http://hdl.handle.net/1813/11150 2013-05-26T03:09:55Z 2013-05-26T03:09:55Z Rudstam, Lars Watkins, James Holeck, Kristen Munawar, Mohi Munawar, I. Fatima Fitzpatrick, Mark Niblock, Heather Bowen, Kelly Koops, Marten Lozano, Steve Weidel, Brian Walsh, Maureen Lantry, Brian Stewart, Thomas Johnson, Timothy Schaner, Ted Lantry, Jana Connerton, Michael Dove, Alice Luckey, Fred http://hdl.handle.net/1813/30404 2012-10-05T05:01:05Z 2012-10-04T00:00:00Z

Title: Analysis of Lake Ontario Lower Aquatic food web Assessment (LOLA 2003 and 2008) within the context of long-term ecological change Authors: Rudstam, Lars; Watkins, James; Holeck, Kristen; Munawar, Mohi; Munawar, I. Fatima; Fitzpatrick, Mark; Niblock, Heather; Bowen, Kelly; Koops, Marten; Lozano, Steve; Weidel, Brian; Walsh, Maureen; Lantry, Brian; Stewart, Thomas; Johnson, Timothy; Schaner, Ted; Lantry, Jana; Connerton, Michael; Dove, Alice; Luckey, Fred Abstract: Lake Ontario is the 13th largest lake in the world with a surface area of 18,500 km² (Reynolds et al. 2000), has a population in the watershed of over 8 million, and provides a range of ecosystem services to the people in the watershed (freshwater for various uses, shipping, fisheries, and recreation). Currently, extensive surveys for each Great Lake occur on a rotating five-year schedule. This report presents the status of Lake Ontario’s lower trophic levels in 2008 and a detailed comparison with similarly collected in 2003 and with data collected by the collaborating agencies and Cornell University and discuss observed changes in relation to changes in nutrient concentration and food web configuration in Lake Ontario. There has been a spatial restructuring of the Lake Ontario offshore ecosystem through the increase in the deep chlorophyll layer and associated zooplankton. This has resulted in a Lake Ontario that in 2008 is more similar to Lakes Superior, Huron and Michigan than to the Lake Ontario of the 1990s. Major findings are Nutrients: Spring offshore total phosphorus and soluble reactive phosphorus increased from 2003 to 2008, but summer levels did not. Lake-wide average total phosphorus levels remained at or below the target level of 10 µg/L in all three seasons of 2008. Lake-wide nutrient concentrations have declined since the 1960s. However, phosphorus concentrations have been stable (~7-10 µg/L) since the mid-1990s. Spring silica was similar in 2003 and 2008 and was depleted by the summer in both years. This indicates continued spring diatom production in Lake Ontario. Phytoplankton: Summer epilimnetic chlorophyll-a increased by a factor of 2, the proportion of autotrophic algae increased, and summer water clarity declined from 2003 to 2008. Summer chlorophyll-a levels in 2008 were similar to the concentrations in the 1981-1995 time period. However, the trend towards mesotrophy in the summer of 2008 may be limited to that year as it was not followed by increased values in 2009 to 2011. Most of the chlorophyll in the water column was located in a deep chlorophyll layer in the thermocline. Zooplankton: Offshore epilimnetic zooplankton density and biomass declined from 2003 to 2008 by a factor of 5 to 12 in the summer and by a factor of 1.5 to 2.6 in the fall. This is consistent with long-term trends of declining epilimnetic zooplankton abundance including a larger decline in 2004-2005 coincident with an increase in the predatory Bythotrephes. Whole water column zooplankton density also declined from 2003 to 2008 in the summer and fall, but zooplankton biomass only declined in the fall. Large changes in whole water column zooplankton community composition occurred between 2003 and 2008 from a cyclopoid/bosminid dominated system in 2003 to a calanoid dominated system in 2008. Mysids, Diporeia and Mussels Mysid densities were similar in 2003 and 2008 indicating continued high biomass of mysids in Lake Ontario. In July of 2008, the biomass of Mysis diluviana was 17% of the crustacean zooplankton biomass in the offshore of Lake Ontario (depth >30m). Mysid densities appear stable in Lake Ontario. The native benthic amphipod Diporeia declined further in 2008 and is almost extirpated from Lake Ontario. Quagga mussels are very abundant as deep as 90 m, but populations in shallow water declined from 2003 to 2008. Few zebra mussels were present in either 2003 or 2008.

