Tag Archive | invasive species

Earthworms and Sugar Maple Saplings

Earthworms and Sugar Maple Saplings

Who would have thought that something so small would have such an impact on ecosystems? Lumbricus terrestris – the common earthworm – may not be as friendly as one might think. This species plays a major role in most ecosystems; in gardens and agricultural lands they are typically beneficial, but are they harming the iconic […]

Invasive Earthworms Posing Possible Threat to Yellow Birch Tree Population

Invasive Earthworms Posing Possible Threat to Yellow Birch Tree Population

The decline in tree populations around the world has become an alarming issue, as they play an important role in ecosystems, as well as in the economy. In the Saint Lawrence Lowlands, Yellow birch (Betula alleghaniensis), a uniquely golden yellow barked tree with a wintergreen essence, is an especially interesting species. Commercially, the yellow birch […]

Pileated Woodpeckers and Their Relationship with Beech Bark Disease Infected Trees

Pileated Woodpeckers and Their Relationship with Beech Bark Disease Infected Trees

Introduction Since its introduction to North America in the late 1800’s (McLaughlin and Greifenhagen 2012), beech bark disease (BBD) has become a widespread health problem in forests across eastern North America, including the St. Lawrence Lowlands. It has devastating effects on American beech trees (Fagus grandifolia), drastically changing eastern forest compositions, as well as significantly […]

The Impact of Human Activity on Beech Bark Disease

The Impact of Human Activity on Beech Bark Disease

Organisms Involved in Beech Bark Disease Beech Bark Disease (BBD) is responsible for the affliction of 50% of the North American beech tree population (Garnas, et al., 2011). The North American beech tree, Fagus grandifolia, is a deciduous shade tolerant tree native to its namesake (Zhang et al., 2015). Unique in its genus, this tree […]

Beech Bark Disease Severity vs. Tree diversity

Beech Bark Disease Severity vs. Tree diversity

The American beech tree (Fagus grandifolia) is a species of canopy tree found in the northeastern U.S and Canada, growing in mixed deciduous, hardwood, and temperate forests (Zhang et al., 2015). In the Morgan Arboretum, which is dominated primary by sugar maple and beech, these beech tree plays a significant role in the ecosystem by […]

Earthworm Abundance in Relation to Buckthorn

Earthworm Abundance in Relation to Buckthorn

St. Lawrence lowland forests are home to an immense amount of diversity. However, this diversity can sometimes be put in danger with the introduction of invasive species. Invasive species are attributed to being the second leading cause of local extinction (Roth et al., 2015). One major invasive species in North American forests is the common […]

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). […]