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45 results for “trophic guilds”
Figure 2 in Dynamic of fish trophic guilds in the plateau-plain gradient in the Paraguay River, Northern Pantanal
Figure 2. Limnological characteristics in the sampled segments in the Paraguay River, Mato Grosso, Brazil, from July to November 2017 and August 2018. (A) temperature. (B) water transparency. * indicates statistical difference at the 0.05 significance level.
Figure 4 in Dynamic of fish trophic guilds in the plateau-plain gradient in the Paraguay River, Northern Pantanal
Figure 4. Principal Component Analysis (PCA) of the limnological and environmental variables in the segments in the Paraguay River, from July to November 2017 and August 2018. (A) variables contribution. (B) sampled areas ordination.
Data from: Trophic guilds differ in blood glucose concentrations: A phylogenetic comparative analysis in birds
<p>Glucose is a central metabolic compound used as a source of energy across all animal taxa. There is high interspecific variation in glucose concentration between taxa, the origin and the consequence of which remain largely unknown. Nutrition may affect glucose concentrations because carbohydrate content of different food sources may determine the importance of metabolic pathways in the organism. Birds sustain high glucose concentrations that may entail the risks of oxidative damage. We collected glucose concentration and life history data from 202 bird species from 171 scientific publications; classified them into seven trophic guilds and analysed the data with a phylogenetically controlled model. We show that glucose concentration is negatively associated with body weight and is significantly associated with trophic guilds with a moderate phylogenetic signal. After controlling for allometry, glucose concentrations were highest in carnivorous birds, which rely on high rates of gluconeogenesis to maintain their glycemia and lowest in frugivorous/nectarivorous species, which intake carbohydrates directly. However, trophic guilds with different glucose concentrations did not differ in lifespan. These results link nutritional ecology to physiology and suggest that at the macroevolutionary scale, species requiring constantly elevated glucose concentrations may have additional adaptations to avoid the risks associated with high glycemia.</p>
Data from: Challenging trophic position assessments in complex ecosystems: calculation method, choice of baseline, trophic enrichment factors, season and feeding guild do matter. A case study from Marquesas Islands coral reefs
<p>Assessments of ecosystem functioning are a fundamental ecological challenge and an essential foundation for ecosystem-based management. An understanding of species trophic positions (TP) is essential to characterize food web architecture. However, despite the intuitive nature of the concept, empirically estimating TP is a challenging task due to the complexity of trophic interaction networks. Various alternative methods are proposed to assess TPs, including different approaches to account for the different sources of organic matter at the base of the food web (the "baseline"). However, it is often not clear which methodological approach and which baseline choices are the most reliable. Using an ecosystem-wide assessment of a tropical reef (Marquesas Islands, French Polynesia, with available data for 70 coral reef invertebrate and fish species), we tested whether different commonly used TP estimation methods yield similar results and, if not, whether it is possible to identify the most reliable method. We found significant differences in TP estimates of up to 1.7 TP for the same species, depending on the method and the baseline used. When using bulk stable isotope data, the choice of the baseline significantly impacted TP values. Indeed, while δ<sup>15</sup>N values of macroalgae led to consistent TP estimates, those using phytoplankton generated unrealistically low TP estimates. The use of a conventional enrichment factor (i.e. 3.4 ‰) or a "variable" enrichment factor (i.e. according to feeding guilds) also produced clear discrepancies between TP estimates. Regarding the use of different calculation methods, TPs obtained with δ<sup>15</sup>N values of source amino acids (compound specifics isotope analysis) were close to those assessed with macroalgae, but evidenced the opposite seasonal pattern, with significantly lower TPs in winter than in summer for the majority of assessed species, with particularly pronounced differences for lower TP species. We use the observed differences to discuss possible drivers of the diverging TP estimates and the potential ecological implications.</p>
Trait Spreadsheet to DwCA: Trophic guild data for fungi
<p></p>https://eol-jira.bibalex.org/browse/DATA-1882<p></p>Created: 2023-02-22 11:18
