A clam garden (k’yuu kudhlk’aat’iija in the Haida language, [1] lux̌ʷxiwēys in the Kwakʼwala language [2] : 2 [3] ) is a traditional Indigenous management system used principally by Coast Salish peoples. [4] : 205 Clam gardens are a form of mariculture, [5] : 308 where First Nations peoples created an optimal habitat for clams by modifying the beach. [6] : 2 These clam gardens are a food source for both First Nations peoples and animals. [3] They also provide food security as they are a food source that can be readily harvested year-round. [6] : 2
Clam gardens are found along the west coast of North America. [7] [8] Over 2,000 clam gardens have been identified on the coast of Alaska, British Columbia, Washington and California. [6] : 7 [8] Though most clam gardens are currently untended, restoration of sections of previously untended clam gardens are occurring in Fulford Harbour on Salt Spring Island and on Russell Island located in the Gulf Islands National Park Reserve. [9] [10]
Once a location was chosen by an individual or a group of First Nations peoples, clam garden construction began with the creation of a boulder or rock wall along the shoreline of a beach. [6] Strong individuals would roll large boulders down to the lowest tideline on the beach, thus creating a rock wall. [4] : 207 The rising tide brings sediment over the rock walls, where it accumulates and creates an extended soft sediment beach area, creating ideal clam habitat. [4] : 207 The rock wall is low enough that it allows the clam garden to be submerged at high tide, but tall enough that the beach is exposed for harvesting during low tide. [4] : 207
Due to weather and the movement of tides, rock walls require continual maintenance. [3] [4] : 207 Historically, clam gardens were regularly tended to by First Nations individuals who moved rocks from inside the clam gardens onto the rock wall. [4] : 207 Both archeological evidence and traditional knowledge assert that boulder walls were built up over time and continually maintained. [4] : 207 New rocks were regularly added to the top of the boulder wall when First Nations peoples harvested the clam beds. [4] : 207 [11] : 8
The accumulation of sediment trapped by the boulder wall creates a flatter beach, which is an optimal growing habitat for clams. [6] : 2 This sediment has an optimal density for clam growth, free from fine clay and silt particles that are washed away by the high tide. [4] : 207
The density of the sediment was also due to the process of aerating the sand while clams were harvested. [3] Many clam gardens also have a high amount of gravel and shell hash, which aid in aerating the sand. [6] : 8 [12] : 6 This density allows for freer movement of clams, [3] in addition to easier removal of clams from the sediment. [4] : 204
Clam gardens are an ideal habitat for many animals. The modified beach attracts growth of many clams, notably: butter, littleneck, cockle and horse clams. [4] : 204 [6] : 3 Animals such as barnacles, chiton, snails, crabs, eels, mussels, octopus, urchin, and sea cucumbers also live in clam gardens. [3] [4] : 208 [13] [14] Other animals such as ghost shrimp and worms are found buried in the loose sediment. [3]
Clam gardens were a food source for many Coast Salish peoples, and provided food security to many diverse First Nation communities. This was due to the abundance of clams that could be easily harvested and were readily accessible. [4] : 202 : 205 Women and children were the primary group tasked with harvesting clams at low tide, though everyone in the community could participate. [5] : 308 [12] : 2 Once harvested, families could consume the clams immediately or smoke them to be preserved for the winter. [4] : 205 Resources of clams, either smoked or harvested from the gardens were important since they served as sustenance when other foods were scarce. [2] : 5 Some nations, such as the Kwakwaka’wakw nation, traditionally harvested clams from October to early March so as to avoid the red tide. [4] : 204 [15] : 11
Clam gardens were not exclusive to humans but also served as a protein-rich food source for various animals during the spring or summer, [3] such as raccoons, mink, river otters, bears, sea ducks, and geese. [4] : 208
Traditional clam harvesting also allowed for intergenerational knowledge transmission, with Elders passing down knowledge about clam gardens to the next generation. [5] : 308 Clam gardens were similar to an outdoor classroom, where traditional knowledge, language and cultural practices could be learned by the community. [5] : 308
Each Nation has specific protocols and governance systems around land management, and many access areas are family-based. [15] : 11 For clam gardens, families often asserted ownership by regularly tending to the beach and maintaining the rock wall. [6] : 9 These clam gardens were stewarded for the next generation. [8] Historically, unmanaged clam gardens could be harvested by anyone in the community. [12] : 8 Families could claim ownership by building their own clam garden on an undeveloped beach area in their traditional territory. [2] : 5
The exact age of the origin of clam gardening is unknown. In present day, scholars argue that accurately dating clam gardens is difficult due to the rock wall being submerged, in addition to rising sea levels. [10]
Archeologists are studying the ages of clam gardens using methods such as optically stimulated luminescence and radiocarbon dating on the rock wall. [11] : 12 Scholars are using both methods to gain a better understanding of the age of clam gardens. [11] : 12 The results are different depending on the sample as evidence suggests walls were built up by communities over time. [11] : 12 Some dating results suggest that clam gardens range from 1000 to 1700 years old, [11] : 12 whereas other samples indicate that they date back to 3000–3500 years ago. [8] [16]
Conversely, many First Nations peoples have a different perspective of clam garden creation. For example, Clan Chief Adam Dick, Kwaxsistalla of the Kwakwaka'wakw nation, states that clam gardens have been around “since the beginning of time.” [4] : 202 Tom Sewid, a native watchman of the Mamalilikulla-Qwe'Qwa'Sot'Em nation, states that his ancestors have maintained clam gardens over "thousands of years", citing clam gardens as proof of title to his traditional lands. [3]
"The Clam Garden Network", a loose affiliation of academics, researchers and First Nations groups, was formed to share current research and traditional First Nations practices related to clam garden management. [17]
In 2014, restoration work began to revive two clam gardens in the Gulf Islands National Park Reserve in a project between Parks Canada and the Hul'q'umi'num and Saanich nations. [9] [18]
The Swinomish Tribe of Washington built a new clam garden on Kiket Island in 2022. It is believed to be the first clam garden built in the United States in over 200 years. [19]
An island or isle is a piece of land, distinct from a continent, completely surrounded by water. There are continental islands, which were formed by being split from a continent by plate tectonics, and oceanic islands, which have never been part of a continent. Oceanic islands can be formed from volcanic activity, grow into atolls from coral reefs, and form from sediment along shorelines, creating barrier islands. River islands can also form from sediment and debris in rivers. Artificial islands are those made by humans, including small rocky outcroppings built out of lagoons and large-scale land reclamation projects used for development.
