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Dredging Operations In A Subtropical Urban Estuary: Effects On Population Structure Of Benthic Macrofauna Inhabiting River Margins | 18429
Journal of Marine Science: Research & Development
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Little is known about the effects of dredging activities upon indirectly affected areas like river margins. On an urbanized
subtropical estuary in southern Brazil, benthic macrofauna was sampled throughout two dredging events on control and
impacted areas. Granulometry and river discharge were also accessed. Univariate PERMANOVAs with five factors (Time,
Area, Event, Station, Sector) were applied on Euclidean distance matrices of abundances for the most representative taxa
H. similis, H. australis, K. schubartii, N. fluviatilis
, Polydora sp. = 91% total abundance) to test the null hypothesis of no
differences in population densities upon dredging. Results evidenced small scale disturbances, indicating that dredging along
with environmental variations affects studied populations; effects differ between the two margins and the resilience times
range from 3 to 9 months. Greatest overall abundance was recorded during dredging operations, when river discharge readings
showed the lowest values, indicating that dredging should be performed during periods of low river discharge.
Tito Almeida has completed his PhD at the age of 37 years from Federal University of Sao Carlos ? Sao Paulo/ BRAZIL and postdoctoral studies from UNIVALI. He
is Associated Professor of UNIVALI since 2001 and responsible for the Community Ecology Laboratory. He has published more than 26 papers in reputed journals
and has been serving as an editorial board member Brazilian Journal of Environmental Technology.
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