{"id":32348,"date":"2020-06-03T10:14:08","date_gmt":"2020-06-03T14:14:08","guid":{"rendered":"https:\/\/www.fondriest.com\/news\/?p=32348"},"modified":"2024-12-27T17:00:37","modified_gmt":"2024-12-27T21:00:37","slug":"monitoring-the-lake-shaping-plant-growth-in-lake-st-pierre","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/monitoring-the-lake-shaping-plant-growth-in-lake-st-pierre.htm","title":{"rendered":"Monitoring the Lake-shaping Plant Growth in Lake St. Pierre"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Researchers in Quebec are taking underwater photos to get a fish-eye view of lake-shaping aquatic plants. They\u2019re proving the use of a technique that could expand the study of plant populations that impact everything from a lake\u2019s plankton and fish populations to its water levels.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Photo analysis could replace more expensive and labor-intensive methods.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cIf you want to have good data, you have to dive and collect plants and dry them and weigh them,\u201d said Andrea Bertolo, a professor of environmental science at the <\/span><a href=\"https:\/\/www.uqtr.ca\/\"><span style=\"font-weight: 400;\">University of Quebec at Trois-Rivi\u00e8res<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0 Soon, anyone with an underwater camera and a selfie stick could be contributing to this valuable science.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Bertolo, along with his graduate student and the principal investigator, Patricia Bolduc, outlined their new method and findings about the relationship between plant communities and zooplankton diversity and size in research published in the <\/span><a href=\"https:\/\/www.sciencedirect.com\/journal\/journal-of-great-lakes-research\"><span style=\"font-weight: 400;\">Journal of Great Lakes Research<\/span><\/a><span style=\"font-weight: 400;\"> in January.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Proving that cheaper also means accurate<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">\u00a0<\/span><span style=\"font-weight: 400;\">\u201cThe goal of the paper,\u201d Bertolo said, \u201cwas to find a way to assess plant biomass in a more cost-effective way.<\/span><\/p>\n<div id=\"attachment_32351\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-32351\" class=\"wp-image-32351 size-large\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-4-600x450.jpg\" alt=\"plant abundance camera\" width=\"600\" height=\"450\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-4-600x450.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-4-300x225.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-4-768x576.jpg 768w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-4.jpg 875w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-32351\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Researchers dive to gather information about plant diversity and abundance in Lake St. Pierre. (Credit: Patricia Bolduc) <\/span><\/p><\/div>\n<span class='bctt-click-to-tweet'><span class='bctt-ctt-text'><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fwww.fondriest.com%2Fnews%2F%3Fp%3D32348&#038;text=Instead%20of%20bringing%20plants%20to%20the%20surface%2C%20researchers%20dove%20down%20with%20cameras%20and%20took%20photos%20of%20plants%20from%20below%2C%20with%20the%20sky%20as%20backdrop.&#038;via=FondriestEnv&#038;related=FondriestEnv' target='_blank'rel=\"noopener noreferrer\">Instead of bringing plants to the surface, researchers dove down with cameras and took photos of plants from below, with the sky as backdrop. <\/a><\/span><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fwww.fondriest.com%2Fnews%2F%3Fp%3D32348&#038;text=Instead%20of%20bringing%20plants%20to%20the%20surface%2C%20researchers%20dove%20down%20with%20cameras%20and%20took%20photos%20of%20plants%20from%20below%2C%20with%20the%20sky%20as%20backdrop.&#038;via=FondriestEnv&#038;related=FondriestEnv' target='_blank' class='bctt-ctt-btn'rel=\"noopener noreferrer\">Share on X<\/a><\/span>\n<p><span style=\"font-weight: 400;\">They took the photos back to the lab, counted the pixels that contain plants and those that contain sky (as seen through the water) and found a measure of plant cover and abundance. Averaging the plant cover from the photos taken at different points around the boat provides measures of plant abundance that are nearly as accurate as those gathered by divers who collected plants in the area directly after. Similar photographic methods are used in forestry to determine tree cover in an area of forest, Bertolo said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Researchers can also use these photos to assess plant diversity by identifying different leaf types and structures in the photos.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The manual nature of this photo analysis means that the work is still relatively labor-intensive. But that could change with applications of deep learning, which could allow computers to identify the differences in color or leaf shape on their own, Bertolo said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Full automation of the analysis process is complicated, Bertolo said. Because water can be crystal clear, cloudy or anywhere in between, it can be difficult for standard computer tools to tell the difference between plant and sky, which could appear differently colored from day-to-day.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The process could be even easier, using selfie sticks and cheap underwater cameras.