12 Questions 15 Answers 0 Followers
Questions related from Alessandro Manfrin
Dear all, I would like to start a discussion here on the use of generalised mixed effect (or additive) models to analyse count data over time. I reported here the "few" analyses I know in R for...
09 April 2020 825 8 View
Dear all, do you know if: 1 - can I run an RDA with negative (taxa) values (as delta Control - Treatment)? 2 - Do I have to use the function decostand function on these delta values before...
06 March 2018 442 3 View
Dear all, I am struggling to find the best way to analyse my dataset. I have to compare fish diversity in restored and unrestored river sites over time. Fish samples were collected from 80...
21 December 2017 449 3 View
What could be the reason of a massive single-night macroinvertebrate drifting event occurred in an sub-alpine stream after 2 days of a 4 week experiment performed in Mai 2014? Drifting rate of the...
01 August 2017 8,451 5 View
Dear collegues, do you know which procedure should I follow to extract DNA from spider stomach and perform DNA-barcoding? Spiders are preserved under 100% not denaturated ethanol.
13 July 2017 233 2 View
I´m working with insect d13C and d15N isotopes and we all know that insects are composed of a good percentage of chitin. I would be interested in knowing only carbon and nitrogen isotopes...
21 December 2015 1,093 4 View
Dear all, Im working in a field experiment with 20 traps (pitfall traps to collect ground atrhopods) in a treatment field and 20 traps in a reference field (so potentially spatially...
02 December 2015 3,421 2 View
Dear everybody which is the best way to obtain a Goodness of fit in generalized least squares statistic analisys?
29 June 2015 2,364 6 View
Dear eveybody I have a question. I´ll try to explain you my experimental design as clear as I can: - I have 2 treatment sites (ditches) in the same area (but not connected) - I collected oxygen,...
16 January 2015 4,987 8 View
Which kind of modelling could I perform and are there correction factors to apply to such stable isotope values (C and N) due to the trophic level and/or to the fractionation?
04 October 2013 948 2 View
Can I preserve tissue of fishes and insects before performing the stable isotope analysis (for C13 and N15) in not denaturated ethanol 70%?
16 August 2013 4,193 5 View
Dear Colleagues, I was wondering if you could suggest how to analyze insect community (multivariate) data collected across multiple sites and time points. Specifically, I aim to assess differences...
01 January 1970 3,105 6 View
