshwater ecosystems? - raw NGS data**

This dataset includes paired end metabarcoding results (Illumina Miseq v3) using distinct primer sets for bacteria, phytoplankton, and diatoms. Sequences have been demultiplexed and organized per sample and per taxonomic group (bacteria, phytoplankton, and diatoms) as .gz files in FASTQ format.

A .csv file has been included to refer sample name to the corresponding sampling time (represented by the calendar week; ranging between weeks 18-30 in 2019) and applied treatment (N, Cr, CrN, C).

*Abbreviations used in the dataset:*
ALG: The phytoplankton data
BACT: The bacterial data
DIAT: The diatom data
X01-X12: Negative controls
N: Nutrient pollution treatment
Cr: Crayfish treatment
CrN: Combined nutrient pollution + crayfish treatment
C: Control treatment 
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