Protocooperation is where two

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

interact with each other beneficially; they have no need to interact with each other - they interact purely for the gain that they receive from doing this. It is not at all necessary for protocooperation to occur; growth and survival is possible in the absence of the interaction. The interaction that occurs can be between different

kingdoms Kingdom commonly refers to: * A monarchy ruled by a king or queen * Kingdom (biology), a category in biological taxonomy Kingdom may also refer to: Arts and media Television * ''Kingdom'' (British TV series), a 2007 British television drama s ...

. The term, initially used for intraspecific interactions, was popularized by

Eugene Odum Eugene Pleasants Odum (September 17, 1913 – August 10, 2002) was an American biologist at the University of Georgia known for his pioneering work on ecosystem ecology. He and his brother Howard T. Odum wrote the popular ecology textbook, ''Funda ...

(1953), although other authors prefer to use the terms "

cooperation Cooperation (written as co-operation in British English) is the process of groups of organisms working or acting together for common, mutual, or some underlying benefit, as opposed to working in competition for selfish benefit. Many animal a ...

" or " mutualism".Bronstein, J. L. (2015). The study of mutualism. In: Bronstein, J. L. (ed.). ''Mutualism''. Oxford University Press, Oxford
link

Mutualism

Protocooperation is a form of mutualism, but the cooperating species do not depend on each other for survival. An example of protocooperation happens between

soil Soil, also commonly referred to as earth or dirt, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life. Some scientific definitions distinguish ''dirt'' from ''soil'' by restricting the former te ...

bacteria Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among ...

fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from ...

, and the plants that occur growing in the soil. None of the species rely on the relationship for survival, but all of the fungi, bacteria and higher plants take part in shaping soil composition and fertility. Soil bacteria and fungi interrelate with each other, forming nutrients essential to the plants survival. The plants obtain nutrients from root nodules and decomposing organic substance. Plants benefit by getting essential mineral nutrients and

carbon dioxide Carbon dioxide (chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is transpar ...

. The plants do not need these mineral nutrients but do help the plant grow even further.

Examples

Ants and aphids

A further example of protocooperation is the connection between

ant Ants are eusocial insects of the family Formicidae and, along with the related wasps and bees, belong to the order Hymenoptera. Ants evolved from vespoid wasp ancestors in the Cretaceous period. More than 13,800 of an estimated total of 22 ...

s and

aphid Aphids are small sap-sucking insects and members of the superfamily Aphidoidea. Common names include greenfly and blackfly, although individuals within a species can vary widely in color. The group includes the fluffy white woolly aphids. A t ...

s. The ant searches for food on trees and shrubs that are hosts to honeydew-secreting species such as aphids,

mealybug Mealybugs are insects in the family (biology), family Pseudococcidae, unarmored scale insects found in moist, warm habitats. Many species are considered pest (animal), pests as they feed on plant juices of greenhouse plants, house plants and sub ...

s, and some

scales Scale or scales may refer to: Mathematics * Scale (descriptive set theory), an object defined on a set of points * Scale (ratio), the ratio of a linear dimension of a model to the corresponding dimension of the original * Scale factor, a number w ...

. The ant gathers the sugary substance and takes it to its nest as food for its offspring. It has been known for the ant to stimulate the aphid to secrete honeydew straight into its mouth. Some ant species even look after the honeydew producers from natural predators. In areas where the ant inhabited the same ecosystem as the aphid, the plants they inhabit normally suffer from a higher presence of aphids which is detrimental to the plant but not to the two species protocooperating.

Flowers and insects

The

flower A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Angiospermae). The biological function of a flower is to facilitate reproduction, usually by providing a mechani ...

s of

plant Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclud ...

s that are pollinated by insects and birds benefit from protocooperation. The plants, particularly those with large bright colourful flowers bearing nectar glands, experience cross pollination because of the insects activities. This is beneficial to the insect that has got the food supply of pollen and nectar required for its survival.

Birds

Protocooperation can occur in

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...

s. The

Egyptian plover The Egyptian plover (''Pluvianus aegyptius''), also known as the crocodile bird, is a wader, the only member of the genus ''Pluvianus''. Formerly placed in the pratincole and courser family, Glareolidae, it is now regarded as the sole member of ...

removes insect pests from the backs of buffalo,

antelope The term antelope is used to refer to many species of even-toed ruminant that are indigenous to various regions in Africa and Eurasia. Antelope comprise a wastebasket taxon defined as any of numerous Old World grazing and browsing hoofed mammals ...

giraffe The giraffe is a large African hoofed mammal belonging to the genus ''Giraffa''. It is the tallest living terrestrial animal and the largest ruminant on Earth. Traditionally, giraffes were thought to be one species, ''Giraffa camelopardalis ...

s, and

rhino A rhinoceros (; ; ), commonly abbreviated to rhino, is a member of any of the five extant species (or numerous extinct species) of odd-toed ungulates in the family Rhinocerotidae. (It can also refer to a member of any of the extinct species o ...

s. The

cattle egret The cattle egret (''Bubulcus ibis'') is a cosmopolitan species of heron (family Ardeidae) found in the tropics, subtropics, and warm-temperate zones. It is the only member of the monotypic genus ''Bubulcus'', although some authorities regard it ...

in America as well does the same task of removing the unwanted insects and parasites.

Fish

Certain

fish Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of li ...

perform the task of cleaning other fish, by removing ectoparasites, cleaning wounded flesh, and getting rid of dead flesh. Even predatory fish rely on cleansing symbionts, and adopt a placid state while they are cleansed. The fish that do the cleansing are often concentrated around specific sites where the other fish come to be cleansed. These are known as cleansing stations.

Bacteria

Prominently exhibited between ''Lactobacillus delbrueckii ssp Bulgaricus'' and ''Streptococcus thermophillus'', the tw
symbiotic starter bacteria
commonly used i
yoghurt starter culture
''S. thermophilus'' produces pyruvic acid, formic acid, folic acid, ornithine, long-chain fatty acids, and {{CO2 which stimulates the growth of ''L. bulgaricus.'' The acid lowers the pH of the milk to an optimal level for ''L. bulgaricus. L. bulgaricus'' produces peptides, free amino acids, and putrescine through proteolysis, which stimulate the growth of ''S. thermophilus.''

References

Ecology