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INSECTS BIODIVERSITY
OUTLINE
 Definition
 Distribution
 Causes, consequences and cure for biodiversity loss
 Why we need biodiversity
 Ecology as a guide to conservation strategy,,,,,,,,,describe
 Ecosystem
 Ecology
 Community
 Population
 Individual species
INTRODUCTION
Biodiversity –
 Biodiversity includes the variety of ecosystems, which includes
communities of organisms within particular habitats and the
physical conditions under which they live
 Variety of organisms at all levels, from genetic variants belong to
the same species through arrays of species to arrays of genera,
families, and still higher taxonomic levels
Approximate number of described species
Viruses
Monera
Fungi
Algae
Plantae
Protozoa
Porifera
Coelenterata
Platyhelminthes
Nematoda
Annelida
Mollusca
Echinoderms
Insecta
Non-insect arthropoda
Minor invertebrate taxa
Chordata
Viruses 1,000
Monera 5,000
Fungi 47,000
Algae 27,000
Plantae 250,000
Protozoa 31,000
Porifera 5,000
Coelenterata 9,000
Platyhelminthes 12,000
Nematoda 12,000
Annelida 12,000
Mollusca 50,000
Echinoderms 6,000
Insecta 1,112,000
Non-insect arthropoda 125,000
Minor invertebrate taxa 10,000
Chordata 44,000
Total 1,758,000Insects alone 64%
With other arthropods 72%
WORLD SPECIES RICHNESS
 The no of species declines with body length
 Extrapolating to the left will show that many species of small organisms have not
yet been discovered and described.
Sampling insect
diversity in
space and time
Population and community
Population
A population is all the organisms
that both belong to the same
species and live in the same
geographical area
Community
A community is an assemblage
of two or more populations of
different species occupying the
same geographical area
Sampling insects communities
 Unlike monitoring population of single species, we
usually need sampling techniques to maximize the
number of species collected
 Detection probability –should be equal between species
 We need to standardize time and space to make diversity
measures comparable between sites
 Detection probability statistical method using repeated
sampling of the same sampling site combined with
hierarchical statistical methods to estimate the
occupancy of a site
Generic trapping systems or direct observation
methods
Walking and counting individuals and species
Insects living in canopies
Fogging forest canopy with insecticides
Ground-dwelling insects
Pitfall traps
Insects in grassland swards
Flying insects
Trapping insects from rivers
Sampling in time
 Density of sampling points
 Location of sampling points
 Should have enough points to sample the entire community
 Optimal timing of sampling depends upon the life history and
behaviour patterns of the insects and environmental conditions
Enough sampling effort to capture species with different
phenology
Example:
 Orthopterans: 2-3 times during summer; locusts, grasshoppers,
 Butterflies: 3-5 times
 Moths: every 2 weeks Optimal timing of sampling depends upon
the life history and behaviour patterns of the insects and
environmental conditions Enough sampling effort to capture
species with different phenology
Measuring diversity
Diversity
 Aim; Compare and describe diversity of different
communities (sites)
 Diversity refers to ”the variety and abundance of
species in a defined unit of study”
β-diversity
β (beta) diversity is a measure biodiversity which works by
comparing the species diversity between ecosystems or along
environmental gradients.
 β-diversity measures how different are the two communities
Why do we need insect diversity?
 Conservation of single species (populations)
 Conservation of communities
 Ecosystem services delivered by insects (pest control,
pollination, nutrient cycling…)
Threats to biodiversity
1.Land-use change,,,,,,,,,describe
2.Climate change,,,,,,,,,,describe
3.Invasions of exotic organisms,,,,,,,,,describe
Conservation biology evaluates the impact of these
pressures on biodiversity
OR the effectiveness of mitigation measures
Conservation of single species
(populations
 Extinctions of rare species: some species are
conserved because they are rare and endangered
 Imcludes Saproxylic -beetles (Osmoderma eremita,
Lucanus cervus) Butterflies (Parnassius apollo, L
ycaena phlaes) Dragonflies
DESCRIBE
Ecosystem Services
 Primary productions
 maintenance of the gaseous composition of the
atmosphere
 control of regional climates
 generation and maintenance of soils
 waste disposal
 nutrient cycling
 pollination
 pest control
Ecosystem Services
 Ecosystem services are benefits from a multitude of resources
and processes that are supplied by natural ecosystems
 Pollination (bees and other insects pollinating crops and wild
plants)
 Pest control (predators and parasitoids of pests) Nutrient
cycling (e.g. dung beetles promote
 Decomposition of dung into labile forms of nitrogen that can
be assimilated
Pollination
 The ecological and financial importance of natural
pollination by insects to agricultural crops, improving their
quality and quantity The vicinity of a forest
or wild grasslands with
native pollinators near
agricultural crops
Pest control
 Many potential crop pests are controlled by natural
enemies, including many spiders, parasitic wasps,
flies, and lady bugs.
