Photo of the Week – A Well-fed Tree Frog

After a large meal on the forest floor, a Pacific tree frog struggles to right itself while climbing back into the forest undergrowth.

Normally heard more often than seen while taking cover in foliage, leaf litter or under fallen logs, these small frogs are now venturing into the open in Humboldt County to take advantage of a seasonal food source. The normally reclusive wood boring beetles are out in large numbers looking for mates, and they make an irresistible meal for a frog.

Wood boring beetles mating on the forest floor in Prairie Creek Redwoods State Park

The Pacific tree frog is capable of eating prey nearly as large as itself, which these wood-boring beetles are. The frog’s body will expand to accommodate larger meals, as pictured above, which will be digested over the course of several days. With their appetite for insects and relatively plentiful numbers in the western states, Pacific tree frogs act as a keystone species in much of their range, stabilizing populations of their prey and providing food for snakes, birds and predatory mammals.

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Photo of the Week – Snowy Egrets Quarreling

As the tide recedes, millions of gallons of water flow out of the mouth of McDaniel Slough, leaving behind expanses of mudflats covered in salty channels and pools. The few conduits of deep water remaining ripple with schools of smelt and draw in several predator species. Snowy Egrets start to arrive in small groups, and soon form a large flock. They’re not after the smelt, though; they stake out territory in the shallower waters, sometimes bickering over the choicest spots.

In addition to their quick reflexes, the Snowy Egrets have a unique hunting technique at their disposal. Patrolling the shallow channels, they shuffle their legs back and forth, jabbing their bright yellow feet into the mud to scare out fish. Any fish that leave the protection of the mud quickly fall prey to the egrets, with their escape routes limited by the low tide.

Out of the many fish and marine invertebrates that inhabit Humboldt Bay’s tidal wetlands, this flock of egrets overwhelmingly prefers the three-spined stickleback. Each bird can gobble up as many as five of these small fish per minute.

A Snowy Egret holds a freshly-caught stickleback in its beak

As many as two dozen Snowy Egrets will show up to fish on the calm waters of the McDaniel Slough tidal wetlands, usually staying in groups so that they can nab fish stirred up by their neighbors as well as the ones they have rooted out themselves. Their fish-scaring dances, lighting-fast strikes, occasional squabbles and bright white feathers reflecting off the surface can make for quite a spectacle.

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Photo of the Week – Gems of the Forest Floor

With two rain storms come and gone on California’s northern coast, several plants, fungi and animals that stay dormant or hidden during the warmer months are blooming or crawling forth from the ground. Here, a snow plant emerges from its bed of moss and humus.

These are one of the few plants that don’t don’t derive their nutrition from photosynthesis. In a healthy forest, many trees have a symbiotic relationship with fungi that attach to their root systems; the tree provides sugars to the fungus, while the fungus provides mineral nutrients and water to the tree. The snow plant attaches to these fungi and draws sugars from it.

With leaf litter starting to build up on the forest floors, young yellow-spotted millipedes are appearing in large numbers. When immature, these flat-backed millipedes will feed on humus, freeing up nutrients for other organisms in the forest ecosystem as fallen leaves are digested. While they grow, they will develop rows of bright yellow spots along their sides as a warning to potential predators about the millipedes’ ability to emit hydrogen cyanide as a defense mechanism.

An immature yellow-spotted millipede making its way through the forest

Pictured behind the millipede in the above image are white coral fungi, which sprout during the fall to become a common but enchanting element of the ground cover in coastal spruce and redwood forests during the colder months. Less commonly seen are orange and yellow-tipped coral fungi.

A yellow-tipped coral fungus below a redwood tree

The rains have also brought forth a savory treat. Golden chanterelles are prized for their complex flavor by chefs around the world, and will grow in several types of forest. Here, they are a common occupant of spruce groves with deep leaf litter and a nearby water source.

A cluster of golden chanterelles growing under a fallen log

With plentiful food available in the coastal forests, the Pacific sideband snail is most active during the fall. It will feed on fungi and plant matter, mostly during the morning and evening hours, before hibernating in the winter.

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Photo of the Week – Rutting Bull Elk

As fall approaches, the Roosevelt elk enter the rut, the mating period for their species during which many of their distinctive behaviors emerge. After spending several months developing velvet-covered antlers, the bulls strip away the velvet and sharpen the tips of these bony structures by rubbing them against trees, shrubs and grasses. Here, bearing an impressive set of seven-point antlers, a bachelor bull looks up to survey its surroundings before returning to grazing in a field near Dry Lagoon.

