Fattv acid content of some freshwater fish in lakes of different trophic levels - a bottom-up effect?

1996 ◽  
Vol 5 (1) ◽  
pp. 15-27 ◽  
Author(s):  
G. Ahigren ◽  
L. Sonesten ◽  
M. Boberg ◽  
L. B. Gustafsson
Keyword(s):  
Freshwater Fish ◽  
Acid Content ◽  
Trophic Levels ◽  
Bottom Up

Negative bottom-up effects of sulfadiazine, but not penicillin and tetracycline, in soil substitute on plants and higher trophic levels

2019 ◽  
Vol 245 ◽  
pp. 531-544 ◽  
Author(s):  
Gesine Pufal ◽  
Jörg Memmert ◽  
Sara Diana Leonhardt ◽  
Vanessa Minden
Keyword(s):  
Trophic Levels ◽  
Bottom Up

Organ distribution and bioaccumulation of microcystins in freshwater fish at different trophic levels from the eutrophic Lake Chaohu, China

2005 ◽  
Vol 20 (3) ◽  
pp. 293-300 ◽  
Author(s):  
Liqiang Xie ◽  
Ping Xie ◽  
Longgen Guo ◽  
Li Li ◽  
Yuichi Miyabara ◽  
...  
Keyword(s):  
Freshwater Fish ◽  
Eutrophic Lake ◽  
Trophic Levels ◽  
Organ Distribution ◽  
Lake Chaohu

scholarly journals Interpreting variation in fish-based food web indicators: the importance of “bottom-up limitation” and “top-down control” processes

2013 ◽  
Vol 71 (2) ◽  
pp. 406-416 ◽  
Author(s):  
T. O. M. Reilly ◽  
H. M. Fraser ◽  
R. J. Fryer ◽  
J. Clarke ◽  
S. P. R. Greenstreet
Keyword(s):  
Food Web ◽  
Food Webs ◽  
Trophic Levels ◽  
Top Down ◽  
Bottom Up ◽  
Control Processes ◽  
Top Predators ◽  
Environmental Status ◽  
Fish Predators ◽  
Firth Of Forth

Abstract Reilly, T. O. M., Fraser, H. M., Fryer, R. J., Clarke, J., and Greenstreet, S. P. R. 2014. Interpreting variation in fish-based food web indicators: the importance of “bottom-up limitation” and “top-down control” processes. – ICES Journal of Marine Science, 71: 406–416. Proposed indicators for the Marine Strategy Framework Directive (MSFD) food webs Descriptor focus on structural elements of food webs, and in particular on the abundance and productivity of top predators. However, the inferences that can be drawn from such indicators depend on whether or not the predators are “bottom-up limited” by the availability of their prey. Many seabird populations appear to be “bottom-up limited” so that variation in their reproductive success and/or abundance reflects changes in lower trophic levels. Here we find that gadoid fish predators off the Firth of Forth, southeast Scotland, do not appear to be “bottom-up limited” by the biomass of their main prey, 0-group sandeels; gadoid biomass and feeding performance was independent of sandeel biomass. Variability in food web indicators based on these gadoid predators seems to impart little insight into underlying processes occurring at lower trophic levels in the local food web. The implications of this in terms of how the currently proposed MSFD food web indicators should be used and interpreted are considered, and the ramifications in terms of setting targets representing good environmental status for both fish and seabird communities are discussed.

scholarly journals Adaptive genetic variation mediates bottom-up and top-down control in an aquatic ecosystem

2015 ◽  
Vol 282 (1812) ◽  
pp. 20151234 ◽  
Author(s):  
Seth M. Rudman ◽  
Mariano A. Rodriguez-Cabal ◽  
Adrian Stier ◽  
Takuya Sato ◽  
Julian Heavyside ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Intraspecific Variation ◽  
Phenotypic Variation ◽  
Evolutionary Dynamics ◽  
Trophic Levels ◽  
Community Genetics ◽  
Top Down ◽  
Black Cottonwood ◽  
Bottom Up

Research in eco-evolutionary dynamics and community genetics has demonstrated that variation within a species can have strong impacts on associated communities and ecosystem processes. Yet, these studies have centred around individual focal species and at single trophic levels, ignoring the role of phenotypic variation in multiple taxa within an ecosystem. Given the ubiquitous nature of local adaptation, and thus intraspecific variation, we sought to understand how combinations of intraspecific variation in multiple species within an ecosystem impacts its ecology. Using two species that co-occur and demonstrate adaptation to their natal environments, black cottonwood ( Populus trichocarpa ) and three-spined stickleback ( Gasterosteus aculeatus ), we investigated the effects of intraspecific phenotypic variation on both top-down and bottom-up forces using a large-scale aquatic mesocosm experiment. Black cottonwood genotypes exhibit genetic variation in their productivity and consequently their leaf litter subsidies to the aquatic system, which mediates the strength of top-down effects from stickleback on prey abundances. Abundances of four common invertebrate prey species and available phosphorous, the most critically limiting nutrient in freshwater systems, are dictated by the interaction between genetic variation in cottonwood productivity and stickleback morphology. These interactive effects fit with ecological theory on the relationship between productivity and top-down control and are comparable in strength to the effects of predator addition. Our results illustrate that intraspecific variation, which can evolve rapidly, is an under-appreciated driver of community structure and ecosystem function, demonstrating that a multi-trophic perspective is essential to understanding the role of evolution in structuring ecological patterns.

