Advanced search
1 file | 2.41 MB

Sub-fossil Chironomidae from East Africa, 2: Chironominae (Chironomini and Tanytarsini)

Hilde Eggermont (UGent) and Dirk Verschuren (UGent)
(2004) JOURNAL OF PALEOLIMNOLOGY. 32(4). p.413-455
Author
Organization
Abstract
This paper and a companion article present illustrated guides to the identification of sub-fossil chironomid larvae (Insecta: Diptera: Chironomidae) preserved in the sediments of low- and mid-elevation lakes in East Africa. They are based on analysis of surface-sediment death assemblages from 61 lakes located in the humid to semi-arid environments in equatorial East Africa (Uganda, Kenya, Tanzania), supplemented with similar surface-sediment samples from 12 lakes in the Horn of Africa (Ethiopia), and sub-recent core samples from six lakes in Kenya and two in Uganda. We analyzed about 11,000 specimens and identified 98.4% of these to species, species group, genus, or tribe level, depending on current alpha-taxonomic knowledge of the various considered genera and the taxonomic resolution of preserved diagnostic features. We distinguished 90 different sub-fossil morphotypes, of which 16 are Tanypodinae, 19 are Orthocladiinae, and 55 are Chironominae. In this paper we focus on the subfamily Chironominae (tribes Chironomini and Tanytarsini). The diagnostic characters distinguishing these morphotypes from each other resemble differences at the species level in the better-known Holarctic fauna, hence we consider most of our morphotypes equivalent to morphological species or groups of closely related species. Given that core samples yielded only seven morphotypes not also found in the surface-sediment samples, the current inventory of 90 taxa likely represents the large majority of distinct sub-fossil chironomid larval types to be found in East African lakes, excluding the few very large Rift lakes, cold-water lakes above treeline, and special standing-water environments such as fens and bogs. Consistent use of a single set of morphological characters to identify both fossil and living chironomid larvae would ensure exchangeability of information between modem and paleoenvironmental studies on aquatic invertebrate communities in African lakes, and increase the relevance of paleoenvironmental reconstructions to water-quality evaluations aimed at sustainable management of scarce, fluctuating surface-water resources in tropical East Africa.
Keywords
Chironomidae, Africa, Chironomini, lake benthos, Orthocladiinae, paleoenvironmental reconstruction, paleolimnology, Tanytarsini, Taxonomy, SUBFOSSIL CHIRONOMIDAE, LAKE VICTORIA, POLYPEDILUM KIEFFER, RIFT-VALLEY, DIPTERA, FAUNA, CHARACTERS, TANGANYIKA, ORGANISMS, SEDIMENTS

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 2.41 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Eggermont, Hilde, and Dirk Verschuren. 2004. “Sub-fossil Chironomidae from East Africa, 2: Chironominae (Chironomini and Tanytarsini).” Journal of Paleolimnology 32 (4): 413–455.
APA
Eggermont, H., & Verschuren, D. (2004). Sub-fossil Chironomidae from East Africa, 2: Chironominae (Chironomini and Tanytarsini). JOURNAL OF PALEOLIMNOLOGY, 32(4), 413–455.
Vancouver
1.
Eggermont H, Verschuren D. Sub-fossil Chironomidae from East Africa, 2: Chironominae (Chironomini and Tanytarsini). JOURNAL OF PALEOLIMNOLOGY. 2004;32(4):413–55.
MLA
Eggermont, Hilde, and Dirk Verschuren. “Sub-fossil Chironomidae from East Africa, 2: Chironominae (Chironomini and Tanytarsini).” JOURNAL OF PALEOLIMNOLOGY 32.4 (2004): 413–455. Print.
@article{304436,
  abstract     = {This paper and a companion article present illustrated guides to the identification of sub-fossil chironomid larvae (Insecta: Diptera: Chironomidae) preserved in the sediments of low- and mid-elevation lakes in East Africa. They are based on analysis of surface-sediment death assemblages from 61 lakes located in the humid to semi-arid environments in equatorial East Africa (Uganda, Kenya, Tanzania), supplemented with similar surface-sediment samples from 12 lakes in the Horn of Africa (Ethiopia), and sub-recent core samples from six lakes in Kenya and two in Uganda. We analyzed about 11,000 specimens and identified 98.4\% of these to species, species group, genus, or tribe level, depending on current alpha-taxonomic knowledge of the various considered genera and the taxonomic resolution of preserved diagnostic features. We distinguished 90 different sub-fossil morphotypes, of which 16 are Tanypodinae, 19 are Orthocladiinae, and 55 are Chironominae. In this paper we focus on the subfamily Chironominae (tribes Chironomini and Tanytarsini). The diagnostic characters distinguishing these morphotypes from each other resemble differences at the species level in the better-known Holarctic fauna, hence we consider most of our morphotypes equivalent to morphological species or groups of closely related species. Given that core samples yielded only seven morphotypes not also found in the surface-sediment samples, the current inventory of 90 taxa likely represents the large majority of distinct sub-fossil chironomid larval types to be found in East African lakes, excluding the few very large Rift lakes, cold-water lakes above treeline, and special standing-water environments such as fens and bogs. Consistent use of a single set of morphological characters to identify both fossil and living chironomid larvae would ensure exchangeability of information between modem and paleoenvironmental studies on aquatic invertebrate communities in African lakes, and increase the relevance of paleoenvironmental reconstructions to water-quality evaluations aimed at sustainable management of scarce, fluctuating surface-water resources in tropical East Africa.},
  author       = {Eggermont, Hilde and Verschuren, Dirk},
  issn         = {0921-2728},
  journal      = {JOURNAL OF PALEOLIMNOLOGY},
  keyword      = {Chironomidae,Africa,Chironomini,lake benthos,Orthocladiinae,paleoenvironmental reconstruction,paleolimnology,Tanytarsini,Taxonomy,SUBFOSSIL CHIRONOMIDAE,LAKE VICTORIA,POLYPEDILUM KIEFFER,RIFT-VALLEY,DIPTERA,FAUNA,CHARACTERS,TANGANYIKA,ORGANISMS,SEDIMENTS},
  language     = {eng},
  number       = {4},
  pages        = {413--455},
  title        = {Sub-fossil Chironomidae from East Africa, 2: Chironominae (Chironomini and Tanytarsini)},
  url          = {http://dx.doi.org/10.1007/s10933-004-0327-2},
  volume       = {32},
  year         = {2004},
}

Altmetric
View in Altmetric
Web of Science
Times cited: