Dietary Variation in a Freshwater Fish Species: Relative Contributions of Biotic Interactions, Abiotic Factors, and Spatial Structure

1994 ◽  
Vol 51 (12) ◽  
pp. 2856-2865 ◽  
Author(s):  
Pierre Magnan ◽  
Marco A. Rodríguez ◽  
Pierre Legendre ◽  
Sylvain Lacasse
Keyword(s):  
Spatial Structure ◽  
Freshwater Fish ◽  
Fish Species ◽  
Environmental Variables ◽  
Brook Trout ◽  
Diet Composition ◽  
Abiotic Factors ◽  
Biotic Interactions ◽  
Relative Contribution ◽  
Dietary Variation

We used multivariate analyses to examine which variables among the environmental and spatial components can best account for dietary variation in a freshwater fish, brook trout, Salvelinus fontinalis. The diet composition of brook trout was quantified in 37 lakes of the Laurentian Shield, Québec, Canada. Among the 25 measured environmental variables, fish species composition, sampling date, macrophyte abundance, and trout body length were the best predictors of diet composition. The total variation in diet composition was partitioned into four components: pure environmental 21.6%, pure spatial 23.2%, shared 19.9%, and unexplained 35.3%. A significant spatial trend in diet composition existed even after accounting for the main effects measured by the environmental variables. The two sets of spatial variables, when combined with the environmental descriptors, extracted different components of the dietary variation. The study allowed us to (1) highlight the role of spatial structure in diet variation of brook trout, (2) determine the relative contribution of both environmental and spatial components, and (3) generate testable hypotheses concerning mechanisms underlying the observed structure. Dependent variables other than diet composition, such as the density of different species at different sampling sites, can be used within the same statistical framework in studies of community ecology.

Spatial structuring of submerged aquatic vegetation in an estuarine habitat of the Gulf of Mexico

2012 ◽  
Vol 93 (4) ◽  
pp. 855-866 ◽  
Author(s):  
Aretha Moriana Burgos-León ◽  
David Valdés ◽  
Ma. Eugenia Vega ◽  
Omar Defeo
Keyword(s):  
Spatial Structure ◽  
Environmental Variables ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Spatial Scales ◽  
Ruppia Maritima ◽  
Spatial Partitioning ◽  
Estuarine Habitat ◽  
Relative Contribution ◽  
Geostatistical Techniques

Seasonal changes in spatial structure of biomass of submerged aquatic vegetation (SAV) and environmental variables were evaluated in Celestun Lagoon, an estuarine habitat in Mexico. Geostatistical techniques were used to evaluate spatial autocorrelation and to predict the spatial distribution by kriging. The relative contribution of 11 environmental variables in explaining the spatial structure of biomass of SAV was evaluated by canonical correspondence analysis. Spatial partitioning between species of SAV was evident: the seagrasses Halodule wrightii and Ruppia maritima dominated the seaward and central zones of the lagoon, respectively, whereas the green alga Chara fibrosa was constrained to the inner zone. The spatial structure and seasonal variability of SAV biomass were best explained by organic carbon in the sediments, salinity and total suspended solids in the water column. Analysis at different spatial scales allowed identifying the importance of spatial structure in biotic and abiotic variables of this estuarine habitat.

Cadmium and copper contents in a freshwater fish species (brook trout, Salvelinus fontinalis) from the subantarctic Kerguelen Islands

Polar Biology ◽  
2010 ◽  
Vol 34 (3) ◽  
pp. 397-409 ◽  
Author(s):  
A. Jaffal ◽  
S. Paris-Palacios ◽  
S. Jolly ◽  
A. F. Thailly ◽  
L. Delahaut ◽  
...  
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Kerguelen Islands ◽  
Freshwater Fish Species

scholarly journals Predictors of contraction and expansion of area of occupancy for British birds

2014 ◽  
Vol 281 (1786) ◽  
pp. 20140744 ◽  
Author(s):  
Corey J. A. Bradshaw ◽  
Barry W. Brook ◽  
Steven Delean ◽  
Damien A. Fordham ◽  
Salvador Herrando-Pérez ◽  
...  
Keyword(s):  
Life History ◽  
Abiotic Factors ◽  
Biotic Interactions ◽  
Bird Community ◽  
Lower Probability ◽  
Dispersal Capacity ◽  
Climate Conditions ◽  
Relative Contribution ◽  
Area Of Occupancy ◽  
Geographical Context

