Mechanisms of Density-dependent Growth and Survival in Tadpoles of Fowler's Toad,Anaxyrus fowleri: Volume vs. Abundance

Copeia ◽  
2016 ◽  
Vol 104 (4) ◽  
pp. 942-951 ◽  
Author(s):  
Katharine T. Yagi ◽  
David M. Green
Keyword(s):  
Growth And Survival ◽  
Density Dependent ◽  
Dependent Growth ◽  
Fowler's Toad

Growth rates of black caiman (Melanosuchus niger) and spectacled caiman (Caiman crocodilus) from two different Amazonian flooded habitats

2013 ◽  
Vol 34 (4) ◽  
pp. 437-449 ◽  
Author(s):  
Ronis Da Silveira ◽  
Zilca Campos ◽  
John Thorbjarnarson ◽  
William E. Magnusson
Keyword(s):  
Growth Rates ◽  
Biotic Interactions ◽  
Alligator Mississippiensis ◽  
Growth And Survival ◽  
Density Dependent ◽  
Demographic Models ◽  
Caiman Crocodilus ◽  
Dependent Growth ◽  
Rates Of Growth ◽  
Dependent Processes

Rates of growth and survival in wild populations are affected by the physical environment, biotic interactions, and density-dependent processes, such as growth and fecundity. However, the relative importance of these factors in long-lived reptiles is poorly understood. We analyzed growth rates of Melanosuchus niger and Caiman crocodilus coexisting in two areas of the Brazilian Amazon with very different environmental characteristics. Growth rates of Caiman crocodilus at the two sites were similar, but M. niger grew more slowly in the area with higher productivity and higher density of caimans. Growth rates of the same species from other sites and of the temperate-zone Alligator mississippiensis indicate large differences among sites, but little evidence that these differences are primarily due to differences in productivity or temperature. Demographic models used to estimate sustained yields from caiman harvests should take into account the likely importance of density-dependent growth.

scholarly journals Dispersal and density-dependent growth of Atlantic salmon (Salmo salar) juveniles: clumped versus dispersed stocking

2017 ◽  
Vol 74 (9) ◽  
pp. 1337-1347 ◽  
Author(s):  
Eric Blake Brunsdon ◽  
Dylan John Fraser ◽  
William Rundle Ardren ◽  
James William Angus Grant
Keyword(s):  
Growth Rate ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Negative Power ◽  
Growth And Survival ◽  
Density Dependent ◽  
Atlantic Salmon Salmo Salar ◽  
Nesting Sites ◽  
Juvenile Habitat ◽  
Dependent Growth

Dispersal from nesting sites and habitat selection are essential for the fitness of young individuals and shape the distribution, growth, and persistence of populations. These processes are important to consider when releasing young, hatchery-origin fishes into the wild to restore extirpated or depleted populations. By manipulating the density of released young-of-the-year (YOY) Atlantic salmon (Salmo salar), we evaluated the effects of clumped- (releasing all the fish at one location) and dispersed-stocking (releasing the fish evenly over a complete reach) treatments on juvenile habitat use, dispersal, growth, and survival. Across 14 river reaches, clump-stocked YOY density decreased and growth rate increased with distance downstream, whereas dispersed-stocked YOY densities and growth were relatively constant. Overall, density, spatial variance in density, growth, and survival did not differ between these two stocking treatments, likely due to the greater-than-expected mobility of fish in clumped-stocking reaches; YOY dispersed up to 1600 m, with 41% moving over 200 m downstream. As predicted from previous work, growth rate of individual fish was density-dependent, following a negative power curve. Our results provide insights into how the growth and survival of released individuals are altered via stocking treatments, ultimately shaping their distribution and growth rate.

Density‐dependent growth and survival in salmonids: Quantifying biological mechanisms and methodological biases

2020 ◽  
Vol 21 (3) ◽  
pp. 588-600
Author(s):  
Jean‐Michel Matte ◽  
Dylan J. Fraser ◽  
James W. A. Grant
Keyword(s):  
Biological Mechanisms ◽  
Growth And Survival ◽  
Density Dependent ◽  
Dependent Growth
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