Trait Spreadsheet to DwCA: Trophic guild data for microbial eukaryotes
<p></p>https://eol-jira.bibalex.org/browse/DATA-1882<p></p>Updated: 2022-05-31 02:59
Fish species classification, trophic guilds and geographical distribution of northeast China
<p>Muling River, surrounded by cultivated land of Heilongjiang Province in the northeast of China, experienced sand-digging activities for a long time, and its riverbed has been seriously damaged. However, the knowledge about the impact of this disturbance on the status of fish community structure and diversity was little studied in this river. In this study, environmental factors and fish assembles from Muling River were investigated in spring, summer and autumn of 2015 and 2017, respectively. During the investigation period, 46 species of five orders and 12 families of fish were classified into seven trophic guilds. Our results demonstrated that the fish species diversity indices and variation trends of the Shannon-Wiener diversity index, Pielou evenness index and Margalef richness index were consistent. RDA analysis showed that water depth was significantly correlated with zooplankton feeding habits, and transparency correlated with aquatic plant feeding. This study supports the need for trophic guilds taxonomic studies of freshwater fishes to underpin management in areas subject to significant environmental change.</p>
Empirical measurements of ammonium excretion in kelp forest fishes: Effects of body size, taxonomy and trophic guild
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Data from: Challenging trophic position assessments in complex ecosystems: calculation method, choice of baseline, trophic enrichment factors, season and feeding guild do matter. A case study from Marquesas Islands coral reefs
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Data from: Trophic guilds differ in blood glucose concentrations: A phylogenetic comparative analysis in birds
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Spatial-temporal gradient variation patterns of fish trophic guilds in a freshwater river wetland ecosystem of northeastern China
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Data from: Species richness of trophic guilds increases with discharge and decreases with variability in tropical river fish communities
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Supplementary material 1 from: Rodríguez J, Novoa A, Cordero-Rivera A, Richardson DM, González L (2020) Biogeographical comparison of terrestrial invertebrates and trophic feeding guilds in the native and invasive ranges of Carpobrotus edulis. NeoBiota 56: 49-72. https://doi.org/10.3897/neobiota.56.49087
Biogeographical comparison of terrestrial invertebrates and trophic feeding guilds in the native and invasive ranges of Carpobrotus edulis
Data from: Questioning assumptions of trophic behavior in a broadly ranging marine predator guild
We evaluated whether existing assumptions regarding the trophic ecology of a poorly-studied predator guild, northwest (NW) Atlantic skates (family: Rajidae), were supported across broad geographic scales. Four hypotheses were tested using carbon (δ13C) and nitrogen (δ15N) stable isotope values as metrics of foraging behavior: 1) species exhibit ontogenetic shifts in habitat and thus display a shift in 13C with differential use of the continental shelf; 2) species exhibit ontogenetic prey shifts (i.e., from smaller to larger prey items) and become enriched in 15N; 3) individuals acquire energy from spatially confined local resource pools and exhibit limited displacement; and 4) species exhibit similarly sized and highly overlapping trophic niches. We found someweak evidence for ontogenetic shifts in habitat-use (δ13C) for thorny and little skate and diet (δ15N) for thorny and winter skate and hypothesize that individuals exhibit gradual trophic niche transition, especially in δ15N space, rather than a clear and distinct shift in diet throughout ontogeny. Spatial isoscapes generated for little, thorny, and winter skate, highlighted distinct spatial patterns in isotopic composition across the coastal shelf. For little and thorny skate, patterns mimicked the expected spatial variability in isotopic composition of phytoplankton/POM, suggesting limited displacement and utilization of spatially confined resource pools. Winter skate, however, exhibited a much narrower range of δ13C and δ15N, suggesting individuals may pool resources from a more confined latitudinal range. Although high total trophic niche overlap was observed between some species (e.g., little and thorny skate), sympatric species (e.g., little and winter skate) exhibited potential trophic niche separation. These findings offer new insight into the trophic dynamics of a poorly studied, vulnerable group of predators, and highlight a need to re-examine assumptions pertaining to aspects of their ecology.
