Bartholy et al. (2012) Applied Ecology and Environmental Research

Bartholy, J., Pongrácz, R., Nagy, J., Pieczka, I., Hufnagel, L. (2012): Regional climate change impacts on wild animals’ living territory in Central Europe. Applied Ecology and Environmental Research 10(2): 107-120.


Abstract
In this paper the projected future impact of climate change has been analyzed for the quality of living conditions of the European terrestrial vertebrates (amphibians, reptiles, birds, mammals) in the Carpathian Basin. According to the climate scenarios, warmer and drier climatic conditions are likely to occur in the Carpathian Basin by end of this century. Simultaneous analysis of climate parameters, climate simulations and animal range datasets enables us to evaluate the vulnerability of different European species to regional warming and climate change. The spatial climate analogy technique is used to analyze the estimated rapid change of the wild animals’ habitats and their northward migration. For the reference climate data of Debrecen is considered, and three spatial analogue regions are compared. The results suggest that generally a significant decline in habitats is very likely for most of the analyzed animal groups by the end of the 21st century. The largest rate of decline is estimated for birds. However, living conditions for reptiles may improve in the future due to the warmer and drier climatic conditions, which are favourable for these species.

Keywords

spatial analogy, climate change, vertebrates species, ecology, area dynamics

Sipkay et al. (2012) Biologia

Csaba Sipkay, Tihamér Kiss-Keve, Csaba Vadadi-Fülöp, Réka Homoródi and Levente Hufnagel (2012): Simulation modeling of phytoplankton dynamics in a large eutrophic river, Hungary — Danubian Phytoplankton Growth Model (DPGM). Biologia(Bratislava) Section Botany, 67(2): 323-337. DOI: 10.2478/s11756-012-0004-2


Abstract
Ecological models have often been used in order to answer questions that are in the limelight of recent researches such as the possible effects of climate change. The methodology of tactical models is a very useful tool comparison to those complex models requiring relatively large set of input parameters. In this study, a theoretical strategic model (TEGM) was adapted to the field data on the basis of a 24-year long monitoring database of phytoplankton in the Danube River at the station of Göd, Hungary (at 1669 river kilometer - hereafter referred to as “rkm”). The Danubian Phytoplankton Growth Model (DPGM) is able to describe the seasonal dynamics of phytoplankton biomass (mg L−1) based on daily temperature, but takes the availability of light into consideration as well. In order to improve fitting, the 24-year long database was split in two parts in accordance with environmental sustainability. The period of 1979–1990 has a higher level of nutrient excess compared with that of the 1991–2002. The authors assume that, in the above-mentioned periods, phytoplankton responded to temperature in two different ways, thus two submodels were developed, DPGM-sA and DPGM-sB. Observed and simulated data correlated quite well. Findings suggest that linear temperature rise brings drastic change to phytoplankton only in case of high nutrient load and it is mostly realized through the increase of yearly total biomass.

Keywords

climate change, ecological model, nutrient load, tactical modeling

Vadadi-Fülöp et al. (2012) Aquatic Ecology

Csaba Vadadi-Fülöp, Csaba Sipkay, Gergely Mészáros and Levente Hufnagel (2012): Climate change and freshwater zooplankton: what does it boil down to? Aquatic Ecology 46(4): 501-519. DOI: 10.1007/s10452-012-9418-8


Abstract
Recently, major advances in the climate-zooplankton interface have been made some of which appeared to receive much attention in a broader audience of ecologists as well. In contrast to the marine realm, however, we still lack a more holistic summary of recent knowledge in freshwater. We discuss climate change-related variation in physical and biological attributes of lakes and running waters, high-order ecological functions, and subsequent alteration in zooplankton abundance, phenology, distribution, body size, community structure, life history parameters, and behavior by focusing on community level responses. The adequacy of large-scale climatic indices in ecology has received considerable support and provided a framework for the interpretation of community and species level responses in freshwater zooplankton. Modeling perspectives deserve particular consideration, since this promising stream of ecology is of particular applicability in climate change research owing to the inherently predictive nature of this field. In the future, ecologists should expand their research on species beyond daphnids, should address questions as to how different intrinsic and extrinsic drivers interact, should move beyond correlative approaches toward more mechanistic explanations, and last but not least, should facilitate transfer of biological data both across space and time.


Keywords
Global warming, Daphnia, Phenology, Community dynamics, Ecological models

Horváth et al. (2012) Ecological Research

Horváth R., Magura T. & Tóthmérész B. (2012) Ignoring ecological demands masks the real effect of urbanization: a case study of ground-dwelling spiders along a rural-urban gradient in a lowland forest in Hungary. Ecological Research 27(6): 1069-1077. DOI: 10.1007/s11284-012-0988-7


Abstract
We studied ground-dwelling spiders along a rural-suburban-urban forest gradient representing increasing human disturbance using pitfall traps. We tested four known and two novel hypotheses: (1) increasing disturbance hypothesis (species richness is decreasing by disturbance); (2) matrix species hypothesis (the richness of open-habitat species is increasing by disturbance); (3) opportunistic species hypothesis (the richness of generalist species is increasing by disturbance); and (4) habitat specialist hypothesis (the number of the forest specialist species is decreasing by disturbance). As a consequence of urbanization, urban forests become drier and more open; thus, according to the new hypotheses, the number of (5) xerophilous species and (6) light-preferring species are increasing in the urban area. Our result did not support the increasing disturbance hypothesis, as the overall species richness increased from the rural sites to the urban ones. As predicted, the number of both the open-habitat and the generalist species increased towards the urban sites. The number of forest specialist species was higher in the suburban area than in the rural and urban area. Both xerophilous and light-preferring species were the most numerous in the urban area, supporting the xerophilous species and the light-preferring species hypotheses. Canonical correspondence analysis showed that the forest specialist species associated with the rural sites with higher amounts of decaying woods and more herbs or with the suburban sites with higher cover of leaf litter and higher relative humidity. Two generalist species and one open-habitat species were characteristic of urban sites with higher ground surface and air temperature.


