Jack Greene, Author at Wild About Utah

December 22, 2015November 29, 2023

Christmas Bird Count (CBC) and Climate Change

Click for a larger view of Frank M. Chapman, organizer of the first christmas bird count, Courtesy Wikimedia, Image in the public domain — Frank M. Chapman
Courtesy Wikimedia
Image in the public domain

On December 19th, I will have joined several others for an exciting day of counting bird species and numbers in our lovely, snowy valley. Our numbers will be entered on a database that will be shared with the world. The Christmas Bird Count began on Christmas Day in the year 1900 when ornithologist Frank M. Chapman, an officer in the nascent Audubon Society, proposed a new holiday tradition—a “Christmas Bird Census” that would count birds during the holidays rather than slaughtering them, which had been the past ritual.

The data collected by observers over the past 115 years has allowed researchers to study the long-term health and status of bird populations across North America. When combined with other surveys such as the Breeding Bird Survey, it provides a picture of how the continent’s bird populations have changed in time and space. This long term perspective is vital for conservationists. It informs strategies to protect birds and their habitat, and helps identify environmental issues with implications for people as well.

Along with the fun it brings, this year’s count will have special significance for our local Audubon chapter which was awarded a National Audubon grant for “spreading the word” on our changing climate’s impact on birds. Through the grant writing and implementation I have a heightened awareness of how bird populations and their spacial distribution are changing at an accelerating rate.

Audubon’s 2014 Climate Change Report is a comprehensive, first-of-its kind study that predicts how climate change could affect the ranges of 588 North American birds. Of the bird species studied, more than half are likely to be in trouble. The models indicate that 314 species will lose more than 50 percent of their current climatic range by 2080.

The Environmental Protection Agency (EPA) has included Audubon’s climate change work from CBC data as one of 26 indicators of climate change in their 2012 report.

In 2007, CBC data were instrumental in the development of Audubon’s Common Birds in Decline Report, which revealed that some of America’s most beloved and familiar birds have taken a nosedive over the past forty years.

142 species of concern are found in Utah including our state bird, the California gull and our the bald eagle, our national bird. Averaging the most recent 10 years, our valley has seen 16 species increase and 11 species decline. Of course we would need a take a much broader sweep to know the true story of these species, but our data may play a significant part in the overall analysis.
And please keep those bird feeders full as we enter the coldest month of the year!

This is Jack Greene for Wild About Utah.

Credits:
Image: Courtesy Wikimedia and in the public domain
Text: Jack Greene, Bridgerland Audubon Society

Additional Reading:

November 9, 2015August 23, 2023

Seasonal Changes and Amazing Adaptations

Biking daily from Smithfield Canyon to USU campus, combined with an early am run, I’m well aware of the drop in temperatures, as are those of us who find themselves outdoors on a more permanent schedule. I’m speaking of our relatives who reside in the wild- birds, trees, raccoons, and such.

While I put on an extra layer or two, plants and animals have far more sophisticated adaptations from behavioral to physiological to structural.

We are all aware of the marvelous migration and hibernation behaviors, so let’s add a few more amazing adaptations to the list.

I’ll begin with a bird that is very common at our winter feeder- the Dark-eyed Junco. which responds to the first shortening days of summer with a series of physical changes: its reproductive organs become inactive and shrink in size, hormones stimulate the rapid growth of a new set of feathers, and fat deposits develop to provide fuel for the long migratory flight ahead.

Thus the preparation for migration starts as soon as the days begin to shorten. And the process must operate in reverse when the bird is in its winter habitat in the United States. As soon as days begin to lengthen, the Dark-eyed Junco must gear up physically for the flight north and breeding season. If it fails to do so, it likely won’t survive a long-distance migration. So the cycle of life and its related migrations and transitions are deeply connected to the heavens.

Plants are no less amazing. Those in temperate zones must also set their calendars accurately in order to flower and, for deciduous species, develop and drop leaves at the optimal time. Plants set their internal calendars using several attributes from the sunlight they receive. In fact, the angle of the sun may be more important to a plant than day length.

That’s because plant cells produce compounds called phytochromes in response to different portions of the light spectrum. Direct sunlight is higher in red light, while indirect sunlight contains more far-red light. During late fall and early winter, when the sun remains low in the southern sky, the indirect light produces an increase in far-red phytochromes.

