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INSECTS AS INDICATORS OF ENVIRONMENTAL CHANGING AND POLLUTION: A REVIEW OF APPROPRIATE SPECIES AND THEIR MONITORING

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Abstract

Responses of some species to disturbances can be used as a parameter of analysis about levels of change in the environmental services. These species can be used as environmental bioindicators. Class Insecta has many appropriate species. This paper aims an analysis of bioindicator species of the impact caused by intensive agriculture, deforestation, reforestation and pollution of aquatic and terrestrial environments.
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INSECTS AS INDICATORS OF ENVIRONMENTAL
CHANGING AND POLLUTION: A REVIEW OF
APPROPRIATE SPECIES AND THEIR MONITORING
OS INSETOS INDICADORES DE ALTERAÇÃO E
POLUIÇÃO AMBIENTAL: UMA REVISÃO DAS
ESPÉCIES ADEQUADAS E DO SEU MONITORAMENTO
José Renato Mauricio da Rocha1, Josimar Ribeiro Almeida2,
Gustavo Aveiro Lins3, Alberto Durval4
1Universidade Federal de Mato Grosso - UFMT. Rua. Bento Alexandre dos Santos,
717 Centro. CEP 78.280-000, Mirassol D'Oeste, MT
2UFRJ/Escola Politécnica/Cidade Universitária/bloco D/sala 204/Rio de Janeiro, RJ
3CEDERJ, SEE/RJ, CEDAE. Rua Farias Brito 50/104 - CEP 20540320, Rio de
Janeiro, RJ
4Universidade Federal de Mato Grosso - UFMT - Rua 213, Quadra 49, n. 13 setor 2
Bairro Tijucal, CEP 78.088-18,5 Cuiabá, MT.
ABSTRACT
Responses of some species to disturbances can be used as a parameter of
analysis about levels of change in the environmental services. These species can be
used as environmental bioindicators. Class Insecta has many appropriate species.
This paper aims an analysis of bioindicator species of the impact caused by intensive
agriculture, deforestation, reforestation and pollution of aquatic and terrestrial
environments.
Keywords: Bioindicators. Insecta. Environmental polution. Monitoring.
RESUMO
A resposta de algumas espécies animais e vegetais às perturbações pode ser
utilizada como parâmetro de análise quanto aos níveis de alteração do funcionamento
dos serviços ambientais, e por isso são consideradas bioindicadoras das alterações
ambientais. No entanto, algumas espécies respondem mais fidedignamente do que
outras a estas alterações. A classe Insecta possui muitos representantes adequados
para este tipo de análise. Este trabalho objetiva a análise das espécies consideradas
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bioindicadoras das consequências causadas pela agricultura intensiva, pelo
desflorestamento, reflorestamento e pela poluição de ambientes aéreos, aquáticos e
terrestres.
Palavras-chave: Insecta. Bioindicadores. Alteração ambiental. Poluição. Perícia
ambiental.
1. INTRODUCTION
There was a growing change of natural environments around the world, as a
result of the growth of human population in recent decades. The economic potential
of biodiversity and advanced destruction process of land ecosystems, especially in
tropical regions, led to the search for an extinction rate estimation of plant and animal
species, which are around 27,000 per year (ANDRADE, 1998; CHEY et al., 1997).
Invertebrates are more severely and quickly affected than other taxa by
changes in the landscape. The insects are responsible for many processes in the
ecosystem and its loss can have negative effects on entire communities. Thus, a
strong understanding of insect responses to human activity is necessary both to
support policy decisions for conservation and to evaluate functional consequences of
human disturbance on ecosystems (NICHOLSA et al., 2007).
Studies about biodiversity preservation in ecosystems can provide information
about maintenance of environmental resources and sustainable development. Insects
are the most abundant animals in almost all ecosystems and can be used to evaluate
the impact of environmental change. Through population and behavioral studies and
the taxonomy of species, it’s possible to estimate what the current degradation rate is
and its future consequences. This paper aims to analyze the major groups of insect
indicators on the aquatic and terrestrial environments.
2. ECOSYSTEMS MONITORING WITH BIOINDICATORS SPECIES
Currently, a relevant question is whether fragmented environments can
preserve the diversity and abundance of insect species such as the high degree of
endemism observed in wild areas. In addition to what would be the fragmented
environments consequences on generalist species populations, which are an important
link in the food chain and development of plant species for pollination.