2012-10-04T00:00:00Z Rudstam, Lars G. Luckey, Fred Koops, Marten http://hdl.handle.net/1813/29691 2012-09-06T18:03:02Z 2012-09-06T00:00:00Z

Title: Water Quality in Offshore Lake Ontario During Intensive Sampling Years 2003 and 2008: Results from the LOLA (Lake Ontario Lower Foodweb Assessment) Program Authors: Rudstam, Lars G.; Luckey, Fred; Koops, Marten Abstract: Intensive sampling of the offshore waters of Lake Ontario occurs on a five-year cycle. The 2003 and 2008 binational sampling program is known as the Lake Ontario Lower foodweb Assessment (LOLA). Research cruises were conducted in spring (April), summer (July or August) and fall (September) along several north-south transects. Trophic indicators in this data package include nutrients (total phosphorus (TP), soluble reactive phosphorus (SRP), dissolved silicate(Si02), and total dissolved inorganic nitrogen(nitrate and nitrite), water clarity (Secchi depth), and chlorophyll a. Other measurements measured include density and biomass of zooplankton, assessment of phytoplankton and the microbial food web, benthic community assessment, and water column profiles (temperature, fluorescence, turbidity, and oxygen). Description: This data package must be uncompressed for use. In addition to the data described above, it includes an Ecological Metadata Language (EML) record, which describes in considerable detail the contents of the data table(s), methods, usage rights, and other information. All users of these data are strongly encouraged to review this EML record.

2012-09-06T00:00:00Z Rudstam, Lars G. Luckey, Fred Koops, Marten http://hdl.handle.net/1813/29689 2012-09-05T17:46:29Z 2012-09-05T00:00:00Z

Title: Zooplankton in Offshore Lake Ontario during Intensive Sampling Years 2003 and 2008: Results from the LOLA (Lake Ontario Lower Foodweb Assessment) Program. Authors: Rudstam, Lars G.; Luckey, Fred; Koops, Marten Abstract: Intensive sampling of the offshore waters of Lake Ontario occurs on a five-year cycle. The 2003 and 2008 binational sampling program is known as the Lake Ontario Lower foodweb Assessment (LOLA). Research cruises were conducted in spring (April), summer (July or August) and fall (September) along several north-south transects. This data package includes epilimnetic (surface layer) and whole water column measurements for zooplankton size (mm), density (#/m3) and biomass (mg dry weight/m3) by species for each site. Veliger size and density from these tows are included as a separate file. Other trophic indicators measured during this program include nutrients (total phosphorus, dissolved silica), water clarity (secchi depth), dissolved oxygen, chlorophyll a, and an assessment of phytoplankton, the microbial food web and the benthic community. Description: This data package must be uncompressed for use. In addition to the data described above, it includes an Ecological Metadata Language (EML) record, which describes in considerable detail the contents of the data table(s), methods, usage rights, and other information. All users of these data are strongly encouraged to review this EML record.

2012-09-05T00:00:00Z Watkins, James Rudstam, Lars Holeck, Kristen http://hdl.handle.net/1813/24566 2011-11-05T05:01:46Z 2011-11-04T00:00:00Z

Title: Length-weight regressions for zooplankton biomass calculations – A review and a suggestion for standard equations Authors: Watkins, James; Rudstam, Lars; Holeck, Kristen Abstract: Zooplankton biomass can be estimated through the use of equations that convert length of individuals to dry weight. The logarithmic transformation of these power equations follow the form Ln(W) =Ln(α) + β Ln(L) where L is length in mm, W is dry weight in ug, and α and β are species-specific values. Several sets of L-W equations have been developed for use in the Great Lakes region by agencies such as the Environmental Protection Agency (EPA) and Canada’s Department of Fisheries and Oceans (DFO). Since we collaborate with both agencies and require comparability with previously collected data, we reviewed these two sets of equations and the publications that were used to develop them. We offer a third Cornell Standard (CBFS STD) set that resolves many of the discrepancies seen in the other sets.

2011-11-04T00:00:00Z Rudstam, Lars Jackson, James R. http://hdl.handle.net/1813/12693 2009-07-07T20:10:28Z 2009-05-14T20:14:31Z

