LEANING OAKS
  • Home
  • A Species a Day
  • Species Lists
  • Talks

species accounts

333. Dyar's Looper Moth

2/20/2022

0 Comments

 
Picture
Gabriola dyari, or Dyar's Looper Moth, is a moth in the family Geometridae and found from the Alaskan panhandle and British Columbia to California. The caterpillars feed on a variety of conifers, including Mountain Hemlock, Western Red Cedar, Silver Fir, Grand Fir, Subalpine Fir, Engelmann Spruce and most often in our area, Douglas-fir and Western Hemlock. They are a medium -sized moth with a wingspan of 25–30 mm. The forewings are variable from one individual to the next, but usually brownish gray with black speckling and lines. The hindwings are uniformly brownish gray except for a dark thin terminal line, which here is often broken, and appears as a dashed line.  Adults in our area fly in late June throughout July.  Larvae are active from May to July, after overwintering as an egg. Pupation takes place in a cocoon on a twig in August. 

The larvae come in two forms, one is grey with white blotches and is a bird dropping mimic.  The second form is reddish with a tan head and with pale areas and this form mimics male conifer pollen cones.
Picture
Madam Berthe's Mouse Lemur from Kirindy, Madagascar is named for primatologist Berende Rakotosamimanana. It is the smallest primate in the world.
Picture
David Bowie Spider, Heteropoda davidbowie is named for the famous singer. Kabili-Sepilok Forest Reserve, Sabah, Borneo.
Picture
Dyar's Looper Moth is named for moth and mosquito expert, bigamist and recreational tunnel builder, H.G.Dyar Jr.
At the beginning of the pandemic, we ordered a book by Stephen B. Heard called “Charles Darwin’s Barnacle and David Bowie’s Spider- How Scientific Names Celebrate Adventurers, Heroes and Even a Few Scoundrels”. Heard is a great science storyteller and writes interesting tales about eponymously named organisms and the people whose names they bear. We were very excited when we saw David Bowie’s Spider in Sabah, Borneo and discovered we’d seen Madame Berthe’s Mouse Lemur in Kirindy, Madagascar, both species figure prominently in Heard’s book.
 
Gabriola dyari, would be right down Heard’s alley.  The genus name, Gabriola,  is from Gabriola Island, where the species was first discovered. There are five species in the genus, four in Mexico and this one. The species name, dyari,  is named for a prolific and colourful (more on that below) entomologist, Harrison Gray Dyar Jr. (1866-1929). Dyar named hundreds of species and genera of butterflies and moths.

Dyar did graduate work on Lepidoptera classification and later his Ph.D. on airbourne bacteria.  He married in a music teacher and had two children. He started his career as a bacteriologist but after two years took an Honorary Custodian position at the US National Museum; a position with no salary, living off of real estate and other investments.  While at the museum he coauthored a 4-volume treatise on Central American mosquitoes, an important topic during the construction of the Panama Canal, as they had recently been discovered to be vectors of several diseases.  

During this time Dyar came up with “Dyar’s Law” based on his observations of growth in head capsules of larval insects. He identified a geometric pattern of increase in the exoskeleton length and width relationships over progressive molting events that appeared to be completely predictable.   Around 1910 he was recognized for his work on the national collection of Lepidoptera and became salaried expert for the USDA.
Mid-career, Dyar was charged with bigamy having been married to a second person under an assumed name and fathering three sons. His first wife divorced him and he was dismissed from the USDA ”for conduct unbecoming a government employee”.  He later legally remarried and adopted the three boys.   

In 1924 a truck’s back wheels broke through some pavement in Washington D.C.. Upon investigation it was discovered that it had broken through the roof of a tile-lined tunnel. After some speculation in the press, Dyar admitted that he had yet another hobby building tunnels and had developed extensive labyrinths around at least two of the places he had lived. Some were up to 24 feet deep and equipped with electric lighting.
 
For more information on the life of Harrison Gray Dyar Jr. click here and here.

And if Stephen Heard is looking for material for a second volume on ”Adventurers, Heroes and Even a Few Scoundrels” that have lent their names to species, he may want to look at the person behind the name on Gabriola dayri, he appears to fall into all three categories. 
0 Comments

332. Canada Goose

2/14/2022

0 Comments

 
Picture
The Canada Goose (Branta canadensis) on the Saanich Peninsula has an interesting history that is documented in a paper by Neil Dawe and Andy Stewart. Prior to the 1970’s the Canada Goose was mostly a migrant and winter visitor to our part of the island, although small numbers of the “Vancouver” subspecies of Canada Goose nest on the northern part of the island.   There were several small introductions of Canada Geese to the southwest coast of the British Columbia in the late 1920s and early 1930s and then again in the 1970s when larger numbers of Canada Geese were introduced to the lower mainland and S.E. Vancouver Island. These geese came from a variety of places and did not include the subspecies that was breeding on the island.

