Freshwater Ecosystems
Kelly's Pond
Photo Credits: Winston MaudFreshwater ecosystems, comprising streams, rivers, wetlands, and interconnected environments, host a diverse array of life. These ecosystems encompass a variety of habitats, with wetlands ranging from small roadside marshes to multi-hectare bogs. On Prince Edward Island (PEI), freshwater wetlands and ponds are defined as areas regularly submerged or saturated with water for most or all of the year. It's important to note that 40% of the world's species rely on freshwater wetlands for survival, underscoring the critical need for preservation. Canada stands out as the custodian of the largest proportion of wetlands globally, covering a substantial 25% of these essential ecosystems.
Did you know?
Although readily available freshwater only makes up 1% of Earth's surface, freshwater ecosystems host to a whopping 10% of all species, and 35% of vertebrate species!
Photo: USGS
Wetlands develop in low-lying areas, often near streams and rivers. In Stratford, most of the ponds and their respective marsh areas are small in size, however that does not decrease their impacts. Swamps, fens and bogs have historically been found in abundance on Prince Edward Island however trends show a decrease in recent years. These areas are in need of protection and preservation as new developments put them at risk.
Freshwater ecosystems also hold cultural significance, are popular recreational spaces, and support important fish species. Despite the importance of these habitats, riparian zones and freshwater ecosystems are at an extreme risk of being degraded or lost altogether.
Threats to Freshwater Ecosystems
Impacts of globalization - the growing human population, coupled with the conversion of rural areas to city-like landscapes, has led to the degradation and pollution of freshwater systems. Add in the effects of climate change (ex. increased drought and flood periods), and more complex issues can quickly develop, including threats to food security, economic growth, and human well-being.
Land-use change - urban sprawl has increased freshwater supply through the construction of dams, but has more significantly increased the demand for freshwater, meaning there's simply never enough to go around. The conversion of forests to croplands worsens this issue by changing the underlying surface of the landscape, which can alter groundwater supply, evaporation rates, and increase runoff.
Hydrological alteration - there is a lack of free-flowing (ie. unaltered) freshwater systems Canada-wide. Humans have converted the majority of freshwater sources in some way to better serve our own interests, however we've failed to consider the effects of this within the wider environment.
Microplastics - our reliance on plastic in every aspect of our lives, and the improper recycling of plastic waste, has led to the accumulation of microplastics (ie. tiny plastic particles) in our waterways. This introduces toxic chemicals to water, contaminates ground sediment, and negatively affects aquatic species.
Road salts and sands - although important in keeping our roadways safe, road salts and sands frequently enter freshwater systems via snowmelt and runoff. This salinizes freshwater sources, alters zooplankton abundance, reduces water quality, and hinders the mixing of oxygen and nutrients in the water column, which can have fatal consequences for aquatic species.
Lack of research - despite Canada containing 20% of global freshwater, there continues to be a lack of nation-wide data on key indicators of freshwater ecosystem health. This has contributed to our lack of understanding on the full scale of impacts of human activities in watersheds.
Luckily, PEI is an exception to this; with the help of Atlantic DataStream, we've been collecting data on the health of our sub-watersheds in the Stratford area for several years now.
What's a Riparian Zone?
A riparian zone is the strip of land and vegetation immediately adjacent to a body of freshwater. This unique ecosystem is a hotspot for biodiversity, and connects terrestrial and aquatic environments to each other.
Despite their narrow range, riparian zones have a disproportionately high ecological role, and influence far beyond their immediate area.
Riparian zones play a critical role in:
Water purification
Soil fertility
Pollutant filtering
Climate regulation
Dissipating energy assoc. with flood events
s
Shading stream channels
Nutrient filtering
Nitrogen removal (ie. preventing eutrophication)
Facilitating species migration
If you own land with a buffer zone on it, it's important to keep it in top physical condition to get the most out of your riparian zone!
Interpretive Sign: Freshwater Ecosystems & Riparian Zones
Thank you to Environment and Climate Change Canada for contributing funding and support for this project!
Click HERE to view all of our interpretive signs.
How YOU Can Help Protect These Ecosystems?
If you hold traditional ecological knowledge about a freshwater system, reach out to your local conservation group to help improve the effectiveness of a management plan, while also ensuring that your voice is heard!
Make personal efforts to expand the buffer zone on your property.
Not sure where to start? Contact us and we can point you in the right direction!
Don't own property but still want to do your part? Support your local watershed group in the form of volunteering or donating; this will help them to meet their goals quicker.
Pick up litter in your local area. Not only does this prevent it from reaching sensitive waterways, but it also improves the appearance of the landscape!
References
Department of Environment, Energy and Forestry (1998). PEI Wetland Notes: Freshwater Wetlands. Retrieved from http://www.gov.pe.ca/photos/original/eef_wildlife_p6.pdf
Mendes, A., Albuquerque, A., Almeida, M.H., Arizpe, D., Arvanitis, K., Berjano, M., Camprodon, J., Chatzinikolaou, Y., Crochet, P.A., Cruz, P., Delgado, S., Dias, P.C., Dimopoulos, P., Dincuff, E., Duarte, C.M., Fabião, A., Fabião, A.M., Faivre, B., Faria, C. ... & Zogaris, S. (2010). The importance of Interregional cooperation on river restoration: Ripidurable and Ricover case studies.
Vári, Á., Podschun, S.A., Erös, T., Hein, T., Pataki, B., Iojâ, I., Adamescu, C.M., Gerhardt, A., Gruber, T., Dedić, A., Ćirić, M., Gavrilović, B., & Báldi, A. (2022). Freshwater systems and ecosystem services: Challenges and chances for cross-fertilization of disciplines. AMBIO, 51, 135-151.
World Wildlife Fund. (n.d.). For all of Earth’s inhabitants - Water is life.
Strayer, D.L., & Dudgeon, D. (2010). Freshwater biodiversity conservation: Recent progress and future challenges. The North American Benthological Society, 29, 344-358.
Prince Edward Island. (2016, August). Watercourse, Wetland and Buffer Zone Activity Guidelines. Department of Communities, Land and Environment.
González, E., Felipe-Lucia, M.R., Bourgeois, B., Boz, B., Nilsson, C., Palmer, G., & Sher, A.A. (2017). Integrative conservation of riparian zones. Biological Conservation, 211, 20-29.