Lots of creatures are moving on top of Lathrop snow–squirrels, rabbits, raccoons, foxes, and bobcats.
But some tiny black specks you see on the snow might be seeds or dust–until they jump.
These are so-called snow fleas (Hypergastrura nivicola), though they are not fleas. They belong to group of primitive insects called “springtails” (collembola) so named because two small latches hold their tails under their bodies, and when the latches are released, the tails spring out and catapult the snow fleas up to 100 times their own length–like one of us jumping the length of two football fields. Continue reading Critters on the Snow→
Yikes! What is this tender little creature doing now that its world is all frozen?
It’s hunkered down in the leaf litter–frozen. Its heartbeat and breathing have stopped. A special antifreeze keeps its cells from freezing, but ice has formed between its cells.
In early spring, our wood frog will thaw out, emerge from the leaf litter, start eating slugs, worms, bugs, and snails, and, if it’s not picked off by some snake, turtle, raccoon, coyote, fox, or bird, go find the vernal pool it was born in. Though a vernal pool, by definition, has no streams running into and out of it, it fills up in spring with snow melt, rain, and ground water, just in time for frogs to mate. Continue reading “I’m Freezing!”–Literally→
Some of Lathrop’s human residents may be a bit hard-headed, truth to tell, but if you walk on our land these days you may hear our most hard-headed resident–the pileated wood pecker, whose loud drumming or whinnying cry rings through the woods. Crow-size, it’s America’s largest woodpecker. Sharon and I were lucky to see one the other day, energetically pounding away at a dead tree behind our house, it’s red-crested head whamming back and forth, and wood chips flying all around.
Many residents are drawn to Lathrop because of our beautiful forests, and the same is true for our pileated woodpeckers. However, to a woodpecker, the most beautiful tree is a dead one with lots of carpenter ants and other insects burrowed into it. Continue reading Lathrop’s Hard-Headed Residents→
A vernal pool, by definition, has no permanent above-ground outlet. It fills with seasonal rains, and it dries up in late summer, at least every few years.That drying eliminates fish, who otherwise would gobble down small critters like fairy shrimp, wood frogs, and mole salamanders who can survive only in a vernal pool. Many other creatures use vernal pools for food or habitat.
Some creatures spend their whole life in the vernal pool, laying eggs in the bottom that can survive both drying and freezing.Others spend part of their life cycle in the surrounding forest. Marching to the pool to breed, many are crushed crossing roads.Continue reading Lathrop’s Vernal Pools→
Vernal pools are a unique and threatened habitat.Lathrop’s east campus is very fortunate to have two just off the wide woods path, and one on the far side of the mid-woods meadow.
A vernal pool, by definition, has no permanent above-ground outlet. It fills with groundwater and seasonal rains, and it dries up in late summer, at least every few years.That drying eliminates fish, who otherwise would gobble down small critters like fairy shrimp, wood frogs, and mole salamanders, who can survive only in a vernal pool. Many other creatures also use vernal pools for food or habitat.
Some creatures spend their whole life in the vernal pool, laying eggs in the bottom that can survive both drying and freezing.Others spend part of their life cycle in the surrounding forest. Marching to the pool to breed, many are crushed crossing roads.
The National Heritage and Endangered Species Program certifies vernal pools. Federal, state, and local governments protect them with laws and urge their preservation.
Because so many species use both the pool and the surrounding forest, building around vernal pools poses special threats. Mass Audubon urges: “Even if a vernal pool itself is saved from destruction, changes in the surrounding upland may disrupt the habitat and life cycles of the resident species. The removal of the surrounding forest during the construction of houses, driveways, and lawns, for example, may degrade a nearby vernal pool to such an extent that the amphibian population is eliminated.” http://www.massaudubon.org/learn/nature-wildlife/reptiles-amphibians/vernal-pools/protecting
Most vernal pool creatures try to return to the pool where they were born, so when a pool is destroyed, polluted, or degraded, its creatures are affected, even if they were off in the woods at the time.
Our black bears are mostly sleeping away the winterin their dens, but mama does wake up in January or February for one important event–giving birth.She’ll have 1-4 cubs, though 2 are most common.
The newborns, less than a pound, are blind and hairless.Mama stays sufficiently awake to avoid lying on them and make it easy for them to nurse.Her milk must get them up to 4-6 pounds by spring.Nursing, with no food for herself, she may lose up to 1/3 of her body weight, while non-nursing bears lose only 15-25%. Continue reading Birth Announcement–We Hope→
(Originally printed in Lathrop Lamp Post Jan. 19, 2017)
Walking in our woods in winter, I often see these strange plants that look like miniature evergreen trees. Wondering about their name, I looked in my tree book. Nope. Hmm. My wildflower book. Nope. So I asked north campus resident Helen Armstrong, who knows a heap about native plants, and she said, it’s Lycopodium obscurum, commonly called tree club moss, though my web sources classify it as a fern or “fern ally.”