Many arthropods are used for bioindication because: a) the most frequently
collected taxa (such as beetles and spiders) are polyphagous predators and are
considered important for the biological control, b) collections are made easily with
pitfall traps, and c) catches are usually large enough to allow statistical analysis.
According Martos et al. (1997), environmental indicators are quantitative and
qualitative parameters able to show changes in the environment, where physical,
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biological, chemical or human phenomena are not studied alone, but together in the
complex dynamics of the environment.
Entomofauna studies to furnish information about ecosystems conservation
status their productivity and levels of water contamination and pollution. Therefore,
bioindicator species identification is essential, due to the important role that these
organisms have as transformers and regulators of ecosystems (BROWN, 1991;
CAMERO and CHAMORRO, 1995 apud RUBIO, 1999).
Concern with environmental issues has raised the demand for bioindicators
able to reflect their environment. Among these organisms, the insects may contribute
to a practical assessment of the sustainability degree (LOPES, 2008). According
Tylianakis et al. (2004), indicator insects become particularly useful because they
represent more than half of all species and their diversity allow assessing the
difference between habitats on acceptable refined scale. Insect groups used as
environmental bioindicators should have the characteristics shown in the Table 1.
Table 1 - Insect groups characteristics used as environmental indicators
Characteristics Description
Richness and species diversity Four in five species of animals are insects
Easy handling
Most species require few efforts for their
capture, except toxic species.
The small size of samples helps to their
capture and transport;
Ecological faithfulness
Many species may have low tolerance to
abiotic factors, which allows to link
certain insect groups with certain
habitats;
Fragility to small changes
It allows to select demographical or
behavioral variables that can be
measured or observed in the field, and
have a close correlation with the pre
selected abiotic variables;
Organism’s responses To identify levels of environmental
change.
Modified from Andrade (1998); Peck et al. (1998).
Requirements for aquatic insects groups to be considered environmental
quality bioindicators differ slightly from the characteristics attributed to bioindicators
in land environments. According to Peck et al. (1998), the bioindicators are: a)
Respond quickly to environmental changes; b) Have few generations per year; c) Are
easily sampled and identified; d) Show high sensitivity for detecting early changes in
their geographical area; e) Provide information without interruption of the extent
damage caused by environment alteration or pollution.
Some taxonomical and sampling difficulties have restricted the use of several
species of Coleoptera (beetles) and Homoptera (bugs) Orders as environmental
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bioindicators, especially in the tropical region (HOLOWAY, 1983 apud CHEY et al.,
1997). These concerns were also demonstrated by Carlton and Robison (1998) with
subfamily Aleocharinae (Coleoptera: Staphylinidae) due to the large number of
undescribed taxa and the lack of reliability on those already described. Moreover,
Frouz (1999) reported as one of the disadvantage to the use of Diptera species (flies),
as environmental bioindicators, the great taxonomic difficulty, especially in their
larval stage.
3. BIOINDICATOR INSECT GROUPS
Several aquatic insects groups can be used as aquatic environment
bioindicators (Table 2). Odonata (dragonflies) species are very sensitive to changes
caused to their habitat, especially lakes and flooded drainage areas (CORBET, 1980).
Hamilton and Saether (1971) and Hardersen (2000) reported the potential of aquatic
insects as indicators of water quality. Several other species of the families Gyrinidae,
Dytiscidae, Hydrophilidae (Coleoptera), Notonectidae, Veliidae (Heteroptera) and
Plecoptera and Ephemeroptera Orders have high adaptive capacity, colonizing most
of the environments and occurring throughout the year, reflecting ecological and
geographical changes, and hence their conservation status.
The tolerance of aquatic organisms to heavy metals has been explained by the
metallothioneins (MTs) formation in many aquatic organisms. If the presence of MTs
is a measure of metal tolerance, the measurement of MTs could provide clues about
the tolerance in this organisms and possible toxic agents responsible for
environmental stress (BISTHOVEN et al., 1998). However, insects are less used as
pollution bioindicators by metals, although species of the genus Halobates are
suitable for bioindication of cadmium and mercury (NUMMELIN et al., 2007).
