Introduction to the Proceedings of the 1971 Symposium on Salmonid Communities in Oligotrophic Lakes

Loftus, K. H.; Regier, Henry A.

doi:10.1139/f72-109

Cited by 52 publications

(20 citation statements)

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“…The importance of disturbance in the system as an aid to invasion is uncertain but probably not a major factor. All of the Great Lakes were experiencing cultural perturbations at the time (Loftus & Regier, 1972), but habitat quality in the upper Great Lakes and tributaries was much superior to that of Lake Erie. Most of the tributaries to Lake Erie were degraded to the point where they could not sustain lamprey spawning and development of ammocoetes.…”

Section: Sea Lampreymentioning

confidence: 99%

Non-indigenous species in the Great Lakes: were colonization and damage to ecosystem health predictable?

Leach

1995

Journal of Aquatic Ecosystem Health

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The Great Lakes ecosystem is home to at least 139 non-indigenous species of fauna and flora which have become established following invasions or intentional introductions. About ten percent of the exotic species have caused economic or ecological damage to the system. A sample of this group is reviewed to determine if ecological concepts are useful in helping to predict colonization and impacts to ecosystem health. Successful colonization by most of the species reviewed was predictable from habitat requirements and behaviour. Ecosystem disturbance was a factor in the success of some of the colonists but was not an overriding ecological requirement. Perturbations to ecosystem health are more difficult to predict and in most cases were not readily apparent from knowledge about the ecology of invaders or native communities. The main damage to ecosystem health by the species reviewed resulted from competition, predation and habitat modification. Difficulties in predicting both invasions and damage from successful colonists point to the need to prevent non-indigenous species from reaching the Great Lakes basin.

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Section: Sea Lampreymentioning

confidence: 99%

Non-indigenous species in the Great Lakes: were colonization and damage to ecosystem health predictable?

Leach

1995

Journal of Aquatic Ecosystem Health

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“…In much the same way, the structural regulation of fish communities has been recognized to operate in relation to trophic status of water bodies (see Loftus & Regier, 1972;Hartmann, 1978). In view of the current prevalence of Trophic Cascade Theory, with its understanding that ecosystems may be frequently, if not continuously, controlled downwards by their top predators (Carpenter et al, 1985), it seems important to establish standards which apply to particular types of water body and habitat zones (Christie, 1991;Schneiders et al, 1991;Rojanschi et al, 1991).…”

Section: Indicators Of Ecosystem Conditionmentioning

confidence: 99%

The ecosystems approach to water management. The main features of the ecosystems concept

Reynolds

1993

J Aquat Ecosyst Stress Recov

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This paper summarizes the conceptual basis for ecosystemic water management, principally as it is discernible through a series of discussion papers contributed to the UN/ECE Seminar held in Oslo in May, 1991. The 'ecosystems approach' seeks the objective management of water quality in lakes and river catchments, the sustainable exploitation of water resources (sensu lato) and the maintenance of biodiversity within aquatic catchments. It also seeks an attitude founded upon the sharing of habitat with other ecosystem components and the minimization of human impact. Moreover, there is no final condition: rather, there is an ethos always to improve performance. Emphasis is nevertheless placed on the unevolved, subclimactic state in which many ecosystems find themselves and the elasticity of structure which this imparts and which may, within limits, be exploited. Methods for assessing environmental quality and for measuring the performance of corrective management are briefly discussed. Future progress is suggested to be less than easy but proper ecosystemic attitudes and approaches are seen to be essential ingredients if past mistakes are to be overcome.

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“…Historic data sets exist on the abundance of lake trout in each of the Great Lakes, some extending as far back as the 1800's. The species thrives and reproduces well in pristine oligotrophic systems and exhibits a graded response to stresses such as eutrophication (Loftus & Regier, 1972). It is therefore an excellent indicator of general ecosystem state and also provides a diagnostic capability.…”

Section: Ecosystem Indicatorsmentioning

confidence: 99%

The development of ecosystem objectives for the Laurentian Great Lakes

Reynoldson

1993

J Aquat Ecosyst Stress Recov

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Historically management of human use of ecosystems has been based around engineering and chemical approaches and through the construction of treatment facilities, effluent controls and setting chemical concentrations, both at end of pipe and in the aquatic environment. However, the general continued degradation of many ecosystems shows these approaches alone are insufficient. In the Laurentian Great Lakes the Great Lakes Water Quality Agreement was first signed in 1972 and ratified in 1978 and in 1987 tacitly acknowledged the problems with a chemical only approach by requiring the development of ecosystem objectives in the 1978 agreement. Furthermore, the agreement specifically identified numerical ecosystem objectives in the 1987 agreement. The evolution of ecosystem objectives in the Great Lakes has expanded from the strictly numerical objectives such as production of lake trout and abundance of the amphipod Pontoporeia hoyi. More recent developments in ecosystem objectives have been the inclusion of indicators for wildlife, habitat, human health and stewardship.

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Introduction to the Proceedings of the 1971 Symposium on Salmonid Communities in Oligotrophic Lakes

Abstract: not available

Cited by 52 publications

References 0 publications

Non-indigenous species in the Great Lakes: were colonization and damage to ecosystem health predictable?

Non-indigenous species in the Great Lakes: were colonization and damage to ecosystem health predictable?

The ecosystems approach to water management. The main features of the ecosystems concept

The development of ecosystem objectives for the Laurentian Great Lakes

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