The poet had it right! Although April has often been a benign month here, with lots of sun and rapid warming, this year’s April has (so far) offered us lots of rain and temperatures parked in the forties. Not living up to expectations! Nevertheless, Mother Nature has not forgotten Spring, and things are happening.
The yellow hoods of skunk cabbage are now conspicuous in many damp places, with both male-phase and female-phase flowers available. A little experiment in Washington indicated that the sweet fragrance of the flowering display initially stimulates insect pollinators to search for the flowers, where pollen on male-phase flowers is the chief reward. A more local experiment found that the searching insects land preferentially on displays with the bright yellow hood, rather than those that are still green. The little brown beetles that are the principal pollinators are still scarce (in mid April). But eventually they will appear and come first to male-phase flowers, to feed on pollen and use the inflorescence as a mating rendezvous, and then carrying pollen to female-phase flowers. I have observed that, at any one time, there are usually many more beetles on male-phase than female-phase inflorescences, but on some occasions, there are crowds of beetles on the females too. That pattern suggests that perhaps the females are only fully attractive at certain times, possibly drawing in the beetles by air-borne chemical signals.
The rufous hummers arrived a few weeks ago, one of the earliest arrivals on record. There are rumors that Anna’s hummers, usually just vagrant visitors later in summer, may have overwintered here. If they start to nest here commonly, it will be interesting to see if there is evidence of competition between the two species.
Ruby-crowned kinglets are now cheering human listeners with their rollicking song, even in the rain. I watched a female white-winged crossbill poking about on the ground, selectively choosing certain wisps of grass for a nest lining. In mid April, I heard my first fox sparrow, singing from an alder thicket.
Salmonberry canes with new pink flowers decorated a south-facing upper beach at Auke Rec, and my favorite yellow streamside violets shone against the still-drab forest floor.
Several observations in the Eagle River/Eagle Beach area piqued the interest of a couple of curious naturalists:
–Crows foraged on a mudflat at low tide, finding very small items and gobbling them down. Later, we saw crows exploring the wrack left by a very high tide, extracting mussels and maybe amphipods, and trying vainly to crack the mussels by flying up and dropping them on the too-soft sand.
–An immature herring gull was foraging at the edge of a sand flat, rapidly paddling its feet up and down on the wet sand. This technique was successful in stirring up small organisms, and the gull nabbed one after another. At what age do they learn this mode of foraging?
–There was goose scat that contained seeds of (I think) Canada mayflower, reminding me that geese up on the tundra (and, as I saw, in Tierra del Fuego) commonly eat fruit and disperse the seeds. Geese are generally known as grazers, so this is an added ecological role, shared with bears, thrushes, and some other songbirds.
–A burrow under some tree roots in the sediment bank at the edge of the river had been occupied for some time by a porcupine, which deposited some long white hairs and the usual oval winter pellets (reflecting a diet of bark and needles), as well as more recent, small, dark, round spring pellets (reflecting a shift to soft, fresh, green vegetation). It seems unlikely that the porcupine made this burrow, but it provided a very nice retreat.
–Deer of all sizes had danced on the river sandbars exposed by low-water conditions. We wondered why they spent so much time in that habitat, which offers nothing to eat.
–A little promontory in the river was liberally strewn with the marks of ownership by an otter. There were dozens of small piles of debris, each one topped by a dark, slimy mass. We failed to find a den in this area, although the nearby forest held a number of old, now-unoccupied burrow systems under tree roots.
–As we basked at the river’s edge in some momentary rays, we saw lots of small insects fluttering about. A few landed where we could inspect them, and so we could see that they were stoneflies. Some of them regularly dipped down to touch the water surface, no doubt laying eggs. We wondered how they choose the sites for placing their eggs—what are the cues that indicate a potentially good place?