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Reliability of noninvasive genetic census of otters compared to field censuses
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Zooekologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Evolutionsbiologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Zooekologi.
2007 (Engelska)Ingår i: Conservation Genetics, ISSN 1566-0621, E-ISSN 1572-9737, Vol. 8, nr 5, s. 1097-1107Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Conservation and management actions are often highly dependent on accurate estimations of population sizes. However, these estimates are difficult to obtain for elusive and rare species. We compared two census methods for Eurasian otter: snow tracking and noninvasive genetic census based on the genotyping of faecal samples. With the noninvasive genetic census we detected the presence of almost twice as many otters as with snow tracking (23 and 10–15, respectively), and mark-recapture estimates based on the genetic census indicated that the real number of otters could be even higher. Our results indicate that snow tracking tends to underestimate the number of individuals and also that it is more susceptible to subjective assessment. We compared the strengths and weaknesses of the two methods.

Ort, förlag, år, upplaga, sidor
2007. Vol. 8, nr 5, s. 1097-1107
Nyckelord [en]
Individual identification, Faeces, Monitoring, Population size, Snow tracking
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
URN: urn:nbn:se:uu:diva-95532DOI: 10.1007/s10592-006-9266-yISI: 000248850700009OAI: oai:DiVA.org:uu-95532DiVA, id: diva2:169787
Tillgänglig från: 2007-03-02 Skapad: 2007-03-02 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
Ingår i avhandling
1. Conservation Genetics of the Eurasian Otter in Sweden
Öppna denna publikation i ny flik eller fönster >>Conservation Genetics of the Eurasian Otter in Sweden
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In this thesis, molecular genetic methods were used to study a threatened species, the Eurasian otter. Estimates of population size and population dynamics parameters were obtained, the genetic effects of a restocking program was evaluated, and a population viability analysis was conducted to assess which demographic parameters are most important for the future viability of an otter population. Many of the studies were based on noninvasive genetic sampling of faeces.

In the genetic evaluation of the restocking program, it was found that the released otters had contributed to subsequent generations. However, the effects were to a large degree limited to the near surroundings of the release areas.

Comparison of two census methods, snow-tracking and noninvasive genetic census based on faeces, showed that approximately only half of the otters detected with the genetic census were found with the snow-tracking census. It is recommended to combine these two methods to obtain the most reliable estimates of population size.

A short-term study on population dynamics in otters showed that apparent survival was higher in females than in males and that the rate of addition was also high and likely influenced by migration.

The population viability analysis incorporated both genetics and demography and revealed that survival to first reproduction was the most crucial demographic parameter affecting the viability of the study population. This result suggests that conservation efforts should be focused on protocols that enhance the survival prospects of young females. Environmental stochasticity was also found to have large effects on the probability of extinction of this population.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2007. s. 60
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 278
Nyckelord
Ecology, in situ conservation, individual identification, microsatellites, mtDNA, noninvasive genetic sampling, population dynamics, population size, PVA, restocking, Ekologi, Lutra lutra
Identifikatorer
urn:nbn:se:uu:diva-7633 (URN)978-91-554-6816-3 (ISBN)
Disputation
2007-03-23, Zootissalen, F d zoologiska institutionen, Villavägen 9, Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2007-03-02 Skapad: 2007-03-02 Senast uppdaterad: 2009-03-31Bibliografiskt granskad

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Vilà, CarlesBjörklund, Mats

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