 These natural biological control agents save farmers
money annually by protecting crops and reducing the
need for chemical control
END,,,,,,,,,,,,,,,,,,,,,,,,
THANKS

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Insects biodiversity

  • 2. OUTLINE  Definition  Distribution  Causes, consequences and cure for biodiversity loss  Why we need biodiversity  Ecology as a guide to conservation strategy,,,,,,,,,describe  Ecosystem  Ecology  Community  Population  Individual species
  • 3. INTRODUCTION Biodiversity –  Biodiversity includes the variety of ecosystems, which includes communities of organisms within particular habitats and the physical conditions under which they live  Variety of organisms at all levels, from genetic variants belong to the same species through arrays of species to arrays of genera, families, and still higher taxonomic levels
  • 4. Approximate number of described species Viruses Monera Fungi Algae Plantae Protozoa Porifera Coelenterata Platyhelminthes Nematoda Annelida Mollusca Echinoderms Insecta Non-insect arthropoda Minor invertebrate taxa Chordata Viruses 1,000 Monera 5,000 Fungi 47,000 Algae 27,000 Plantae 250,000 Protozoa 31,000 Porifera 5,000 Coelenterata 9,000 Platyhelminthes 12,000 Nematoda 12,000 Annelida 12,000 Mollusca 50,000 Echinoderms 6,000 Insecta 1,112,000 Non-insect arthropoda 125,000 Minor invertebrate taxa 10,000 Chordata 44,000 Total 1,758,000Insects alone 64% With other arthropods 72%
  • 5.
  • 6. WORLD SPECIES RICHNESS  The no of species declines with body length  Extrapolating to the left will show that many species of small organisms have not yet been discovered and described.
  • 8. Population and community Population A population is all the organisms that both belong to the same species and live in the same geographical area Community A community is an assemblage of two or more populations of different species occupying the same geographical area
  • 9. Sampling insects communities  Unlike monitoring population of single species, we usually need sampling techniques to maximize the number of species collected  Detection probability –should be equal between species  We need to standardize time and space to make diversity measures comparable between sites  Detection probability statistical method using repeated sampling of the same sampling site combined with hierarchical statistical methods to estimate the occupancy of a site
  • 10. Generic trapping systems or direct observation methods Walking and counting individuals and species
  • 11. Insects living in canopies Fogging forest canopy with insecticides
  • 16. Sampling in time  Density of sampling points  Location of sampling points  Should have enough points to sample the entire community  Optimal timing of sampling depends upon the life history and behaviour patterns of the insects and environmental conditions Enough sampling effort to capture species with different phenology Example:  Orthopterans: 2-3 times during summer; locusts, grasshoppers,  Butterflies: 3-5 times  Moths: every 2 weeks Optimal timing of sampling depends upon the life history and behaviour patterns of the insects and environmental conditions Enough sampling effort to capture species with different phenology
  • 18. Diversity  Aim; Compare and describe diversity of different communities (sites)  Diversity refers to ”the variety and abundance of species in a defined unit of study”
  • 19. β-diversity β (beta) diversity is a measure biodiversity which works by comparing the species diversity between ecosystems or along environmental gradients.  β-diversity measures how different are the two communities
  • 20. Why do we need insect diversity?  Conservation of single species (populations)  Conservation of communities  Ecosystem services delivered by insects (pest control, pollination, nutrient cycling…) Threats to biodiversity 1.Land-use change,,,,,,,,,describe 2.Climate change,,,,,,,,,,describe 3.Invasions of exotic organisms,,,,,,,,,describe Conservation biology evaluates the impact of these pressures on biodiversity OR the effectiveness of mitigation measures
  • 21. Conservation of single species (populations  Extinctions of rare species: some species are conserved because they are rare and endangered  Imcludes Saproxylic -beetles (Osmoderma eremita, Lucanus cervus) Butterflies (Parnassius apollo, L ycaena phlaes) Dragonflies DESCRIBE
  • 22. Ecosystem Services  Primary productions  maintenance of the gaseous composition of the atmosphere  control of regional climates  generation and maintenance of soils  waste disposal  nutrient cycling  pollination  pest control
  • 23. Ecosystem Services  Ecosystem services are benefits from a multitude of resources and processes that are supplied by natural ecosystems  Pollination (bees and other insects pollinating crops and wild plants)  Pest control (predators and parasitoids of pests) Nutrient cycling (e.g. dung beetles promote  Decomposition of dung into labile forms of nitrogen that can be assimilated
  • 24. Pollination  The ecological and financial importance of natural pollination by insects to agricultural crops, improving their quality and quantity The vicinity of a forest or wild grasslands with native pollinators near agricultural crops
  • 25. Pest control  Many potential crop pests are controlled by natural enemies, including many spiders, parasitic wasps, flies, and lady bugs.  These natural biological control agents save farmers money annually by protecting crops and reducing the need for chemical control