Geographical range dynamics are driven by the joint effects of abiotic factors, human ecosystem modifications, biotic interactions and the intrinsic organismal responses to these. However, the relative contribution of each component remains largely unknown. Here, we compare the contribution of life-history attributes, broad-scale gradients in climate and geographical context of species’ historical ranges, as predictors of recent changes in area of occupancy for 116 terrestrial British breeding birds (74 contractors, 42 expanders) between the early 1970s and late 1990s. Regional threat classifications demonstrated that the species of highest conservation concern showed both the largest contractions and the smallest expansions. Species responded differently to climate depending on geographical distribution—northern species changed their area of occupancy (expansion or contraction) more in warmer and drier regions, whereas southern species changed more in colder and wetter environments. Species with slow life history (larger body size) tended to have a lower probability of changing their area of occupancy than species with faster life history, whereas species with greater natal dispersal capacity resisted contraction and, counterintuitively, expansion. Higher geographical fragmentation of species' range also increased expansion probability, possibly indicating a release from a previously limiting condition, for example through agricultural abandonment since the 1970s. After accounting statistically for the complexity and nonlinearity of the data, our results demonstrate two key aspects of changing area of occupancy for British birds: (i) climate is the dominant driver of change, but direction of effect depends on geographical context, and (ii) all of our predictors generally had a similar effect regardless of the direction of the change (contraction versus expansion). Although we caution applying results from Britain's highly modified and well-studied bird community to other biogeographic regions, our results do indicate that a species' propensity to change area of occupancy over decadal scales can be explained partially by a combination of simple allometric predictors of life-history pace, average climate conditions and geographical context.

Fish Species Composition and Lake Abiotic Variables in Relation to the Abundance and Size Structure of Cladoceran Zooplankton

1993 ◽  
Vol 50 (3) ◽  
pp. 638-647 ◽  
Author(s):  
Marco A. Rodríguez ◽  
Pierre Magnan ◽  
Sylvain Lacasse
Keyword(s):  
Species Composition ◽  
Fish Species ◽  
Brook Trout ◽  
Redundancy Analysis ◽  
Abiotic Factors ◽  
Analysis Of Covariance ◽  
Numerical Density ◽  
White Sucker ◽  
Abiotic Variables ◽  
Fish Species Composition

Redundancy analysis and a multiple regression approach to analysis of variance and analysis of covariance were used to evaluate the influence of fish species composition and abiotic variables on the numerical density, biomass, and mean length of individual cladoceran taxa from 43 Laurentian Shield lakes. Cladoceran assemblage structure was still associated with fish species composition when potentially confounding effects of abiotic variables were accounted for by partial redundancy analysis. Cladoceran abundances were strongly related to the occurrence of white sucker (Catostomus commersoni) and lake maximum depth; mean lengths were influenced most by white sucker, water transparency, lake volume, and sampling date. The abundance of bosminids and length of Holopedium were strongly related to the occurrence of white sucker even when the influence of abiotic factors was removed by regression. In lakes with white sucker and brook trout (Salvelinus fontinalis), Holopedium mean length decreased and bosminid abundance increased fourfold relative to lakes with brook trout only; large (>1.2 mm) Holopedium abundance was reduced by 76–81%, suggesting that size-selective predation occurred. The increase in bosminid abundance in the presence of white sucker may have been a response to diminished competition by large Holopedium, but density compensation was not observed.

scholarly journals Forecasting the future establishment of invasive alien freshwater fish species

2021 ◽  
Author(s):  
Sam Wenaas Perrin ◽  
Kim Magnus Bærum ◽  
Ingeborg Palm Helland ◽  
Anders Gravbrøt Finstad
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Freshwater Fish Species ◽  
The Future

Effects of turbidity on prey consumption and growth in brook trout and implications for bioenergetics modeling

2001 ◽  
Vol 58 (2) ◽  
pp. 386-393 ◽  
Author(s):  
John A Sweka ◽  
Kyle J Hartman
Keyword(s):  
Growth Rates ◽  
Brook Trout ◽  
Specific Growth ◽  
Abiotic Factors ◽  
Foraging Strategies ◽  
Turbid Water ◽  
Daily Consumption ◽  
Consumption Rates ◽  
The Difference ◽  
Specific Growth Rates

Brook trout (Salvelinus fontinalis) were held in an artificial stream to observe the influence of turbidity on mean daily consumption and specific growth rates. Treatment turbidity levels ranged from clear (<3.0 nephelometric turbidity units (NTU)) to very turbid water (> 40 NTU). Observed mean daily specific consumption rates were standardized to the mean weight of all brook trout tested. Turbidity had no significant effect on mean daily consumption, but specific growth rates decreased significantly as turbidity increased. Brook trout in turbid water became more active and switched foraging strategies from drift feeding to active searching. This switch was energetically costly and resulted in lower specific growth rates in turbid water as compared with clear water. Bioenergetics simulations were run to compare observed growth with that predicted by the model. Observed growth values fell below those predicted by the model and the difference increased as turbidity increased. Abiotic factors, such as turbidity, which bring about changes in the activity rates of fish, can have implications for the accuracy of predicted growth by bioenergetics models.

Major threats to European freshwater fish species

2021 ◽  
pp. 149105
Author(s):  
Maria João Costa ◽  
Gonçalo Duarte ◽  
Pedro Segurado ◽  
Paulo Branco
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Freshwater Fish Species
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