Toledo Wildlife

August 6, 2024 • 8:00 am

by Greg Mayer

Once Jerry is well-ensconced in South Africa, I’m sure he’ll have plenty of wildlife photos for us, including some warthogs. In the meantime here’s some wildlife I observed in Toledo, Ohio.

In Late June, I attended the annual meeting of the Society for the Study of Amphibians and Reptiles at the University of Michigan in Ann Arbor, and there was an optional field trip to the Toledo Zoo, which included a visit to a prairie restoration on the banks of the Maumee River near the Zoo grounds.

Matt Cross, Director of Vertebrate Conservation at the Toledo Zoo, directs visiting herpetologists onto the prairie. The “tent” in the background is a device for sampling invertebrates.

Toledo is at the far eastern edge of the “Prairie Peninsula“, where there were only a few scattered stands of prairie at he time of settlement, so this is less a restoration than a creation.The particular patch we went to is on formerly developed land, so many plants were brought in when this patch was established in 2013. This looks like a Black-eyed Susan (Rudbeckia hirta); note the bristly, lanceolate leaves, and 10-13 rays in the flowers pictured.

Rudbeckia hirta, Toledo, Ohio, 27 June 2024.

Although we tend to think of cactus as Southwestern, they occur in Midwestern prairies (and even further east on sandy soils) as well.

Eastern Prickly Pear, Opuntia humifusa, Toledo, Ohio, 27 June 2024.

The Zoo uses cover boards, a commonly used technique, to sample small vertebrates and arthropods.

Cover boards in a small (ca. 2/3 acre) restored prairie in Toledo, Ohio.

And under the cover boards were Northern Brown Snakes (Storeria dekayi).

Storeria dekayi, Toledo, Ohio, 27 June 2024.
Storeria dekayi, Toledo, Ohio, 27 June 2024.

Lots of them! I think the one on the left is a gravid female.

Storeria dekayi, Toledo, Ohio, 27 June 2024.

And, they acted appropriately, engaging in volmerolfaction, sampling the air for chemicals with the tongue, to be sensed by the Jacobson’s organ in the roof of the mouth.

Storeria dekayi, Toledo, Ohio, 27 June 2024

A member of the Zoo staff turned a board in front of me, revealing a nice one. I instinctively grabbed it, quickly handing it to her because I wasn’t sure if handling by us visitors was allowed, but we were, in fact allowed to be herpetologists! Northern Browns are common in Illinois prairies I have visited, and persist in urban and suburban habitats in New York, so it’s not surprising to see them here in Toledo.

There were also invertebrates under the boards,

An ant nest; note the winged individuals. Toledo, Ohio, 27 June 2024

and birds above the boards. A Turkey Vulture (Cathartes aura) soars overhead.

Cathartes aura, Toledo, Ohio, 27 June 2024

A young Bald Eagle (Haliaeetus leucocephalus) perches in a tree on the banks of the Maumee.

Haliaeetus leucocephalus, Toledo, Ohio, 27 June 2024

And a Great Blue Heron (Ardea herodias) was striding around Clark Island, an island being terraformed and enlarged in the Maumee.

Ardea herodias, Toledo, Ohio, 27 June 2024

While walking back to the Zoo proper, we also got to see a Five-lined Skink (Eumeces fasciatus) on a boundary fence at the Zoo.

Eumeces fasciatus, Toledo, Ohio, 27 June 2024.

This was an especial treat for me, because, although I am a lizard specialist, I grew up in the Northeast and have lived for many years in the Midwest, and lizards are not especially diverse or abundant in either region, so it was nice seeing a live, wild lizard!

Live-bearing lizards

October 13, 2011 • 5:44 pm

by Greg Mayer

One of the standard things we learn about animals are their modes of reproduction: budding, egg-laying, live-bearing, etc. And one of the standard things we “know” about modes of reproduction is that mammals are live-bearing, and reptiles lay eggs. Neither of these things we “know” is true, though– they are generalities, with exceptions. The platypus and its cousins the echidnas are fairly well known as egg-laying mammals, but that many lizards and snakes are live-bearers is not well known. Lizards and snakes are actually quite adept at evolving viviparity: over 100 instances of independent (i.e. convergent) evolution of live-bearing are known among lizards and snakes, versus only a single (or perhaps two) instances in mammals.

For many years, our foremost student of reptilian live-bearing has been Daniel Blackburn of Trinity College in Connecticut. In a paper in press in the Journal of Morphology, he and Alexander Flemming of Stellenbosch University report the most mammal-like placenta yet found in a reptile.

Detail from Fig. 8F, showing juxtaposition of fetal (vc) and maternal (uc) capillaries.

In most placental reptiles, exchange of nutrients, gases, and wastes occur through juxtaposition of fetal and maternal tissues, but not by direct contact with maternal capillaries. In the African skink Trachylepis ivensi, they have now found that this does occur, a condition previously thought  to occur only in mammals. Money quote:

Histological study shows that this species has evolved an extraordinary placental pattern long thought to be confined to mammals, in which fetal tissues invade the uterine lining to contact maternal blood vessels.

This species of skink is not very well known. Blackburn and Flemming did their histological studies on a small series of preserved specimens housed in the scientific collections of the Port Elizabeth Museum in South Africa.

h/t Dominic, Matthew Cobb

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Blackburn, D.G. 2006. Squamate reptiles as model organisms for the evolution of viviparity. Herpetological Monographs 20: 131-146. (abstract)

Blackburn, D.G. and A.F. Flemming. 2011. Invasive implantation and intimate placental associations in a placentotrophic african lizard, Trachylepis ivensi (Scincidae). Journal of Morphology in press. (abstract)

Blackburn, D.G., L.J. Vitt and C.A. Beuchat. 1984. Eutherian-like reproductive specializations in a viviparous reptile. Proceedings of the National Academy of Science (USA) 81:4860-4863. (pdf)