Morphological variations of wild populations of Nile tilapia (Oreochromis niloticus) living in extreme environmental conditions in the Kenyan Rift-Valley
| Autor: | Jean-François Agnèse, Titus Chemandwa Ndiwa, Julien Claude, Dorothy Wanja Nyingi |
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| Přispěvatelé: | Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226 |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine Morphometrics biology Ecology [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] Turtle (syntax) 15. Life on land Aquatic Science Crocodile biology.organism_classification 010603 evolutionary biology 01 natural sciences Salinity 03 medical and health sciences Nile tilapia Oreochromis 030104 developmental biology biology.animal [SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology Allometry ComputingMilieux_MISCELLANEOUS Ecology Evolution Behavior and Systematics Rift valley |
| Zdroj: | Environmental Biology of Fishes Environmental Biology of Fishes, Springer, 2016, 99 (5), pp.473-485. ⟨10.1007/s10641-016-0492-y⟩ |
| ISSN: | 1573-5133 0378-1909 |
| DOI: | 10.1007/s10641-016-0492-y |
| Popis: | In this study, we use geometric morphometric method to establish morphological differences between natural populations of Nile tilapia from two extreme environmental conditions (high temperature and salinity) in Kenya, and compare them to two populations from regions experiencing less extreme conditions. To determine genetic influence on morphology, we correlated genetic data with morphological data. The study observed significant morphological differences between all studied populations, including three closely related hot spring populations (Bogoria, Chelaba and Turtle Springs), and two populations with similar genetic background inhabiting saline environments in Lake Turkana basin (Turkana and Crocodile Lake populations). In addition, allometric growth patterns of the seven populations differed significantly, demonstrating that developmental changes (plastic or adaptive) operated between these populations. Positive correlation between morphometric and genetic data confirmed the influence of genetic factors on morphology. All observed differences were attributed either to genetic and/or environmental factors, which seemed to play a major role in influencing morphology of wild Nile tilapia populations. We recommend further studies to be carried out under controlled conditions to confirm the role of temperature, pH and salinity in morphological diversification of Nile tilapia. |
| Databáze: | OpenAIRE |
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