Several morphometrical methods were evaluated with the purpose of distinguishing individual maple trees by their samaras and to reveal shape trends. Landmarks for geometric morphometrics gave 97- 98% correctly classified trees in a jackknifed confusion matrix from discriminant analysis, fan-positioned ...
Finally, numerous scientific investigations have made use of data from a citizen science program called Journey North (http://www.learner.org/jnorth/), which asks volunteers in North America to report sightings of adult monarchs during the winter [5], during the spring migration [6–8], and...