Monitoring submersed vegetation in a mesotrophic lake: correlation of two spatio-temporal scales of change |
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| Affiliation: | 1. Jiangxi Provincial Key Laboratory of Water Resources and Environment of Poyang Lake, Jiangxi Institute of Water Sciences, Nanchang 330029, China;2. Research Institute of Ecology & Environmental Sciences, Nanchang Institute of Technology, Nanchang 330099, China;3. Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China;1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Mathematics, Indian Institute of Technology, Kharagpur, 721302, India;2. Department of Basic Sciences, International Institute of Information Technology, Bhubaneswar, 751003, India;1. Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China;2. Jiangxi Provincial Key Laboratory of Water Resources and Environment of Poyang Lake, Jiangxi Institute of Water Sciences, Nanchang 330029, China;1. Department of Stratigraphy and Paleontology, Faculty of Geology, University of State of Rio de Janeiro (UERJ), Av. San Francisco Xavier, 524, 4037F, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil;2. University of State of Amazonas (UEA), Av. Djalma Batista, 3578, Flores, CEP 69050-010 Manaus, Brazil;3. Department of Geosciences and GeoBioTec, University of Aveiro, 3810-193 Aveiro, Portugal;4. Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal;5. University of Urbino “Carlo Bo”, DiSTeVA, 61029 Urbino, Italy;6. Micropaleontology Laboratory, LabMicro, University Federal of State of Rio de Janeiro – UNIRIO, Av. Pasteur, 436, Urca, 22290-240 Rio de Janeiro, Brazil;1. Indian Institute of Technology Jodhpur, Jodhpur 342037, India;2. Department of Physics, University of Rajasthan, Jaipur 302004, India;3. Indian Institute of Technology Bombay, Mumbai 400076, India |
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| Abstract: | The submersed vegetation of mesotrophic, alkaline Chenango Lake in New York, USA, was monitored at two spatio-temporal scales: a 200 m2 grid censused annually from 1978 to 1993 and again in 2001 (12,800 quadrats), and a 1.8 ha littoral zone sampled every 6–10 years (1978, 1984, 1991, and 2001; 3600 quadrats). The grid vegetation fluctuated rather erratically for the first 11 years with each of the dominant species showing a different pattern of change. Frequency values for Chara vulgaris were the most dynamic, while those for Vallisneria americana were the most stable. After 1989, grid vegetation declined, so that by 2001, only four of the original 11 species were present (including the original dominants), and the total number of observations declined to <10% of the maximum recorded. This decline is attributed to vigorous benthic feeding by carp (Cyprinus carpio), not noted in 1978 but relatively abundant by 2001. Frequency changes of species in the 200 m2 grid were positively correlated with corresponding frequency changes in the 1.8 ha littoral zone, indicating that a small, carefully chosen area may reflect vegetation at a larger scale. This was particularly true when vegetation change was appreciable. |
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