Articles & Publications
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- Author(s):
- Cottingham, K. L., S. R. Carpenter
- Abstract:
Predictive indicators of the rate of ecosystem recovery after a perturbation (resilience) could be valuable tools for ecological studies that need to anticipate system response to perturbation. We used a simulation model of summer phosphorus cycling in north temperate lakes to (1) evaluate whether resilience decreases with increasing food web length and increases with increasing nutrient loading and (2) test the correspondence be- tween two potential indicators of resilience (nutrient turnove…
- Date Published:
- 1994
- Record Visibility:
- Public
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- Author(s):
- Stearns, F. W.
- Abstract:
Few undisturbed remnants still exist of the great mass of hardwood and conifer forest that covered much of northern Wisconsin in the presettlement period. Today even these small remnants are being eliminated or altered drastically under the pressures created by lumber scarcity. In 1946 the writer studied three of the remaining undisturbed stands with two primary objectives: to record quantitatively the composition of the climax forest; and to obtain any information possible on the autecol…
- Date Published:
- 1949
- Record Visibility:
- Public
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- Author(s):
- Stearns, F. W.
- Abstract:
The composition of the sugar maple-hemlock-yellow birch association in northern Wisconsin
- Date Published:
- 1951
- Record Visibility:
- Public
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- Author(s):
- Stearns, F. W.
- Abstract:
The composition of a remnant of white pine forest in the lake states
- Date Published:
- 1950
- Record Visibility:
- Public
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- Author(s):
- Allan, J. D.
- Abstract:
Two cladocerans, Daphnia parvula and Holopedium gibberum, were studied to determine (a) whether the species were competing and (b) whether the observed coexistence was predictable from competitive relationships alone. Experimental manipulations of intra— and interspecific competition using 14C—labelled algae, bacteria, and detritus revealed clear competitive effects only with algae. Some resource partitioning was demonstrated. A model was proposed specifying Holopedium to be the poorer compet…
- Date Published:
- 1973
- Record Visibility:
- Public
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- Author(s):
- Arnott, S. E.
- Abstract:
Some bog lakes in northern Wisconsin and Michigan lack fish because of low pH and low winter oxygen concentrations. The lakes are characterized by a dominance oflarge zooplankton species. Small zooplankton species are scarce, whereas in nearby lakes with fish they are common. The importance of biotic and abiotic factors in preventing the successful invasion of small zooplankton species into these fishless lakes was determined using a series of field manipulations. The relative importance of c…
- Date Published:
- 1993
- Record Visibility:
- Public
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- Author(s):
- Hoekman, D
- Abstract:
Understanding how communities respond to changes in temperature is a major challenge for community ecology. Temperature influences the relative degree to which top-down and bottom-up forces structure ecological communities. In greenhouse experiments using the aquatic community found in pitcher plants (Sarracenia purpurea), I tested how temperature affected the relative importance of top-down (mosquito predation) and bottom-up (ant carcasses) forces on protozoa and bacteria populations. While …
- Date Published:
- 2010
- Record Visibility:
- Public
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8
Article
- Author(s):
- Hansson, L.-A.
- Abstract:
With the aim of assessing the principal structuring forces for algal biomass development, I conducted field studies along a productivity gradient of Swedish and Antarctic lakes. In accordance with predictions from current ecological theory, the regression slope for Swedish (functionally three trophic levels) than for Antarctic lakes (functionally two trophic levels). This difference suggests that, besides the effect of nutrients, the food chain composition in aquatic systems has a crucial im…
- Date Published:
- 1992
- Record Visibility:
- Public
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- Author(s):
- von Ende, C. N.
- Abstract:
In sampling 22 lakes in the Upper Peninsula of Michigan, I found that 2 species of Chaoborus, C. punctipennis and C. americanus, never co—occurred (von Ende 1975). Chaoborus punctipennis was found only in lakes with fish whereas C. americanus occurred along in stained, bog lakes without fish. Third and 4th instar C. americanus lack extensive diel, vertical migratory behavior and are found near the surface waters in stained bog lakes. Adults of this species emerge in the middle of May. Third a…
- Date Published:
- 1979
- Record Visibility:
- Public
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- Author(s):
- Hooper, C. A.
- Abstract:
The algal epiphytes of three species of Sphagnum from the mat edge of an acid bog were quantitatively sampled over three months. On the basis of differences in total algal abundance, algal diversity, and the growth of certain algal species and species groups, two significantly different algal communities were recognized. While these communities were only centimeters apart, they differed in physical, biological and nutrient parameters, with lower, moister plots having more algae, higher algal …
- Date Published:
- 1981
- Record Visibility:
- Public
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- Author(s):
- H. Cyr, M. L. Pace
- Abstract:
Physiological rates of individual organisms are well related to their body size. These allometric relationships suggest that ecological rates should also be related to the size structure of organisms in populations, communities, and ecosystems. We describe size distributions of zooplankton communities and explore the implications of such dis? tributions on community grazing rates. Ninety zooplankton communities, varying in bio? mass and in size distributions, were sampled in 28 lakes in north…
- Date Published:
- 1993
- Record Visibility:
- Public
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- Author(s):
- S. R. Carpenter, J. F. Kitchell, J. R. Hodgson, P. A. Cochran, J. J. Elser, M. M. Elser, D. M. Lodge, D. Kretchmer, X. He, C. N. von Ende
- Abstract:
We performed whole-lake manipulations of fish populations to test the hypothesis that higher trophic levels regulate zooplankton and phytoplankton community structure. biomass.and primary productivity. The study involved three lakes and spanned 2 yr. Results demonstrated hierarchical control of primary production by a biotic factors and a trophic cascade involving fish predation. In Paul Lake. the reference lake. Productivity varied from year to year, illustrating the effects of climatic fa…
- Date Published:
- 1987
- Record Visibility:
- Public