Fall 2016

Woodpecker Damage on Ash Trees at the Morgan Arboretum

Woodpecker Damage on Ash Trees at the Morgan Arboretum

Introduction The emerald ash borer (EAB) has killed 75 million ash trees in North America since 2002 (“Ville de Montreal”, 2015), causing Montreal to invest 15 million dollars over the next three years to deal with the infestation, and plant new trees (Laframboise, 2016). Predators of the EAB larvae include woodpeckers (Jennings et al., 2013). […]

Solving a Myth: Do Lichens Know What Direction They’re Growing In?

Solving a Myth: Do Lichens Know What Direction They’re Growing In?

Introduction Growing up in Canada, our culture has always praised the pioneers who colonized what we call home. Lichens, in the way the first settlers tell us about a community, tell us a lot about an ecosystem. They are bioindicators for air quality and perhaps even cardinal direction. Join us in our investigation as we […]

Buckthorn Abundance Along Edge Habitats: Morgan Arboretum

Buckthorn Abundance Along Edge Habitats: Morgan Arboretum

  Figure 1: One of the tree lines we studied, on a beautiful day. Introduction: The invasive European shrub known as Buckthorn, has been recently identified as detrimental to North American ecosystems (Mascoro, 2007). There are two types, Common buckthorn (Rhamnus cathartica) and Glossy buckthorn (Fragula alnus) (See figure 2). In the context of our […]

Feeding Habits of The Eastern Grey Squirrel in Urban and Forest Habitats

Feeding Habits of The Eastern Grey Squirrel in Urban and Forest Habitats

Squirrels are one of the most recognizable animals in Canada. According to The Natural History of Squirrels (Gurnell 1987), three different types of squirrels exist: flying, ground-dwelling and tree squirrels. They all evolved from a common ancestor living in North America during the Eocene epoch (54 to 57 Million years ago), and then spread out, […]

Medicinal Plants in the Morgan Arboretum

Medicinal Plants in the Morgan Arboretum

Dominant tree species within a forest have resounding effects on the developmental direction an ecosystem takes. Different types of trees can affect the soil properties, water, light availability, and in our case, understory growth. A large portion of understory plants have medicinal properties, making them of special interest to humans both historically, having been used […]

Saproxylic Invertebrate Diversity in Decaying Ash Trees Vs. The Stage of Decay

Saproxylic Invertebrate Diversity in Decaying Ash Trees Vs. The Stage of Decay

Trees decay at very slow rates over the space of decades and constitute as much as 10-25% of the above ground biomass in forests (Ulyshen, 2014). Dead wood is a significant factor in nutrient cycling and is a host to many organisms, from unicellular microorganisms to complex invertebrates (Franklin et al., 1997). Organisms that depend […]

Intraspecific Competition within the Sugar Maple Species, Acer Saccharum, through the Assessment of Population Density and Size

Intraspecific Competition within the Sugar Maple Species, Acer Saccharum, through the Assessment of Population Density and Size

There are approximately 150 species of maple trees located within the Northern Hemisphere, with 10 of them native to North America (NRCAN-2015). One of the most commonly grown species of maple is the Sugar Maple (Acer saccharum). Sugar maple is a keystone species, meaning it is a significant ecological element of Northern hardwood forests, like […]