Changes in Environmental Conditions During Dreissena Colonization of a Monitoring Station in Eastern Lake Erie

Howell, E. Todd; Marvin, Christopher H.; Bilyea, Robert W.; Kauss, P. B.; Somers, Keith M.

doi:10.1016/s0380-1330(96)70993-0

Cited by 105 publications

(59 citation statements)

References 8 publications

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“…Many studies have demonstrated that beach sand can contain higher bacterial densities than water (Alm et al 2003;Ashbolt et al 1993;Elmanama et al 2005;Howell et al 1996;Oliveira and Pinhata 2008;Oliveira et al 2010). This may due to bacteria find in this environment protection against sunlight (DaviesColley et al 1999;Sinton et al 1994), nutrient favorable conditions (Brunke and Fischer 1999;Davies et al 1995;Villar et al 1999), and protection against protozoan predation (Davies and Bavor 2000).…”

Section: Discussionmentioning

confidence: 99%

Densities and antimicrobial resistance of Escherichia coli isolated from marine waters and beach sands.

Andrade

Zampieri

Ballesteros

et al. 2015

Environ Monit Assess

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Bacterial resistance is a rising problem all over the world. Many studies have showed that beach sands can contain higher concentration of microorganisms and represent a risk to public health. This paper aims to evaluate the densities and resistance to antimicrobials of Escherichia coli strains, isolated from seawater and samples. The hypothesis is that microorganisms show higher densities in contaminated beach sands and more antimicrobial resistance than the water column. Density, distribution, and antimicrobial resistance of bacteria E. coli were evaluate in seawater and sands from two recreational beaches with different levels of pollution. At the beach with higher degree of pollution (Gonzaguinha), water samples presented the highest densities of E. coli; however, higher frequency of resistant strains was observe in wet sand (71.9 %). Resistance to a larger number of antimicrobial groups was observe in water (betalactamics, aminoglycosides, macrolides, rifampicins, and tetracyclines) and sand (betagalactamics and aminoglycosids). In water samples, highest frequencies of resistance were obtain against ampicilin (22.5 %), streptomycin (15.0 %), and rifampicin (15.0 %), while in sand, the highest frequencies were observe in relation to ampicilin (36.25 %) and streptomycin (23.52 %). At the less polluted beach, Ilha Porchat, highest densities of E. coli and higher frequency of resistance were obtain in wet and dry sand (53.7 and 53.8 %, respectively) compared to water (50 %). Antimicrobial resistance in strains isolated from water and sand only occurred against betalactamics (ampicilin and amoxicilin plus clavulanic acid). The frequency and variability of bacterial resistance to antimicrobials in marine recreational waters and sands were related to the degree of fecal contamination in this environment. These results show that water and sands from beaches with a high index of fecal contamination of human origin may be potential sources of contamination by pathogens and contribute to the dissemination of bacterial resistance.

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Section: Discussionmentioning

confidence: 99%

Densities and antimicrobial resistance of Escherichia coli isolated from marine waters and beach sands.

Andrade

Zampieri

Ballesteros

et al. 2015

Environ Monit Assess

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“…Dreissenid mussels can potentially impact Cladophora growth by providing substrate for attachment (Wilson et al, 2006), altering pathways of phosphorus cycling (Hecky et al, 2004) and modifying the underwater light climate (Holland, 1993;Howell et al, 1996). Scientists familiar with Cladophora autecology have recognized that changes in the Great Lakes associated with the dreissenid invasion could have profound (Lowe and Pillsbury, 1995;Higgins et al, 2005a,b) and previously unrecognized (Hecky et al, 2004;Higgins et al, 2008) impacts on the potential for nuisance algal growth.…”

