Spearhead blues: How threats to the damselfly Coenagrion hastulatum changed over time

Termaat, Tim; Ketelaar, Robert; van Kleef, Hein H.; Verberk, Wilco C. E. P.; van Grunsven, Roy H. A.; WallisDeVries, Michiel F.

doi:10.1007/s10841-023-00537-0

J Insect Conserv

2023

DOI: 10.1007/s10841-023-00537-0

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Spearhead blues: How threats to the damselfly Coenagrion hastulatum changed over time

Tim Termaat,

Robert Ketelaar,

Hein H. van Kleef

et al.

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2024

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Cited by 2 publications

References 26 publications

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Alcon Blues: recent shifts in limiting habitat factors challenge the persistence of an endangered butterfly

WallisDeVries,

Bokelaar,

Kok

et al. 2024

J Insect Conserv

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Insect habitat specialists have declined more than generalists over the last decades. Understanding how habitat requirements and increased climate variability interact to explain persistence of populations is needed to enable effective conservation measures. Habitat specialists with a complex life cycle, such as myrmecophilous butterflies, are likely to be most vulnerable. Here, we explored to what extent the habitat factors explaining population persistence of the Alcon blue (Phengaris alcon), changed over a 25-year period in the Netherlands, contrasting the recent years 2018–2022 with extreme droughts with the preceding period 1998–2017 characterized by occasional climatic extremes. Population persistence of P. alcon over 1998–2017 as explained by historical habitat conditions was significantly higher in large heathland areas with large patches of its host plant Gentiana pneumonanthe. On the basis of current conditions, population persistence until 2017 was best explained by a combination of host plant area and quality. In contrast, persistence over the recent drought years was most closely associated with increasing occupancy of the optimal host ant Myrmica ruginodis and lower occupancy of competitive and predatory Lasius ants.Implications for insect conservation We conclude that critical habitat conditions change under increasing climatic extremes and that the availability of sufficient optimal host ants has become more critical than that of host plants. The results emphasise that both large-scale hydrological restoration and small-scale management for heterogeneity are necessary to preserve P. alcon and its habitat in the Netherlands. This is also likely to apply to other habitat specialists with complex life cycles from threatened habitats.

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Alcon Blues: recent shifts in limiting habitat factors challenge the persistence of an endangered butterfly

WallisDeVries,

Bokelaar,

Kok

et al. 2024

J Insect Conserv

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Three new species for the odonatofauna of Piedmont (NW Italy)

Piretta,

Soldato,

Assandri

2024

Nat Hist Sci

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Between 2020 and 2023, three new species of Odonates were recorded in Piedmont (NW Italy). Lestes barbarus was observed at an artificial wetland in the Turin Plain in 2021. Even though at least one individual was fresh, we cannot conclude that the species developed at the site. Subsequent visits did not permit to confirm the species. Coenagrion hastulatum was discovered at a peat bog in the NW Alps (Lac Falin, Valle di Viù) in 2023 and here reproduction was confirmed. This population is the fifth to be recorded for the central and western Italian Alps. Trithemis annulata was first recorded in Piedmont in July 2020, and subsequently, the observations of the species in the region rapidly increased, with a total of 66 records relative to 29 sites up to the end of 2023. These are distributed in most of the low-altitude areas of the region. The species was reported mostly in late summer, with only one site where the early spring records suggest successful overwintering. However, this needs further confirmation. The odonate list of Piedmont now accounts for 70 species, representing 73.6% of the taxa reported for Italy, and this makes Piedmont, along with Lombardy, the most odonate-rich region of Italy.

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Spearhead blues: How threats to the damselfly Coenagrion hastulatum changed over time

Cited by 2 publications

References 26 publications

Alcon Blues: recent shifts in limiting habitat factors challenge the persistence of an endangered butterfly

Alcon Blues: recent shifts in limiting habitat factors challenge the persistence of an endangered butterfly

Three new species for the odonatofauna of Piedmont (NW Italy)

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