As spring approaches and the arc of the sun rises in the sky, direct sunlight triggers the production of red phytochromes. The ratio of these two compounds mediates the hormones involved in flowering, leaf drop, and bud development. Even seeds below the soil are affected. The amount of red and far-red light that penetrate the soil is sufficient to govern germination.

Some behavioral alterations worth mention beyond migrating and hibernation are herding and flocking, huddling to share body warmth, dietary change, hair & feather change- both color and structure, and many more but my radio time is ending, so now it’s your turn to explore more! It really does make you appreciated the wonders of nature.

This is Jack Greene for Wild About Utah.

Credits:
Image: Courtesy and copyright 2008 Ryan P. O’Donnell
Text: Jack Greene, Bridgerland Audubon Society

Additional Reading:

Dark-eyed Junco, Junco hyemalis, Aynsley Carroll, Animal Diversity Web, https://animaldiversity.org/accounts/Junco_hyemalis/

Dark-eyed Junco, Junco hyemalis, Aynsley Carroll, Boreal Songbird Initiative, https://www.borealbirds.org/bird/dark-eyed-junco

https://scholar.google.com/scholar?q=junco+winter+reproductive+cycles

Jigang Lia, Gang Lib, Haiyang Wangb, and Xing Wang Denga, Phytochrome Signaling Mechanisms, The Arabidopsis Book, American Society of Plant Biologists, 2011, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3268501/ pdf

October 5, 2015April 8, 2021

Swainson’s Hawks

Swainson's Hawk, (Buteo swainsoni), Photo Courtesy US FWS — Swainson’s Hawk, (Buteo swainsoni)
Photo Courtesy US FWS

Swainson’s Hawk, (Buteo swainsoni)
Photo Courtesy US FWS

The Wellsville Mountains of N. Utah are known for their steepness, spectacular beauty, and an extraordinary fall raptor migration. The perfect mix of thermal uplift on its west slopes funnels the birds along the east side of the Great Salt Lake to their southerly destinations. Many species- eagles, falcons, accipiter’s, and buteos grace its slopes. The migration occurs primarily from mid-August to mid-October. Last Saturday’s hawk watchers were treated to 300 plus birds consisting of 15 species.

There is one in particular that is known for its extraordinary abilities and unusual behaviors that I will dwell on, that being the Swainson’s hawk. Nearly the entire population of these amazing birds will navigate their way to Argentina, a distance not equaled by any other raptor.

This species was named after William Swainson, a British naturalist. It is also known as the grasshopper hawk or locust hawk, as it is very fond of locusts and grasshoppers and will voraciously eat these insects whenever they are available. They have the unusual behavior of congregating in large numbers in fields to attack their prey. I’ve counted over 100 birds occupying cut hay fields in a half mile distance.

Breeding Swainson’s hawks are opportunistic feeders that respond quickly to local concentrations of food and rely heavily upon small mammal, bird, and reptiles such as young ground squirrels, rabbits, pocket gophers, mice, small birds. Birds taken include Mallards, young Sage Grouse, American kestrel, and young short-eared owls. Reptiles include snakes such as racers, gophers, striped whipsnakes, and lizards. Amphibians include tiger salamanders and toads.

In Argentina, Swainson’s hawks feed on flocks of the migratory darner dragonfly, following the hordes of insects and feeding mostly on the wing. Local outbreaks of locusts may also be exploited. There is also some evidence that road-killed birds and animals are consumed both on the wintering grounds and on the breeding grounds. They commonly follow tractors during haying or ploughing, where rodents are exposed for the hawks to capture, or insects are uncovered after crop cutting.

Wildfires often attract foraging hawks, especially grass fires in their South American wintering range where they frequently wait around the edges of the fire, picking off insects and vertebrates including grouse, lizards, and snakes.

This weekend I will be on my way to our raptor observation peak high in the Wellsvilles hoping to see this amazing bird, along with a host of other raptors as they migrate to more favorable climes, but only one of the myriad species will make it all the way to Argentina!

This is Jack Greene reading for Wild About Utah.