Section: Cladophora and Great Lakes Phosphorus Managementmentioning

confidence: 99%

Great Lakes Cladophora in the 21st century: same algae—different ecosystem

Auer

Tomlinson

Higgins

et al. 2010

Journal of Great Lakes Research

141

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“…The decadal-scale response of Cladophora tissue P quota (Q P ) to these counteracting pressures in the Great Lakes is not known. The lower Great Lakes have additionally experienced a significant increase in light penetration since dreissenid mussel establishment (Howell et al 1996) in response to decreased seston 2 Current address: Department of Biology and Large Lakes Observatory, University of Minnesota Duluth, 2205 5th St., Duluth, Minnesota, 55812. …”

mentioning

confidence: 99%

“…The decadal-scale response of Cladophora tissue P quota (Q P ) to these counteracting pressures in the Great Lakes is not known. The lower Great Lakes have additionally experienced a significant increase in light penetration since dreissenid mussel establishment (Howell et al 1996) in response to decreased seston concentration (Millard et al 2003) and, in Lake Ontario, possibly a reduced frequency of whiting events (Barbiero et al 2006). The resulting increase in euphotic depth may have increased the biomass of Cladophora occurring at previously light-limited depths and increased its areal extent of coverage (Zhu et al 2006).…”

mentioning

confidence: 99%

Modeling the growth response of Cladophora in a Laurentian Great Lake to the exotic invader Dreissena and to lake warming

Malkin

Guildford

Hecky

2008

Limnology & Oceanography

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A Cladophora growth model (CGM) is calibrated and validated here to simulate attached and sloughed Cladophora biomass in daily time-steps in an urbanized location of Lake Ontario, using two years of collected input data and independent measurements of Cladophora biomass. The CGM is used to hindcast Cladophora growth using multiplicative factors of seasonal minimal tissue phosphorus concentrations (Q P ) and seasonal mean nearshore light attenuation (Kd PAR ) of the early 1970s and 1980s relative to modern data. The possible effects of climate on growth are also forecast using additive temperature increases. Cladophora Q P in Lake Ontario has declined in parallel with decreasing pelagic P concentrations, resulting in reduced Cladophora biomass at all depths in the euphotic zone. Kd PAR has also declined, most strongly since the mid-1990s, following Dreissena mussel invasion, driving an increase in biomass between 3.5-and 10-m depth. Combining these effects, the CGM predicts that biomass along shorelines today is lower in Lake Ontario than in the 1980s. However, any increases in Q P in this post-dreissenid-mussel period will result in greater Cladophora proliferation than in previous decades due to increased nearshore water clarity. Cladophora Q P , while still currently lower than in the early 1980s, may be rising due to P supply to the littoral zone by the invasive mussels. The surface water temperature of Lake Ontario indicates warming of 0.96uC decade 21 from 1980 to 2006. With increasing surface water temperatures, the CGM predicts an earlier spring growth but only a marginal increase in peak Cladophora biomass.Eutrophication continues to be among the most critical and pervasive issues facing coastal waters-marine and freshwater alike ( Nuisance densities of Cladophora have been reported from estuaries (Gordon and McComb 1989;Valiela et al. 1997), inland seas (Kiirikki 1996;Curiel et al. 2004), and hardwater rivers and lakes with moderate energy (Power 1992;Parker and Maberly 2000). In the Laurentian Great Lakes, Cladophora is a nuisance throughout Lakes Ontario, Erie, and Michigan, where hard substrate is available, and in isolated areas near nutrient point sources in Lake Huron (Herbst 1969).There is a widespread perception that since the establishment of invasive dreissenid mussels (i.e., the zebra mussel [Dreissena polymorpha] and the quagga mussel [D. bugensis]) over the past 15 yr, Cladophora biomass has resurged in the lower Great Lakes (Mills et al. 2003;Hecky et al. 2004;Bootsma et al. 2005). The degree to which this perception is accurate, however, is unclear. Due to their high biomass in these lakes (e.g., up to 150 g shell-free DM m 22 ; Fleisher et al. 2001), dreissenid mussels have been credited with reengineering nutrient distributions by removing suspended particulate matter through filterfeeding, then excreting dissolved regenerated nutrients as well as generating organic waste as feces and pseudofeces in the benthos (Hecky et al. 2004). This process, recently termed ''benthification'...

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Changes in Environmental Conditions During Dreissena Colonization of a Monitoring Station in Eastern Lake Erie

Cited by 105 publications

References 8 publications

Densities and antimicrobial resistance of Escherichia coli isolated from marine waters and beach sands.

Densities and antimicrobial resistance of Escherichia coli isolated from marine waters and beach sands.

Great Lakes Cladophora in the 21st century: same algae—different ecosystem

Modeling the growth response of Cladophora in a Laurentian Great Lake to the exotic invader Dreissena and to lake warming

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