Local trophic specialisation in a cosmopolitan spider (Araneae)

Zoology ◽  
2013 ◽  
Vol 116 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Eva Líznarová ◽  
Lenka Sentenská ◽  
Luis Fernando García ◽  
Stano Pekár ◽  
Carmen Viera
Keyword(s):  
Trophic Specialisation

Predation of European catfish on anadromous fish species in an anthropised area

2019 ◽  
Vol 70 (5) ◽  
pp. 682 ◽  
Author(s):  
Nicolas Guillerault ◽  
Stéphanie Boulêtreau ◽  
Frédéric Santoul
Keyword(s):  
Prey Species ◽  
Isotope Analysis ◽  
Fish Populations ◽  
Anadromous Fish ◽  
Silurus Glanis ◽  
Dietary Preference ◽  
Fish Predators ◽  
Free Running ◽  
European Catfish ◽  
Trophic Specialisation

Increases in both food availability and intraspecific competition downstream of dams have the potential to trigger the emergence of trophic specialisation among fish predators, with considerable implications for prey species populations. The aim of this study was to assess whether the presence of a dam located on the River Garonne (France) affected the dietary preference of the European catfish Silurus glanis towards anadromous prey. Stable isotope analysis showed that the contribution of marine-derived carbon in the diet of the European catfish was substantial (on average 53% of the diet) and was similar between individuals caught downstream of the dam and those caught from the free running part of the river. In contrast with previous studies, a significant relationship between the size of European catfish individuals and their consumption of marine-derived nutrients was found in this study. Anadromous fish populations are in decline; therefore, this significant predation is concerning.

scholarly journals Mining Lepidoptera of woody plants in the Arboretum of Mendel University of Agriculture and Forestry in Brno – species composition, origin and their influence on the health condition of plants

2005 ◽  
Vol 53 (2) ◽  
pp. 133-142 ◽  
Author(s):  
Hana Šefrová
Keyword(s):  
Species Diversity ◽  
Woody Plants ◽  
Health Condition ◽  
Individual Species ◽  
Trophic Relations ◽  
City Environment ◽  
Plant Groups ◽  
Plant Families ◽  
The City ◽  
Trophic Specialisation

The species diversity and trophic relations of mining Lepidoptera were investigated in the Arboretum of Mendel University of Agriculture and Forestry in Brno during the years 2002–2004. On the whole 132 species belonging to 13 families were found, of which 123 autochthonous and 9 alochthonous. The richest families were Nepticulidae (54 species), Gracillariidae (47) and Coleophoridae (12). The highest diversity of mining species showed the plant families Rosaceae (37), Fagaceae (22) and Betulaceae (20), and the genera Quercus (19), Malus (13) and Prunus (11). The infestation of autochthonous and alochthonous plant species was compared, the trophic specialisation of individual species and possibilities of the shift between these plant groups were evaluated. Neither any negative influnce of mining species on the health condition of plants, nor the distinct influence of the city environment on the species diversity of mining moths were registered.

Global trends in the trophic specialisation of flower‐visitor networks are explained by current and historical climate

2021 ◽  
Author(s):  
Pedro Luna ◽  
Fabricio Villalobos ◽  
Federico Escobar ◽  
Frederico Neves ◽  
Wesley Dáttilo
Keyword(s):  
Global Trends ◽  
Flower Visitor ◽  
Historical Climate ◽  
Trophic Specialisation

scholarly journals Trophic specialisation of metazoan meiofauna at the Håkon Mosby Mud Volcano: fatty acid biomarker isotope evidence

2009 ◽  
Vol 156 (6) ◽  
pp. 1289-1296 ◽  
Author(s):  
Saskia Van Gaever ◽  
Leon Moodley ◽  
Francesca Pasotti ◽  
Marco Houtekamer ◽  
Jack J. Middelburg ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Mud Volcano ◽  
Metazoan Meiofauna ◽  
Isotope Evidence ◽  
Fatty Acid Biomarker ◽  
Trophic Specialisation

Individual trophic specialisation and niche segregation explain the contrasting population trends of two sympatric otariids

2014 ◽  
Vol 161 (3) ◽  
pp. 609-618 ◽  
Author(s):  
Valentina Franco-Trecu ◽  
David Aurioles-Gamboa ◽  
Pablo Inchausti
Keyword(s):  
Population Trends ◽  
Niche Segregation ◽  
Trophic Specialisation

scholarly journals Individual Trophic Specialisation in the Alpine Newt Increases with Increasing Resource Diversity

2019 ◽  
Vol 56 (1-6) ◽  
pp. 17 ◽  
Author(s):  
Sebastiano Salvidio ◽  
Andrea Costa ◽  
Federico Crovetto
Keyword(s):  
Alpine Newt ◽  
Resource Diversity ◽  
Trophic Specialisation

scholarly journals Population niche breadth and individual trophic specialisation of fish along a climate-productivity gradient

2021 ◽  
Author(s):  
Javier Sánchez-Hernández ◽  
Brian Hayden ◽  
Chris Harrod ◽  
Kimmo K. Kahilainen
Keyword(s):  
Climate Change ◽  
Environmental Change ◽  
Trophic Ecology ◽  
Niche Breadth ◽  
Prey Availability ◽  
Future Climate Change ◽  
Coregonus Lavaretus ◽  
Subarctic Lakes ◽  
Productivity Gradient ◽  
Trophic Specialisation

AbstractA mechanistic understanding of how environmental change affects trophic ecology of fish at the individual and population level remains elusive. To address this, we conducted a space-for-time approach incorporating environmental gradients (temperature, precipitation and nutrients), lake morphometry (visibility, depth and area), fish communities (richness, competition and predation), prey availability (richness and density) and feeding (population niche breadth and individual trophic specialisation) for 15 native fish taxa belonging to different thermal guilds from 35 subarctic lakes along a marked climate-productivity gradient corresponding to future climate change predictions. We revealed significant and contrasting responses from two generalist species that are abundant and widely distributed in the region. The cold-water adapted European whitefish (Coregonus lavaretus) reduced individual specialisation in warmer and more productive lakes. Conversely, the cool-water adapted Eurasian perch (Perca fluviatilis) showed increased levels of individual specialism along climate-productivity gradient. Although whitefish and perch differed in the way they consumed prey along the climate-productivity gradient, they both switched from consumption of zooplankton in cooler, less productive lakes, to macrozoobenthos in warmer, more productive lakes. Species with specialist benthic or pelagic feeding did not show significant changes in trophic ecology along the gradient. We conclude that generalist consumers, such as warmer adapted perch, have clear advantages over colder and clear-water specialised species or morphs through their capacity to undergo reciprocal benthic–pelagic switches in feeding associated with environmental change. The capacity to show trophic flexibility in warmer and more productive lakes is likely a key trait for species dominance in future communities of high latitudes under climate change.

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