Importance of Insects in the Ecosystem: A Review
Mansowr ZF
Published on: 2025-01-10
Abstract
Insects represent one of the largest and most important groups in the phylum Arthroptera and kingdom Animalia. There are several reasons why insects are important to review the provision of ecosystem services (ESs) by insects. First, it is globally widespread and exhibits high species richness and high biodiversity, exceeding that of other arthropods in well-studied ecosystem services. Here we explain how these organisms are important by mentioning their effective role in the ecosystem.
Keywords
Arthropoda; Ecosystem services; InsectsIntroduction
Class Insecta occupies 80% of the kingdom Animalia and is considered one of the most biodiverse groups in the ecosystem; they are cosmopolitan and exhibit close relationships with other living organisms [1,2].
There is widespread consensus that insects play an essential role in ecological and economic services of importance to our planet, so insects are known as ecosystem services (ESs) that are of value to society by supporting either directly or indirectly the quality of human life [3,4].
However, the scope and nature of the ecosystem services they provide are not well understood. Here we provide a synthesis of how these organisms perform important ecosystem services, such as their role as pollinators in plant reproduction, in improving soil fertility through waste bioconversion, and in natural biocontrol for harmful pest species, and they provide a variety of valuable products for humans, such as honey and silk, and medical applications such as maggot therapy.
In addition, insects have assumed their place in human cultures as collection items and ornaments and in movies, visual arts, and literature, and we will focus on their additional services as a sustainable alternative to meat for human consumption [5].
The Role of Insects in Ecosystems
The ecosystem services that insects provide are not only found in the natural environment, but are also found in anthropic landscapes and the semi-natural habitats [6]. These ecosystem services are generally described as the direct or indirect benefits given by the nature to the human society [7-9].
Insects are the most abundantly found living organisms on our planet. Nearly 1 million species of insects are described so far, and nearly 5 million species still need documentation [10]. Insects are the environmental engineers and the major service providers to our ecosystems [11]. They perform many crucial functions like biological control of agricultural pests, recycling of nutrients, dispersal of fungal spores, disposing of waste products and animal dung, and enhancing agricultural productivity [12,13]. They are involved in the propagation of plants by promoting pollination and seed dispersal and help in maintaining the structure of plant community through phytophagy and seed feeding [14-16]. Insects provide food for insectivorous birds, mammals, reptiles, and fishes and maintain the structure of animal communities by transmitting diseases in large animals and predating or parasitizing small animals. Certain insects are greatly beneficial to us, as they either provide the food that we eat or the materials that we use. (Table 1, Figure 1).
Table 1: Ecosystem Services Provided by Different Insect Orders.
|
Order |
Insects |
Feeding guild |
Ecosystem Services |
|
Hymenoptera |
Wasps |
Predators |
Biological control of pests |
|
Coleoptera |
ground beetles, lady birds |
||
|
Mantodea |
Praying mantis |
||
|
Hymenoptera |
Wasps |
Parasitoids |
Biological control of pests |
|
Hymenoptera |
Bees |
Herbivores |
Pollination |
|
Lepidoptera |
Butterflies , Moths |
||
|
Hymenoptera |
Ants |
Carnivores |
Scavengers, Seed dispersal, Bioturbation |
|
Isoptera |
Termites, |
Herbivores |
Decomposers |
|
Coleoptera |
Dung beetles, Weevils |
||
|
Orthoptera |
Locusts |
Herbivores |
Food For humans |
|
Coleoptera |
Beetle larvae |
||
|
Hymenoptera |
Wasps |
||
|
Odonata |
Dragonflies &Damselflies |
Herbivore& Carnivores |
Food for animals |
|
Ephemeroptera |
May flies |
||
|
Diptera |
Mosquitos, fly |
||
|
Hymenoptera |
Wasps |
||
|
Hemiptera |
Aphids |
||
|
Orthoptera |
Locusts, grasshopper, crickets |
|
medicines and to cure diseases |
|
Homopter |
Bugs , Mealy bugs |
||
|
Coleoptera |
Wasps |
||
|
Hymenoptera |
House fly |
||
|
Diptera |
Larvae of the May beetle , Blister beetles |

Figure 1: The Role of Insects in Ecosystem.
Regulation of Agricultural Arthropod Pests
Insects play an important role as regulators of insect populations in natural ecosystems; they are also likely to be important as bio-control agents. For example, at least 30,000 species of aculeate wasps are known to hunt a wide range of arthropods as predators or parasites [17,18].
Unlike chemical pesticides, biological control is based on pre-existing predator–prey relationships, meaning that pest resistance is unlikely. Insects provided by biological control have an estimated value of 417 billion (USD) per year [8]. In North America alone, the value of natural control provided by insects was estimated at 4.5 billion (USD) annually [1]. Most successful examples of biological control using invertebrates have involved parasitoid wasps [19,20].
