API

Relationship: 428

Title

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Increased Mortality leads to Decreased, Population trajectory

Upstream event

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Increased Mortality

Downstream event

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Decreased, Population trajectory

Key Event Relationship Overview

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AOPs Referencing Relationship

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Taxonomic Applicability

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Sex Applicability

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Sex Evidence
Unspecific High

Life Stage Applicability

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Term Evidence
All life stages High

Key Event Relationship Description

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  • Increased mortality in the reproductive population may lead to a declining population.

Evidence Supporting this KER

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Biological Plausibility

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  • Survival to reproductive maturity is a parameter of demographic significance. Assuming resource availability (i.e., food, habitat, etc.) is not limiting to the extant population, sufficient mortality in the reproductive population may ultimately lead to declining population trajectories.

Empirical Evidence

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n/a

Uncertainties and Inconsistencies

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  • There are scenarios in which individual mortality may not lead to declining population size. These include instances where populations are limited by the availability of habitat and food resources, which can be replenished through immigration.

  • The direct impact of pesticides on migration behavior can be difficult to track in the field, and documentation of mortality during migration is likely underestimated (Eng 2017).

Quantitative Understanding of the Linkage

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  • Assuming other relevant demographic parameters are available, the effect of increased mortality rates on population status can be quantitatively predicted using standard population modeling approaches.

Response-response Relationship

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Time-scale

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Known modulating factors

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Known Feedforward/Feedback loops influencing this KER

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Domain of Applicability

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  • All organisms must survive to reproductive age in order to reproduce and sustain populations.

References

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  • Eng, M.L., Stutchbury, B.J.M. & Morrissey, C.A. Imidacloprid and chlorpyrifos insecticides impair migratory ability in a seed-eating songbird. Sci Rep 7, 15176 (2017)