Fathom Five National Marine Park
IUCN category VI (protected area with sustainable use of natural resources)[1]
Flowerpot Island
Location ofFathom Five National Marine Park inCanada Show map of Canada Location ofFathom Five National Marine Park inSouthern Ontario Show map of Southern Ontario
Location	Georgian Bay,Ontario,Canada
Nearest city	Tobermory, Ontario
Coordinates	45°19′17″N81°37′34″W / 45.32139°N 81.62611°W /45.32139; -81.62611
Area	112 km2 (43 sq mi)
Established	20 July 1987[2]
Visitors	227,828 (in 2022–23[3])
Governing body	Parks Canada

Fathom Five National Marine Park is aNational Marine Conservation Area in theGeorgian Bay part ofLake Huron,Ontario,Canada, that seeks to protect and displayshipwrecks andlighthouses, and conservefreshwater ecosystems.Parks Canada has management plans for the aquatic and terrestrial ecosystems, with a multi-action plan for species that are at risk, includingendemic species, theMonarch butterfly, theeastern ribbonsnake, and theeastern whip-poor-will. The aquatic ecosystems in the park are also of particular interest. Manyfish,shellfish,amphibians, andeels are an attraction fornaturalists in the park. Much of this wildlife is accessible to scuba divers andsnorkellers in the park. The many shipwrecks make the park a popularscuba diving destination, andglass bottom boat tours leaveTobermory regularly, allowing tourists to see the shipwrecks without having to get wet.^[4] Additionally, there are three main popularhiking trails found within Fathom Five National Marine Park that provides visitors with views ofold growth forests and theGeorgian Bay. TheSaugeen Ojibway Peoples have inhabited theBruce Peninsula and the area that is now Fathom Five National Marine Park for thousands of years. This land provided for their communities and their people with the plethora of wildlife and plant life. They provide the local knowledge about Lake Huron and its ecological value to the reserve, park, and their overall livelihood. Parks Canada and Saugeen Ojibway People's collaboration is said to yield a benefit to both parties with regard to overall ecosystem knowledge.

Many visitorscamp at nearbyBruce Peninsula National Park and use the park as a base to explore Fathom Five and the surrounding area during the day.

Fathom Five also contains numerous islands, notablyFlowerpot Island, which has rough camping facilities, marked trails, and its namesakeflowerpots, outlyingstacks ofescarpment cliff that stand a short distance from the island, most with vegetation (including trees) still growing on them.

The park was established on 20 July 1987 using the area of the Fathom Five Provincial Park and the western portion of theGeorgian Bay Islands National Park.^[5] The park represented a pioneering departure for the national park system, which had centred on land-based conservation until then. Its designation as aNational Marine Park foresaw the creation of others, though nomenclature for such units would morph intoNational Marine Conservation Areas, leaving Fathom Five as the only National Marine Park. Despite its unique name, it is categorized as an NMCA and is deemed the first one in the country.

In 2006, a new visitors' centre opened to serve Fathom Five National Marine Park and theBruce Peninsula National Park. Designed by Andrew Frontini ofShore Tilbe Irwin + Partners, theCAD $7.82 million centre, approached by a boardwalk, features an information centre, reception area, exhibit hall and theatre. A 20-metre viewing tower was also constructed to provide visitors with aerial views of the surrounding park andGeorgian Bay. The centre was designed withenvironmental sustainability in mind, receiving $224,000 from the Federal House in Order initiative for implementation of innovative greenhouse gas reduction technology.^[6]

With an annual visitation number of 490,388 from 2019-2021,^[7] Fathom Five National Marine Park is a popular destination among locals and tourists. The park has three main trails, which range in duration from five minutes to two hours. The Bruce Trail to Little Dunks Bay is approximately two kilometres long and provides visitors with a panoramic view of Little Dunks Bay and Georgian Bay.^[8] The Bruce Trail Burnt Point Loop has the longest hike of the three, encompassing 4.8 km, which passes through cedar forests and provides a view of Georgian Bay. Visitors can embark on the shortest hike that is less than half a kilometre in length, passing by the visitor centre on their way to Tobermory Harbour.^[8]

