Erik Jeppesen

TY - JOUR

T1 - Influences of climate and nutrient enrichment on the multiple trophic levels of Turkish shallow lakes

AU - Beklioğlu, Meryem

AU - Bucak, Tuba

AU - Levi, Eti E.

AU - Erdoğan, Şeyda

AU - Özen, Arda

AU - Filiz, Nur

AU - Bezirci, Gizem

AU - Çakıroğlu, Ayşe İdil

AU - Tavşanoğlu, Nihan

AU - Gökçe, Didem

AU - Demir, Nilsun

AU - Özuluğ, Müfit

AU - Duran, Mustafa

AU - Özkan, Korhan

AU - Brucet, Sandra

AU - Jeppesen, Erik

PY - 2020

Y1 - 2020

N2 - Climate warming threatens the structure and function of shallow lakes, not least those in the Mediterranean climate. We used a space-for-time substitution approach to assess the response of trophic and community structures as well as the richness and evenness of multiple trophic levels to temperature, hydrological, and nutrient constraints. We selected 41 lakes covering wide climatic, hydrological, and nutrient gradients within a short distance for reducing the effect of biogeographical factors in the western Anatolian plateau of Turkey. Generalized linear model analyses revealed that temperature was overall the most important driving variable, followed by total nitrogen (TN) and salinity. The chlorophyll a:total phosphorus ratio, the cyanobacteria:total phytoplankton biovolume ratio, the fish:zooplankton biomass ratio, the proportion of small fish, and fish richness increased with increasing temperature, whereas macrophyte plant volume inhabited (PVI, %), richness, and evenness decreased. Grazing pressure, macrophyte coverage, piscivore biomass, phytoplankton richness, and evenness decreased significantly with both increasing TN and temperature. Temperature and nutrients also separated the northern highland lakes from other lakes in a non-metric multidimensional scaling analysis. Additionally, salinity reduced richness and evenness of phytoplankton and zooplankton. Our results indicate major changes in lake structure and functioning with warming and eutrophication, and highlight the need for strict control of nutrients and water use.

AB - Climate warming threatens the structure and function of shallow lakes, not least those in the Mediterranean climate. We used a space-for-time substitution approach to assess the response of trophic and community structures as well as the richness and evenness of multiple trophic levels to temperature, hydrological, and nutrient constraints. We selected 41 lakes covering wide climatic, hydrological, and nutrient gradients within a short distance for reducing the effect of biogeographical factors in the western Anatolian plateau of Turkey. Generalized linear model analyses revealed that temperature was overall the most important driving variable, followed by total nitrogen (TN) and salinity. The chlorophyll a:total phosphorus ratio, the cyanobacteria:total phytoplankton biovolume ratio, the fish:zooplankton biomass ratio, the proportion of small fish, and fish richness increased with increasing temperature, whereas macrophyte plant volume inhabited (PVI, %), richness, and evenness decreased. Grazing pressure, macrophyte coverage, piscivore biomass, phytoplankton richness, and evenness decreased significantly with both increasing TN and temperature. Temperature and nutrients also separated the northern highland lakes from other lakes in a non-metric multidimensional scaling analysis. Additionally, salinity reduced richness and evenness of phytoplankton and zooplankton. Our results indicate major changes in lake structure and functioning with warming and eutrophication, and highlight the need for strict control of nutrients and water use.

KW - drought

KW - elevation

KW - land use

KW - richness

KW - salinity

KW - small fish

UR - http://www.scopus.com/inward/record.url?scp=85085524682&partnerID=8YFLogxK

U2 - 10.1080/20442041.2020.1746599

DO - 10.1080/20442041.2020.1746599

M3 - Journal article

AN - SCOPUS:85085524682

VL - 10

SP - 173

EP - 185

JO - Inland Waters

JF - Inland Waters

SN - 2044-2041

IS - 2

ER -