Land insects are good bioindicators in various types of environmental change
(Table 2). The Order Coleoptera represents approximately 20% of the total diversity
of arthropods and plays roles in maintaining soil quality, population regulation of
other invertebrates and energy flow, and contributes to the physical and chemistry
soil formation (CARLTON and ROBISON, 1998). Nummelin and Hanski (1989),
Nestel et al. (1993), Louzada and Lopes (1997) and Davis (2000) confirm beetles
species (Coleoptera: Scarabaeidae) have a high potential as environmental indicators
in forest area or agricultural crops.
Beetles from Order Coleoptera and Family Carabidae are important predators.
They participate of biological control, biological monitoring of pollution from oil,
sulfur, herbicides, CO2, insecticides and radioactive phosphorus.
The moths and butterflies (Lepidoptera), besides having basic requirements,
have ecological faithfulness in temperate and tropical regions and are very sensitive
to changes in the environment (GILBERT, 1984; ANDRADE, 1998). The habitat
mosaic maintenance that includes primary forests and other changed areas with
different change levels was the strategy suggested by Wood and Gillman (1998) to
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protect Lepidoptera diversity in natural environment management (WOOD and
GILLMAN, 1998).
Some lepidopteran groups are used as environmental pollution indicators by
heavy metals and carbon dioxide (CO2 concentration) in locations close to industrial
areas and even within urban areas. Presence and consequences of copper, iron, nickel,
cadmium, sulfuric acid ions and other substances used in fertilizers were studied with
pupae of different Geometridae and Noctuidae species (HELIÖVAARA and
VÄISÄNEN, 1990), Eriocraniidae populations (KORICHEVA and HAUKIOJA,
1992), cycle duration and newly hatched larval mortality rate from butterflies (Family
Nymphalidae), which feed on plants subjected to high CO2 concentrations (FAJER et
al., 1989).
Collembola are primitive insects that influence soil fertility through microbial
activity stimulation, the fungi spore distribution and inhibit fungi and bacteria action
causing diseases in plants (SAUTER and SANTOS, 1991; RUSEK, 1998). They are
very sensitive to changes in the soil and diversity reduction can show us pollution by
heavy metals, pesticides in agricultural soils and soil water acidification by organic
pollutants and waste (RUSEK, 1998).
Ants are used as soil quality bioindicators and have a key role in the recovery
of degraded and reforested areas (MEJER, 1984). This group, which is very sensitive
to human impact, could be used as environmental indicators in different ecosystems
(FOLGARAIT, 1998; PECK et al., 1998). Depending on the degree of the
environmental change, many expert species are extinct of the site, encouraging the
establishment of dominant, aggressive and generalist species, which can be used as
indicators of disturbed habitats (READ, 1996). The ants presented a strong resistance
to pollutants (radioactive and industrial pollutants) that may be because only about
10% of individuals fall outside the nest and exposed to the harmful pollution effects
(PETAL, 1978). Peck et al. (1998) suggest that some ant groups have potential as
biological indicators of soil conditions, crop management and assessment systems for
plantations in agroecosystems. The impact of ants in soil is demonstrated by leaf
cutting ones in the tropics, where they are the most important agent of change in the
soil, contributing to improving physical and chemical quality (CHERRET, 1989).
Order Diptera is a very heterogeneous group and there are some restrictions on
its use as bioindicator because of the lack of ecological knowledge of many groups of
flies. However, some flies species are considered good environmental change
bioindicators. Bartosova et al. (1997) showed the potential of species from the Family
Sarcophagidae as environmental pollution indicators by heavy metals, asbestos fibers
and waste chemicals. However, due to variability in the flies’ sensitivity to
insecticides and herbicides, Frouz (1999) recommends that one must be careful when
using some species of flies as chemical indicators of contaminated soil.
Family Syrphidae, one of the largest families of Diptera, has wide distribution,
well known taxonomy and its larvae require different environmental conditions,
which makes these flies’ good bioindicators. Due to environmental requirements of
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their larvae, these insects are particularly affected by the landscaping diversity
reduction (SOMMAGGIO, 1999).
