Showing posts from 2020

Visits to the Castor River

Visits to Branches of the Castor River On 26 June 2020, 10h13, air temperature 24°C, sunny, Beaufort gentle breeze, we set out to check the three branches of the Castor River for Molluscs, and for whatever else.  We'd found a nice variety of Unionid mussels at the Little Castor at Rte 400 last fall, and had a nice variety on the main Castor below Russell in 2000, so the upstream branches were a surprising disappointment – a strange mixture of clay and angular rocks, a long brushy way below their bridges. Beavers were conspicuous by their absence. The main Castor below the Russell weir was totally overwhelmed with the Viviperus Mystery Snails which had first showed up there in 2012, but we didn't find them in any of the upstream branches. Kilometrage for this trip was covered by our Ottawa Field Naturalists Club research grant. Quotes in italics are directly from the database narrative output from which this account is edited down.We were late for an appointment, so our outbound…

Arrival of Juvenile Leopard Frogs

Arrival and abundance of Juvenile Leopard Frogs in Bishops Mills

citation of truncated version: Frederick Schueler. 2019. Arrival and abundance of Juvenile Leopard Frogs in Bishops Mills.CHORUS: Newsletter of the Ottawa Amphibian and Reptile Association 35(7):4-6
There’s a verse in the Leopard Frog song that goes – 
Let us live here in Bishops Mills On the first of every August When the metamorphs from the South Branch marsh Come and fill the fields and the gardens.
- but this year the first juvenile Lithobates pipiens didn’t show up until the 17th of August, which has inspired me to see how variable the date of arrival has been by filtering our database with - RTOD(ACOS(COS(DTOR(LATITUDE-44.87246))*COS(DTOR(LONGITUDE--75.70096)*COS(DTOR(44.87246)))))*111.2<=[x].AND.NAME="Rana pipiens".AND."juv"$LIFE_STAGE.AND.BETWEEN(MO,7,8) – i.e., juvenile Leopard Frogs within [x] kilometres of the central intersection of Bishops Mills during July & August. This was run twice, f…