Nature

Recently emerged toadlets still have their tadpole tails. (Photo by Bob Armstrong).

On the Trails: Visiting Gustavus and Glacier Bay

I hadn’t been over there for several years, and it was time to refresh some old memories of forest walks and boat or kayak trips… Continue reading

Recently emerged toadlets still have their tadpole tails. (Photo by Bob Armstrong).
A creek runs beside the Mesa Site in northern Alaska. (Photo by Dan Gullickson)

Alaska Science Forum: Pondering the mystery of the Mesa people

Now as quiet as wind whispering through grass, a plateau rising from the flats of northern Alaska was for thousands of years a lookout for… Continue reading

A creek runs beside the Mesa Site in northern Alaska. (Photo by Dan Gullickson)
Western rust fungus can leave a big gnarly lump on pine branches. (Photo by Mary F. Willson)

On the Trails: Flowers, caterpillars and tree foam

Light rain fell as I left the Valley but, as usual, it fell more heavily as I neared the downtown area. Fog lay thick over… Continue reading

Western rust fungus can leave a big gnarly lump on pine branches. (Photo by Mary F. Willson)
A red ant stimulates aphid to produce honeydew. (Photo by Bob Armstrong)

On the Trails: Ants are busy critters

There are more than 20,000 species of ants, including such noticables as picnic ants, sidewalk ants, carpenter ants, and so on. Less noted by most… Continue reading

A red ant stimulates aphid to produce honeydew. (Photo by Bob Armstrong)
A male sockeye salmon makes its way upstream. (Photo by Bob Armstrong)

On the Trails: Life history patterns

Most organisms have one of two basic, genetically programmed life histories. Some can (potentially) reproduce several times during their lives; they are said to be… Continue reading

A male sockeye salmon makes its way upstream. (Photo by Bob Armstrong)
A common aerial wasp forages on cow parsnip flowers. (Photo by Bob Armstrong)

On the Trails: Cow parsnip flowers

Cow parsnip is known in our field guides as Heracleum lanatum, although it sometimes has other names. The flowers are typically displayed in big, flattish… Continue reading

A common aerial wasp forages on cow parsnip flowers. (Photo by Bob Armstrong)
A roadside daisy displays a fasciated center. (Photo by Deana Barajas)

On the Trails: An odd plant malady, a clever duck, and more

I recently learned about a mysterious, relatively rare affliction of plants called “fasciation.” A fireweed plant at the Point Bridget trailhead had not developed the… Continue reading

A roadside daisy displays a fasciated center. (Photo by Deana Barajas)
A bumblebee pollinates the flower of shy maiden, which will turn upward soon afterward. (Photo by Bob Armstrong)

On the Trails: Flowers, showy and otherwise

The spring and summer flower show at Cowee Meadows (way out on the Point Bridget Trail) is always a treat, and the broad uplift meadows… Continue reading

A bumblebee pollinates the flower of shy maiden, which will turn upward soon afterward. (Photo by Bob Armstrong)
Insects like these flies clinging to a tent seem to be in ample supply in Alaska’s boreal forest. (Photo by Ned Rozell)

Alaska Science Forum: Insects of Alaska forest humming along

Recent long-term studies revealed a three-quarters reduction of insects in parts of Germany and an 80 percent decline of pollinating flies at a field site… Continue reading

Insects like these flies clinging to a tent seem to be in ample supply in Alaska’s boreal forest. (Photo by Ned Rozell)
A brush turkey on a mound the size of a car (Flickr.com photo by Doug Beckers /CC-BY-SA-2.0)

On the Trails: Nest-building by male birds

Most birds build some sort of nest where the eggs are incubated. In many species, the female does that job, and in many others both… Continue reading

A brush turkey on a mound the size of a car (Flickr.com photo by Doug Beckers /CC-BY-SA-2.0)
At least one female wood duck has invented a novel feeding technique. (Photo by Bob Armstrong)

On the Trails: Wood ducks, redstarts, yellowlegs and flowers

Mid-June, and a few days ago we saw a wood duck with two tiny chicks on Moose Lake. Another female with two fluffy ones came… Continue reading

At least one female wood duck has invented a novel feeding technique. (Photo by Bob Armstrong)
Barn swallows firmly attach their nests to walls, so they support the weight of nestlings and visiting adults.  (Photo by Bob Amrstrong)

On the Trails: Spring to summer

Spring temperatures were cool this year, but the lengthening days gave birds the signals they needed to start the baby business. By mid-May, a few… Continue reading

Barn swallows firmly attach their nests to walls, so they support the weight of nestlings and visiting adults.  (Photo by Bob Amrstrong)
Brown-headed cowbirds are professional egg-dumpers, always parasitizing the nests of other species. (CC BY 2.0 public domain photo).

On the Trails: Egg dumping behavior

Egg-dumping refers to the behavior of a female who puts her eggs in another animal’s nest, leaving all other parental behavior to the host. Some… Continue reading

Brown-headed cowbirds are professional egg-dumpers, always parasitizing the nests of other species. (CC BY 2.0 public domain photo).
An orange-crowned warbler looks for bugs on a willow (Photo by K.M. Hocker)

On the Trails: Maple flowers and some spring observations

The sun came out! So it was a day for me and a friend to head to the Boy Scout Camp Trail, dodging rain puddles… Continue reading

An orange-crowned warbler looks for bugs on a willow (Photo by K.M. Hocker)
An orca swims beside a boat near Berners Bay on May 12. (Photo by Eric Jorgensen)

On the Trails: Orcas, ducks, warblers and others

I went on the Audubon cruise to Berners Bay in May, on a drizzly, breezy day. On the outbound trip, we enjoyed some of the… Continue reading

An orca swims beside a boat near Berners Bay on May 12. (Photo by Eric Jorgensen)
A porcupine nurses its young one, providing milk. (Photo by Bob Armstong)

On the Trails: Feeding the kids

A parental duty of feeding the offspring can be very expensive in terms of energy expenditure and sometimes risks of predation. Many animals avoid that… Continue reading

A porcupine nurses its young one, providing milk. (Photo by Bob Armstong)
An adult male mountain goat scans the horizon near the Juneau Icefield. (Photo by Kevin White)

Alaska Science Forum: Mountain goats live and die on the edge

Kevin White has placed his hands on the long, white fur of more than 400 Alaska mountain goats during the past 20 years. His diligence… Continue reading

An adult male mountain goat scans the horizon near the Juneau Icefield. (Photo by Kevin White)
A white-crowned sparrow inspects the ground for seeds. (Photo by Bob Armstrong)

On the Trails: Yellow-rumped warblers, white-fronted geese, and white-crowned sparrows

These are some natural history tidbits about three of the several species I’ve enjoyed seeing this spring. Yellow-rumped warblers Usually the earliest warblers to arrive,… Continue reading

A white-crowned sparrow inspects the ground for seeds. (Photo by Bob Armstrong)
Denali stands at 20,310 feet as seen from a commercial flight between Anchorage and Fairbanks. (Photo by Ned Rozell)

Alaska Science Forum: Searching for microplastics on Denali

Two college students will soon be stuffing snow from the slopes of Alaska’s highest mountain into Nalgene bottles. Their goal is to see if that… Continue reading

Denali stands at 20,310 feet as seen from a commercial flight between Anchorage and Fairbanks. (Photo by Ned Rozell)
A Pacific wren sings in the understory. (Photo by Helen Uhruh)

On the Trails: April jaunts

A walk at Fish Creek was productive, as it usually is. The marine side of the point was full of ducks: widgeon, green-wing teal, mallards,… Continue reading

A Pacific wren sings in the understory. (Photo by Helen Uhruh)