Title: Estimates of walleye abundance for Oneida Lake, NY (1957-2008) Authors: Rudstam, Lars; Jackson, James R. Abstract: The Cornell Biological Field Station (CBFS) serves as a primary field site for aquatic research at Cornell University (more information can be found at http://www.dnr.cornell.edu/fieldst/cbfs.htm) and is part of the Department of Natural Resources, College of Agriculture and Life Sciences at Cornell University. The centerpiece of the station's research program is a 50-year database on the food web of Oneida Lake, New York, that has been collected with support from the Cornell University Brown Endowment and from the New York State Department of Environmental Conservation. The data are collected by personnel from the Cornell Biological Field Station and include limnology, benthos, zooplankton, phytoplankton, and fish survey data, primarily from Oneida Lake and spanning 1957 to the present. This dataset reports the CBFS estimates of walleye abundance at different stage and age groups in Oneida Lake. These estimates are based on data from standard trawl (1961-2008; http://hdl.handle.net/1813/11217) and gill net catches (1959-2008; http://hdl.handle.net/1813/11216), mark-recapture estimates for age 4 and older walleye, an analysis combining these data sets (Irwin et al. 2008), Miller sampler surveys for larval walleye, and information from the Constantia Fish Cultural Station on number of newly hatched larval walleye stocked each year. There are two primary data tables: one with the estimated abundance in # fish/ha for age 1 and older walleye in April of each year, and one with estimated abundance, length, and sampling dates for age-0 walleye (larvae, juveniles, age-1 in the following spring). An additional table, catchability, contains numbers used to estimate walleye abundance as described in the methods section. Description: This data package must be uncompressed for use. In addition to the data described above, it includes an Ecological Metadata Language (EML) record, which describes in considerable detail the contents of the data table(s), methods, usage rights, and other information. All users of these data are strongly encouraged to review this EML record.

2009-05-14T20:14:31Z Rudstam, Lars Jackson, James R. http://hdl.handle.net/1813/12243 2011-08-23T15:05:21Z 2009-04-15T20:33:18Z

Title: Ice Cover data for Oneida and Cazenovia Lakes, New York, 1826-2011 Authors: Rudstam, Lars; Jackson, James R. Abstract: The Cornell Biological Field Station (CBFS) serves as a primary field site for aquatic research at Cornell University (more information can be found at http://www.dnr.cornell.edu/fieldst/cbfs.htm) and is part of the Department of Natural Resources, College of Agriculture and Life Sciences. The centerpiece of the station's research program is a 50-year database on the food web of Oneida Lake, New York, that has been collected with support from the Cornell University Brown Endowment and from the New York State Department of Environmental Conservation. The data are collected by personnel from the Cornell Biological Field Station and include limnology, benthos, zooplankton, phytoplankton, and fish survey data, primarily from Oneida Lake and spanning 1957 to the present. This dataset reports the data on ice cover of Oneida Lake and the nearby Cazenovia Lake. Description: This data package must be uncompressed for use. In addition to the data described above, it includes an Ecological Metadata Language (EML) record, which describes in considerable detail the contents of the data table(s), methods, usage rights, and other information. All users of these data are strongly encouraged to review this EML record.

2009-04-15T20:33:18Z Rudstam, Lars Mills, Edward http://hdl.handle.net/1813/11229 2008-08-14T15:12:09Z 2008-08-14T15:12:09Z

Title: Limnological summary and depth profile for six standard sampling sites on Oneida Lake, New York, 1975 - 2006 Authors: Rudstam, Lars; Mills, Edward Abstract: The Cornell Biological Field Station (CBFS) serves as a primary field site for aquatic research at Cornell University (more information can be found at http://www.dnr.cornell.edu/fieldst/cbfs.htm) and is part of the Department of Natural Resources, College of Agriculture and Life Sciences. The centerpiece of the station's research program is a 50-year database on the food web of Oneida Lake, New York, that has been collected with support from the Cornell University Brown Endowment and from the New York State Department of Environmental Conservation. The data are collected by personnel from the Cornell Biological Field Station and include limnology, benthos, zooplankton, phytoplankton, and fish survey data, primarily from Oneida Lake and spanning 1957 to the present. This data package includes three tables. The first is a summary of limnological data gathered during standard sampling of Oneida Lake from 1975 - 2006. The second provides profile data by depth for temperature, dissolved oxygen, pH, and conductivity. A supplemental table provides the coordinates of the six sampling sites. Description: This data package must be uncompressed for use. In addition to the data described above, it includes an Ecological Metadata Language (EML) record, which describes in considerable detail the contents of the data table(s), methods, usage rights, and other information. All users of these data are strongly encouraged to review this EML record.

