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Trend detection in source-sink systems: when should sink habitats be monitored?

Jonzén, Niclas LU ; Rhodes, J R and Possingham, H P (2005) In Ecological Applications 15(1). p.326-334
Abstract
We determine the power of population monitoring in source or sink habitat to detect declining reproductive success in source habitat using a stochastic population model. The relative power to detect a trend in the source by monitoring either the source or the sink Varies with life history parameters, environmental stochasticity, and observation uncertainty. The power to detect a decline monitoring either source or sink habitat is maximized when the reproductive surplus in the source is low. The power to detect a decline by monitoring the sink increases with increasing reproductive deficit in the sink. If environmental stochasticity in the source increases, the power in the sink goes down due to a lower signal-to-noise ratio. However, the... (More)
We determine the power of population monitoring in source or sink habitat to detect declining reproductive success in source habitat using a stochastic population model. The relative power to detect a trend in the source by monitoring either the source or the sink Varies with life history parameters, environmental stochasticity, and observation uncertainty. The power to detect a decline monitoring either source or sink habitat is maximized when the reproductive surplus in the source is low. The power to detect a decline by monitoring the sink increases with increasing reproductive deficit in the sink. If environmental stochasticity in the source increases, the power in the sink goes down due to a lower signal-to-noise ratio. However, the power in the sink increases if environmental stochasticity is increased further, because increasing stochasticity reduces the geometric mean growth rate in the source. Intriguingly, it is often most efficient to monitor the sink even though the actual reproductive decline occurs in the source. If reproductive success is declining in both habitats, censusing the sink will always have higher power. However, the probability of Type 1 error is always higher in the sink. Our results clearly have implications for optimal population monitoring in source-sink landscapes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ecological Applications
volume
15
issue
1
pages
326 - 334
publisher
Ecological Society of America
external identifiers
  • wos:000227120700026
  • scopus:13944269243
ISSN
1051-0761
DOI
10.1890/03-5168
language
English
LU publication?
yes
id
6723ea0a-d22c-49fb-841d-6e1a4f6b1a09 (old id 147417)
date added to LUP
2007-07-03 12:24:59
date last changed
2017-01-01 07:27:57
@article{6723ea0a-d22c-49fb-841d-6e1a4f6b1a09,
  abstract     = {We determine the power of population monitoring in source or sink habitat to detect declining reproductive success in source habitat using a stochastic population model. The relative power to detect a trend in the source by monitoring either the source or the sink Varies with life history parameters, environmental stochasticity, and observation uncertainty. The power to detect a decline monitoring either source or sink habitat is maximized when the reproductive surplus in the source is low. The power to detect a decline by monitoring the sink increases with increasing reproductive deficit in the sink. If environmental stochasticity in the source increases, the power in the sink goes down due to a lower signal-to-noise ratio. However, the power in the sink increases if environmental stochasticity is increased further, because increasing stochasticity reduces the geometric mean growth rate in the source. Intriguingly, it is often most efficient to monitor the sink even though the actual reproductive decline occurs in the source. If reproductive success is declining in both habitats, censusing the sink will always have higher power. However, the probability of Type 1 error is always higher in the sink. Our results clearly have implications for optimal population monitoring in source-sink landscapes.},
  author       = {Jonzén, Niclas and Rhodes, J R and Possingham, H P},
  issn         = {1051-0761},
  language     = {eng},
  number       = {1},
  pages        = {326--334},
  publisher    = {Ecological Society of America},
  series       = {Ecological Applications},
  title        = {Trend detection in source-sink systems: when should sink habitats be monitored?},
  url          = {http://dx.doi.org/10.1890/03-5168},
  volume       = {15},
  year         = {2005},
}