Large-scale grid-based detection in occupancy surveys of a threatened small mammal: A comparison of two non-invasive methods

Oliveira, A. Carvalho Antunes De; Medinas, Denis; Craveiro, João; Milhinhas, Catarina; Sabino-Marques, Helena; Mendes, Tiago; Spadoni, Giulia; Oliveira, André Soares de; Sousa, Luís Guilherme; Tapisso, Joaquim T.; Santos, Sara; Lopes-Fernandes, Margarida; Mathias, Maria da Luz; Pita, Ricardo

doi:10.1016/j.jnc.2023.126362

Journal for Nature Conservation

2023

DOI: 10.1016/j.jnc.2023.126362

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Large-scale grid-based detection in occupancy surveys of a threatened small mammal: A comparison of two non-invasive methods

A. Carvalho Antunes De Oliveira

Denis Medinas

João Craveiro

et al.

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2024

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Trends in abundance and occupancy of the protected water beetle Graphoderus bilineatus in the Netherlands

van Strien,

Koese,

Stienstra

et al. 2024

J Insect Conserv

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The European Habitats Directive prescribes Member States to report on trends in abundance and distribution of protected species. One of these species is Graphoderus bilineatus (De Geer, 1774), a middle-sized predaceous aquatic beetle, listed in Annex II and IV of the Habitats Directive. In the Netherlands, a monitoring scheme for this species has been set up to assess the national trend as well as the trend in the national Natura2000 sites. In this scheme, a selection of 1 km2 squares is surveyed in cycles of six years using a standardized field method by professional fieldworkers. In each selected square, five locations were sampled per annum (September–October) by two different observers using hand netting. The data of the first two rounds (2011–2016 and 2017–2022) have been analysed using both an occupancy model and a Poisson GLMM. We found evidence of a declining trend in occupancy as well as in population size. The decreases were stronger outside than within Natura2000 sites and also stronger than those of three other beetle species that are often found together with G. bilineatus. In addition, considerable differences between observers were detected in the data, despite the application of a standardized field method. Implications for insect conservation Graphoderus bilineatus is declining and the decline is stronger outside Natura2000 sites then within, most likely due to differences in the development of water quality, vegetation structure and water management. Further research is required to identify the exact causes of the decline; however water quality improvement seems essential to turn the tide. The study also shows the benefits of a monitoring scheme for trend assessments. The recent decline would probably not have been noticed based on distribution data alone.

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Trends in abundance and occupancy of the protected water beetle Graphoderus bilineatus in the Netherlands

van Strien,

Koese,

Stienstra

et al. 2024

J Insect Conserv

View full text Add to dashboard Cite

show abstract

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Large-scale grid-based detection in occupancy surveys of a threatened small mammal: A comparison of two non-invasive methods

Cited by 1 publication

References 53 publications

Trends in abundance and occupancy of the protected water beetle Graphoderus bilineatus in the Netherlands

Trends in abundance and occupancy of the protected water beetle Graphoderus bilineatus in the Netherlands

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