The Ecological and Evolutionary Implications of Recruitment for Competitively Structured Communities

Danielson, Brent J.; Stenseth, Nils Chr.

doi:10.2307/3544885

Cited by 5 publications

(1 citation statement)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the words of Rotenberry and Wiens (1980) "environmental variations obscure relationships between local populations"; conversely, local variation in bird community composition may be due to different phenomena instead of habitat selectivity, such as nesting success in the previous years, densities in the buffer zones and habitats, site fidelity and so on (O 'Connor and Fuller 1985;Danielson and Stenseth 1992;Wiens et al 1993;Andren 1994;Thomas 1994). Anyway, the dynamics of habitat patches and species producing variation at the local scale are not evident at the landscape mosaic level, as shown by the simulation model proposed by Urban and Shugart (1986), that is -as chaos theory suggests -local disorder translates into regional or global order (Gleick 1987).…”

Section: Discussionmentioning

confidence: 99%

A method for establishing bird conservation value at a landscape level

Fornasari

Carli

Bottoni

et al. 1997

Bird Conservation International

View full text Add to dashboard Cite

SummaryTo produce conservation indices from bird community data, with the aim of identifying and comparing areas of regional conservation concern, we selected bird community samples randomly over a large study area, without including habitat features a priori in the sampling procedure. Subsequently, we subjected the samples to a cluster analysis to identify a posteriori bird communities to be indexed together with their associated habitat and distribution/abundance on a regional scale. We identified 15 bird community types and were able to characterize each of them by a community conservation index (CCI) taking into account three different components of rarity: habitat selectivity, geographical distribution, and abundance. A cluster of four communities was associated with lowland farmland and woodland; another cluster of five was found at higher average altitudes and degree of urbanization; a third one of six showed a montane distribution. This third cluster showed much higher CCI values in comparison with the first two suggesting that the index here proposed is very sensitive to a high community selectivity and a restricted distribution/abundance.

show abstract

Section: Discussionmentioning

confidence: 99%

A method for establishing bird conservation value at a landscape level

Fornasari

Carli

Bottoni

et al. 1997

Bird Conservation International

View full text Add to dashboard Cite

show abstract

Babel, or the ecological stability discussions: an inventory and analysis of terminology and a guide for avoiding confusion

1997

View full text Add to dashboard Cite

We present an inventory and analysis of discussions of ecological stability, considering 163 definitions of 70 different stability concepts. Our aim is to derive a strategy that can help to dispel the existing "confusion of tongues" on the subject of "stability" and prevent its future recurrence. The strategy consists of three questions that should be kept in mind when communicating about stability properties. These three questions should overcome the three main sources of confusion in terminology. Firstly, which stability properties are being addressed in the stability statement? Our analysis shows that the general term "stability" is so ambiguous as to be useless.It can be replaced by the stability properties "staying essentially unchanged" (constancy), "returning to the reference state (or dynamic) after a temporary disturbance" (resilience), and "persistence through time of an ecological system" (persistence). Second, to what ecological situation does the statement refer? An ecological situation is defined by a set of features that, taken as a whole, determine the domain of validity of a stability statement. The six most important features form the "ecological checklist", which serves to classify ecological situations and thereby provides a system of coordinates for communication. The six points are: variable of interest, level of description, reference state, disturbance, spatial scale and temporal scale. Thirdly, is the statement anchored in the situation in question, or is there unacceptable generalisation by inferring "stability" of the whole system from a certain stability property in a certain ecological ecological situation? This question separates the scientifically valuable content of a statement from the desire for general statements which is often projected through stability statements.

show abstract

The effect of predation by wintering cormorants Phalacrocorax carbo on grayling Thymallus thymallus and trout (Salmonidae) populations: two case studies from Swiss rivers. Comment

Staub¹,

EGLOFF²,

Kramer³

et al. 1998

Journal of Applied Ecology

View full text Add to dashboard Cite

Summary Using the same data on the predation effect of cormorants Phalacrocorax carbo on the grayling Thymallus thymallus population located in the river Rhine below Lake Constance, Staub et al. (1992) and Suter (1995) reached contradictory conclusions (additional and compensatory mortality, respectively). This comment clarifies the reasons for the differences. The biomass of older fish (age classes 4 and 5–7) was not judged to be decreasing by Suter because of the use of inappropriate (parametric) inferential statistics and no use of power analysis. More powerful (non‐parametric) inferential tests show a significant decrease in biomass. Staub et al. compared fish numbers per length class in the angling catch (autumn) and in the spawning catch (spring). Differences were thought to be the effect of cormorant predation during winter. Suter converted fish numbers per length class into biomass per age class for the same comparisons. However, this conversion considered neither the length increases of grayling during winter (c. 1 cm) nor the dominance of faster growing males (> 1.5 cm longer than females of the same age) in the spawning catch. Thus, changes of the age pyramid during winter have been masked.

show abstract

The Ecological and Evolutionary Implications of Recruitment for Competitively Structured Communities

Cited by 5 publications

References 44 publications

A method for establishing bird conservation value at a landscape level

A method for establishing bird conservation value at a landscape level

Babel, or the ecological stability discussions: an inventory and analysis of terminology and a guide for avoiding confusion

The effect of predation by wintering cormorants Phalacrocorax carbo on grayling Thymallus thymallus and trout (Salmonidae) populations: two case studies from Swiss rivers. Comment

Contact Info

Product

Resources

About