Pollination Services
Over 75% of human-cultivated crops worldwide depend directly on insect pollination [21]. About 88% of angiosperm plants are pollinated by insects [22]; the pollination services provided by insects are estimated to be worth over 250 billion (USD)/year worldwide [9]. The Hymenoptera are often considered a “beneficial” order because of the importance of pollination, for which many species are adapted, especially the bees and most species of wasps.
Decomposition and Nutrient Cycling
The role of insects in decomposition and nutrient cycling is almost entirely unstudied. Wasps primarily predate live prey. Social insects have been reported engaging in necrophagy (the eating of dead or decaying animals); carcasses are a source of amino acids, lipids, protein, carbohydrates, vitamins, and minerals, although the quality of these resources depends on the taxon and stage of decomposition [23].
Ants play a vital role in removing dead arthropods from the environment, and they play an important role in the redistribution of nutrients in nature. This is an essential ecosystem process and a key energetic link between higher trophic levels, decomposers, and primary producers [4].
Insects as Biological Indicators
Biological indicators are taxa that reflect the state of an environment, the effect of environmental change on a habitat or ecosystem, or the diversity of a subset of taxa within an area [24]. Due to their important ESs, ubiquity, and abundance, insects make excellent biological indicators [25]. Theoretically, the predatory and parasitic insects should be particularly useful in indicating the health of an ecosystem: by ranking highly in food webs, their presence in a habitat indicates the presence of an abundant and diverse community of prey arthropods [26].
A best example of this Social insects like termites, ants, bees, and wasps are frequently used as bioindicators. Wasps are considered biological indicators of habitat quality, biodiversity, and pollution resulting from human activities.
Insects make us aware of the status of the habitat they inhabit. While various termite species are used as bioindicators for assessing the habitat quality [27], different ant species are used for analyzing habitat restoration, heavy metal contamination, and land management practices [28]. Honeybees are used as the bioindicators of environmental pollution [29]. Wasps are employed to check the status of habitat conservation [30], and ants and wasps, which are considered biological indicators of habitat quality, biodiversity, and pollution resulting from human activities.
Unlike vertebrate keystone predators, sampling insect populations and measuring their abundance is relatively cheap and easy [26].
Medicinal Properties
The venom of bees and wasps is a complex mixture of toxins, allergens, enzymes, and amines [31]; it is unsurprising that venoms contain many biologically active molecules that are of significant pharmacological interest.
Of recent interest is the potential of wasp venom in the treatment of cancer [32]. This venom has antimicrobial properties. Anoplin, a peptide isolated from the venom of Anoplius samariensis (Pompilidae), and Eumenitin, isolated from the venom of Eumenes rubronotatus (Vespidae), show strong inhibitory activity against both Gram-positive and Gram-negative bacteria [33,34].
Both folk and traditional insect medicines (entomotherapy and entomoprophylaxis) are widely used around the world [35]. Many communities in Africa consume insects having medicinal properties, as these insects act as appetizers, enhance sexual desires, and cure asthma and heart diseases [36].
Finally, from a biomedical perspective, there is a growing research field exploiting the biochemical components of social wasp venom for antimicrobial properties and use in the treatment of cancer and other diseases.
Insects as Nutrition for Humans
Insects deliver a host of ecological services that are fundamental to the survival of humankind, and they are commonly consumed as a food source in many regions of the world [4].
It is estimated that insects form part of the traditional diets of at least 2 billion people. More than 2000 species have reportedly been used as food [37].
Insects are heavily influenced by cultural and religious practices. The global increase in demand for meat and the limited land area available prompt the search for alternative protein sources. Also, the sustainability of meat production has been questioned. Edible insects can be used as an alternative source of protein in human food [37].
Globally, the most commonly consumed insects are beetles (Coleoptera) (31%), (Lepidoptera) (18%), bees, wasps, and ants (Hymenoptera) (14%). Following these are grasshoppers, locusts, and crickets (Orthoptera) (13%); cicadas, leafhoppers, plant hoppers, scale insects, and true bugs (Hemiptera) (10%); termites (Isoptera) (3%); dragonflies (Odonata) (3%); flies (Diptera) (2%); and other orders (5%) [37].
Nutrition
It is difficult to generalize the nutritional value of insects, because it varies with species, gender, developmental stage, diet, and environmental factors (temperature, humidity, and photoperiod) and even with the analytical methods used [38]. Many species are rich in protein and fat, essential fatty acids, as well as vitamins and minerals [39,40].
Protein
The protein content on a dry-matter basis of insects is about 7-91%, and many species contain approximately 60% protein [38]. The digestibility of protein from insects is highly variable, partly because a part of the AA in cuticular protein is bound to chitin, a polysaccharide and component of the exoskeleton of insects [40].
The species from the order Orthoptera (grasshoppers, crickets, and locusts) are rich in proteins and represent a valuable alternative protein source [41].
Wasps account for 4.8% of the insect species consumed: there are more than 109 wasp species reported as being eaten across more than 20 countries. This is likely to be an underestimate since many wasps sold for human consumption can only be identified to genus level, and data are only known for a small number of countries [42,43].
Wasp larvae have an exceptional dry protein mass (46-81%), typically contain around 70% of required amino acids, and have an extremely low fat content [44].
