Long‐term air temperature changes in a Central European sedge‐grass marsh

Abstract

In this study, we have analysed the series of daily air temperatures from 1977 to 2009 measured in a sedge‐grass marsh ecosystem near the town of Třeboň, Czech Republic (Central Europe). Annual averages of daily mean, minimum and maximum temperatures were analysed. Possible significant increases were recorded for all these values during the study period. The annual average of daily maximum temperatures increased on average by 0.0827 °C per year. The annual average of daily mean air temperatures increased by 0.0544 °C per year. The rise of the annual average of daily minimum air temperature was the lowest, namely by 0.0374 °C per year. The air temperature rise was not the same in all periods of the year, and different increases were found in individual months. The daily mean air temperature rose significantly in the growing season (April–August). In all the other months except December, a statistically non‐significant rise of daily mean air temperatures was recorded. From the ecological point of view, the different monthly increases are more important for the wetland ecosystem than the slow gradual rise of air temperature over the years. The air temperature rise recorded in the wetland studied was lower than that predicted by climatic models. Copyright © 2012 John Wiley & Sons, Ltd.

Long-term trends, total numbers and species richness of increasing waterbird populations at sites on the edge of their winter range: cold-weather refuge sites are more important than protected sites

“…Moreover, we expect changes in the geographical position of this line to affect the continental availability of wetlands to wintering waterbirds. At the present time, long-term January temperatures do not show any significant trends in the study area, in contrast to the observed trend for increasing monthly temperatures in the period from April up to and including August (Dušek et al 2012). Similarly, we assume a higher importance to sufficient running water and sites with a higher proportion of urban areas and other wetlands in their surroundings, which we consider as variables that reduce the effect of winter harshness.…”

“…Central European wetlands would seem to offer less suitable conditions for wintering waterbirds, but, to the contrary, the importance of these sites have been increasing over the last decades (Keller 2011;Fox et al 2010;Musil et al 2011;Slabeyová et al 2014), no doubt due to the changing environment generating variation in critical factors, such as weather (Goss-Custard et al 1994;Sutherland 1998). However, significant changes in winter temperatures are more apparent in some other parts of the same wintering flyway, as exemplified by the increasing numbers in Finland , Pavón-Jordán et al 2015, whereas in our study area the long-term January temperatures seem to be remaining stable (Musilová et al 2009;Dušek et al 2012). Many species can be expected to survive climate change as long as they are able to colonize new regions (Thomas et al 2012).…”

Modeling of Soil Co2 Efflux During Water Table Fluctuation Based on in Situ Measured Data From a Sedge-Grass Marsh

“…The sedge-grass marsh (location of the meteorological station is 49°01′ 29" N, 14°46′13" E) is a flat area at an altitude of 426.5 m above sea level. The mean annual air temperature and mean annual precipitation, for a 35-year period between 1977 and 2011, were 7.6 °C and 614 mm, respectively (Dusek et al, 2012b). For previous ecological studies that focused on the "Wet Meadows" sedge-grass marsh site see Jenik and Kvet (1983) and Kvet et al (Holubickova, 1959;Gazda, 1983;Prach, 1993;Prach and Soukupova, 2002;Prach, 2008).…”