Keywords
Globenet, Disturbance, Xerophilous species, Light-preferring species, Environmental factors

Szövényi et al. (2012) Molecular Ecology

Szövényi, P., Sundberg, S. and Shaw, A. J. (2012), Long-distance dispersal and genetic structure of natural populations: an assessment of the inverse isolation hypothesis in peat mosses. Molecular Ecology, 21: 5461–5472. doi: 10.1111/mec.12055


Abstract
It is well accepted that the shape of the dispersal kernel, especially its tail, has a substantial effect on the genetic structure of species. Theory predicts that dispersal by fat-tailed kernels reshuffles genetic material, and thus, preserves genetic diversity during colonization. Moreover, if efficient long-distance dispersal is coupled with random colonization, an inverse isolation effect is predicted to develop in which increasing genetic diversity per colonizer is expected with increasing distance from a genetically variable source. By contrast, increasing isolation leads to decreasing genetic diversity when dispersal is via thin-tailed kernels. Here, we use a well-established model group for dispersal biology (peat mosses: genus Sphagnum) with a fat-tailed dispersal kernel, and the natural laboratory of the Stockholm archipelago to study the validity of the inverse isolation hypothesis in spore-dispersed plants in island colonization. Population genetic structure of three species (Sphagnum fallax, Sphagnum fimbriatum and Sphagnum palustre) with contrasting life histories and ploidy levels were investigated on a set of islands using microsatellites. Our data show (, amova, IBD) that dispersal of the two most abundant species can be well approximated by a random colonization model. We find that genetic diversity per colonizer on islands increases with distance from the mainland for S. fallax and S. fimbriatum. By contrast, S. palustre deviates from this pattern, owing to its restricted distribution in the region, affecting its source pool strength. Therefore, the inverse isolation effect appears to hold in natural populations of peat mosses and, likely, in other organisms with small diaspores.



Keywords
genetic structure,inverse isolation hypothesis,island colonization,long-distance dispersal,  Sphagnum

Scheuring & Douglas (2012) Ecology Letters

Scheuring, I., Douglas, W.Y. (2012) How to assemble a beneficial microbiome in three easy steps. Ecology Letters (2012) 15: 1300–1307. DOI: 10.1111/j.1461-0248.2012.01853.x


Abstract
There is great interest in explaining how beneficial microbiomes are assembled. Antibiotic-producing microbiomes are arguably the most abundant class of beneficial microbiome in nature, having been found on corals, arthropods, molluscs, vertebrates and plant rhizospheres. An exemplar is the attine ants, which cultivate a fungus for food and host a cuticular microbiome that releases antibiotics to defend the fungus from parasites. One explanation posits long-term vertical transmission of Pseudonocardia bacteria, which (somehow) evolve new compounds in arms-race fashion against parasites. Alternatively, attines (somehow) selectively recruit multiple, non-coevolved actinobacterial genera from the soil, enabling a multi-drug strategy against parasites. We reconcile the models by showing that when hosts fuel interference competition by providing abundant resources, the interference competition favours the recruitment of antibiotic-producing (and -resistant) bacteria. This partner-choice mechanism is more effective when at least one actinobacterial symbiont is vertically transmitted or has a high immigration rate, as in disease-suppressive soils.


Keywords
Actinomycetes, antibiotics, Attini, game theory, horizontal transmission, microbiome, mutualism, screening, Streptomyces, symbiosis

Ferincz et al. (2012) Acta Zoologica Academiae Scientiarum Hungaricae

Ferincz, Á., Staszny, Á., Ács, A., Weiperth, A., Tátrai, I. and Paulovits, G. (2012): Long-term development of fish assemblage in Lake Fenéki (Kis-Balaton Water Protection System, Hungary): succession, invasion and stabilization. Acta Zoologica Academiae Scientiarum Hungaricae 58 (Supplement 1): 3–18.

Abstract

This analysis of long-term (1992–2011) changes in the fish assemblage of the partially operating shallow, hypertrophic reservoir (Ingói-marsh, Lake Fenéki) was carried out on the occasion of the planned completion of the impoundment. Samplings were performed in standard localities with electrofishing. Three phases could be distinguished in fish fauna development. The first phase is characterized by two allochtonous marsh-species: the Mud-minnow (Umbra krameri) and the Crucian carp (Carassius carassius), and was fast replaced by the second invasion phase, characterized by the invasion of non-native gibel carp (Carassius gibelio),and the third phase by the dominance of roach (Rutilus rutilus) and bleak (Alburnus alburnus). The cumulative relative abundance of non-indigenous species reached a peak in the third year of the impoundment (1995; 56.4%), and remained high (>>50%) until 2001. The number of species, Shannon-Weaver diversity, and relative abundance of piscivorous species correlated positively with the age of reservoir. The shift of the fish fauna between the two phases was dynamic and dramatic, since the all previously dominant species disappeared within 4 years. The impact of invasive gibel carp is considered as high, because it has completely replaced its native relative (C. carassius), but in the other hand it only was able to delay the natural successive process, not completely transform it.

 

Keywords

gibel carp, diversity, assemblage structure, shallow reservoir