|Threespine stickleback (Gasterosteus aculeatus)|
|A representation of stickleback diversity. The marine ancestor is surrounded by various freshwater forms.|
Several weeks ago, I had the opportunity to visit Tom in the field to see Haida Gwaii stickleback for myself. The first lake we visited was Drizzle, where Tom lived for 15 years and worked for 40. Drizzle is a modest-sized (112 ha) and heavily-stained (tannic, the color of very strong tea) lake with large and dark stickleback. A highlight here (besides camping and having a breakfast of bannock beside the lake) was walking the shoreline on Tom’s annual survey of loon-induced stickleback mortality. Several species of loon, particularly common and red-throated loons, congregate on Haida Gwaii lakes like Drizzle in numbers I had not thought possible, despite visiting countless lakes in my life. On Drizzle, dozens of loons would cruise nearby checking us out during our survey. And they would capture stickleback as if on cue – probably dozens were dispatched as we watched. Not surprisingly, many of the stickleback we found on the shore had been captured and killed, but not eaten, by loons. (Of course, many others are eaten - but we obviously can't find those on the shore.) Tom has an effective strategy for motivating search efforts. The person in front gets one point for every dead stickleback found. The following person gets two points. The third person gets three points. Tom was first, then Hannah, then me. Although it was like following two vacuum cleaners – I named one Hoover and the other Roomba – I held my own as tail-end Charlie (on points anyway).
|A common loon with a Drizzle Lake stickleback.|
So we instead hiked into Rouge Lake. This lake is a very shallow and small (1.5 ha) lake in the middle of a bog near the northern end of Graham Island (Drizzle and Mayer are on this same island). Rouge Lake stickleback are exceptional in several respects, especially their frequent lack of one of their dorsal spines, their (until recently) extreme red colour, their occasional possession of two dorsal fins, and the complete fixation of an otherwise locally-rare genetic variant (the Japanese clade of mitochondrial DNA). It was on the way back from this lake, tramping my way through bog behind Tom and three students, that variance smacked me upside the head. Just walking to these few lakes and hearing about (and seeing some of) their stickleback had finally brought home Tom’s assertions about the exceptional variation on Haida Gwaii and, more generally, the exceptional variation that organisms can achieve on very small spatial scales.
|The Abbey Road of stickleback biology – the Rouge Lake trip. (Note: the picture is inverted for a reason that should be obvious.)|
Some other cool Haida Gwaii experiences:
More Haida Gwaii photos: https://www.flickr.com/photos/andrew_hendry/sets/72157645239128218/
|Eagles were everywhere.|
|Bleeding tooth fungus - how cool is that?|
|Sandhill crane in the rain.|
|Native tree frog.|
|Masset, Haida Gwaii.|
|River otters in a tiny rainforest stream.|