“…However, some chironomid species show specific habitat preferences (Rae, 1985, 1987). Admittedly, the relationships between chironomid biodiversity and environmental factors are well known only from low order stream sections, yet the present data seem to indicate similar processes also in large rivers (Gaschignard and Berly, 1987; Grzybkowska, 1991; Bournaud et al ., 1998; Franquet, 1999; Fesl, 2002; Schöll and Haybach, 2004).…”
The impact of a large lowland temperate zone reservoir on chironomid and fish biodiversity was investigated in the same upstream (U) and downstream (D) sites on the same sampling occasions in spring and autumn of several post-impoundment years. The true/Hill N1 diversity measure was used to construct diversity models of the impact, and partitioning of N1 to reveal the importance of ecological gradients. N1 is unique in being decomposable among multiple levels and easily comparable across ecosystems and animal groups.Chironomids were more diverse than fish in all community sets owing to their probably lower mobility, lower interspecific competition, opportunistic character and much shorter life spans than those of fish. Fish exerted consumption pressure on chironomids upstream by foraging mostly on benthic insects, but not downstream where they fed on microcrustaceans of reservoir origin or on epiphytic fauna (mainly Chironomidae).The reservoir impact on chironomids decreased their diversity in U and increased in D, while much the opposite was true in fish. In D in macroinvertebrates, the impact consisted in advancing over time intensification of seasonal development of submersed macrophytes, while in D in fish in a few species escaping from the reservoir after their populational explosions each year.Partitioning of diversity revealed that the spatial (upstream-downstream) gradient was the strongest factor of diversity change in chironomids as compared with season, and age of the impoundment. No gradient was dominant in fish. Comparisons of observed data with a null model testified to very strong intraspecific aggregation in both chironomids and fish.
“…However, some chironomid species show specific habitat preferences (Rae, 1985, 1987). Admittedly, the relationships between chironomid biodiversity and environmental factors are well known only from low order stream sections, yet the present data seem to indicate similar processes also in large rivers (Gaschignard and Berly, 1987; Grzybkowska, 1991; Bournaud et al ., 1998; Franquet, 1999; Fesl, 2002; Schöll and Haybach, 2004).…”
The impact of a large lowland temperate zone reservoir on chironomid and fish biodiversity was investigated in the same upstream (U) and downstream (D) sites on the same sampling occasions in spring and autumn of several post-impoundment years. The true/Hill N1 diversity measure was used to construct diversity models of the impact, and partitioning of N1 to reveal the importance of ecological gradients. N1 is unique in being decomposable among multiple levels and easily comparable across ecosystems and animal groups.Chironomids were more diverse than fish in all community sets owing to their probably lower mobility, lower interspecific competition, opportunistic character and much shorter life spans than those of fish. Fish exerted consumption pressure on chironomids upstream by foraging mostly on benthic insects, but not downstream where they fed on microcrustaceans of reservoir origin or on epiphytic fauna (mainly Chironomidae).The reservoir impact on chironomids decreased their diversity in U and increased in D, while much the opposite was true in fish. In D in macroinvertebrates, the impact consisted in advancing over time intensification of seasonal development of submersed macrophytes, while in D in fish in a few species escaping from the reservoir after their populational explosions each year.Partitioning of diversity revealed that the spatial (upstream-downstream) gradient was the strongest factor of diversity change in chironomids as compared with season, and age of the impoundment. No gradient was dominant in fish. Comparisons of observed data with a null model testified to very strong intraspecific aggregation in both chironomids and fish.
“…Recently re-found native species also include larvae of the gomphid dragonflies Gomphus vulgatissimus and G. flavipes in groyne fields. The change from gravel to sand coincides with the occurrence of species able to cope with the moving sand dunes such as the chironomids Kloosia pusilla and Robackia demeijeri, and the oligochaete Propappus volki (IKSR 2002a;Sch€ oll & Haybach 2004).…”
“…In addition to being key to freshwater and riparian ecosystems (e.g., Porinchu and MacDonald 2003 ; Paetzold et al 2005 ), chironomids have been widely used to recreate the environmental history of lakes and rivers (e.g., Plikk et al 2019 ), generate typologies (e.g., Schöll and Haybach 2004 ; Nyman and Korhola 2005 ), propose biogeographical hypotheses (e.g., Brundin 1966 ; Krosch et al 2011 ), ecotoxicological models (e.g., Beleza et al 2019 ; Ferrari et al 2019 ), biomonitoring (e.g., Gomes et al 2018 ; Molineri et al 2020 ) and for the evaluation of taxonomic and functional diversity (e.g., Jyväsjärvi et al 2018 ). However, the Mexican Chironomidae fauna needs to be much better studied before it can be useful in such contexts.…”
An updated checklist of Mexican non-biting midges (Chironomidae) is presented. A total of 110 species of Chironomidae are known for Mexico: 52 species in 25 genera belong to the subfamily Chironominae, 30 species in 13 genera to Orthocladiinae, 21 species in nine genera to Tanypodinae, five species in two genera to Telmatogetoninae, and two species in one genus to Diamesinae. In addition, 41 genera without identified species are listed. The highest number of species (29) is recorded from the state of Campeche, while 19 species have been found in Veracruz and 15 in Nuevo León. Few or no records exist for states in Central and Northern Mexico, or those on the Pacific coast. The type localities for 34 species are in Mexico; of these, 27 species (25% of the total number of species recorded in the country) are endemic. Twenty-nine species recorded in Mexico have a Neotropical distribution, 15 a Nearctic distribution, and 39 species are distributed in both the Neotropical and Nearctic regions or more widely. It has been suggested that as many as 1000 species might occur in Mexico; so only a little more than 10% of the expected diversity has so far been recorded.
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