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Discoveries on Benjamin and North islands, part 2

Posted: August 11, 2011 - 3:24pm  |  Updated: August 12, 2011 - 6:18am
Seed heads of cow parsnip look a bit like carved roses.   Photo by Kathy Hocker
Photo by Kathy Hocker
Seed heads of cow parsnip look a bit like carved roses.

One of the special treats of our little excursion to Benjamin and North islands was finding ourselves comfortable in shirtsleeves — no jacket needed — even when crawling out of our tents at six in the morning. How often is it that warm in Juneau?!

In addition to enjoying the marine wildlife, we wandered around on both islands, just exploring. We saw one young deer, with a beautiful summer coat of red, and lots of deer sign. Deer had cropped the leaves of false lily of the valley, occasional stems of twisted stalk, and most of the leaves from sapling crabapple trees. A little stand of skunk cabbage had been reduced to ragged nubbins. Fresh water seems to be in short supply, particularly on North Island, so we wondered how deer would get enough water.

We also found skeletal evidence of four long-dead deer, some apparently quite young, leading us to speculate about hard winters in these sites. Two lower jaw bones caused us to query the Alaska Department of Fish & Game when we returned. One of the mandibles we found had four cheek (grinding) teeth in place plus a fifth one just erupting at the back of the jaw. A mature deer lower jaw holds six cheek teeth (three premolars and three molars), and the full set is in place at an age of about two and a half years. The jaw with the just-erupting fifth cheek tooth had belonged to a young deer, perhaps nine to twelve months old, according to ADF&G.

The ground, in some places, was riddled with small holes, just the right size for a red squirrel, but we saw no evidence of current squirrel activity: No busy little fussbudgets chattering at us, no middens of stripped spruce cones and many of the holes had spider webs across the opening. This year, there are huge numbers of spruce cones still on the trees, so food supply for squirrels should be quite decent. We wondered, then, if there had been squirrels here in the past, but perhaps a year or two of poor cone crops had wiped them out.

Among the rocks on the uplifted beach meadows we startled several good-sized voles, which scooted quickly into handy crevices. How did they get to these islands? They can certainly swim well, but it’s a long distance, for a vole, from the mainland to the islands.

As we stood quietly in a beach meadow with a dense population of lupines, we heard tiny tapping sounds and soon discovered the source: Mature lupine pods were explosively twisting open in the hot sun and the dispersing seeds clattered softly down through the surrounding vegetation. At the upper beach fringe, a stand of cow parsnip presented heads of closely packed clusters of maturing seeds. We were fascinated to observe that each little cluster of seeds resembled a rose, carved in wood. So the whole head was, so to speak, a bouquet of wooden roses. Beautiful!

Some very sturdy, squat plants lined the top of one beach, and bore yellow daisy-like blooms. These beach grounsels, with large, spreading leaves, are very specific to this particular habitat type. Each yellow “flower” is really an inflorescence composed of a ring of showy flowers around a disc of many, small, not-showy flowers, altogether forming the daisy-like composite inflorescence. We noticed that ants were visiting the central flowers, presumably sipping nectar. What an odd place to find ants, which don’t seem to be common in Southeast.

On the forest floor were numerous evidences of predation: Three piles of crow feathers (and feet), plus a regurgitated pellet with an intact crow foot. Four piles of gull feathers. Scattered plates of chitons. Sea urchin tests (a.k.a. shells). Some clam shells and small crab legs. Eagles and otters, and perhaps others, had found their dinners.

Other sightings:

• A row of extremely contorted spruces on a raised terrace well inside the present forest edge. What could be their history?

• A dogwood bush, normally shrub-sized, but in this instance sending a long branch or two far up along a spruce trunk, almost like a vine. Apparently its only chance to reach the light was to straggle upward, because the dense thicket of young spruce at the forest edge effectively blocked light from shrub-level.

• An orchid with vanishingly small flowers (with the regrettable name of adder’s mouth), presumably pollinated by insects as tiny as no-see-ums. Could those miserable pests actually have a use?

• Several specimens of slime mold, growing on fallen logs. One kind was white and spongy, the other was yellow and fuzzy-looking. Spending most of their lives as separate cells in the forest floor, upon some unknown signal the cells come together to form the visible mold, and reproduce.

• A family of Pacific/winter wrens in a heap of wind-thrown trees, the young ones curious, the parents wary.

From our perspective, our prowlings were profitable. These little explorations were like treasure hunts in which the treasure is unknown ahead of time, but recognizable when one sees it.

 

• Mary F. Willson is a retired professor of ecology

 

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