Altered body size distributions in a large river fish community enriched by sewage

2002 ◽  
Vol 59 (5) ◽  
pp. 819-828 ◽  
Author(s):  
Adrian M.H deBruyn ◽  
David J Marcogliese ◽  
Joseph B Rasmussen
Keyword(s):  
Body Size ◽  
Upper Bound ◽  
Fish Community ◽  
Local Variation ◽  
Large River ◽  
Habitat Characteristics ◽  
Size Distributions ◽  
Treated Sewage ◽  
Energetic Constraints ◽  
River Fish

We used two approaches (interspecific upper bound and normalized biomass spectrum, NBS) to study size distributions in a littoral fish community across a natural gradient of epiphytic primary production and at sites enriched by primary-treated sewage. The upper bound of the interspecific density – body size relationship supported universal energetic constraints on the regional assemblage but revealed substantial variation in size distributions at a local scale. Multivariate analysis of the modes composing the NBS suggested possible mechanisms for this local variation in size distributions. Only the largest organisms had higher densities at higher levels of productivity. Densities of smaller organisms could be explained by a combination of habitat characteristics and feeding interactions.

scholarly journals Shift in a Large River Fish Assemblage: Body-Size and Trophic Structure Dynamics

PLoS ONE ◽  
2015 ◽  
Vol 10 (4) ◽  
pp. e0124954 ◽  
Author(s):  
Kyle J. Broadway ◽  
Mark Pyron ◽  
James R. Gammon ◽  
Brent A. Murry
Keyword(s):  
Body Size ◽  
Fish Assemblage ◽  
Trophic Structure ◽  
Large River ◽  
Structure Dynamics ◽  
River Fish

scholarly journals Normalized abundance spectra of fish community reflect hydro-peaking on a Mediterranean large river

2019 ◽  
Vol 97 ◽  
pp. 280-289
Author(s):  
Núria Vila-Martínez ◽  
Nuno Caiola ◽  
Carles Ibáñez ◽  
Lluis Benejam ◽  
Sandra Brucet
Keyword(s):  
Fish Community ◽  
Large River

Assessing power of large river fish monitoring programs to detect population changes: the Missouri river sturgeon example

2011 ◽  
Vol 27 (2) ◽  
pp. 282-290 ◽  
Author(s):  
M. L. Wildhaber ◽  
S. H. Holan ◽  
J. L. Bryan ◽  
D. W. Gladish ◽  
M. Ellersieck
Keyword(s):  
Missouri River ◽  
Large River ◽  
Population Changes ◽  
Monitoring Programs ◽  
Fish Monitoring ◽  
River Fish

scholarly journals Sex, Age, and Body Size Distributions of Western Sandpipers During the Nonbreeding Season With Respect to Local Habitat

The Condor ◽  
2006 ◽  
Vol 108 (3) ◽  
pp. 547-557 ◽  
Author(s):  
Guillermo Fernández ◽  
David B. Lank
Keyword(s):  
Population Structure ◽  
Body Size ◽  
Local Density ◽  
Late Winter ◽  
Size Distributions ◽  
Nonbreeding Season ◽  
Age Class ◽  
Migratory Shorebirds ◽  
Western Sandpipers ◽  
Northwestern Mexico

AbstractWe documented the local density and sex, age-class, and body size distributions of Western Sandpipers (Calidris mauri) among habitats at Bahía Santa María, northwestern Mexico, during the nonbreeding season. Three habitats were recognized: brackish flats, mangroves, and cattail marshes, which we ranked as richest to poorest in food resources and safest to most dangerous in predation danger. Western Sandpiper population structure differed among habitats. Bird densities were highest in brackish flats, the richest and safest habitat, and males and adults of both sexes were overrepresented. In cattail marshes, which appeared to be the poorest and most dangerous habitat, bird densities were lower, and the sex ratio and age ratios within each sex were more even. In mangroves, bird densities were similar to those in cattail marshes, but sex and age ratios were similar to those in brackish flats. Exposed culmen, an index of structural size, was not related to habitat use in either sex. Body mass of immature males was more variable than that of adults among habitats and immature males gained mass throughout the winter. Birds in brackish flats and mangroves were initially heavier, but tended to lose mass, whereas birds in cattail marshes were initially lighter, but tended to gain mass. Mass distributions thus converged in late winter. While the social and ecological causes and significance of differential sex and age-class distributions among habitats remain largely unquantified, evidence from this and previous studies suggests that nonbreeding population structure is a common phenomenon with important implications for migratory shorebirds.

Factors controlling lambing period of Dall's sheep

1980 ◽  
Vol 58 (6) ◽  
pp. 1027-1031 ◽  
Author(s):  
Fred L. Bunnell
Keyword(s):  
Body Size ◽  
Ovis Dalli ◽  
Study Population ◽  
Energetic Constraints ◽  
Dall’S Sheep

Distribution of birth dates within the study population of Ovis dalli dalli reveal two distinct oestrous cycles with a further 15% of all births resulting from a third cycle. The onset of breeding appears governed by photoperiod. Lambs born early and late in the lambing period suffer higher mortality. Energetic constraints limit both onset and duration of lambing. Onset is delayed beyond the period critical to thermoregulation by lambs and until forage is adequate; duration is limited by the need of lambs to attain adequate body size by winter.

scholarly journals Resonance-induced multimodal body-size distributions in ecosystems

2012 ◽  
Vol 110 (1) ◽  
pp. 205-209 ◽  
Author(s):  
A. Lampert ◽  
T. Tlusty
Keyword(s):  
Body Size ◽  
Size Distributions

scholarly journals Cladoceran body size distributions along temperature and trophic gradients in the conterminous USA

2020 ◽  
Author(s):  
John R Beaver ◽  
Claudia E Tausz ◽  
Katherine M Black ◽  
Benjamin A Bolam
Keyword(s):  
Climate Change ◽  
Body Size ◽  
Multiple Regression ◽  
Water Clarity ◽  
Total Biomass ◽  
Ecosystem Structure ◽  
Strong Positive Correlation ◽  
Size Distributions ◽  
Strong Negative Correlation ◽  
Lake Ecosystems

Abstract Body size is an important functional trait that can be indicative of ecosystem structure and constraints on growth. Both increasing temperatures and eutrophication of lakes have been associated with a shift toward smaller zooplankton taxa. This is important in the context of climate change, as most aquatic habitats are expected to warm over the coming decades. Our study uses data from over 1000 lakes surveyed across a range of latitudes (26–49°N) and surface temperatures (10–35°C) in the USA during the spring/summer of 2012 to characterize pelagic cladoceran body size distributions. We used univariate and multiple regression modeling to determine which environmental parameters were strongly correlated to cladoceran body size. A strong positive correlation was observed between cladoceran body size and latitude, while a strong negative correlation was observed between cladoceran body size and water temperature. The ratio of zooplankton to phytoplankton, as well as relative total biomass contributions by cladocerans, decreased as trophic state increased. Multiple regression identified temperature-related variables and water clarity as significantly affecting cladoceran body size. These observations demonstrate the dual threat of climate change and eutrophication on lake ecosystems and highlight potential changes in biogeographical patterns of zooplankton as lakes warm.

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