Richard C. Lathrop

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R. C. LATHROP,* , † B. M. JOHNSON,‡ T. B. JOHNSON,§ M. T. VOGELSANG,* S . R. CARPENTER,† T. R. HRABIK,† J . F . KITCHELL,† J . J . MAGNUSON,† L. G. RUDSTAM– and R. S . STEWART* *Wisconsin Department of Natural Resources, Madison, WI, USA †Center for Limnology, University of Wisconsin-Madison, Madison, WI, USA ‡Department of Fishery and Wildlife Biology,(More)
Linear models were developed for predicting mean Secchi disk depth readings as a measure of water clarity for the summer months in Lake Mendota, Wisconsin. The 20-yr (1976–1995) data set also included external phosphorus (P) loadings and in-lake April P concentrations as indices of lake nutrient status, and monthly (28 d) water column stabilities and(More)
Understanding the drivers and consequences of disease epidemics is an important frontier in ecology. However, long-term data on hosts, their parasites, and the corresponding environmental conditions necessary to explore these interactions are often unavailable. We examined the dynamics of Daphnia pulicaria, a keystone zooplankter in lake ecosystems, to(More)
Although limnologists have long been interested in regional patterns in lake attributes, only recently have they considered lakes connected and organized across the landscape, rather than as spatially independent entities. Here we explore the spatial organization of lake districts through the concept of landscape position, a concept that considers lakes(More)
Regime shifts, or massive changes in ecosystems, are often associated with thresholds in drivers such as climate, land-use change, nutrient fluxes, or other factors. A frequently studied example is eutrophication, which is a serious environmental problem of lakes and reservoirs associated with phosphorus (P) enrichment above a threshold. We estimated(More)
Lathrop, R.C. 2007. Perspectives on the eutrophication of the Yahara lakes. Lake and Reserv. Manage. 23:345– 365. Eutrophication of the four Yahara lakes—Mendota, Monona, Waubesa, and Kegonsa—near Madison, Wisconsin, has been dramatic since the mid-1800s. For Lake Mendota, the erosion of sediments from higher water levels established by the damming of the(More)
High densities of zoobenthos inhabited Lake Mendota's profundal zone in the early 1900s through the mid-1940s. Chaoborus punctipennis was the most abundant organism during the winter, along with moderate densities of Chironomus spp., Pisidium sp., oligochaetes, and Procladius sp. By the early 1950s, Chaoborus punctipennis densities had declined to 10% of(More)
Cultural eutrophication of lakes caused by excess phosphorus (P) loading from agricultural areas is a persistent and serious environmental problem. We quantified P flows in a watershed-lake ecosystem using a simple mathematical model that coupled in-lake and upland processes to assess and compare the long-term impacts of various management strategies. Our(More)
Changes in fertilizer use, manure management or precipitation may alter the frequency of episodes of high nutrient runoff and thereby affect annual nutrient loads and total nutrient concentrations of lakes. We developed an empirical, stochastic model for daily P loads and used the model to project annual P loads and summer total P concentrations in Lake(More)
Phosphorus (P) loading, exports and concentrations of the four lakes of the Yahara chain (Wisconsin, USA) were compared under four load-reduction plans using a model calibrated with 29–33 years of annual data. P mitigation goals must balance reductions in P concentrations in the four lakes and the export from the lake chain to downstream waters. Lake(More)