Valérie Coudrain

10 Questions 76 Answers 0 Followers

Questions related from Valérie Coudrain

What is the vertical distribution of soil invertebrates?

I am interested in interactions among soil invertebrates and I would like to have some opinions whereas the localization of soil organisms in the different soil layers may constrain their...

26 February 2015 3,996 4 View

Is it ok to normalize species frequency before randomizing a species community matrix?

I would like to assess the effect of different treatments on the composition of species community matrices. To cancel the possibility that observed community composition is due to chance I would...

06 January 2015 8,798 19 View

What is a good camera to film insects in the field?

I am looking for a possibility to survey insects in the field using video cameras, possibly also at night. Does anybody have some good or bad experience with this kind of survey and some...

30 September 2013 3,093 6 View

How to measure food availability for bees?

Bees may rely on different flower resources that are only temporally available. Therefore mapping the amount of the different used flower types may not provide a correct assessment of the...

02 July 2013 4,354 12 View

Nestedness in host-parasitoid networks: promotes or impairs species richness?

It is generally accepted that plant-pollinator webs are nested and that nestedness promotes species richness in those networks. I've just read a study of Kondoh et al. ("Food webs are built up...

03 June 2013 6,836 6 View

Are parasitoids omnivorous?

A debated question in food-web research is whether omnivory stabilizes or destabilizes species interaction networks. Parasitoids often "consume" species from different trophic levels and their...

19 April 2013 2,999 13 View

How to analyse the effect of a factor on species distribution and a species functional trait?

I would like to investigate the effect of an environmental factor simultaneously on a species abundance matrix and a functional trait related to these species. To be clearer: I have sampled...

06 February 2013 2,462 53 View

Can we compare species diversity (i.e. Shannon, Simpson's) and evenness between sites that have large differences in abundance of individuals?

I would like to know if it is meaningful to compare species diversity and eveness between sites that range from 3 individuals to up to several hundred individuals. Especially for eveness, I have...

15 October 2012 9,717 48 View

What is the best method for pooling food web data?

I have data on quantitative food webs from different sites over three years and three different isolation levels (10 sites for each isolation level). The idea was to look at spatial-temporal...

17 September 2012 8,572 12 View

What is the best method to analyze change in species composition over three years in different sites?

I sampled a community of insects in different sites in three years and I would like to calculate the between site and between year differences respective change in species composition. I do not...

10 September 2012 5,828 44 View