Shellfish is a colloquial and fisheries term for exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms. Although most kinds of shellfish are harvested from saltwater environments, some are found in freshwater. In addition, a few species of land crabs are eaten, for example Cardisoma guanhumi in the Caribbean. Shellfish are among the most common food allergens.
Clam is a common name for several kinds of bivalve molluscs. The word is often applied only to those that are edible and live as infauna, spending most of their lives halfway buried in the sand of the seafloor or riverbeds. Clams have two shells of equal size connected by two adductor muscles and have a powerful burrowing foot. They live in both freshwater and marine environments; in salt water they prefer to burrow down into the mud and the turbidity of the water required varies with species and location; the greatest diversity of these is in North America.
Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. The class includes the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. Shipworms bore into wood, clay, or stone and live inside these substances.
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Barrier islands are a coastal landform, a type of dune system and sand island, where an area of sand has been formed by wave and tidal action parallel to the mainland coast. They usually occur in chains, consisting of anything from a few islands to more than a dozen. They are subject to change during storms and other action, but absorb energy and protect the coastlines and create areas of protected waters where wetlands may flourish. A barrier chain may extend for hundreds of kilometers, with islands periodically separated by tidal inlets. The largest barrier island in the world is Padre Island of Texas, United States, at 113 miles (182 km) long. Sometimes an important inlet may close permanently, transforming an island into a peninsula, thus creating a barrier peninsula, often including a beach, barrier beach. Though many are long and narrow, the length and width of barriers and overall morphology of barrier coasts are related to parameters including tidal range, wave energy, sediment supply, sea-level trends, and basement controls. The amount of vegetation on the barrier has a large impact on the height and evolution of the island.
A seawall is a form of coastal defense constructed where the sea, and associated coastal processes, impact directly upon the landforms of the coast. The purpose of a seawall is to protect areas of human habitation, conservation, and leisure activities from the action of tides, waves, or tsunamis. As a seawall is a static feature, it will conflict with the dynamic nature of the coast and impede the exchange of sediment between land and sea.
Soft-shell clams or Sand gaper, scientific name Mya arenaria, popularly called "steamers", "softshells", "piss clams", "Ipswich clams", or "Essex clams", are a species of edible saltwater clam, a marine bivalve mollusk in the family Myidae.
Donax is a genus of small, edible saltwater clams, marine bivalve molluscs with highly variable color patterns. The genus is sometimes known as bean clams or wedge shells; however, Donax species have different common names in different parts of the world. In the southeastern U.S. they are known as "coquina", a word that is also used for the hard limestone concretions of their shells and those of other marine organisms. They are called "Chip Chip" in Trinidad & Tobago and "Chipi Chipi" in Venezuela, "Stumpfmuschel" in German, and "Zaaje" in Dutch. In South Vanuatu Languages they are called "Kaiwi" or "Tumbar".
The California mussel is a large edible mussel, a marine bivalve mollusk in the family Mytilidae.
The Coast Salish are a group of ethnically and linguistically related Indigenous peoples of the Pacific Northwest Coast, living in the Canadian province of British Columbia and the U.S. states of Washington and Oregon. They speak one of the Coast Salish languages. The Nuxalk nation are usually included in the group, although their language is more closely related to Interior Salish languages.
The food of the Tlingit people, an indigenous group of people from Alaska, British Columbia, and the Yukon, is a central part of Tlingit culture, and the land is an abundant provider. A saying amongst the Tlingit is that "When the tide goes out the table is set."This refers to the richness of intertidal life found on the beaches of Southeast Alaska, most of which can be harvested for food. Another saying is that "in Lingít Aaní you have to be an idiot to starve". Since food is so easy to gather from the beaches, a person who cannot feed himself at least enough to stay alive is considered a fool, perhaps mentally incompetent or suffering from very bad luck. Though eating off the beach could provide a fairly healthy and varied diet, eating nothing but "beach food" is considered contemptible among the Tlingit, and a sign of poverty. Shamans and their families were required to abstain from all food gathered from the beach, and men might avoid eating beach food before battles or strenuous activities in the belief that it would weaken them spiritually and perhaps physically as well. Thus for both spiritual reasons as well as to add some variety to the diet, the Tlingit harvest many other resources for food besides what they easily find outside their front doors. No other food resource receives as much emphasis as salmon; however, seal and game are both close seconds.
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Dana Sue Lepofsky is a Canadian archaeologist and ethnobiologist. She is a professor at Simon Fraser University, a former president of the Society of Ethnobiology, and received the Smith-Wintemberg Award in 2018. Her research focuses on the historical ecology of the indigenous peoples of the Pacific Northwest Coast.
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Pinna bicolor, also known as razorfish, razor clam, or pen shell, is a species of large saltwater clam in the family Pinnidae. It is commonly found in shallow waters up to 50 m (160 ft) deep. It can be found embedded in firm muddy intertidal sediments, seagrass beds, and reef flats along continental and island shores.
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