Friday, July 28, 2017
Thursday, July 20, 2017
Species Profile: Northern Map Turtle (Graptemys geographica)
|Northern Map Turtle - Nancy Barrett|
During a visit in mid-July, I came across a small Northern Map Turtle sunning itself on a sunken log not far from the platform overlooking the pond. I have seen adult Map Turtles sunning themselves, usually on the far side of the pond, so this was a great opportunity to observe and photograph this one. As a young individual, no more than 9-10 cm in length, it was still brightly marked.
This turtle is named for the markings on its shell, which look like contour lines on a topographical map. The head and legs have a pattern of bright yellow lines, with a yellow spot behind the eyes, and the carapace (upper shell) has an obvious raised "keel" or ridge along the centre. Other similar species found in the park include the native Midland Painted Turtle and, unfortunately, the non-native Red-eared Slider which is the most commonly released "pet store" turtle species in Ontario. They act like the neighbourhood bullies to our native species, often released by owners once they begin growing to 33 cm in length with a lifespan up to 30 years.
|Midland Painted Turtle - Nancy Barrett|
Their habitat includes large lakes and rivers with slow-moving water and a soft bottom, and they require high-quality water that supports the females' favoured prey, molluscs (females can grow much larger than males, up to 27 cm compared with 13 cm for the males).
Female Map Turtles may take more than 10 years to reach maturity, nest from June through July, and lay a single clutch of up to 17 eggs. The incubation temperatures of the eggs determines the gender of the hatchlings.
Map Turtles are known for their communal basking, and many individuals can be found piled up together. They have very strong jaws; the females eat snails, clams and crayfish; males and juveniles eat insects and crayfish. Some individuals of this species can live more than 20 years.
Water pollution poses a serious threat as it can cause massive die-offs of molluscs, the primary food item of female Map Turtles. Habitat loss and degradation due to shoreline development are additional threats.
|Red Eared Slider - Nancy Barrett|
The Northern Map Turtle is listed as a species of Special Concern under the Ontario Endangered Species Act 2007 and the Species at Risk Act. It is also considered a Specially Protected Reptile under the Ontario Fish and Wildlife Conservation Act.
Because this species is not very common in our area, and because our reptiles and amphibians are experiencing global declines of 20 and 40 percent respectively, I've always considered it somewhat special. One way to help is to consider becoming a volunteer citizen scientist and submit your sightings, and not just the rare ones. You can do this by downloading the Ontario Reptile and Amphibian Atlas App on your smartphone--it's also a digital pocket guide for all of Ontario's reptiles and amphibians.
Find more information at www.ontarionature.org; source material courtesy Ontario Nature;
Wednesday, July 19, 2017
Tuesday, July 11, 2017
Last week, Humber College's Interpretive Centre launched its new exhibit "Bird's Eye View". Fifty-three people attended the opening evening.
Humber's Office of Sustainability ran their booth during the event, offering up tastes of Humber honey and did a raffle for T-shirts and a jar of honey. Adam Solomon shared some of his original music throughout the event (a real treat!).
Remarks were made beginning at 6:30pm - this included a thank you to their partners and contributors, the premiere of the new 6-minute documentary ("The Whimbrel Watchers") that was made in collaboration with Humber Arboretum.
Attendees heard from Nancy Barrett about her entry into birding and why Colonel Samuel Smith Park is such a special place, and the evening closed with comments from Adrian deRooy and the big "reveal" of his new painting of the shoreline of Colonel Samuel Smith Park (it will be installed on the third floor of the Welcome Centre soon).
The exhibit is open during regular hours in the new Welcome Centre until Saturday, November 25, 2017.
|Adrian deRooy, Wanda and his painting|
Humber's partners on Bird's Eye View include: Nature's Dance Photography, Friends of Sam Smith Park, Humber Arboretum, CCFEW, and Humber's Office of Sustainability.
CHECK IT OUT