Most of the research on pollinators as bioindicators have been on population
level and have focused mainly on bees. The pollinator strength and its population size
are generally considered the most important features for plant reproduction,
especially to the agricultural crops (KEVAN, 1999). Pollinators, especially
honeybees (Apis mellifera), are considered reliable biological indicators because they
show environment chemical impairment due to high mortality rate and intercept
particles suspended in air or flowers. These substances can then be detected using
methods of analysis (GHINI et al., 2004).
Table 2 - Bioindicator insect groups from aquatic and land environments and their role in the
monitoring.
Group Common Names Biomonitoring Habitat
Odonata Order dragonflies and damselflies water quality aquatic
Gyrinidae
Dytiscidae
Hydrophilidae
Notonectidae
Vellidae Families
whirligig beetles
predaceous diving beetles
backswimmers
due to high adaptive
capacity aquatic
Ephemeroptera
Plecoptera Orders
mayflies
stoneflies
due to high adaptive
capacity aquatic
Halobates oceanskaters cadmium and lead aquatic
Coleoptera Order
Scarabaeidae Family beetles in forest and agricultural
crop land
Coleoptera Order
Carabidae Family beetles
biological control
oil, sufur, herbicide, CO2,
insecticide pollution
land
Lepidoptera Order moths and butterflies
more sensitive
environmental changes
heavy metals and CO2
pollution
land
Collembola Order springtails
pollution by heavy metals,
pesticides and water
acidity
land
Formicidae Family ants
degraded and reforested
areas recovery
land
Diptera Order
Sarcophagidae Family flies and mosquitos heavy metals land
Diptera Order
Syrphidae Family flies and mosquitos are affected by diversity
reduction land
Apis mellifera domestic bees chemical environmental
changes land
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4. BIOINDICATOR INSECTS IN AGRICULTURAL AND FOREST AREAS
Cultivated areas or reforested areas with some diversity of plant species have
shown high insect species diversity and greater ecological stability, where the
competition for resources is intense, preventing the prevalence of few dominant
species (CHEY et al., 1997; DORVAL, 1995; MEZZOMO et al., 1998).
Explanations for loss of species in agricultural environments are: changes in
microclimatic conditions, foraging activity and nesting locations, reduced food
availability from the use of agrochemicals and interactions with other species (DE
BRUYN, 1999).
Monoculture is predominant in agricultural areas. In these areas there are many
populations of defoliator and sucking insects, characteristics of unbalanced
environment (ABATE et al, 2000). The use of fertilizers and chemicals is responsible
for the decline of biodiversity in simplified agricultural systems since it eliminates a
large number of insects acting as biological control agents.
Hymenoptera communities are common in agricultural areas. They act as crops
and wild plant pollinators. Furthermore, many species that live in society are
predators or parasitoids, acting as of biological control agents (TYLIANAKIS et al.,
2004).
We should consider the adoption of environmentally correct practices in areas
under agricultural management. The aeration depth control could prevent layers
destruction, where the activity of decomposer organisms (Collembola, Coleoptera) is
intense. The rational use of products to soil correction, fertilization and crop residues
incorporation can improve the organic soil part and provide optimal conditions for
decomposer insects and nitrogen fixing bacteria, increasing insect biodiversity.
Nummelin and Hanski (1989), Nestel et al. (1993), Perfecto et al. (1997), Honek and
Jarosik (2000) confirm the importance of cultural diversity for the preservation of the
diverse insect groups characteristic of not much changed areas.
In the forest, the imbalance begins with native vegetation replacement, which
normally has high insect diversity, for homogeneous plantation areas, where
ecological balance is fragile and insect diversity is reduced. Therefore, the number of
harmful insect species is quite high and frequently occurring population booms,
especially of defoliator lepidopteran (DORVAL, 1995).
The reforestation is usually located in nutrient-poor soils, and at certain times
of year the trees are exposed to water stress, becoming highly susceptible to attack by
insects. During this period there may be population booms of aggressive and
dominant insects.
Remaining strains of trees selective logging can serve as a host material,
providing favorable conditions for occurrence of dominant Scolytidae species
(ambrosia-beetle) population booms. Moreover, there is the fire that destroys
important soil layers, causing damages and weakening the trees, becoming them
susceptible to attack by insects.
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Therefore, the occurrence of harmful and dominant insect species in
agricultural and forest environments may be environmental imbalance evidences,
caused by changes in biotic and abiotic factors (Table 3).