The management plans for the Fathom Five National Park was made in 1998. The park was created to protect the longevity of the Georgian Bay marinebiodiversity and environment. The aquatic ecosystems management was created to study the structure of theecosystem and resources, protect species andhabitats, and identify the impact ofnonnative species and make management plans to take action if they negatively impactnative species. The fish management plan was created to monitor thepopulations, and allow sustainable harvest throughcommercial andsport fishing. The terrestrial ecosystems management plan was created to monitor the islands’biogeography and to and reduce human impact on the environment. This is done by preventing new species from being introduced and limiting public access to areas. Additionally, management requiresenvironmental impact assessments to be done prior to any activities or development.^[9]

The management progress was last reported by Parks Canada in 2010. The goals to conserve and monitor aquatic ecosystems is approximately 50% complete. The coastal ecosystems'water quality, water level, fish populations, and connectivity are in good condition. The island ecosystems' habitat and connectivity is in fair condition, and they are still developing the offshore and social indicators. The goals to preserve the terrestrial ecosystems are being met, and is in fair condition. The goal of having environmental impact assessments is also being followed prior to activities.^[10]

A multi-species action plan to conservethreatened andendangered species was created by Parks Canada to be implemented in Fathom Five National Park and Bruce Peninsula National Park. The plan includesCOSEWIC’s (Committee on the Status of Endangered Wildlife in Canada) identification of the species threat status, and plans to recover the population size and distribution of the species.^[11]

There are endemic species included in the plan, such asDwarf Lake Iris (Iris lacurstris) andLakeside Daisy (Tetraneuris herbacea).^[11] The Dwarf Lake Iris's status is of special concern, as it is only found in theGreat Lakes basin, with one of its locations being Lake Huron.^[12] It is aperennial plant with blue or purplepetals which blooms between mid-May and early June.^[12] The Lakeside Daisy status is also of special concern, as it is likewise only found near the Great Lakes.^[13] It is a perennial herb with yellow ray petals and blooms between May and early June.^[13]

Themonarch butterfly (Danaus plexippus) is a species of butterfly that is currently listed as a species of special concern in the province of Ontario.^[14] This migratory butterfly is found in Fathom Five Marine Park, as well as other parts of Southeast Canada and the Northeast United States during itsbreeding season in the summer.^[15] Upon breeding, the monarch butterflies embark on amass migration of approximately 4,500 kilometres to their final resting place in CentralMexico.^[15] As a species of special concern, the monarch butterfly is neither threatened nor endangered.^[15] As a result ofhabitat loss and the use ofpesticides andherbicides, the monarch butterfly's natural habitat has been dramatically impacted.^[15] The monarch butterfly is a globally threatened species, and its numbers have declined dramatically throughout the past few decades, from 10 million butterflies in 1980 to 1914 butterflies in 2021.^[16]

Themassassauga rattle snake (Sistrurus catenatus) is a species ofsnake listed as endangered under the Species at Risk Act (SARA).^[17] This snake has a long, grayish-brown body with semi round spots throughout its body, and it ranges in size from 50–70 cm long.^[17] The species is found in the Fathom Five Marine Park, in habitats such as tall grass,bogs,marshes, shorelines, and forests. In addition to habitat loss caused by human expansion, these snakes are also at risk of being killed bymotor vehicles or ill-intentioned humans.^[17] There are approximately 10,000 adult massasauga rattle snakes found throughout Eastern Ontario andQuebec; however, a substantial portion of this population can be found within the Fathom Five Marine Park and the Bruce Peninsula.^[18] Both the Massasauga - Great Lakes / St. Lawrence population and the Massasauga - Carolinian population are experiencing steady declines in population numbers.^[18]

Theeastern ribbon snake (Thamnophis saurita) is a species of snake that is listed as a "special concern" that is likely to become endangered if proper precautions are not taken.^[19] On its sides and back, the snake has three yellow stripes that easily distinguish it from other snakes.^[19] The Fathom Five Marine Park is home to this species of snake, which is normally found in environments near water.^[19] The snake is threatened by habitat loss as a result of human development.^[19] In addition, the eastern ribbon snake relies heavily on the ability to hunt amphibians and is experiencing a decline in food availability due to habitat loss and degradation.^[19] Currently, there are an estimated 1,000-3,000 adult eastern ribbon snakes inhabiting Ontario, and their numbers are steadily declining.^[20]