<\/span><\/p>\n<div id=\"attachment_32352\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-32352\" class=\"size-large wp-image-32352\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-3-600x450.jpg\" alt=\"plant abundance camera\" width=\"600\" height=\"450\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-3-600x450.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-3-300x225.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-3-768x576.jpg 768w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-3.jpg 940w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-32352\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Divers taking upward-facing photos of aquatic vegetation is a cheaper and easier method of estimating plant abundance and diversity in lakes. (Credit: Patricia Bolduc)<\/span><\/p><\/div>\n<p><span style=\"font-weight: 400;\">Instead of diving, researchers would only need to pilot a boat above the area they want to monitor, submerge the camera to a standard depth and take photos from several spots around the boat.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Citizen scientists could expand understandings of lake health<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">With faster, automated analysis of photos and the involvement of citizen scientists, aquatic plant monitoring could greatly expand.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Bertolo suggested that people who live or vacation yearly on lakes could easily help create a long-term series of photos that provide information about the microscopic communities there and the spread of invasive species.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This research found that more plants meant more and bigger zooplankton, Bertolo said. Bigger plankton more effectively control phytoplankton populations by grazing. Plants provide shelter to zooplankton that might be eaten in the open.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The researchers also tested whether plant structural diversity led to zooplankton diversity by providing more types of shelter. They found that it was an important predictor of zooplankton diversity.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Plant life shapes lake life<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Aquatic vegetation determines more than just plankton populations though.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In research<\/span><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0048969719353690?casa_token=8G7Hnnp0J00AAAAA:VE7ViMugM_5556HS_lktVbA2gAE95uuRi6KA4lGo_-T9roVgP89Z-_QrFhkosx6vPjSLcQUJP_4\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\"> published in the Science of Total Environment in May<\/span><\/a><span style=\"font-weight: 400;\">, Bertolo and another graduate student, Matteo Giacomazzo, found that declines in plant abundance in Lake St. Pierre corresponded to declines in the lake\u2019s yellow perch fishery. Since about 2000, plant abundance and yellow perch have been declining. Commercial and sport fishing of yellow perch in Lake St. Pierre was banned for five years in 2012. In 2017, the ban was extended until 2022.<\/span><\/p>\n<div id=\"attachment_32350\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-32350\" class=\"size-large wp-image-32350\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-2-600x450.jpg\" alt=\"plant abundance camera\" width=\"600\" height=\"450\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-2-600x450.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-2-300x225.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-2-768x576.jpg 768w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/06\/Lake_st-pierre_plant-2.jpg 940w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-32350\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Analysis of underwater photos like this can provide accurate measures of plant abundance and diversity. (Credit: Patricia Bolduc)<\/span><\/p><\/div>\n<p><span style=\"font-weight: 400;\">Gauging historical plant abundance is difficult. To do so, the researchers used the fact that plants hold back the flow of the lake, which is part of the St. Lawrence river system.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Before plants begin to grow in earnest for the year, around April, there is a natural drop in water level of 40 centimeters from the lake\u2019s inlet to its outlet. When plant growth reaches its peak, the difference can be closer to 90 centimeters. Because water level data goes back to the 1930s, they had a rough estimate of plant growth for the lake reaching back decades to compare to fish population records the government has kept for years.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The downward turn of plant abundance and yellow perch populations in 2000, matched an increase in the lake\u2019s turbidity that started at that time, Bertolo said. The increased cloudiness was cutting plants off from the sun.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">All these connections tell a compelling story of the changing ecology of the lake, even though the estimate for plant abundance isn\u2019t based on clear, specific records of plant abundance throughout the lake, Bertolo said. A long-term record of plant abundance from specific locations throughout Lake St. Pierre, and many others, doesn\u2019t yet exist.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With cheaper, faster and more accessible strategies for monitoring aquatic plant life, a long-term, specific record could be within reach.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Researchers use cheap underwater cameras and selfie sticks to drive down the cost of monitor plant life in 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