Review Article |
Corresponding author: Paolo Casula ( pcasula@forestas.it ) Academic editor: Sonke Hardersen
© 2017 Paolo Casula.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Casula P (2017) Monitoring and management of Cerambyx cerdo in the Mediterranean region – a review and the potential role of citizen science. In: Campanaro A, Hardersen S, Sabbatini Peverieri G, Carpaneto GM (Eds) Monitoring of saproxylic beetles and other insects protected in the European Union. Nature Conservation 19: 97-110. https://doi.org/10.3897/natureconservation.19.12637
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The Great Capricorn beetle, Cerambyx cerdo, and Mediterranean oak habitats (Quercus ilex – 9340 and Quercus suber – 9330) are protected by the Habitats Directive (HD). However, in the Mediterranean basin, these habitats are also traditionally used for animal, wood, and cork productions. Cerambyx cerdo feeds into the wood of trees and can be perceived by forest practitioners as an umbrella species or as a pest, depending on the context. Monitoring programmes involving forest practitioners could thus focus on assessing: 1) the conservation status of the Great Capricorn beetle and habitats (distribution and abundance of insects and reproductive sites or colonised trees), 2) pest status, and 3) management options to achieve both conservational and economic benefits. Considering that Cerambyx cerdo and Cork and Holm oak forests are not priority species or habitats under the HD, targeted funding is likely to be limited for monitoring. In this context, citizen science could gather important information on the target species useful for the monitoring programmes and management. To address management questions, the citizen science based programme for Cerambyx cerdo monitoring and habitat conservation should be seen not only as citizens collecting good data sets, but also as a deeper collaboration amongst different knowledge bodies and perspectives within a community – based environmental monitoring and learning network.
Citizen Science, Habitats Directive, Monitoring protocol, Saproxylic beetle
The Great Capricorn beetle, Cerambyx cerdo, plays a key role in decomposition of wood and ecosystem functioning of natural and semi-natural oak forests (
Distribution map of Cerambyx cerdo based on data from the IUCN (background map from Stamen Design, OpenStreetMap).
Citizen science is the practice of engaging volunteers in a scientific project (
By applying this perspective, the following sections: 1) review management obligations for Cerambyx cerdo and oaks under the HD, 2) call for the application of a citizen science that can strengthen the link between C. cerdo monitoring and management, and 3) underline some relevant practitioner’s objectives of C. cerdo monitoring within adaptive management (
The Cerambyx cerdo is listed as a non priority species in annexes II and IV of the HD. That is, core areas of C. cerdo habitats are designated as Sites of Community Importance (SCIs) and included in the Natura 2000 network which must be managed to maintain or restore favourable conservation status of the species (
Obligations arising from the Habitats Directive for the conservation of animal species and habitats.
Article | Text (English version, only relevant parts) | Obligations |
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1 | e) The conservation status of a natural habitat will be taken as “favourable” when: - its natural range and areas it covers within that range are stable or increasing and - the specific structure and functions which are necessary for its long-term maintenance exist and are likely to continue to exist for the foreseeable future and - the conservation status of its typical species is favourable as defined in (i); i) The conservation status will be taken as “favourable” when: - population dynamics data on the species concerned indicate that it is maintaining itself on a long-term basis as a viable component of its natural habitats and - the natural range of the species is neither being reduced nor is likely to be reduced for the foreseeable future and - there is, and will probably continue to be, a sufficiently large habitat to maintain its populations on a long-term basis; |
Define favourable conservation status (FCS) for each listed species and habitat. |
2 | 1. The aim of this Directive shall be to contribute towards ensuring biodiversity through the conservation of natural habitats and of wild fauna and flora in the European territory of the Member States to which the Treaty applies. 2. Measures taken pursuant to this Directive shall be designed to maintain or restore, at favourable conservation status, natural habitats and species of wild fauna and flora of Community interest. 3. Measures taken pursuant to this Directive shall take account of economic, social and cultural requirements and regional and local characteristics. |
Take appropriate measures to maintain or restore species and habitats at FCS. Consider economic, social and cultural issues, and local context. |
3 | 1. A coherent European ecological network of special areas of conservation shall be set up under the title Natura 2000. This network, composed of sites hosting the natural habitat types listed in Annex I and habitats of the species listed in Annex II, shall enable the natural habitat types and the species’ habitats concerned to be maintained or, where appropriate, restored at a favourable conservation status in their natural range. | Identify a suitable Natura 2000 network for the conservation of habitats listed in annex I and species listed in annex II. |