Theeastern whip-poor-will (Caprimulgus vociferus) is currently listed as threatened under the Species at Risk Act (SARA), and if proper measures are not taken it may become endangered.^[21] Easter whip-poor-wills can be found in the Fathom Five Marine Park.^[21] They are distinguished by their medium size and brown and greyfeathers that provide them with excellentcamouflage so that they can blend in with the surroundings.^[21] The eastern whip-poor-will is generally found in open woodlands with mixedconifers anddeciduous trees.^[21] Threats to the eastern whip-poor-will are directly caused by the loss and degradation of their habitat.^[21] From 1968-2007, the number of eastern whip-poor-wills has decreased by nearly 75% of its original population in Canada, and its population is gradually decreasing at a rate of 3.2% per year.^[22]

There is a very real threat associated withclimate change on a global scale, but especially within Canada. According to current projections, the province of Ontario will experience an increase in average temperatures of 2.6-2.7 degrees Celsius by 2030 and 5.9-7.4 degrees Celsius by 2080.^[23] A further consequence of climate change will be an increase inprecipitation by 4.5%-7.1% in Ontario and a possible increase of 3.2%-17.5% by 2080.^[23] It is anticipated that climate change could have dramatic effects on species such as the monarch butterfly, the massassauga rattlesnake, the eastern ribbon snake, and the eastern whip-poor-will, which are already on the endangered list. Increasing temperatures and precipitation will lead to more frequentflooding,droughts, andextreme weather events. Due to these impacts, there will be a drastic decrease in viable food sources for monarch butterflies, such asmilkweed.^[15] It is anticipated that the flooding will negatively impact the landscapes in which massassauga rattlesnakes, eastern ribbon snakes, and eastern whip-poor-wills rely heavily on for shelter, food, and protection.^[16][18]

Lake Huron is home to 139 native fish species, many of which are found in Fathom Five Provincial park. Some examples includesculpins,gizzard shad,shiners, andciscoes. These fish sustain populations of largerpredatory species such aspike,muskellunge,large andsmallmouth bass,brook trout, andwalleye. These native species are dispersed throughout the great lakes watershed.

Lake Huron is also home to eight nativeturtle species, including thespotted turtle (Clemmys guttata),Blanding’s turtle (Emydoidea blandingii),spiny softshell turtle (Apalone spinifera),northern map turtle (Graptemys geographica),eastern musk turtle (Sternotherus odoratus),snapping turtle (Chelydra serpentina), midland painted turtle (Chrysemys picta marginata), andwood turtle (Glyptemys insculpta). Out of these species, two are listed as endangered, two are listed "threatened", and three species are of special concern.^[24] The reduction of coastal wetlands has greatly impacted turtles in Lake Huron, including the Bruce Peninsula. Fathom Five National park is home to several wetlands. These wetlands are critical habitat to sensitive species such as turtles,black terns,king rails,herons, Black crest night herons and other species of special concern.

Lake Huron is home to several introduced and invasive species.Pacific salmon were introduced to Lake Huron; specifically,Chinook,coho andpink salmon were intentionally introduced by sport fishermen. Additionally, invasive species introduced viaballast water, man-madecanals,aquaculture, and thepet trade have established large populations within the lakes.Lampreys,alewives, andquagga mussels are the most common examples of invasive species in the Great Lakes.^[25]

Invasive species have affected the lake ecosystem considerably. Quagga mussels arefilter feeders, and filter water through theirsiphons in order to trapalgae andplankton. These mussels are so prevalent that their filtration has drastically changed the clarity of the water, allowing algae to grow on rock structures on the lake bed where it would not previously be present. Predatory fish have also been affected greatly by invasive species. The clarity of the water, created by quagga mussels,^[26] causesambush predators to be less successful in ambushing prey.Keystone native species such aslake trout, muskellunge, and pike have been greatly affected by this change. Large fish species have also been affected by the sea lamprey.

