scholarly journals Hump‐shaped relationship between aggregation tendency and body size within fish populations

Ecography ◽  
2021 ◽  
Vol 44 (9) ◽  
pp. 1418-1427
Author(s):  
Ruo‐Yu Pan ◽  
Ting‐Chun Kuo ◽  
Chih‐hao Hsieh
Keyword(s):  
Body Size ◽  
Fish Populations ◽  
Aggregation Tendency

Ecophysiological determinants of the variation in 137Cs concentrations between and within lacustrine fish populations

2005 ◽  
Vol 62 (12) ◽  
pp. 2727-2739 ◽  
Author(s):  
Marcus Sundbom ◽  
Markus Meili
Keyword(s):  
Body Size ◽  
Trophic Position ◽  
Fish Populations ◽  
Chernobyl Fallout ◽  
Population Means ◽  
Activity Concentrations ◽  
Resource Specialization ◽  
Total Variability ◽  
Biomagnification Factors ◽  
Fish Trophic Position

One decade after the Chernobyl fallout, the variability of 137Cs activity concentrations among fish within a Swedish lake was >20-fold based on 1361 individuals from seven species collected continually during 1996–1999. Of the total variability, 64% was due to differences between species but only 7% due to temporal variation, which was 1.3-fold for the whole community and 1.3- to 2-fold for population means. Contamination increased with body size (0.6- to 6-fold) and decreased with body condition in most species (1.3-fold). Body size and time together accounted for about half of the total variation within populations. Fish 137Cs was related to differences in feeding ecology, both between and within populations. Biomagnification factors ranged from 2.4 to 5.8. Contamination was highest in piscivorous populations and individuals, intermediate in herbivores and zooplanktivores, and lowest in fish specialized in benthic invertebrates despite their association with contaminated sediments. The 137Cs variance within populations was not correlated with their niche width but moderately positively correlated with fish trophic position and strongly positively correlated with functional omnivory (diversity in prey 137Cs). We conclude that individual resource specialization is an important source of variation in 137Cs concentrations within fish populations.

Rapid growth and large body size in annual fish populations are compromised by density‐dependent regulation

2019 ◽  
Vol 95 (2) ◽  
pp. 673-678 ◽  
Author(s):  
Milan Vrtílek ◽  
Jakub Žák ◽  
Matej Polačik ◽  
Radim Blažek ◽  
Martin Reichard
Keyword(s):  
Body Size ◽  
Rapid Growth ◽  
Large Body ◽  
Fish Populations ◽  
Large Body Size ◽  
Annual Fish ◽  
Density Dependent ◽  
Density Dependent Regulation

scholarly journals Experimental harvesting of fish populations drives genetically based shifts in body size and maturation

2013 ◽  
Vol 11 (4) ◽  
pp. 181-187 ◽  
Author(s):  
Serinde J van Wijk ◽  
Martin I Taylor ◽  
Simon Creer ◽  
Christine Dreyer ◽  
Fernanda M Rodrigues ◽  
...  
Keyword(s):  
Body Size ◽  
Fish Populations

scholarly journals Influence of trophic status and conductivity on zooplankton composition in lakes and ponds of Torres del Paine National Park (Chile)

Biologia ◽  
2006 ◽  
Vol 61 (5) ◽  
Author(s):  
Doris Soto ◽  
Patricio Rios
Keyword(s):  
Body Size ◽  
National Park ◽  
Trophic Status ◽  
Small Body ◽  
Large Body ◽  
Fish Populations ◽  
Zooplankton Species ◽  
Calanoid Copepods ◽  
Chilean Patagonia ◽  
Torres Del Paine

AbstractThe Torres del Paine National Park is located in the southern Chilean Patagonia. This park has numerous and heterogeneous lakes and ponds with different trophic status and zooplankton composition. The aim of this study was to analyze the influence of trophic status and conductivity on zooplankton assemblages in lakes and ponds within the Torres del Paine National Park. The water bodies described in the present study were previously classified in three groups. The first group consisted of large, deep and oligotrophic lakes with fish populations, low zooplankton species diversity and high predominance of calanoid copepods of small body size. The second group contained small mesotrophic lakes with fish populations and relatively high predominance of small sized daphnids. The third group consisted of fishless ponds of different trophic status, wide conductivity gradient and with zooplankton species of relatively large body size. The results show that Daphnids abundance was directly related to chlorophyll-a concentration and inversely associated with conductivity. Calanoids abundance was also directly associated with conductivity.

Adolescent Gender Differences in Weight, Activity, and Body-Size Perception

2012 ◽  
Author(s):  
Judith R. Mccalla ◽  
Katie E. Chipungu ◽  
Patrice G. Saab ◽  
Amanda J. Countryman ◽  
Erin N. Etzel ◽  
...  
Keyword(s):  
Gender Differences ◽  
Body Size ◽  
Size Perception ◽  
Body Size Perception
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