Linguistic diversity index (LDI) may refer to either Greenberg's (language) Diversity Index [1] or the related Index of Linguistic Diversity (ILD) from Terralingua, which measures changes in the underlying LDI over time. [2]
Greenberg's Diversity Index (LDI) is the probability that two people selected from the population at random will have different mother tongues; it therefore ranges from 0 (everyone has the same mother tongue) to 1 (no two people have the same mother tongue). [3] The ILD measures how the LDI has changed over time; a global ILD of 0.8 indicates a 20% loss of diversity since 1970, but ratios above 1 are possible, and have appeared in regional indexes. [4]
The computation of the diversity index is based on the population of each language as a proportion of the total population. The index cannot fully account for the vitality of languages. Also, the distinction between a language and a dialect is fluid and often political. A great number of languages are considered to be dialects of another language by some experts and separate languages by others. The index does not consider how different the languages are from each other, nor does it account for second language usage; it considers only the total number of distinct languages, and their relative frequency as mother tongues. [5]
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Ethnologue: Languages of the World is an annual reference publication in print and online that provides statistics and other information on the living languages of the world. It is the world's most comprehensive catalogue of languages. It was first issued in 1951, and is now published by SIL International, an American evangelical Christian non-profit organization.
Tamang is a term used to collectively refer to a dialect cluster spoken mainly in Nepal, Sikkim, West Bengal (Darjeeling) and North-Eastern India. It comprises Eastern Tamang, Northwestern Tamang, Southwestern Tamang, Eastern Gorkha Tamang, and Western Tamang. Lexical similarity between Eastern Tamang and other Tamang languages varies between 81% and 63%. For comparison, lexical similarity between Spanish and Portuguese, is estimated at 89%.
Kalinga is a dialect continuum of Kalinga Province in the Philippines, spoken by the Kalinga people, alongside Ilocano. The Banao Itneg variety is not one of the neighboring Itneg languages.
Bade is a West Chadic language spoken by the Bade people in Yobe State and Jigawa State, Nigeria. Their traditional ruler is the Emir of Bade. Similar to many other Western African languages, Bade is a vulnerable language at great risk of extinction. With 356,000 speakers, the language and the culture of the Bade people have suffered over the last several years. As the language continues to fade, the culture and historic value associated with the language perishes as well. The local dialect is shifting from Bade to Hausa. Across West Africa, the impact on local communities through the loss of the indigenous tongues will be significant. The endangerment of the Bade language represents the worldwide language diversity that is at risk. Many African languages have only received little linguistic attention, impacting these African languages.
Negidal is a language of the Tungusic family spoken in the Russian Far East, mostly in Khabarovskij Kraj, along the lower reaches of the Amur River. Negidal belongs to the Northern branch of Tungusic, together with Evenki and Even. It is particularly close to Evenki, to the extent that it is occasionally referred to as a dialect of Evenki.
Biocultural diversity is defined by Luisa Maffi, co-founder and director of Terralingua, as "the diversity of life in all its manifestations: biological, cultural, and linguistic — which are interrelated within a complex socio-ecological adaptive system." "The diversity of life is made up not only of the diversity of plants and animal species, habitats and ecosystems found on the planet, but also of the diversity of human cultures and languages." Research has linked biocultural diversity to the resilience of social-ecological systems. Certain geographic areas have been positively correlated with high levels of biocultural diversity, including those of low latitudes, higher rainfalls, higher temperatures, coastlines, and high altitudes. A negative correlation is found with areas of high latitudes, plains, and drier climates. Positive correlations can also be found between biological diversity and linguistic diversity, illustrated in the overlap between the distribution of plant diverse and language diverse zones. Social factors, such as modes of subsistence, have also been found to affect biocultural diversity.
Mundari (Munɖari) is a Munda language of the Austroasiatic language family spoken by the Munda tribes in eastern Indian states of Jharkhand, Odisha and West Bengal. It is closely related to Santali. Mundari Bani, a script specifically to write Mundari, was invented by Rohidas Singh Nag. It has also been written in the Devanagari, Odia, Bengali, and Latin writing systems.
Uttar Pradesh is a multilingual state with 3 predominant languages and 26 other languages spoken in the state. The languages of Uttar Pradesh primarily belong to two zones in the Indo-Aryan languages, Central and East.
Terralingua is a 501(c)(3) non-profit organization under U.S. tax law (#38–3291259) and a registered non-profit society in Canada based on Salt Spring Island in Vancouver, British Columbia whose mission is to support the integrated protection, maintenance and restoration of the biocultural diversity of life. Created in 1996, Terralingua's founders Luisa Maffi and Dave Harmon pioneered the concept and field of Biocultural Diversity, building on emergent ideas about the links between biological and cultural diversity.
Alorese is an Austronesian language spoken on Alor and the neighboring islands of the Alor archipelago in eastern Indonesia. It is not to be confused with non-Austronesian (Papuan) languages of the Alor–Pantar family which are also spoken in this region. It is also distinct from Alor Malay, a Malay variety which is currently supplanting Alorese as the language of wider communication in the region. Alorese is the native language of several immigrant communities located along the coast of the Alor archipelago, especially at Alor Kecil on Alor and at Baranusa and Marica on Pantar. It has also been used extensively as a trade language in the region.
Remontado, also known in literature as Sinauna, Kabalat, Remontado Dumagat, and more commonly by the autonym Hatang Kayi, is a Malayo-Polynesian language spoken in Tanay, Rizal, General Nakar, Quezon, Rodriguez, Rizal and Antipolo, in the Philippines. It is one of the Philippine Negrito languages. It is a moribund language.
Iyasa is a Bantu language spoken in Cameroon and Equatorial Guinea by the Iyasa and Ndowe coastal fishing peoples. It is also spoken by Pygmies, perhaps Babongo, in Gabon. Approximately 3,000 people speak Iyasa, though some note that this number may be an overestimation.
Sinasina is a term used to refer to for several Chimbu–Wahgi language varieties of Tabare Rural LLG, Simbu Province, Papua New Guinea. The term 'Sinasina' as a language name is an exonym. Speakers of the varieties of this region instead refer to their languages with tok ples vernacular languages endonyms, including: Dinga, Gunangi, Kebai, Kere, Kondo, Nimai, Tabare. The Kere community also has a deaf sign language, Sinasina Sign Language.
The Tutong language, also known as Basa Tutong, is a language spoken by approximately 17,000 people in Brunei. It is the main language of the Tutong people, the majority ethnic group in the Tutong District of Brunei.
Dupaningan Agta, or Eastern Cagayan Agta, is a language spoken by a semi-nomadic hunter-gatherer Negrito people of Cagayan and Isabela provinces in northern Luzon, Philippines. Its Yaga dialect is only partially intelligible.
Casiguran Dumagat Agta, also known as Casiguran Agta, is a Northeastern Luzon language spoken in the northern Philippines. It is spoken by around 610 speakers, most of whom live in the San Ildefonso Peninsula, across the bay from Casiguran, Aurora.
Sinasian Sign Language (SSSL) is a village sign language of the Sinasina valley in Chimbu Province, Papua New Guinea. This language is used by approximately 3 deaf and 50 hearing individuals, including members of the Kere community. SSSL was first encountered and reported by linguist Samantha Rarrick in 2016. Documentation efforts are ongoing.
Peter K. Norquest is an American linguist who specializes in Kra–Dai historical linguistics.