Discuss the ecological and economic significance of dung beetles as ecosystem service providers. How does urbanization alter the resource base and reproductive success of such decomposer species?

Dung beetles (family Scarabaeidae) are keystone decomposers that bury mammalian faeces and convert a waste product into soil fertility. Their services are simultaneously ecological and monetisable, yet urbanisation is quietly rewriting both the dung they feed on and their breeding success.

Ecological significance

• Nutrient cycling: burial of dung returns nitrogen, phosphorus and potassium to the soil and improves soil structure, pH and water infiltration; without beetles, decomposition slows sharply [1].
• Sanitation and pest control: rapid dung removal suppresses flies and livestock gastrointestinal parasites, reducing disease pressure in pastures [1].
• Secondary seed dispersal: seeds buried along with dung escape predation and germinate better, measurably raising plant growth [1].
• Bioindicators: being sensitive to land-use change and chemicals, they signal habitat health — a global decline over the last three decades is documented [1].

Economic significance

• Their services are valued at roughly $5.9 billion annually in the United States and about $425.9 million in the United Kingdom, largely through avoided veterinary costs and sustained pasture productivity [2].
• For livestock-dependent economies like India, this natural recycling substitutes for chemical fertiliser and manual dung clearance — a free input to smallholder agriculture.

Urbanisation and the altered resource base

• Cities replace herbivore dung with omnivore/pet waste, while soil sealing and habitat fragmentation restrict tunnelling; urban gradients measurably restructure dung beetle taxonomic and functional diversity [4].

Impact on reproductive success

• A 2026 study of the urban tunneler Onthophagus orpheus found beetles strongly preferred dog dung, with faster-developing, larger offspring — yet brood-ball failure reached nearly 60% on dog dung against about 25% on cow dung [3].
• This preference–performance mismatch is an evolutionary trap: the most attractive resource is the least reproductively viable.

Dung beetles thus illustrate how an inconspicuous species underpins soil health, public sanitation and farm incomes. Integrating pet-waste management and insect-friendly green spaces into urban sanitation planning would protect these services, advancing SDG-15 (Life on Land) alongside cleaner cities.