6 | 1. For special areas of conservation, Member States shall establish the necessary conservation measures involving, if need be, appropriate management plans specifically designed for the sites or integrated into other development plans and appropriate statutory, administrative or contractual measures which correspond to the ecological requirements of the natural habitat types in Annex I and the species in Annex II present on the sites. | Develop conservation measures and, if necessary, appropriated management plans for species and habitats. |
10 | Member States shall endeavour, where they consider it necessary, in their land-use planning and development policies and, in particular, with a view to improving the ecological coherence of the Natura 2000 network, to encourage the management of features of the landscape which are of major importance for wild fauna and flora. Such features are those which, by virtue of their linear and continuous structure (such as rivers with their banks or the traditional systems for marking field boundaries) or their function as stepping stones (such as ponds or small woods), are essential for the migration, dispersal and genetic exchange of wild species. |
If necessary, develop plans and policies for the conservation of landscape features important for species. |
11 | Member States shall undertake surveillance of the conservation status of the natural habitats and species referred to in Article 2 with particular regard to priority natural habitat types and priority species. | Do monitoring, particularly on priority species or habitats. |
12 | 1. Member States shall take the requisite measures to establish a system of strict protection for the animal species listed in Annex IV (a) in their natural range, prohibiting: (a) all forms of deliberate capture or killing of specimens of these species in the wild; (b) deliberate disturbance of these species, particularly during the period of breeding, rearing, hibernation and migration; (c) deliberate destruction or taking of eggs from the wild; (d) deterioration or destruction of breeding sites or resting places. |
Take measures to strictly protect animal species listed in Annex IV. |
16 | 1. Provided that there is no satisfactory alternative and the derogation is not detrimental to the maintenance of the populations of the species concerned at a favourable conservation status in their natural range, Member States may derogate from the provisions of Articles 12 ... : a) in the interest of protecting wild fauna and flora and conserving natural habitats; b) to prevent serious damage, in particular to crops, livestock, forests, fisheries and water and other types of property. |
Ask derogations to protect habitats and avoid serious damage to forests, provided FCS of the species is maintained. |
Holm oak and Cork oak forests are protected habitats (HD, Annex I, habitats 9340 and 9330 respectively and habitat 6310 for dehesas with evergreen Quercus species). That is, core areas of habitats are designated as SCIs and included in the Natura 2000 network which must be managed to maintain habitats in favourable conservation status (
The long lasting association of C. cerdo with old and decaying trees (
In practice, forest management or conservation bodies face a mandatory task to monitor through space and time a long and incomplete list of species and habitats (
It has been shown several times that knowledge coming from non-professionals, either called citizen science (
In other words, citizen science programmes to assess distribution and abundance of C. cerdo and other saproxylics can certainly take advantage of involving many citizen scientists as data collectors (
Recent efforts in developing standard monitoring protocols for saproxylic beetles focused on applications of advanced statistical tools to address issues of insect detectability and to provide reliable estimates of distribution and abundance that can be compared across large spatial scales (
Main studies on biology, conservation, and management of Cerambyx cerdo in Europe.
Topic | Reference | Country | Main tree / Habitat type |
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Pest status | Martin et al. 2005 | Spain | Quercus suber / Woodland |
Microhabitat selection and spatial distribution |
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Germany | Quercus robur / Woodland pasture |
Role as ecosystem engineer |
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Germany | Quercus robur / Woodland pasture |
Microhabitat selection | Albert et al. 2012 | Czech Republic | Quercus robur / Woodland pasture |
Comparison of sampling methods for distribution and population monitoring |
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Slovenia | Unknown |
Microhabitat selection |
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France | Quercus ilex / Woodland |
Dispersal | Torres Vila et al. 2016 | Spain | Quercus ilex / Woodland pasture |
Microhabitat selection and exotic plants | Oleksa & Klejdysz 2017 | Poland | Quercus robur / Woodland pasture |
Information about the effect of different management histories on C. cerdo populations and habitat structure (e.g. number and quality of colonised trees) is very important as even the most reliable estimates of distribution and abundance of species cannot be translated into action if an explanation about the underlying process (e.g. why a trend is negative) is not available (
Scientific questions arising from the practitioner’s perspective may differ from those arising from professional scientists or amateur naturalists and these are more related to the need to understand which management decisions will result in societal benefits from the development and conservation perspectives. This is an open question in European oak woodlands dominated by Quercus species, where C. cerdo is considered by many forest practitioners as a serious pest (
Many thanks to Alessandro Campanaro and Lara Redolfi De Zan for their kind invitation to the MIPP workshop, Sergio Fantini for help with Figure
Special issue published with the contribution of the LIFE financial instrument of the European Union.