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Effects of flower abundance and colour on pan-trap catches
Linköpings universitet, Institutionen för fysik, kemi och biologi.
2016 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 40 poäng / 60 hpOppgave
Abstract [sv]

Pollinating insects are important for many plants and for the human population. To be able to monitor pollinators and assess improvements made for them, it is important to get information about pollinator population changes. Therefore, it is essential that the methods used to collect data are accurate (i.e. that they represent the pollinator fauna). One commonly used method is pan-traps, but this method is suggested to be affected by the abundance of surrounding flowers. The results in the present study showed that catches in pan-traps can be affected by flower cover and the colour of the flowers, depending on which colours are preferred by the insects. The effects differed when looking at a larger scale (2-6 ha) and a smaller scale (25 m2) around the pan-traps. When comparing cover of flowers with catches in pan-traps in the small scale there were some results that showed linear positive correlations (expected), but also, negative linear and quadratic correlations. In contrast, in the large scale there were no significant positive linear correlations. When comparing catches in hand-net and pan-traps, only in one out of six taxonomical groups there were a correlation. The results in this study show that catches in pan-traps can be misleading if catches are done to survey pollinator population fauna and the cover of flowers is not considered.

sted, utgiver, år, opplag, sider
2016. , s. 28
Emneord [en]
Syrphidae, Apoidea, Bombus, Cetoniidae, Lepturinae, Trichius, pan-trap, hand-netting, flower colour
Emneord [sv]
Blomflugor, bin, humlor, guldbaggar, blombockar, humlebaggar, färgskålar, håvning, blomfärger
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-133077ISRN: LITH-IFM-A-EX—16/3217--SEOAI: oai:DiVA.org:liu-133077DiVA, id: diva2:1054677
Fag / kurs
Biology
Presentation
2016-05-27, E324 Schrödinger, Linköpings universitet 581 83, Linköping, 09:40 (engelsk)
Veileder
Examiner
Tilgjengelig fra: 2017-02-03 Laget: 2016-12-08 Sist oppdatert: 2017-02-03bibliografisk kontrollert

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