Nature conservation in the Czech Republic faces the challenge of effectively monitoring the status of habitats and evaluating the success of conservation measures. Beetles have become one of the key groups of organisms for assessing the quality and conservation of natural habitats due to their species diversity, specific environmental requirements and relatively well-studied nature. In conservation practice, three basic concepts are used in relation to insects to help target conservation measures effectively: flagship species, umbrella species and bioindicator species.

Characteristics of the different concepts used in habitat conservation:

 Flagship species as conservation symbols

Flagship species have a primarily communicative function in nature conservation. They are charismatic organisms that can win public and political support for the protection of entire habitats. Flagship species are primarily defined by their importance to the public. These are species that are conspicuous, aesthetically appealing or widely known. Their main function is to serve as a symbol of the conservation of a particular environment and to draw attention to broader ecological issues. A flagship species is not necessarily the most sensitive indicator of environmental quality, but its popularity enables it to raise funds and social support for the conservation of the entire habitat in which it lives. Its function is therefore not primarily ecological, but helps in communicating with the public, politicians and funders.

Examples from the Czech Republic

• Rosalia alpina
• Lucanus cervus
• Osmoderma barnabita

The flagship species may or may not also be an umbrella species.

 Umbrella species and its ecological shade

Umbrella species are organisms with such extensive environmental requirements that their protection automatically ensures the protection of a range of other species sharing the same habitat. An umbrella species differs from a flagship species in that its selection is based on biological parameters, not public sympathy.

Its protection automatically protects many other species because it requires:

• high demands on habitat quality and extent,
• specific and stable ecological conditions (e.g. old hollow trees, dead wood),
• long-term continuity of the habitat.

It is used as a practical conservation tool - instead of protecting hundreds of species, one "umbrella" species is protected.

Why umbrella species are used in nature conservation

• thousands of species cannot be protected individually,
• umbrella species are well defined and often protected by law,
• are indicators of long-term stable ecosystems (e.g. forests with deadwood continuity).

Examples of umbrella beetle species in the Czech Republic

For beetles, the term umbrella species is most often used in relation to old forests, hollow trees and dead wood (saproxylic species).

1. Osmoderma barnabita

• typical model umbrella species in the Czech Republic,
• larval development in cavities of old deciduous trees (oak, lime, ash),
• protected by European legislation (Natura 2000).

Umbrella importance:
Protection of the stink bug = protection of entire populations of saproxylic insects in tree cavities (tens to hundreds of species).

2. Rosalia alpina

• bound to old beech stands with dead wood,
• requires sunny, uncleared trunks.

Umbrella importance:
Protects light beech forests with natural structure and deadwood continuity.

3. Eurythyrea quercus

• development in thick, dying oak trunks,
• extremely sensitive to management interventions.

Umbrella importance:
Indicator of relict oak woodland - its presence indicates high biological value of the site.

4. Cerambyx cerdo

• larvae develop for several years in living and dying oaks,
• needs old, solitary trees.

Umbrella importance:
Conservation of old oaks in the landscape - including parks, avenues and grazing woodlands.

5. Forest relict beetles (species group)

This is not a single species, but a collection of about 150-170 species of beetles, e.g.:

• Cucujus cinnaberinus,
• Pytho abieticola,
• Boros schneideri,
• Limoniscus violaceus.

These species are referred to as "forest relicts".

Umbrella importance:
They are used collectively as umbrella species for conservation:

• rainforests,
• long-term continuity of dead wood.

 Bioindicator species and monitoring systems

Bioindicator species are organisms whose presence or absence is indicative of specific environmental characteristics. Among the beetles there are several groups with high bioindication value for different types of habitats in the Czech Republic. A good bioindicator must have a well-described distribution and life requirements, be easily determinable and sensitive to anthropogenic pressure. In the Czech Republic, the bioindication system is based on long-term monitoring provided by the Agency for Nature Conservation and Landscape Protection (AOPK ČR) in cooperation with universities and scientific institutes.

Bioindication can take place at the level of individual species or entire communities. Community analysis allows the use of statistical methods such as diversity indices that quantify the balance in the ecosystem. Beetles are an ideal group for these purposes, as they include species tied to almost all types of microhabitats in the landscape.

The Carabidae are one of the most important and widely used groups in bioindication of terrestrial habitats. Approximately 500 species of this family occur in the Czech Republic, most of them living and moving on the surface of the soil in the so-called epigeon. Their advantage for monitoring is the ease of capture using a standardised method of ground trapping, which allows obtaining comparable data from different locations and time periods.

In particular, voles are very sensitive to moisture conditions, temperature and the degree of disturbance of the soil surface. They can be divided into several groups according to their requirements. Only about 17.7% of our fauna are ubiquitous species, which are also found in habitats that are heavily influenced by humans, such as fields or ruderal areas.

The Staphylinidae are the most species-rich family of beetles in the Czech Republic and worldwide. Although they are often overlooked due to their small size and challenging determination, their importance in bioindication is crucial, especially for the assessment of the quality of forest environments and soil humus. Voles are sensitive indicators of changes in microclimate in the ground layer of vegetation and in the fallout.

