Changes in Distribution and Abundance of Submerged Macrophytes in the Inner Bay at Long Point, Lake Erie: Implications for Foraging Waterfowl

Knapton, Richard W.; Petrie, Scott A.

doi:10.1016/s0380-1330(99)70777-x

Cited by 48 publications

(37 citation statements)

References 42 publications

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“…5), particularly Athya affinis (Table 5), were abundant from 1982 to 2001 and seem suited to benefit from an expansion of H. verticillata. This species dives and consumes tubers (Knapton and Petrie 1999), and during migration in the southern United States they were observed to equally utilize ponds planted with either H. verticillata or native SAV species (Dick et al 2004).…”

Section: Discussionmentioning

confidence: 99%

“…Rapid expansion of exotics in an ecosystem threatens its stability by the possible displacement of native SAV species (Madsen et al 1991;Knapton and Petrie 1999), particularly if the exotic SAV has low value as a food and habitat source for waterfowl (Dick et al 2004). These negative effects of exotic species on native species of SAV and on waterfowl are sometimes used as support for regional aquatic weed-eradication programs.…”

mentioning

confidence: 99%

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Long‐term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality

Rybicki

Landwehr

2007

Limnology & Oceanography

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We assessed species-specific coverage (km 2 ) of a submerged aquatic vegetation (SAV) community in the fresh and upper oligohaline Potomac Estuary from 1985 to 2001 using a method combining field observations of species-proportional coverage data with congruent remotely sensed coverage and density (percent canopy cover) data. Biomass (estimated by density-weighted coverage) of individual species was calculated. Under improving water quality conditions, exotic SAV species did not displace native SAV; rather, the percent of natives increased over time. While coverage-based diversity did fluctuate and increased, richness-based community turnover rates were not significantly different from zero. SAV diversity was negatively related to nitrogen concentration. Differences in functional traits, such as reproductive potential, between the dominant native and exotic species may explain some interannual patterns in SAV. Biomass of native, as well as exotic, SAV species varied with factors affecting water column light attenuation. We also show a positive response by a higher trophic level, waterfowl, to SAV communities dominated by exotic SAV from 1959 to 2001.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Long‐term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality

Rybicki

Landwehr

2007

Limnology & Oceanography

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“…Located on the Atlantic flyway, the abundant submerged aquatic vegetation and protected waters of the bay and marsh complexes make Long Point a waterfowl staging area of international importance (Knapton and Petrie, 1999;Prince et al, 1992 (Ball et al, 2003). The regional and international importance of Long Point has been recognized through designations as a UNESCO World Biosphere Reserve, a RAMSAR wetland of international significance, and an Important Bird Area.…”

Section: Long Point Study Areamentioning

confidence: 99%

Long-term effects of a Phragmites australis invasion on birds in a Lake Erie coastal marsh

Robichaud

Rooney

2017

Journal of Great Lakes Research

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“…Long Point Inner Bay is a shallow bay on the northern shore (Ontario) of Lake Erie. The major tributary, Big Creek, drains a primarily agricultural watershed (Knapton and Petrie, 1999). This site has been used as a reference site for the Presque Isle Bay studies, and prevalences of skin tumors between 3 and 11% and liver tumors between 0 and 3% were observed in earlier surveys (Blazer and others, 2009a,b).…”

Section: Sitesmentioning

confidence: 99%

Assessment of the fish tumor beneficial use impairment in brown bullhead (<i>Ameiurus nebulosus</i>) at selected Great Lakes Areas of Concern

Blazer¹,

Mazik²,

Iwanowicz³

et al. 2014

Open-File Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS. For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprodTo order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Blazer, V.S., Mazik, P.M., Iwanowicz, L.R., Braham, R.P., Hahn, C.M., Walsh H.L., and Sperry, A.J., 2014, Assessment of the fish tumor beneficial use impairment in brown bullhead (Ameiurus nebulosus) at selected Great Lakes Areas of Concern: U.S. Geolological Survey Open-File Report 2014-1105, 17 p., http://dx.doi.org/10.3133/ofr20141105. ISSN 2331-1258 iii Acknowledgments AbstractA total of 878 adult brown bullhead were collected at 11 sites within the Lake Erie and Lake Ontario drainages from 2011 to 2013. The sites included seven Areas of Concern (AOC; 670 individuals), one delisted AOC (50 individuals) and three non-AOC sites (158 individuals) used as reference sites. These fish were used to assess the "fish tumor or other deformities" beneficial use impairment. Fish were anesthetized, weighed, measured and any external abnormalities documented and removed. Abnormal orocutaneous and barbel tissue, as well as five to eight pieces of liver, were preserved for histopathological analyses. Otoliths were removed and used for age analyses. Visible external abnormalities included reddened (raised or eroded), melanistic areas and raised growths on lips, body surface, fins, and barbels. Microscopically, these raised growths included papilloma, squamous cell carcinoma, osteoma, and osteosarcoma. Proliferative lesions of the liver included bile duct hyperplasia, foci of cellular alteration, bile duct (cholangioma, cholangiocarcinoma) and hepatocellular (adenoma, hepatic cell carcinoma) neoplasia. The two reference sites (Long Point Inner Bay, Conneaut Creek) at which 30 or more bullhead were collected had a skin tumor prevalence of 10 percent (%) or less and liver tumor prevalence of 4% or less. Presque Isle Bay, recently delisted, had a similar liver tumor prevalence (4%) and slightly higher prevalence (12%) of skin tumors. The prevalence of skin neoplasms was 15% or less at sites in the Black River, Cuyahoga River, and Maumee AOCs, while more than 20% of the bullheads from the Rochester Embayment, Niagara River, Detroit River, and Ashtabula River AOCs had skin tumors. The prevalence of liver tumors was greater than 4% at all AOC sites except the Old Channel site at the Cuyahoga River AOC, Wolf Creek within the Maumee AOC, and the upper and lower sites ...

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Changes in Distribution and Abundance of Submerged Macrophytes in the Inner Bay at Long Point, Lake Erie: Implications for Foraging Waterfowl

Cited by 48 publications

References 42 publications

Long‐term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality

Long‐term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality

Long-term effects of a Phragmites australis invasion on birds in a Lake Erie coastal marsh

Assessment of the fish tumor beneficial use impairment in brown bullhead (<i>Ameiurus nebulosus</i>) at selected Great Lakes Areas of Concern

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