Showing papers in "Journal of Great Lakes Research in 1995"

TL;DR: A large-scale study of Saginaw Bay was initiated in 1990 and continued through 1993 to examine the effects of the zebra mussel colonization which began in summer/fall 1991 as mentioned in this paper.

TL;DR: Progress toward lake trout restoration in Lake Superior is described, management actions are reviewed, and the effectiveness of those actions is evaluated; especially stocking lake trout as a tool for building spawning stocks, and subsequently, populations of wild recruits.

TL;DR: In this article, the authors measured turbidity near the shore of Saginaw Bay to determine if more light resulting from colonization of zebra mussels ( Dreissena polymorpha Pallas) in 1990 corresponded with changes in macrophyte distribution.

TL;DR: Data demonstrate that, following Dreissena proliferation, light penetration, benthic algal biomass, chlorophyll concentrations and rates ofbenthic primary productivity have increased, which coincided with a shift from diatom domination of the benthal algal community to a flora dominated by filamentous green algae (Zygnematales).

TL;DR: Filtration rates of the zebra mussel (Dreissena polymorpha) on natural seston from two different regions in Saginaw Bay were determined on a monthly basis from April to October in 1992 and 1993.

TL;DR: In this article, the effects of zebra mussel colonization on phytoplankton photosynthesis-irradiance parameters, chlorophyll concentrations, underwater extinction coefficients (kPAR), and surface irradiance were determined at 8-10 sites on 27 occasions in Saginaw Bay from spring 1990 through fall 1993 corresponding to a period before and after the establishment of large zebra population.

TL;DR: Increased stocking of predatory salmonids to suppress the alewives could enhance survival of fry and speed restoration in Lake Ontario, but suppression seems unlikely under current strategies to manage the alewife as forage for non-native salmonids.

TL;DR: In this article, the authors examined the short-term effects of zebra mussels (Dreissena polymorpha) on ecosystem processes in late August 1991 in Saginaw Bay, Lake Huron.

TL;DR: A detailed overview of lake trout restoration in Lake Michigan can be found in this article, where a 40% total mortality goal lakewide, creating two large refuges designed to encompass historically the most productive spawning habitat and protect trout stocked over their home range, evaluating several lake trout strains and setting stocking priorities throughout the lake.

TL;DR: Although food concentrations declined to low levels in 1993 and both densities and soft-tissue weight of Dreissena declined, it is not clear whether populations in the bay have peaked and are now at equilibrium with the surrounding environment.

TL;DR: In this paper, the authors assess results of rehabilitation and establish a historical basis for comparison by quantifying the catch of spawning lake trout from Michigan waters in 1929-1932 and show that Seneca-strain lake trout did not appear to be attacked by sea lampreys until they reached a size > 532 mm.

TL;DR: Many of the obstacles which may have impeded lake trout rehabilitation in Lake Ontario during the 1980s are slowly being removed, and there are signs of a general ecosystem recovery.

TL;DR: In this paper, the authors examined the effect of zebra mussel colonization in Saginaw Bay, Lake Huron, relative to the pre-zebra invasion in 1991.

TL;DR: It is concluded that zebra mussels, in regions where they are abundant, can cause significant changes in composition of both the protozoan and phytoplankton communities.

TL;DR: The round goby (Neogobius melanostomus), a native of the Black and Caspian seas, has spread from the original point of discovery in the St Clair River to Lakes St. Clair, Erie, Huron, Michigan, and Superior.

TL;DR: Thiamine, but none of the other B-vitamins, was effective both in reversal and prevention of the clinical signs and mortality associated with the swim-up syndrome.

TL;DR: Historical differences among native lake trout populations, genetic comparisons of populations, heritability of physiological traits, performance of strains after stocking, and the role of genetics in management are reviewed.

TL;DR: Zebra mussels appeared to decrease community uptake rates of ammonium in August and September but did not predictably affect nitrogen remineralization rates by other lower foodweb organisms (e.g. bacteria, protozoans, zooplankton).

TL;DR: The MSSL Global Lakes Database (MGLD) as discussed by the authors contains locational and lake type information for over 1,400 inland water bodies including, as far as possible, all lakes and reservoirs (but not lagoons), with surface areas ≥ 100km2.

TL;DR: Habitat factors that affect early life stages of lake trout suggests several priorities for research and management, and limited data suggest that egg and fry predators, particularly exotic species, may critically affect fry production and survival.

TL;DR: Results using different sizes of fluorescent microspheres suggest that zebra mussels have a lower limit for particle size removal that is less than 0.4 μm, and a hypothesized smaller size of bacteria at outer bay sites may enable them to escape heavy predation pressure from mussels and the high rates of mussel nutrient excretion may facilitate their growth in these nutrient depleted conditions.

TL;DR: Overall, the species appears to be rather adaptable and able to colonize new environments that satisfy basic habitat requirements and be responsible for difficulties in reestablishing reproducing populations of lake trout in the lower Great Lakes.

TL;DR: The potential for lake trout restoration in Lake Ontario appears to be limited by a scarcity of good spawning sites, low egg deposition on spawning sites recognized by researchers, and excessive swim-up mortality.

TL;DR: Data demonstrate that the composition and abundance of the calanoid community after 1983 is not unlike that of 1960s and that species diversity is more diverse than the cladoceran community in the 1990s as compared to the early 1980s and correlational analysis suggest that alewife and bloater chubs are affecting size and biomass of larger species of zooplankton as well as Bythotrephes.

TL;DR: A survey revealed that there have been introductions of the lake trout in 15 countries around the world as mentioned in this paper, most of which were in Canada and the United States, and most of these were off the North American continent, three failed, four established reproducing populations, and six require regular stocking.

TL;DR: Managers need to reconsider current strategies and time requirements necessary to achieve restoration goals and objectives for lake trout in Lake Ontario.

TL;DR: Two of the microbial screening tests, specifically, the Sediment-Chromotest®, which measures inhibition of the inducible enzyme, β-galactosidase, in E. coli, and the Microtox® Solid-Phase Test (measures inhibition of bioluminescence), correlated with results from tests with invertebrates, particularly decreased survival of C. riparius and reproduction by T. tubifex.

TL;DR: Examination of daily-growth increments on the sagittae and back-calculation from the date of capture revealed that most fish hatched between 6 June and 19 July in 1990 and between 30 April and 30 May in 1991, and the estimated incubation period is about 7 months for lake trout eggs at this site.

TL;DR: Evidence that biotic factors, particularly predation, may be limiting early survival of wild lake trout juveniles in many areas of the Great Lakes is examined and recommendations for research to better define field feeding rates of lake trout egg and fry predators are made.