Photo: Two giraffes by Vera Kratochvil, released to public domain, via publicdomainpictures.net. Two giraffes are definitely better than one.
Ecologists are perennially angst-ridden about sample size. A lot of our work is logistically difficult, involves observations on large spatial or temporal scales, or involves rare species or unique geographic features. And yet we know that replication is important, and we bend over backwards to achieve it.
Sometimes, I think, too far backward, and this can result in wasted effort. Continue reading
Photos: Pulling in a gill net in Vatnshlíðarvatn; and a male arctic charr in spawning colour (S. Heard).
I’ve just come back from gill-netting arctic charr in Vatnshlíðarvatn, a small, shallow lake just west of Varmahlíð in northern Iceland. The charr in this lake are a pair of morphs (a diet specialist and a diet generalist), and the aim was to collect fish of each morph for stable isotope and genetic analysis. It was a sunny July morning (about 7 ºC, which isn’t bad for Iceland), the fish were beautiful, and I enjoyed the work thoroughly.
Those of you who know me are, by now, smelling a rat: I don’t work on fish. Continue reading