Lampreys are aparasitic predator, and attach themselves to large fish and feed on theblood of their prey. Lampreys are native to the Great Lakes;Silver,chestnut,American brook, andnorthern brook lamprey are native to streams and rivers in the watershed of the Great Lakes, including Lake Huron. Native lampreys are not large enough to have a significant effect on the fish they prey on, however invasive sea lampreys are much larger, and fish that they prey on are much more prone to die as they are not used to such large parasites. It was estimated that only one in seven fish preyed on by sea lampreys would survive.^[27]

Fathom Five National Marine Park is part of the traditional unceded territory ofSaugeenOjibway people.Oral history dates the presence of Saugeen Ojibway peoples around 5480 BCE. The peninsula is a spiritual destination for many Ojibway Nations, who would travel to the peninsula to partake inpotlatches and ceremonies throughout the seasons. The traditional territory of the Saugeen Ojibway included the modern day towns of Collingwood, Arthur, Alliston, and Goderich, the watersheds of the Saugeen river, the Sauble river, the Wasaga river and the islands surrounding the Bruce peninsula. The Saugeen people speak a dialect of theAlgonquin language.^[28]

Food security for the Saugeen Ojibway people has been an ongoing political issue. All the major fisheries are located on the Saugeen Ojibway people's region and it is their main source of food. The local fisheries have been dominated by big corporations. This food resource needs to have legal access by Saugeen Ojibway people granted by the government. Prior toEuropean arrival the Saugeen Ojibway people's territory extended as far as Southern Ontario. This includes 6,500 km² (2,500 sq mi) extending into southern Ontario, 500 km of shoreline and 10,000 km² (3,900 sq mi) of Lake Huron, and harvesting rights on 930 hectares (2,300 acres) of a hunting reserve. Commercial food markets do exist around the region and are a 25 minute drive from the reserve. Though this creates a challenge for those with no access to a motor vehicle. The older demographic of the Saugeen Ojibway people expressed that there is a decline in the Lake Huron'swhitefish population. The whitefish is symbolic of cultural and generational ceremonies for the Saugeen Ojibway people. It is a symbol of a successful harvest and the Saugeen Ojibway people have a ceremony where the "chief" summons the whitefish and appreciate the lake for providing them with source of food and livelihood. These are age old rituals that have been practiced since the 1800s where the Saugeen Ojibway people surrendered their land to the British crown.^[29]

Parks Canada is a Federal agency that specializes in protection and conservation of national parks throughout Canada. The entity was formed to ensure the preservation of ecological indicators and species. The Giigoonyang (Fishes) project collaboration between Saugeen Ojibway people and Parks Canada. The collaboration is designed to combineindigenous knowledge about the land area with western technology. Researchers will use this to monitor and analyze fisheries data to forecast population growth or decline. This research is essential as it ensures food security for the Saugeen Ojibway people territory. Since it is their primary source that they rely on, this collaboration will benefit both parties involved. Since Parks Canada is a Federal agency, it will allow the Saugeen Ojibway people to make necessary progress in their legal demands for their food security and territory. A Federal agency is more likely to implement effective change in comparison to a provincial entity due to the hierarchal structure of the government agencies in Canada. The secondary goal of Parks Canada is to fill the knowledge gap they have with regards to Fathom Five National Marine Park's lake systems. Specific to fish migration and ecosystems that directly affect the fisheries industry. The main aim is to be able to create sustainable fishing practices in order to ensure Lake Huron's fish population.^[30]

The park is home to several shipwrecks, many of which are used for scuba diving and some shallower ones are used for snorkelling.

The park also has three non-shipwreck dive sites, these are Dunks Point,Big Tub Lighthouse Point and The Anchor.^[31][32]

• National Parks of Canada
• List of National Parks of Canada
• List of shipwrecks in the Great Lakes

Wikimedia Commons has media related toFathom Five National Marine Park.

• Official site
• Friends of Fathom Five

• IUCN Category VI
• National Marine Conservation Areas
• Marine parks of Canada
• National parks in Ontario
• Parks in Bruce County
• Protected areas established in 1987
• Dark-sky preserves in Canada
• 1987 establishments in Ontario
• Georgian Bay

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