Gianluca Polgar

8 Questions 43 Answers 0 Followers

Questions related from Gianluca Polgar

Is detrending needed, before computing Moran's Eigenvector Maps? What if the regression produces neg. residuals at small coord. for abundances =0?

When applying their principal coordinates of neighbor matrices (PCNM; Borcard et al. 2002, Ecological Modelling) method to real ecological data, Borcard et al. (2004, Ecology) recommended to check...

04 April 2020 8,897 0 View

In view of the theory of facilitated variation or facilitated evolution (Kirschner&Gerhardt 1998;2005), are adaptations "selected to be" preaptations?

Adaptations correspond to physiological ranges (reaction norms, somatic adaptations). According to the theory of facilitated variation, such dynamic physiological restorations of the phenotype in...

06 May 2018 1,299 24 View

What is the main goal of modeling, and maybe of scientific knowledge tout court?

While ideally aiming at understanding an empirical phenomenon, and at the same time predicting its behaviour, scientists often focus only on one of these two aspects. Is this the dilemma of a...

14 November 2017 6,335 5 View

Do you know of papers (more recent, the better) that include approximations of organism shapes as combinations of geometric solids?

Dear all, I am looking for papers that used approximations of body shapes (animals, plants, etc.) as combinations of geometric solids (e.g., frustums, cylinders, ellipsoids, rotational barrels),...

18 March 2016 10,003 3 View

Do you know examples of intertidal gobies building "U-shaped" burrows?

I am looking for examples from the literature, or personal observations. My idea is that the "U-shape", common in some intertidal filter feeders (e.g. some intertidal polychaetes, some burrowing...

15 March 2016 5,963 8 View

Is there a classification of tidal regimes based on tidal datums relative positions?

Plotting real tidal data from different regions and different tidal reference stations, it is clear that some tidal datums often have the same relative position. Trivial examples are the...

12 March 2016 4,734 1 View

Do molecular biologists use the term 'substitution rate' consistently, when discuss the calibration of a molecular clock?

In a molecular phylogeny of fishes produced using a cytb marker of 704 bp, Sota et al. (2005) (http://www.ncbi.nlm.nih.gov/pubmed/15684588) calibrated an ML clock tree with a node corresponding to...

10 February 2016 6,068 7 View

What are the mainstream questions in the behavioural ecology of prey-predator interactions?

Assume you have an experimental model with a prey and a predator species (e.g. two insects) in your laboratory. What are the major questions awaiting for replies out there?

17 November 2013 219 2 View