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Investigating the current occupancy of the endangered butterfly Parnassius apollo and the abundance of its host plant Sedum telephium in the Archipelago Sea

Kukkonen, Jonna (2021-04-06)

Investigating the current occupancy of the endangered butterfly Parnassius apollo and the abundance of its host plant Sedum telephium in the Archipelago Sea

Kukkonen, Jonna
(06.04.2021)
Katso/Avaa
Jonna_Kukkonen_mastersthesis.pdf (906.8Kb)
Lataukset: 

Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021051930683
Tiivistelmä
Insect populations across the globe are declining and the biodiversity of insects is threatened.
To deal with the threats, conservation biology aims to identify species that are most vulnerable
to extinction, and also to understand mechanisms that make some species more prone than
others to population decline, range contraction and extinction. For the extinction risk
assessments it is crucial to study and monitor the possible changes in the numbers and ranges
of species. Furthermore, it is important to examine the drivers of declines. This knowledge
sheds light to the nature of extinction processes and enables conservation management
planning, as the most threatened species often require specific management and conservation
measures. Out of all insect groups declining worldwide, butterflies (Lepidoptera) are among the
taxa most affected. In Finland butterflies are considered as one of the most endangered
organism groups. Among the endangered butterfly species is the Apollo butterfly (Parnassius
apollo), which has declined in numbers throughout the species range since the 1970s. Two
decades ago the Apollo and its sole host plant orpine (Sedum telephium) was studied in one of
its few strongholds in southwest Finland in the Archipelago Sea. The host plant was found to be
the most important factor affecting the occupancy of the Apollo larvae. Today the species and
the study area are included in CoastNet LIFE project that plans to implement restoration work of
habitat for the Apollo butterfly. For successful restoration work, it is important to update the data
on the Apollo and its host plant. In this thesis I study the possible occupancy changes of the
Apollo larvae and possible changes in their host plant abundance by comparing historical data
from survey years 1997, 1999-2003 to the data I collected in the same study area in 2019. I also
explore if abundance of S. telephium affects the occupancy of P. apollo larvae. To examine the
probable change in the larvae occurrence I compared naïve occupancy estimations and
occupancy model estimates between data sets of historical years and the year 2019. In the
historical data the number of S. telephium plants per site were scored in categories: 1 (1-10
plants), 2 (10-100 plants), 3 (100-1000 plants) or 4 (> 1000 plants). I used these same
categories to study the possible change in the abundance of S. telephium in the comparison
between earlier survey years and the year 2019. I found a very strong decline in the occupancy
of the larvae and no apparent difference in the abundance of their host plant between the
historical data and the data I collected 2019. However, there were difference between survey
sites. The Apollo larvae were mainly detected on sites with average amount of the host plant
(10-100 plants) instead of sites with high abundance of the host plant. This finding is
unexpected as it suggests that the abundance of the host plant is not as important as was
predicted based on previous studies. In addition, I did tentative grouping of survey sites with kmeans
cluster analysis. I included the island groups (0-3) to top occupancy model and the
analyze showed a clear difference between the groups. This difference between island groups
indicates the importance of the spatial location to the probability of occupancy of the Apollo
larvae. In light of these results, it is critical to continue monitoring the endangered Apollo larvae
in order to understand if the decline is merely a temporary change or a signal of a possible
trend. Additionally, for successful conservation management it is important to research the
drivers affecting the population decline.
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