Vlaanderen.be

Onderzoeksoutput

The heat is on: Genetic adaptation to urbanization mediated by thermal tolerance and body size

Onderzoeksoutput: Bijdrage aan tijdschriftA1: Web of Science-artikelOnderzoekpeer review

Auteurs

  • Kristien I Brans
  • Mieke Jansen
  • Nedim Tüzün
  • Robby Stoks
  • Luc De Meester

Afdelingen, onderzoeksgroepen en diensten

Externe Organisaties

  • Laboratory of Aquatic Ecology, Evolution and Conservation, KU Leuven, Leuven, Belgium.

Details

Originele taal-2Engels
TijdschriftGlobal Change Biology
Volume23
Tijschrift nummer12
Pagina's (van-tot)5218-5227
Aantal pagina's10
ISSN1354-1013
StatusGepubliceerd - dec-2017

Abstract

Worldwide, urbanization leads to tremendous anthropogenic environmental alterations, causing strong selection pressures on populations of animals and plants. Although a key feature of urban areas is their higher temperature ("urban heat islands"), adaptive thermal evolution in organisms inhabiting urban areas has rarely been studied. We tested for evolution of a higher heat tolerance (CTMAX ) in urban populations of the water flea Daphnia magna, a keystone grazer in freshwater ecosystems, by carrying out a common garden experiment at two temperatures (20°C and 24°C) with genotypes of 13 natural populations ordered along a well-defined urbanization gradient. We also assessed body size and haemoglobin concentration to identify underlying physiological drivers of responses in CTMAX . We found a higher CTMAX in animals isolated from urban compared to rural habitats and in animals reared at higher temperatures. We also observed substantial genetic variation in thermal tolerance within populations. Overall, smaller animals were more heat tolerant. While urban animals mature at smaller size, the effect of urbanization on thermal tolerance is only in part caused by reductions in body size. Although urban Daphnia contained higher concentrations of haemoglobin, this did not contribute to their higher CTMAX . Our results provide evidence of adaptive thermal evolution to urbanization in the water flea Daphnia. In addition, our results show both evolutionary potential and adaptive plasticity in rural as well as urban Daphnia populations, facilitating responses to warming. Given the important ecological role of Daphnia in ponds and lakes, these adaptive responses likely impact food web dynamics, top-down control of algae, water quality, and the socio-economic value of urban ponds.

Winkelwagen
Toevoegen aan winkelwagen Opgeslagen in winkelwagen

Kopieer de tekst uit dit veld...

Documenten

Documenten

  • Brans_et_al-2017-Global_Change_Biology

    !!Final published version, 481 KB, PDF-document

DOI

Relaties
Bekijk grafiek van relaties