Rutting bulls will compete to attract a harem by bugling and spraying themselves with urine to create a scent that appeals to cows. Bulls may challenge each other for control over a harem by bellowing at each other and walking in parallel to size up each other’s physical prowess. If neither decides to back down at this point, conflicts escalate to antler wrestling, in which bulls can sustain serious injury. Here, the bull featured in our photo from earlier this year shows signs of having lost his harem to a challenger, but is still attempting to attract cows and drive away rivals:

Bulls rarely eat while in control of a harem, and can lost up to twenty percent of their body mass during breeding season. This bull’s weight loss likely made him vulnerable to a challenge from a rival bull, in which he appears to have sustained an eye injury during antler wrestling. Not content to remain a bachelor, he continues to bugle and make his presence known to potential mates and rivals.

Elk cows are only fertile for approximately two days out of the year, so a bull with a harem must keep close track of which cows are in estrus if he is to mate successfully. To do this, the bull smells and tastes his cows frequently.

Young bulls not mature enough to mate will frequently live on the periphery of harems during the rut, grazing alongside the cows and occasionally honing their skills for future years.

Two young bulls practice antler wrestling

Meanwhile, the calves the joined the herd in June stay close to their mothers and continue to suckle and grow.

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News Roundup – Rivers, The State of Birds and More

In a comprehensive follow-up to a 2009 compilation, a new State of the Birds Report has been released (available in full as a PDF or summarized in their news release here). In a collaboration between 23 government agencies and conservation organizations, this extensive analysis of long-term monitoring data is the bearer of both good and bad news for U.S. birds. Restoration and preservation of wetland habitats has reversed declines in waterfowl populations while habitat loss and fragmentation in arid regions has lead to steep declines in bird populations of the Southwest and deserts of the western United States. Analyzing trends in seven key habitat categories, the report identifies 240 species that are either endangered or are likely to become endangered if current trends continue.

Meanwhile, the Audubon Society has released its own report about the shifting landscape bird populations are facing due to climate change. Data can be explored on an interactive map by species or by region, showing which birds will face habitat loss due to global warming over the next 65 years. While some species will face little to no challenge, others are expected to face nearly complete loss of their summer or winter habitats. The Eared Grebe, which is now the most abundant grebe species in the world, is projected to lose the entirety of its current summer range. The Golden Gate Audubon Society, using data from this report, offers a look at what’s in store for Bay Area birds. Further up the west coast, the Audubon Society of Portland is doing work to preserve the habitat of the endangered Marbled Murrelet.

An Eared Grebe in Lake Merritt

For those interested in making the country a more habitable place for birds, The Audubon Society has put together a list of things you can to help birds and Cornell Bird Labs offers a guide to planting bird-friendly berries in your yard.

With the tail end of a rain storm currently passing over California’s northern coast and another expected to arrive on Wednesday, good news has arrived for the region’s ecology, fisheries and agriculture. However, the exceptionally dry water year and complete depletion of snowpack in the state have taken a toll. Extremely low flows and warmer water in the Klamath River have contributed to the outbreak of a parasitic infection capable of killing adult salmon before they spawn. Nearly half the Chinook salmon caught in recent fishing expeditions were infected with the ich parasite. To combat the spread of the disease, the Bureau of Reclamation has begun to release water into the Trinity River, a tributary of the Klamath.

During dry years, many of California’s farms rely on pumping ground water to irrigate their crops. During this extended drought, some regions of San Joaquin Valley have extracted groundwater to the point that the ground level has sunk significantly. With a commonly used resource in danger of running out in some regions, California has joined the rest of the western states in adopting rules for extracting groundwater.

In response to pressure from groups associated with the urban farming movement, the city of Oakland is changing its zoning regulations to facilitate growing, harvesting and selling food within the city. Making use of blighted properties and normally unproductive residential yard space, urban farmers aim to produce food with a significantly smaller carbon footprint than large-scale commercial agricultural operations while avoiding wasteful and ecologically damaging irrigation, fertilizing and pesticide application practices that are widespread in the industry.

The Chaparral Institute, working with The John Muir Project and the Center for Biological Diversity, has announced a lawsuit against the Stanislaus National Forest to prevent the logging of recently burnt trees. Citing primarily ecological concerns, they’ve offered a six-point explanation of why the planned “salvage logging” should be stopped.

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