Typically, wasps are eaten in their larval or pupal stages, and thus mainly social species are utilized, since the nests of solitary species are rarely large enough to merit the efforts of collection [45].
During the autumn harvest in Japan, wasp nests typically sell for USD 100 per kg, and demand is often so high that markets must be supplemented by the importation of further nests from China, New Zealand, and the Republic of Korea [46]. Wasps are a popular street food in East Asia, Africa, and South America [47].
In rural China, wasps are the most common edible insects for sale; more than 18 species have been recorded at market [42]. Furthermore, in tropical climates, the perennial colony cycles of wasps mean they are a reliable food source that can be collected year-round [48].
Fat Content
After protein, fat represents the second largest portion of the nutrient composition of edible insects, ranging from 13% for Orthoptera (grasshoppers, crickets, locusts) to 33% for Coleoptera [40].
The larvae of the African palm weevil are considered a delicacy in Nigeria. The lipid content of this larva, 67% on a dry weight basis, is higher than the amount found in most conventional protein foods such as beef, chicken, eggs, and milk [49].
Micronutrients
Most species of insects contain little calcium because insects, like other invertebrates, do not have a mineralized skeleton [38]. Several insect species, such as crickets, palm weevils, termites, and caterpillars, were shown to be rich in content of zinc and iron. This is interesting as the proportion of the world population at risk for zinc deficiency is more than 17% for zinc and 25% for iron deficiency [50,51].
In a study in Kenya, crickets and termites proved to have a high iron and zinc content; assuming a bioavailability of 10%, 10 g of crickets would cover 114% of the recommended nutrient intake for iron for adult males and 53% for adult females; these figures for zinc are 36% and 51% [52].
In the Democratic Republic of the Congo, the benefits were investigated of a cereal made with caterpillars and used as a micronutrient-rich supplement to complementary feedings in infants aged between 6 and 18 months [53]. Infants aged 6–12 months were provided with 30 g of caterpillar cereal daily and infants aged 12–18 months with 45 g (100 g containing 1840·96 kJ (440 kcal), 23 g protein, 21 g fat, 40 g carbohydrate, and 12·7 mg Fe and 12·7 mg Zn). Infants in the cereal group had higher Hb concentration and fewer were anaemic compared with the usual diet.
Food for Animals
Insects can also be used as feedstock for pets, livestock, and fish. The candidate insect species are the black soldier fly, Hermetia illuscens (Diptera: Stratiomyidae); the common housefly, Musca domestica (Diptera: Muscidae); and, to a lesser extent, mealworms, locusts/grasshoppers/crickets, and silkworms. The advantage of the fly species and the mealworms is that they can be reared on organic side streams, interesting because one-third of the produce in the food and agriculture industry is wasted [54]. Low-value organic products can in this way be transformed into high-value protein products [55].
Maggots are important sources of animal proteins for poultry: they have a dry matter of 30 percent of their total wet larval mass, 54 percent of which is crude protein. Maggots can be offered fresh [56].
In Nigeria and Cameroon, for example, maggot production could provide an excellent source of animal protein for local poultry farms [57,58]. In South Korea, Hwangbo et al. [59] explored the contribution of maggots to the meat quality and growth performance of broiler chickens and found that feeding diets containing 10–15% maggots can improve the carcass quality and growth performance of broiler chickens. In Nigeria, Awoniyi et al. [60] evaluated the replacement of fishmeal with maggot meal and found that diets in which 25% of fishmeal was replaced with maggot meal were most efficient in terms of average weekly weight gain and protein efficiency rate.
Insects as a Source of Income
The harvesting and marketing of edible insects can improve livelihoods, in particular of women. Examples are: harvesting the Mopane caterpillar Imbrasia belina (Lepidoptera: Saturniidae) in Southern Africa is an 85 million USD business [61,62]. Another example is the marketing of the edible stinkbug, Encosternum delegorguei (Hemiptera: Tessaratomidae), in sub-Saharan African countries, which mainly benefits women in impoverished rural communities [63]. Edible pupae of a saturniid wild silkworm are commercially reared for sericulture in Madagascar and contribute to poverty alleviation [64].
The larvae of the African palm weevil, Rhynchophorus phoenicis (Coleoptera: Curculionidae), are popular food throughout the humid tropics. In the Congo Basin and Cameroon, they are consumed by the majority of the inhabitants; their exploitation and trade by forest-dependent communities is an important source of income [65].
Conclusion
In Thailand, insect farming is expanding rapidly and offers significant income and livelihood opportunities for tens of thousands of Thai people engaged in insect farming, processing, transport, and marketing [66]. About 20,000 domestic cricket farms in Thailand produce an average of 7,500 metric tonnes of insects annually for home consumption and for the market [67]. To improve the health status of people in a province of Cambodia, the cricket Teleogryllus testaceus (Orthoptera: Gryllidae) is mass-produced as a sustainable, cost-effective, and high-quality alternative source of protein to traditional livestock [68-71].
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