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Title: Decadal changes in the structure of Cymodocea nodosa seagrass meadows: natural vs. human influences
Authors: Tuya, F. 
Ribeiro-Leite, Luis
Arto-Cuesta, Noelia
Coca, Josep 
Haroun, Ricardo 
UNESCO Clasification: 241713 Ecología vegetal
Keywords: Seagrass
Water quality
Human-mediated impact
Canary Islands
Issue Date: 2014
Journal: Estuarine, Coastal and Shelf Science 
Abstract: Seagrass meadows are deteriorating worldwide. However, numerous declines are still unreported, which avoid accurate evaluations of seagrass global trends. This is particularly relevant for the western African coast and nearby oceanic archipelagos in the eastern Atlantic. The seagrass Cymodocea nodosa is an ecological engineer on shallow soft bottoms of the Canary Islands. A comparative decadal study was conducted in 21 C. nodosa seagrass meadows at Gran Canaria Island to compare the structure (shoot density, leaf length and cover) between 2003 and 2012. Overall, 11 meadows exhibited a severe regression, while 10 remained relatively stable. During this period, natural influences (sea surface temperature, Chlorophyll-a concentration and PAR light, as well as the number of storm episodes detaching seagrasses) had a low predictive power on temporal patterns in seagrass structure. In contrast, proximity from a range of human-mediated influences (e.g. the number of outfalls and ports) seem to be related to the loss of seagrass; the rate of seagrass erosion between 2003 and 2012 was significantly predicted by the number of human-mediated impacts around each meadow. This result highlights promoting management actions to conserve meadows of C. nodosa at the study region through efficient management of local impacts
ISSN: 0272-7714
DOI: 10.1016/j.ecss.2013.11.026
Source: Estuarine, Coastal and Shelf Science [ISSN 0272-7714], 9 p.
Rights: by-nc-nd
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