Credits:

Pictures: Courtesy US FWS, San Andres NWR
Text: Jack Greene, Bridgerland Audubon Society

Additional Reading:

Animal Fact Sheet: Ringtail, Arizona-Sonora Desert Museum, https://www.desertmuseum.org/kids/oz/long-fact-sheets/Ringtail.php

Ringtail (Bassariscus astutus), Wildscreen Arkive, https://www.arkive.org/ringtail/bassariscus-astutus/

August 31, 2015April 8, 2021

Ringtails

Ringtail (Bassariscus astutus), Photo Courtesy US FWS — Ringtail (Bassariscus astutus)
Photo Courtesy US FWS
San Andres NWR

I’ve long been intrigued by ringtail cats. I wasn’t quite sure where they fit in the grand scheme of things until I did some research while working in Zion N.P. where they were known to vandalize building contents and other mischievous behaviors.
These “mystery” cats are mostly nocturnal, highly secretive, very bright, and full of tricks and athletic feats that place them in an elite animal category. I was intent on seeing one but knew my chances were slight. On a midmorning hike into Hidden Canyon I was startled by something not far ahead of me scrambling up giant boulders. To my amazement, there they were- two ringtails hightailing in broad daylight- my first, and possibly last, sighting of these amazing animals!
The name “ringtail” comes from the seven or eight black rings on the animal’s tail. Although they are not related to cats, people have referred to them as miner’s cat, civet cat, and cacomistle (an Aztec Nahuatl term meaning half mountain lion). Along with raccoons and coatimundis, ringtails are members of the Procyonidae (raccoon) family. The scientific name, Bassariscus astusus, comes from bassar (fox), isc (little), and astut (cunning).

If one were to design an animal to climb along ledges and up vertical cliffs, the ringtail might be it. Their large tail provides balance for narrow ledges and limbs, even allowing them to reverse directions by doing a cartwheel. They can rotate their hind feet 180 degrees to quickly climb back down cliffs or trees as well as cacti. Furthermore, ringtails can ascend narrow passages by stemming (pressing all feet on one wall and their back against the other or pressing both right feet on one wall and both left feet on the other), and wider cracks or openings by ricocheting between the walls.

A ringtail’s total length ranges between inches with a tail length of 12 to 17 inches. They weigh two pounds or so. Vocalizations include squeaks, metallic chirps, whimpers, chitters, chucking, hisses, grunts, growls, and howls.
Like most omnivores, these hunters eat a wide variety of food. They have a seasonal diet, with plants and insects the favorite fall food, mammals and birds more common in winter, and insects dominate in summer. Preferred mammals include mice, woodrats, squirrels and rabbits. Ringtails also feed on nectar from agaves. Great horned owls are their major predator, along with coyotes, raccoons and bobcats.

Primarily nocturnal, ringtails don’t like daylight at a young age. Ringtails inhabit rough, rocky habitat, usually not too far from water, although they can subsist without free water if their diet consists of high protein prey or fruit and insects. In addition, they occur in semi-arid landscapes such as pinyon-juniper pygmy forests and oak woodlands. Ringtails den in tree hollows, rock crevices, other animals’ abandoned burrows or even abandoned buildings. Except in bad weather, they move frequently, rarely spending more than three straight nights in one den.

Mating occurs between February and May with one to four, hairless young born in May or June. Eyes open and fur covers their bodies by five to six weeks. They are weaned by fall and can mate near the end of their second year. Ringtails range across the southwestern USA and most of Mexico with outliers in northern California, Nebraska, Missouri and extreme southwest Wyoming.The genus Bassariscus consists of only one other species which lives in Central America. Because ringtails do not walk on the soles of their feet, unlike coatis or raccoons, they are sometimes placed in their own family, Bassariscidae. The ringtail became the State Mammal 1986.

For Wild About Utah, this is Jack Greene.

Credits:

Pictures: Courtesy US FWS, San Andres NWR
Text: Jack Greene, Bridgerland Audubon Society

Additional Reading:

Animal Fact Sheet: Ringtail, Arizona-Sonora Desert Museum, https://www.desertmuseum.org/kids/oz/long-fact-sheets/Ringtail.php

Ringtail (Bassariscus astutus), Wildscreen Arkive, https://www.arkive.org/ringtail/bassariscus-astutus/