The earliest documented release of Canada Geese on Vancouver Island was in 1929 when 16 Canada Geese were let loose from a game farm operated by the province at Elk Lake on the Saanich Peninsula.  These introduced birds were augmented by other introductions and reproduced rapidly. By 1958 there were 200 Canada Geese on Elk Lake and were seen moving between Elk and Quamichan Lake in the Cowichan Valley.  

The earliest breeding record I have found for the Victoria area away from Elk-Beaver Lakes was in the notes from the naturalist Tom Briggs that I have entered into eBird.  On May 16, 1960 he wrote, “Met Dave, Ruth [Stirling] and Diedre; they had seen a goose on a nest ....on top of an old snag" ( https://ebird.org/checklist/S27964036) and for the next few days Tom made repeated trips to the Highlands to show others this nest, an exciting find in 1960! 

In the fall and winter our resident birds are augmented by migrant and wintering geese that breed further north.  Many northern hemisphere geese (Canada, Snow, Ross’s, Cackling, Greater White-fronted, Red-breasted, Barnacle, Brant and Pink-footed) are on the increase. It is estimated that there are three times as many geese in North American as there were 30 years ago. (For a review of trends in northern hemisphere geese click here).  The increase in the combination of resident geese and overwintering migrants can be seen below in the graph for Canada Goose for the Christmas Bird Count for the Victoria area.
Picture
Here at Leaning Oaks, we have records of Canada Geese for most of the year, except for the first three weeks of July.  This is the period of the year where our resident Canada Geese moult their flight feathers and cannot fly.  Since there are numerous records from nearby Prospect Lake during this period, and that lake is within earshot, they are clearly quieter during this period as well.
Picture
Picture
0 Comments

331. Pileated Woodpecker

2/3/2022

1 Comment

 

As large as a crow, Dryocopus pileatus is Canada’s largest woodpecker and a year-round resident here at Leaning Oaks.  Few days go by when we don’t see one or more of these spectacular birds at our suet feeder, or hear the high pitched and nasal “cuk, cuk, cuk, cuk, cuk” call of this woodpecker.  Masters of wood processing their presence can be detected by the large feeding holes they create in trunks of trees.  These can be rectangular in shape, particularly when they are searching for ants in Western Red Cedar trunks. In fact, they can be so rectangular I have encountered people that refuse to believe they aren’t human made.  It isn’t the only type of feeding hole they make and here our largest Douglas-fir trees have large irregular holes in the bark in the lower trunks where Pileated Woodpeckers have been searching for the grubs of wood boring beetles.  They also feed heavily on Carpenter Ants and Dampwood Termites .
Pileated, by the way,  means having a crest covering the pileum (top of a birds head from the base of the bill to the nape). 

Picture
1 Comment

    RSS Feed

    Authors

    Two biologists on a beautiful property armed with cameras, smart phones and a marginal knowledge of websites took up the challenge of documenting one species a day on that property.  Join along! Posts and photographs by Leah Ramsay and David Fraser (unless otherwise stated); started January 1, 2014.


    Please let us know of any errors. All photographs are copyrighted; please contact us for use. 


    Categories

    All
    Algae
    Alien Species
    Amphibian
    Annelids
    Arachnids (spiders
    Bird
    Crustacean
    Ferns And Relatives
    Fungi
    Grasses
    Herbaceous Plant
    Insect
    Lichen
    Mammal
    Mollusc
    Moss
    Myriapods (centipedes And Millipedes)
    Reptile
    Sedges
    Shrubs And Vines
    Tree

    Archives

    January 2025
    October 2024
    April 2024
    February 2022
    February 2021
    January 2021
    June 2019
    May 2019
    December 2018
    April 2018
    March 2018
    January 2018
    October 2017
    April 2017
    March 2017
    February 2017
    July 2016
    June 2016
    May 2016
    March 2016
    December 2015
    November 2015
    October 2015
    September 2015
    August 2015
    July 2015
    June 2015
    May 2015
    April 2015
    March 2015
    February 2015
    January 2015
    December 2014
    November 2014
    October 2014
    September 2014
    August 2014
    July 2014
    June 2014
    May 2014
    April 2014
    March 2014
    February 2014
    January 2014

    RSS Feed

Shaw TV's Video Clip about "Species a Day"
Web Hosting by FatCow
  • Home
  • A Species a Day
  • Species Lists
  • Talks