Book contents
- Frontmatter
- Contents
- List of contributors
- Foreword
- Preface
- Acknowledgements
- List of abbreviations
- 1 Introduction
- PART I FACTORS DRIVING CHANGES IN WILDLIFE
- PART II CONSERVATION IN ACTION
- PART III THE CASE HISTORIES
- 15 Mammals in the twentieth century
- 16 Bats
- 17 State of bird populations in Britain and Ireland
- 18 The conservation of the Grey Partridge
- 19 Reptiles
- 20 Amphibians
- 21 Freshwater fishes: a declining resource
- 22 Riverflies
- 23 Bumblebees
- 24 Butterflies
- 25 Moths
- 26 Dragonflies (Odonata) in Britain and Ireland
- 27 Flies, beetles and bees, wasps and ants (Diptera, Coleoptera and aculeate Hymenoptera)
- 28 Hemiptera
- 29 Grasshoppers, crickets and allied insects
- 30 Aerial insect biomass: trends from long-term monitoring
- 31 Other invertebrates
- 32 Land and freshwater molluscs
- 33 The seashore
- 34 The offshore waters
- 35 Plants
- 36 Conclusion: what is the likely future for the wildlife in Britain and Ireland?
- Glossary
- Name index
- Subject index
- Plate section
- References
30 - Aerial insect biomass: trends from long-term monitoring
Published online by Cambridge University Press: 05 August 2012
- Frontmatter
- Contents
- List of contributors
- Foreword
- Preface
- Acknowledgements
- List of abbreviations
- 1 Introduction
- PART I FACTORS DRIVING CHANGES IN WILDLIFE
- PART II CONSERVATION IN ACTION
- PART III THE CASE HISTORIES
- 15 Mammals in the twentieth century
- 16 Bats
- 17 State of bird populations in Britain and Ireland
- 18 The conservation of the Grey Partridge
- 19 Reptiles
- 20 Amphibians
- 21 Freshwater fishes: a declining resource
- 22 Riverflies
- 23 Bumblebees
- 24 Butterflies
- 25 Moths
- 26 Dragonflies (Odonata) in Britain and Ireland
- 27 Flies, beetles and bees, wasps and ants (Diptera, Coleoptera and aculeate Hymenoptera)
- 28 Hemiptera
- 29 Grasshoppers, crickets and allied insects
- 30 Aerial insect biomass: trends from long-term monitoring
- 31 Other invertebrates
- 32 Land and freshwater molluscs
- 33 The seashore
- 34 The offshore waters
- 35 Plants
- 36 Conclusion: what is the likely future for the wildlife in Britain and Ireland?
- Glossary
- Name index
- Subject index
- Plate section
- References
Summary
Summary
Insects are a key component of natural biodiversity, providing food for birds, mammals and other invertebrates, and pollinating many natural and cultivated plants. Despite this importance, there is a real lack of long-term data across Britain on the general abundance of most insect orders. An important source of information on aerial insect populations comes from the national network of 12.2 m high suction traps of the Rothamsted Insect Survey, which started operation with the first site in 1965. All aphids have been identified and counted from these samples and, of the 12 longest-running sites, seven show no trends, three increases and two overall declines in total aphid numbers. Recently a small sub-set of stored samples from these traps has been analysed for biomass and added to the aphid biomass to estimate total aerial biomass across all insect orders for four sites in southern Britain. At three of these sites there are no long-term trends, but the total biomass has declined severely at one site, Hereford. A more detailed analysis of the Hereford samples has been done, which indicated that the major component of the biomass decline is in the larger insects, particularly the Diptera (flies). Such declines may have been more widespread before the present sampling system was initiated, and may have had important conservation consequences, particularly for insectivorous birds and mammals.
- Type
- Chapter
- Information
- Silent SummerThe State of Wildlife in Britain and Ireland, pp. 540 - 555Publisher: Cambridge University PressPrint publication year: 2010
References
- 2
- Cited by