Data from: Multi-trophic guilds respond differently to changing elevation in a subtropical forest
Negative relationships between species richness and elevation are common and attributed to changes in single environmental properties associated to elevation, such as temperature and habitat area. However, research has lacked taxonomic breadth and comprehensive elevation studies that consider multiple groups from different trophic levels are rare. We thus analysed 24 groups of plants, arthropods, and microorganisms grouped into six trophic guilds (predators, detritivores, herbivores, plants, bacteria and fungi) along a relatively short elevational gradient (~600 m) in a subtropical forest in south-east China. The total species richness of all organisms was not related to elevation, nor was the richness of plants, herbivores or microorganisms. However, species richness and abundance in two major trophic guilds of arthropods changed with elevation, which was mediated by changes in elevation-associated habitat properties. Specifically, deadwood mass increased with elevation, which increased detritivore richness indirectly via detritivore abundance, thus supporting the 'more individuals hypothesis'. In contrast, lower predator richness at higher elevations was directly related to lower mean temperatures, which had no effect on abundance. Our study demonstrates that even along relatively short gradients, elevation can have strong direct and abundance-mediated effects on species richness, but with effects varying from positive to negative signs depending on local resource availability and the characteristics of groups or trophic guilds. If elevation positively influences local environmental properties that benefit a given group, richness can increase towards higher elevations. Thus, the effect of global change in mountainous regions should be evaluated within the local environmental context using multi-taxon approaches.
Kinematic and morphological data from: Trophic guilds of suction-feeding fish are distinguished by their characteristic hydrodynamics of swimming and feeding
<p>Suction-feeding in fish is a ubiquitous form of prey capture whose outcome depends both on the movements of the predator and the prey, and on the dynamics of the surrounding fluid, which exerts forces on the two organisms. The inherent complexity of suction-feeding has challenged previous efforts to understand how the feeding strikes are modified when species evolve to feed on different prey types. Here, we utilize the concept of dynamic similarity, commonly applied to understanding the mechanisms of swimming, flying, walking, and aquatic feeding. We characterize the hydrodynamic regimes pertaining to 1) the forward movement of the fish (ram), and 2) the suction flows for feeding strikes of 71 species of acanthomorph fish. A discriminant function analysis revealed that feeding strikes of zooplanktivores, generalists, and piscivores could be distinguished based on their hydrodynamic regimes. Furthermore, a phylogenetic comparative analysis revealed that there are distinctive hydrodynamic adaptive peaks associated with zooplanktivores, generalists, and piscivores. The scaling of dynamic similarity across species, body sizes, and feeding guilds in fish indicates that elementary hydrodynamic principles govern the trophic evolution of suction-feeding in fish.</p>
Figure 1 in Dynamic of fish trophic guilds in the plateau-plain gradient in the Paraguay River, Northern Pantanal
Figure 1. The sampling sites along the Paraguay River, state of Mato Grosso, Brazil.
Figure 2 in Urbanization impacts on the trophic guild composition of bird communities
Figure 2. Exploratory boxplot showing the richness of trophic guilds (number of trophic guilds per transect) at each urban stratum of the urban gradient. References: urban (CENTER), suburban (SUB), periurban (PERI), forested (PARK) and natural (NAT) sectors.
Figure 5 in Urbanization impacts on the trophic guild composition of bird communities
Figure 5. Biplot of redundancy analysis (RDA) showing the association between trophic guild abundance and significant habitat structure variables along the urban gradient. Arrow length indicates the importance of the variable in the model and arrow orientation, the direction of the variable increase. References: percentage of area covered by herbaceous vegetation (GRASS); pavement (PAVEM); high buildings (BHIGH) and water bodies (WATERB). Guilds: aquatic diving carnivore (AquaDivCar); aquatic diving omnivore (AquaDivOmn); aquatic filter (AquaFil); aquatic striding carnivore (AquaStrCar); aquatic striding omnivore (AquaStrOmn); bark insectivore (BarkIns); coursing aerial insectivore (CourAerIns); foliage granivore (FoliGra); foliage insectivore (FoliIns); foliage omnivore (FoliOmn); generalized granivore (GeneGra); generalized insectivore (GeneIns); generalized omnivore (GeneOmn); hawking aerial carnivore (HawkAerCar); hawking aerial insectivore (HawkAerIns); nectarivore (Nect); terrestrial granivore (TerrGra); terrestrial insectivore (TerrIns); and terrestrial omnivore (TerrOmn).
Figure 1 in Urbanization impacts on the trophic guild composition of bird communities
Figure 1. Santa Fe city and strata of the urban gradient indicated by circles. The urban matrix is represented by white and water bodies and forested areas with shades of grey. References: urban (CEN), suburban (SUB), periurban (PERI), forested (PARK) and natural (NAT) sectors.
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