Transient top‐down and bottom‐up effects of resources pulsed to multiple trophic levels

Ecology ◽  
2020 ◽  
Author(s):  
Matthew A. McCary ◽  
Joseph S. Phillips ◽  
Tanjona Ramiadantsoa ◽  
Lucas A. Nell ◽  
Amanda R. McCormick ◽  
...  
Keyword(s):  
Trophic Levels ◽  
Top Down ◽  
Bottom Up

Nucleic Acid Content Changes of a Tropical Freshwater Fish Labeo rohita Fed Gelatinized and Nongelatinized Starch Diet

2010 ◽  
Vol 41 ◽  
pp. 270-277 ◽  
Author(s):  
Vikas Kumar ◽  
Narottam P. Sahu ◽  
Asim K. Pal ◽  
Shivendra Kumar ◽  
Vidya Sagar ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Freshwater Fish ◽  
Acid Content ◽  
Labeo Rohita ◽  
Nucleic Acid Content ◽  
Tropical Freshwater ◽  
Starch Diet

scholarly journals Distribution patterns of Procamallanus (Spirocamallanus) inopinatus (Nematoda: Camallanidae) and its interactions with freshwater fish in Brazil

2020 ◽  
Vol 29 (4) ◽  
Author(s):  
Lígia Rigôr Neves ◽  
Luís Mauricio Abdon Silva ◽  
Alexandro Cezar Florentino ◽  
Marcos Tavares-Dias
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
North Atlantic ◽  
Life Histories ◽  
Parasitic Infection ◽  
Distribution Patterns ◽  
Trophic Levels ◽  
Intermediate Hosts ◽  
Host Fish ◽  
Infection Parameters

Abstract This study used information about Procamallanus (Spirocamallanus) inopinatus Travassos, Artigas & Pereira, 1928 that had been published over a period of more than 90 years to investigate the infection and distribution patterns of this nematode in teleost freshwater fish in Brazil. This study was carried out using 181 samples from 82 fish species in 19 families within the five orders, with predominance of Characiformes species (71.6%). We organized a matrix-based parasite-host system in which the fish species were classified in different trophic levels and parasitic infection parameters according data available on host fish species with different life histories and geographic distributions across Brazilian hydrographic basins. Procamallanus (S.) inopinatus showed prevalence ranging from low to moderate, low abundance, low intensity, typically aggregated dispersion, and preferential infection of the hosts' gastrointestinal tract. There was difference in prevalence between detritivorous, omnivorous, carnivorous and piscivorous hosts, but no difference in intensity and abundance was found due to similarity in the communities of this endoparasite among the host fish species. The geographic distribution of this parasite encompasses the river of the Amazon, Paraná, São Francisco, North Atlantic, South Atlantic and Eastern basins. Lastly, suggestions regarding the life cycle of P. (S.) inopinatus, with its potential intermediate hosts, were discussed.

scholarly journals Common carp disrupt ecosystem structure and function through middle-out effects

2017 ◽  
Vol 68 (4) ◽  
pp. 718 ◽  
Author(s):  
Mark A. Kaemingk ◽  
Jeffrey C. Jolley ◽  
Craig P. Paukert ◽  
David W. Willis ◽  
Kjetil Henderson ◽  
...  
Keyword(s):  
Common Carp ◽  
Trophic Ecology ◽  
Experimental Studies ◽  
Structure And Function ◽  
Trophic Levels ◽  
Ecosystem Structure ◽  
Top Down ◽  
Bottom Up ◽  
And Function ◽  
Ecosystem Structure And Function

Middle-out effects or a combination of top-down and bottom-up processes create many theoretical and empirical challenges in the realm of trophic ecology. We propose using specific autecology or species trait (i.e. behavioural) information to help explain and understand trophic dynamics that may involve complicated and non-unidirectional trophic interactions. The common carp (Cyprinus carpio) served as our model species for whole-lake observational and experimental studies; four trophic levels were measured to assess common carp-mediated middle-out effects across multiple lakes. We hypothesised that common carp could influence aquatic ecosystems through multiple pathways (i.e. abiotic and biotic foraging, early life feeding, nutrient). Both studies revealed most trophic levels were affected by common carp, highlighting strong middle-out effects likely caused by common carp foraging activities and abiotic influence (i.e. sediment resuspension). The loss of water transparency, submersed vegetation and a shift in zooplankton dynamics were the strongest effects. Trophic levels furthest from direct pathway effects were also affected (fish life history traits). The present study demonstrates that common carp can exert substantial effects on ecosystem structure and function. Species capable of middle-out effects can greatly modify communities through a variety of available pathways and are not confined to traditional top-down or bottom-up processes.

Sign in / Sign up

Export Citation Format

Share Document