Rattlesnakes are probably more sensitive to forest regeneration than are silkworms. While some swifts can adapt to younger plantings, the specialist rattlesnakes require a stable environment with a well-developed litter layer that has not been disturbed by heavy mechanisation. Their occurrence in forest fragments thus indicates the preservation of the internal forest microclimate, which is crucial for maintaining soil moisture and biological activity.

Curculionoidea represent a group of approximately 1000 species in the Czech Republic, which are almost exclusively phytophagous (herbivorous). Their indicative value is different from that of the bryophytes - while bryophytes indicate mainly the physical characteristics of the environment and soil structure, weevils are closely related to the species composition of the vegetation. Many weevils are monophagous (tied to a single plant species) or oligophagous (tied to a narrow range of related plants). In the Czech Republic, weevils are mainly used for the assessment of grassland communities, where different species indicate extensive farming, non-fertilisation and regular mowing. The composition of the grassland weevil community can also reveal long-term changes in management practices.

The threat to weevils in the Czech landscape is directly proportional to the threat to their host plants and specific habitats. Research shows that the highest threat levels are for species tied to xerothermic (dry-loving) grasslands and wetland habitats. Weevils living on herbaceous open habitats are much more vulnerable than species tied to woody plants. This indicates the critical state of our non-forest landscapes, which are suffering either from intensive management or, conversely, from the complete abandonment of traditional grazing.

The disappearance of traditional pastures leads to overgrowth (succession) and the subsequent disappearance of the plant populations to which the weevils are tied. For example, if a population of a particular species of goatgrass or mullein disappears, the weevils attached to it will inevitably disappear too. Therefore, these beetles are excellent indicators of the long-term continuity and quality of non-forest habitats. Moreover, their limited flight ability in many species means that they are unable to recolonise isolated remnants of habitat in highly fragmented landscapes.

Aquatic beetles represent a distinct bioindicator group for assessing the quality of aquatic ecosystems. In the Czech Republic, mainly dive beetles (Dytiscidae) and water beetles (Hydrophilidae) are monitored. Each species has specific requirements for water quality, flow velocity, presence of aquatic vegetation and connectivity with the surrounding landscape.

Aquatic beetles include representatives from 18 different families, such as Dytiscidae, Hydrophilidae, Gyrinidae and Elmidae. More than 400 species of water beetles have been described in the Czech Republic, inhabiting a wide range of habitats from vernal pools and peat bogs to large lowland rivers and ponds. As bioindicators, they provide information on water chemical purity, oxygen content, as well as the physical structure of riverbeds and banks.

Saproxylic beetles are species that are attached at some stage in their lives to dead wood from standing or fallen trees, to wood-destroying fungi or to other organisms living in this environment. This group is currently one of the most studied and most important bioindicators of the conservation of forest ecosystems. Saproxylic beetles require continuity in the availability of dead wood of different dimensions, tree species and stages of decomposition. Their communities vary in treeless forest stands, in managed forests with retained wood mass, and in avenues and orchards.

One of the most important subgroups are the so-called forest relicts. These are species that are strictly confined to habitats with no interruption in forest continuity, where large amounts of dead wood of large dimensions are present for long periods of time. Saproxylic species indicate not only the quantity of wood but also its quality and the diversity of microhabitats. Particularly important are:

• Veteran trees: Massive trees over 70 cm in diameter that host cavities, decay and fungal fruiting bodies.
• Dead wood in various stages of decay: From freshly fallen trunks to nearly decomposed substrate.
• Exposure to sunlight: Sun exposure is a key factor that increases saproxylic insect diversity by more than 50% compared to shaded stands.

Conservation of the above mentioned bioindicator groups requires a systematic approach in the Czech Republic, combining legislative tools with practical management in the field. A key player is the Nature Conservation Agency of the Czech Republic (AOPK ČR), which monitors the status of European sites of European importance (ESI) and species. To ensure a consistent approach to monitoring, the AOPK CR develops certified methodologies. These methodologies define standardised methods of data collection.

Beetles as a bioindicator group represent a sensitive tool for assessing the state of our nature. While the armyworms and dung beetles tell us about the quality of soil and forest humus, the weevils reflect botanical diversity and the history of landscape management. Aquatic beetles are key to monitoring water clarity and saproxylic specialists are relentless indicators of the condition of our forests and the availability of dead wood.

The combination of all three of the above concepts then enables effective habitat conservation in the Czech Republic. Understanding the role of flag and umbrella species allows for more effective communication of conservation needs to the public and policy makers. Flagship species, such as the common hornbill, gain support for conservation projects, umbrella species, such as the brown stinkhorn, provide comprehensive protection for entire communities, and bioindicator groups allow the effectiveness of conservation measures to be monitored over time. Consistent use of bioindication in landscape management decisions is one way to preserve the richness of our entomofauna for future generations. Beetles are not just passive inhabitants of habitats, they are active indicators of their health and stability that we should learn to better perceive and protect.