High abundance and diversity of consumers associated with eutrophic areas in a semi-desert macrotidal coastal ecosystem in Patagonia, Argentina

Identifying factors that influence expression of eutrophication in a central California estuary

“…Tidal range has been identified in other studies as an important variable affecting estuarine eutrophication (Monbet 1992, Cloern 2001, Martinetto et al 2010, and our results from Elkhorn Slough found tidal range to be the single most important filter of eutrophication expression, both in the multivariate and univariate analyses. Decreases in tidal range correlated significantly with increased DO variation, increased chl a, increased daytime pH, decreased sediment quality, and increased cover of floating algal mats.…”

“…Greater tidal amplitude increases tidal mixing, which leads to decreases in stratification and residence time, and increases the transport of primary producers and nutrients out of the system (Nixon et al 1996, Cloern 2001, Uncles et al 2002. Martinetto et al (2010) found that increases in tidal range can filter the effects of eutrophication on secondary indicators (hypoxia and benthic invertebrate abundance); despite high nutrient inputs and algal growth, secondary indicators of eutrophication were absent in areas of high tidal exchange. Increases in residence time can lead to higher temperatures and phytoplankton blooms (Largier et al 1997, Valiela et al 1997.…”

Top-down and bottom-up regulation in a high nutrient–high herbivory coastal ecosystem

“…Besides the large exchange of water, there are areas with high macroalgal biomass and diversity near the town of San Antonio Oeste (see Fig. 1; Martinetto et al 2010). The average growth velocity of Ulva lactuca at this site is 20 to 25% d -1 , which is 2 to 5-fold higher than those reported in some eutrophic sites around the world (Mondego estuary, Venice lagoon, and Urias estuary; Teichberg et al 2010).…”

Temperature-dependent adverse effects of drifting macroalgae on the survival of Manila clams in a eutrophic coastal lagoon

“…In addition, hydrologically more-active environments are less likely to accumulate drifting macroalgae and retain it for long periods of time (Hauxwell & Valiela 2004). It has been reported that large water flushing during the tidal cycle prevented hypoxic events and consequently allowed for the occurrence of high densities of infaunal and epifaunal invertebrates, even in a eutrophic macroalgae-proliferating ecosystem (Martinetto et al 2010). Hence, water depth and energy regime may affect algae-induced hypoxia with more prominent effects in shallower and lower energy environments, such as semienclosed coastal Nakaumi Lagoon.…”