Abundance, distribution, and territory areas of rock-dwelling Lake Tanganyika cichlid fish species

  • Christian Sturmbauer
  • Corinna Fuchs
  • Georg Harb
  • Elisabeth Damm
  • Nina Duftner
  • Michaela Maderbacher
  • Martin Koch
  • Stephan Koblmüller
Conference paper

DOI: 10.1007/978-1-4020-9582-5_5

Part of the Developments in Hydrobiology book series (DIHY, volume 205)
Cite this paper as:
Sturmbauer C. et al. (2008) Abundance, distribution, and territory areas of rock-dwelling Lake Tanganyika cichlid fish species. In: Wilke T., Väinölä R., Riedel F. (eds) Patterns and Processes of Speciation in Ancient Lakes. Developments in Hydrobiology, vol 205. Springer, Dordrecht

Abstract

Lake Tanganyika, the second-oldest and second-deepest lake in the world, harbors an impressive cichlid fish fauna counting about 250 endemic species that are characterized by a great level of ecological, morphological, and behavioral specialization. This study describes and compares cichlid fish communities at two rocky shores with differential human impact in the south of Lake Tanganyika. Species inventories and depth-dependent abundances were elaborated. About 41 and 46 sympatric cichlid species were recorded in the two study sites, respectively. Variabilichromis moorii was the most abundant species (29–60% of total number of fishes), followed by Aulonocranus dewindti (3–19%), Tropheus moorii (12%), Ophthalmotilapia ventralis (4–10%), Eretmodus cyanostictus (6–11%), and Cyathopharynx furcifer (0.01–9%). All other species had abundances below 5%. It further emerged that large cichlids such as Petrochromis species, Cyathopharynx furcifer, and Lobochilotes labiatus were very rare at one location, with frequencies of 0.55% or less. Territorial sizes of three particularly abundant species, Variabilichromis moorii, Aulonocranus dewindti, and Tropheus moorii, were assessed by behavioral observations. We distinguished between territorial core areas and total defended area, yielding average core areas between 0.4 (V. moorii) and 1.6 m2 (T. moorii), and total defended areas averaging for each species between 1.6 (V. moorii) and 5.0 m2(A. dewindti) with no significant differences between the two study sites. The data on individual densities are also relevant for evolutionary studies, in that they allow more accurate calculations of effective population sizes.

Keywords

Aulonocranus dewindti Tropheus moorii Variabilichromis moorii Ecology Fish community Territorial behavior Eastern Africa 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Christian Sturmbauer
    • 1
  • Corinna Fuchs
    • 1
  • Georg Harb
    • 1
  • Elisabeth Damm
    • 1
  • Nina Duftner
    • 1
    • 2
  • Michaela Maderbacher
    • 1
  • Martin Koch
    • 1
  • Stephan Koblmüller
    • 1
  1. 1.Department of ZoologyUniversity of GrazGrazAustria
  2. 2.Section of Integrative BiologyUniversity of Texas at AustinAustinUSA

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