2008-08-14T15:12:09Z Rudstam, Lars Mills, Edward http://hdl.handle.net/1813/11228 2011-08-23T14:34:40Z 2008-08-14T15:07:58Z

Title: Phytoplankton survey of Oneida Lake, New York, 1975 - 1995 Authors: Rudstam, Lars; Mills, Edward Abstract: The Cornell Biological Field Station (CBFS) serves as a primary field site for aquatic research at Cornell University (more information can be found at http://www.dnr.cornell.edu/fieldst/cbfs.htm) and is part of the Department of Natural Resources, College of Agriculture and Life Sciences. The centerpiece of the station's research program is a 50-year database on the food web of Oneida Lake, New York, that has been collected with support from the Cornell University Brown Endowment and from the New York State Department of Environmental Conservation. The data are collected by personnel from the Cornell Biological Field Station and include limnology, benthos, zooplankton, phytoplankton, and fish survey data, primarily from Oneida Lake and spanning 1957 to the present. This data package contains results of phytoplankton surveys of Oneida Lake, New York between 1975 - 1995. The primary table gives densities of 153 phytoplankton taxa identified in samples collected from five standard sites. Supplemental tables provide explanations of the taxonomic codes used in the primary table as well as geographic coordinates for the sampling sites. In years subsequent to 1995, phytoplankton samples were processed by an environmental consulting company. These data are not published here; please contact the data owners for more information. Description: This data package must be uncompressed for use. In addition to the data described above, it includes an Ecological Metadata Language (EML) record, which describes in considerable detail the contents of the data table(s), methods, usage rights, and other information. All users of these data are strongly encouraged to review this EML record.

2008-08-14T15:07:58Z Rudstam, Lars Jackson, James R. http://hdl.handle.net/1813/11217 2011-09-15T18:03:56Z 2008-08-07T18:18:00Z

Title: Standard trawl sampling data, Oneida Lake, NY, 1961 - 2010 Authors: Rudstam, Lars; Jackson, James R. Abstract: The Cornell Biological Field Station (CBFS) serves as a primary field site for aquatic research at Cornell University (more information can be found at http://www.dnr.cornell.edu/fieldst/cbfs.htm) and is part of the Department of Natural Resources, College of Agriculture and Life Sciences. The centerpiece of the station's research program is a 50-year database on the food web of Oneida Lake, New York, that has been collected with support from the Cornell University Brown Endowment and from the New York State Department of Environmental Conservation. The data are collected by personnel from the Cornell Biological Field Station and include limnology, benthos, zooplankton, phytoplankton, and fish survey data, primarily from Oneida Lake and spanning 1957 to the present. This dataset reports data collected during standardized trawl sampling efforts at ten sites on Oneida Lake in central New York State from 1961 to 2006. Data from an additional seven shallow water sites that were sampled during 1971 and 1973 - 1977 are also reported in this dataset. The trawl summary table contains total catch, total weight, and mean weight data by species and age group (adult and young of year) for each sampling date. Weight is not available for all groups and time periods. Additional tables report catch per unit effort by year and age (1-6+ and 1-7+, respectively) for yellow perch and walleye. Auxiliary tables contain explanations of species codes and latitudes and longitudes for the ten standard sampling sites as well as the seven additional sites that were sampled in the 1970s. Description: This data package must be uncompressed for use. In addition to the data described above, it includes an Ecological Metadata Language (EML) record, which describes in considerable detail the contents of the data table(s), methods, usage rights, and other information. All users of these data are strongly encouraged to review this EML record.

2008-08-07T18:18:00Z Rudstam, Lars Jackson, James R. http://hdl.handle.net/1813/11216 2012-01-03T16:23:05Z 2008-08-07T17:17:11Z

Title: Gill net survey of fishes of Oneida Lake, NY, 1957 – 2010 Authors: Rudstam, Lars; Jackson, James R. Abstract: The Cornell Biological Field Station (CBFS) serves as a primary field site for aquatic research at Cornell University (more information can be found at http://www.dnr.cornell.edu/fieldst/cbfs.htm) and is part of the Department of Natural Resources, College of Agriculture and Life Sciences. The centerpiece of the station's research program is a 50-year database on the food web of Oneida Lake, New York, that has been collected with support from the Cornell University Brown Endowment and from the New York State Department of Environmental Conservation. The data are collected by personnel from the Cornell Biological Field Station and include limnology, benthos, zooplankton, phytoplankton, and fish survey data, primarily from Oneida Lake and spanning 1957 to the present. This data package contains tables summarizing data collected during standardized gill net sampling efforts conducted from 1957 - 2010. The three primary tables summarize abundances of thirty-seven species for each sample date, yearly catch per unit effort for thirty-seven species, and yearly totals by age class for yellow perch, walleye, and smallmouth bass. Auxiliary tables contain latitudes and longitudes of standard sampling sites and explanations of species names used in the primary tables. Description: This data package must be uncompressed for use. In addition to the data described above, it includes an Ecological Metadata Language (EML) record, which describes in considerable detail the contents of the data table(s), methods, usage rights, and other information. All users of these data are strongly encouraged to review this EML record.

2008-08-07T17:17:11Z