Predicting Spatial Distribution of Foragers over Large Resource Landscapes: A Modeling Analysis of the Ideal Free Distribution

Oikos ◽  
1997 ◽  
Vol 79 (2) ◽  
pp. 376 ◽  
Author(s):  
Jeffrey A. Tyler ◽  
William W. Hargrove
Keyword(s):  
Spatial Distribution ◽  
Ideal Free Distribution ◽  
Free Distribution ◽  
Modeling Analysis ◽  
Ideal Free ◽  
The Ideal

Movement Dynamics in a Fishery: Application of the Ideal Free Distribution to Spatial Allocation of Effort

1993 ◽  
Vol 50 (2) ◽  
pp. 323-333 ◽  
Author(s):  
Darren M. Gillis ◽  
Randall M. Peterman ◽  
Albert V. Tyler
Keyword(s):  
Spatial Distribution ◽  
Ideal Free Distribution ◽  
Fishing Effort ◽  
Catch Per Unit Effort ◽  
Exploitation Competition ◽  
Spatial Allocation ◽  
Free Distribution ◽  
Fishing Vessels ◽  
Ideal Free ◽  
The Ideal

Many traditional analyses of fisheries data assume that there is a negligible effect of alternative fish stocks on the spatial distribution of fishing effort and that the amount of local effort does not influence catchability. There is growing evidence that contradicts these assumptions. Because of the potential biases that these erroneous assumptions may cause in the interpretation of catch-per-unit-effort (CPUE) statistics, it is important to determine the factors governing the spatial distribution of effort in a fishery. We used data on the Hecate Strait, British Columbia, Canada, trawl fishery to test hypotheses about spatial allocation of effort and interaction among fishing vessels. The ideal free distribution of Fretwell and Lucas (1970. Acta Biotheor. 19: 16–36) was the foundation for deriving these tests. We found evidence for competition among vessels, although we could not distinguish whether the mechanism was interference or exploitation competition. As well, CPUE was generally equalized among the areas fished, as predicted by the ideal free distribution, because of movement of boats among areas. Thus, area-specific CPUE would not be a reliable index of relative abundance of fish in different areas; relative fishing effort may be better.

Spatial distribution of catch and effort in a fishery for snow crab (Chionoecetes opilio): tests of predictions of the ideal free distribution

2003 ◽  
Vol 60 (8) ◽  
pp. 897-909 ◽  
Author(s):  
Douglas P Swain ◽  
Elmer J Wade
Keyword(s):  
Spatial Distribution ◽  
Resource Distribution ◽  
Ideal Free Distribution ◽  
Snow Crab ◽  
Catch Per Unit Effort ◽  
Chionoecetes Opilio ◽  
Free Distribution ◽  
Crab Abundance ◽  
Ideal Free ◽  
The Ideal

The ideal free distribution (IFD), a hypothesis from behavioural ecology, predicts that fishery effort should map resource distribution better than catch-per-unit-effort (CPUE) when interference competition occurs in the fishery. We tested this prediction using data from the fishery and annual research survey for snow crab (Chionoecetes opilio) in the southern Gulf of St. Lawrence. Effort was positively correlated with the local abundance of crabs in all years. Correlations between CPUE and local crab abundance were also positive in some years, but negative in others. In the latter cases, CPUE and effort were also negatively correlated, suggesting intense competition in the fishery. In most years, CPUE tended to be equalized among areas compared with the distributions of effort and local crab abundance, as predicted by the IFD. In most years, differences in spatial distribution were more significant between CPUE and crab abundance than between effort and crab abundance. Although effort was the more reliable indicator of resource distribution, even it provided a distorted view of this distribution, as predicted given expected violations of IFD assumptions. For example, effort tended to be higher than expected on fishing grounds near home ports and lower than expected on distant grounds.

Foraging behaviour in tadpoles of the bronze frogRana temporalis: Experimental evidence for the ideal free distribution

2004 ◽  
Vol 29 (2) ◽  
pp. 201-207 ◽  
Author(s):  
Dheeraj K. Veeranagoudar ◽  
Bhagyashri A. Shanbhag ◽  
Srinivas K. Saidapur
Keyword(s):  
Experimental Evidence ◽  
Foraging Behaviour ◽  
Ideal Free Distribution ◽  
Free Distribution ◽  
Ideal Free ◽  
The Ideal

Aggregation and the `Ideal Free' Distribution

10.2307/4456 ◽  
1983 ◽  
Vol 52 (3) ◽  
pp. 821 ◽  
Author(s):  
William J. Sutherland
Keyword(s):  
Ideal Free Distribution ◽  
Free Distribution ◽  
Ideal Free ◽  
The Ideal

scholarly journals Modeling Incipient Use of Neolithic Cultigens by Taiwanese Foragers: Perspectives from Niche Variation Theory, the Prey Choice Model, and the Ideal Free Distribution

Quaternary ◽  
2020 ◽  
Vol 3 (3) ◽  
pp. 26
Author(s):  
Pei-Lin Yu
Keyword(s):  
Choice Model ◽  
Ideal Free Distribution ◽  
Variation Theory ◽  
Prey Choice ◽  
Encounter Rates ◽  
Free Distribution ◽  
Niche Variation ◽  
Native Populations ◽  
Ideal Free ◽  
The Ideal

The earliest evidence for agriculture in Taiwan dates to about 6000 years BP and indicates that farmer-gardeners from Southeast China migrated across the Taiwan Strait. However, little is known about the adaptive interactions between Taiwanese foragers and Neolithic Chinese farmers during the transition. This paper considers theoretical expectations from human behavioral ecology based models and macroecological patterning from Binford’s hunter-gatherer database to scope the range of responses of native populations to invasive dispersal. Niche variation theory and invasion theory predict that the foraging niche breadths will narrow for native populations and morphologically similar dispersing populations. The encounter contingent prey choice model indicates that groups under resource depression from depleted high-ranked resources will increasingly take low-ranked resources upon encounter. The ideal free distribution with Allee effects categorizes settlement into highly ranked habitats selected on the basis of encounter rates with preferred prey, with niche construction potentially contributing to an upswing in some highly ranked prey species. In coastal plain habitats preferred by farming immigrants, interactions and competition either reduced encounter rates with high ranked prey or were offset by benefits to habitat from the creation of a mosaic of succession ecozones by cultivation. Aquatic-focused foragers were eventually constrained to broaden subsistence by increasing the harvest of low ranked resources, then mobility-compatible Neolithic cultigens were added as a niche-broadening tactic. In locations less suitable for farming, fishing and hunting continued as primary foraging tactics for centuries after Neolithic arrivals. The paper concludes with a set of evidence-based archaeological expectations derived from these models.

Sign in / Sign up

Export Citation Format

Share Document