Table 3 - Difference between agricultural and forest areas during biomonitoring
Agricultural Area Forest Area
defoliator and sucking insects deforestation increases number of harmful
insects
diversity reduced due to fertilizers deforestation decreases insect diversity
pollinators: bees and wasps reforestation occurs in poor soil, increases
water stress and insects attacks
Social species: biological control
remaining strains: host material to ambrosia
beetle
Fire: destroys soil and trees
5. INSECTS AS BIOINDICATORS OF ENVIRONMENTAL POLLUTION
Many insects can be used as environmental pollution bioindicators (Table 4).
Ants have been used to measure pollutant concentrations in borealis forests and
Australia, and are currently used to monitor disturbed ecosystems. Bees are
considered one of the most versatile and efficient bioindicators. They are used to
monitor trace metals in urban environments, radioactivity after the Chernobyl
disaster, pesticides and herbicides effects, industrial wastes and pollutants (URBINI
et al., 2006).
Many studies have demonstrated deformities in larvae from several genera
from the Family Chironomidae (eg Procladius, Chironomus and Cryptochironomus)
and the results indicate that the abnormalities are strongly associated with polluted
sediments (SERVIA et al., 1998). Gerridae are indicated to detection of different iron
and manganese concentrations, but seem less suitable for nickel and lead
accumulated (NUMMELIN et al., 2007).
Wasps from the Polistes and other social wasps are at the top of the food chain
and, therefore, are exposed to dangerous biological concentration. As its mass larval
fecal can accumulate lead up to 36 times the adult body, these wasps seem to be a
promising species for pollution by lead biomonitoring (URBINI et al., 2006).
Table 4 - Insects groups used as environmental pollution bioindicators
Groups Biomonitoring
bees trace metals, radioactivity, pesticides, herbicides
and industrial pollutants
ants polluent concentration at Australia
Larvae Family Chironomidae iron and manganese concentration
Genus Polistes (wasps) lead pollution
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6. OTHER BIOINDICATOR INSECT GROUPS
According to Eggleton et al. (1994), termites are important decomposers in
land ecosystems. Its activity increases soil infiltration capacity, leading to water
retention and soil productivity. In forests, they play a role in plant origin material and
organic soil decomposition and incorporation. In agricultural, pasture and
reforestation areas they are not always perceived because its nests are underground,
and their presence is only noticed by the damage they cause to the plants.
Aphids are pollution indicators, because they show an increase in their
population density when feeding on hosts exposed to environments with high CO2
concentrations. However, studies showed no significant correlation between CO2
increase and Homoptera population density (CANNON, 1998).
7. CONCLUSIONS
The use of bioindicators is essential for environmental monitoring. The main
characteristics of a bioindicator are: richness and diversity species, easy handling,
ecological faithfulness, fragility to small environmental changes and good organism
responses. Class Insecta has all of them. However, some species respond better than
others to these changes and according to the environment.
In the aquatic environment, Odonata species are more sensitive to
environmental changes in the water. Coleoptera, Heteroptera, Plecoptera and
Ephemeroptera have high adaptive capacity. In the land, Coleoptera Order has many
bioindicator species, for example Scarabaeidae Family (beetles) in forest and
agricultural cultures. Some Lepidoptera and Diptera groups are used as heavy metal
pollution indicators.
Agricultural and forestry systems have shown high insect diversity and better
ecological stability in relation to monoculture. The use of fertilizers and chemicals
reduces biodiversity in simplified agricultural areas. In the forest, the imbalance
begins with replacement of native vegetation, in areas of homogeneous plantations.
Therefore, it increases the number of harmful insects, especially defoliator
lepidopteran.
In environmental pollution, bees are used to monitor trace metals in urban
environments, radioactivity, and pesticide and herbicide effects. Gerridae detect
different iron and manganese concentrations.
Therefore, this study concluded that the Class Insecta has many potential
representatives that can be used as environmental bioindicators, among which are
some species from the Coleoptera, Diptera, Lepidoptera, Hymenoptera, Hemiptera,
Isoptera Orders and others.
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Manuscrito recebido em: 10/03/2008
Revisado e Aceito em: 22/12/2010
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