Abstract booklet - gtö – Society for Tropical Ecology

52 PARALLEL SESSION | H III | TROPICAL AQUATIC ECOSYSTEMSPARALLEL SESSION | H III | TROPICAL AQUATIC ECOSYSTEMS 53CONSERVATION OF ENDEMIC EXTREMOPHILE LIVEBEARING FISHESFROM SULFIDIC HABITATS IN SOUTHERN MEXICODavid Bierbach 1 , Martin Plath 11University of Frankfurt, Frankfurt/Main, DE, david.bierbach@gmx.deHELMINTHES INFESTATION OF CLARIAS BATRACHUS (LINNAEUS,1758) AND CLARIAS MACROCEPHALUS (GUNTER,1864):COMPARISON OF THE SMALL RIVER AND MEKONG DELTA HABITATSElena Mishina 1 , Nguyễn Thị Hải Thanh 2 , Alexander Zhokhov 1TUESDAY 11:30 Hall H IIILocal adaptation to divergent environmental conditions can promotepopulation genetic differentiation even in the absence of geographic barriersand hence, lead to (ecological) speciation. In southern Mexico (Tabasco andChiapas), various populations of livebearing fishes occur endemically in smallhabitat patches with high concentrations of hydrogen sulfide, which is ofvolcanic origin. While some forms are phylogenetically old and represent distinctspecies (like Gambusia eurystoma or Poecilia sulphuraria), other populations areen route to speciation (i.e., have not yet achieved full reproductive isolationfrom related populations in adjacent non-toxic environments). We exemplifythe diversity of unique adaptations in different sulfide-adapted ecotypes andhighlight problems related to the conservation of the various evolutionarilysignificant units (‘ESUs’), especially phylogenetically young forms. Specifically,we will use the genus Poecilia (mollies) as an example and show convergentmorphological and behavioural adaptations to life in sulfidic habitats, providea phylogenetic framework to reconstruct their independent evolution indifferent river drainages, and specify whether and how different populationsare nowadays threatened by human activities.Merian Award Winner 20111IBIW RAS, Borok, RU, mishinael@gmail.com, 2 Russian-Vietnam Tropical Centre,Coastal Branch, Nha Trang, VietnamRiver Cai is situated in Khanh Hoa Province in the Central Vietnam. Its drainagearea is about 1450 km2, amd its length is about 70 km. Fish’s helminthes of riverCai have been studied from January to May 2008 -2009. Fishes were collectedat the upper and lower reaches of river Cai. Another river, river Hau, that hasbeen investigated for helminth’ fauna is one of the channels of the Mekong riverlocalised in its delta. 111 specimens of Clarias batrachus were studied in theriver Cai and 49 fishes were investigated in the river Hau. 54 fishes of Clariasmacrocephalus were collected in the river Hau. A total number of 15 speciesof helminthes were identified: Cestoda – 7 species, Trematoda – 4, Nematoda– 3, Acanthocephala – 1. Six species of helminthes (Lytocestus assamensis,Lytocestus sp., Macroderoides sp.1, Phyllodistomum sp., Procamallanus clarius andPallisentis sp.) were found in all fishes. Djombangia penetrans was observed inboth catfishes from the Hau river. Markewitschia sp. and Masenia sp. were foundin Cl. batrachus from the Hau river only. 2 species of nematodes (Cammalanuscf. lacustris and Contracaecum sp. larva) were found in Сl. macrocephalus only.Monobotrium sp., Bovienia sp., Macroderoides sp.2 were identified in Cl. batrachusfrom the river Cai. The maximum intensity of helminthes for all fishes was foundin intestines. The Caryophyllidea prevailed in all studied fishes in number ofspecies, intensity and infestation (%). Maximal number of taxa of helmintheswere revealed in Cl. batrachus from the river Hau. Minimal species richness ofparasites was observed in Сl. macrocephalus.TUESDAY 11:45 Hall H IIIgtöSociety for Tropical Ecology | Gesellschaft für Tropenökologie e.V. Status and future of tropical biodiversity | Frankfurt, 21 - 24 February 2011gtö