scholarly journals Influence of Body Size and Population Density on Fertilization Success and Reproductive Output in a Free-Spawning Invertebrate

1991 ◽  
Vol 181 (2) ◽  
pp. 261-268 ◽  
Author(s):  
D. R. Levitan
Keyword(s):  
Body Size ◽  
Population Density ◽  
Reproductive Output ◽  
Fertilization Success

An ecological explanation for hyperallometric scaling of reproduction

2021 ◽  
Author(s):  
Tomos Potter ◽  
Anja Felmy
Keyword(s):  
Body Size ◽  
Reproductive Output ◽  
Resource Competition ◽  
Natural Populations ◽  
Scaling Exponent ◽  
Wild Populations ◽  
Wet Season ◽  
Size Dependent ◽  
In The Wild ◽  
The Relationship

AbstractIn wild populations, large individuals have disproportionately higher reproductive output than smaller individuals. We suggest an ecological explanation for this observation: asymmetry within populations in rates of resource assimilation, where greater assimilation causes both increased reproduction and body size. We assessed how the relationship between size and reproduction differs between wild and lab-reared Trinidadian guppies. We show that (i) reproduction increased disproportionately with body size in the wild but not in the lab, where effects of resource competition were eliminated; (ii) in the wild, the scaling exponent was greatest during the wet season, when resource competition is strongest; and (iii) detection of hyperallometric scaling of reproduction is inevitable if individual differences in assimilation are ignored. We propose that variation among individuals in assimilation – caused by size-dependent resource competition, niche expansion, and chance – can explain patterns of hyperallometric scaling of reproduction in natural populations.

Fertilization success suggests random pairing in frogs with regard to body size

2021 ◽  
Vol 75 (10) ◽  
Author(s):  
Johana Goyes Vallejos ◽  
Johniah Gomez ◽  
Abner D. Hernández-Figueroa ◽  
Rebecca Vera ◽  
David M. Green
Keyword(s):  
Body Size ◽  
Fertilization Success ◽  
Random Pairing

Effects of population density on female and male burrow characteristics in the fiddler crab, Uca bengali Crane, 1975

Crustaceana ◽  
2015 ◽  
Vol 88 (12-14) ◽  
pp. 1283-1299 ◽  
Author(s):  
Fahmida Wazed Tina ◽  
Mullica Jaroensutasinee ◽  
Krisanadej Jaroensutasinee
Keyword(s):  
Body Size ◽  
Population Density ◽  
Fiddler Crab ◽  
High Density ◽  
The Other ◽  
Low Density ◽  
Density Effects ◽  
Egg Incubation ◽  
Other Hand ◽  
Males And Females

We examined the effects of population density on body size and burrow characteristics ofUca bengaliCrane, 1975. We predicted that (1) males in high-density areas (HD) should be larger in size and build higher quality burrows than males in low-density areas (LD), and (2) HD females should be larger in size, but build lower quality burrows than LD females, as HD females can find higher numbers of good quality male burrows around them for breeding and egg incubation. Our results showed that males and females in HD were larger in size than those in LD. Since HD males were larger in size, they built higher quality burrows than males in LD. On the other hand, even though LD females were smaller in size than HD ones, they built higher quality burrows than HD females. Our results thus indicate that density effects both body size and burrow characteristics.

Habitat-Related Variation in Body Size and Reproductive Output and an Examination of Reproductive Allometry in the Sabine Map Turtle (Graptemys sabinensis) across Three River Drainages

Copeia ◽  
2016 ◽  
Vol 104 (2) ◽  
pp. 458-468 ◽  
Author(s):  
Amy K. Fehrenbach ◽  
Irvin Louque ◽  
Stacy L. McFadden ◽  
Cybil Huntzinger ◽  
Eddie Lyons ◽  
...  
Keyword(s):  
Body Size ◽  
Reproductive Output ◽  
Related Variation ◽  
River Drainages

scholarly journals Is the relationship between population density and body size consistent across independent studies? A meta-analytical approach

2001 ◽  
Vol 61 (1) ◽  
pp. 1-6 ◽  
Author(s):  
L. M. BINI ◽  
A. S. G COELHO ◽  
J. A. F. DINIZ-FILHO
Keyword(s):  
Body Size ◽  
Population Density ◽  
Regression Model ◽  
Phylogenetic Relationships ◽  
Analytical Approach ◽  
Analytical Procedure ◽  
Significant Heterogeneity ◽  
Sampling Variation ◽  
Homogeneity Hypothesis ◽  
The Relationship

The Energetic Equivalence Rule (EER) is a controversial issue in ecology. This rule states that the amount of energy that each species uses per unit of area is independent of its body size. Here, we perform a meta-analytical procedure to combine and compare the slopes of population density and body size relationships across independent studies of mammals and birds. We then compared a distribution of 50,000 bootstrap combined slopes with the expected slope (b = -0.75) under the EER. The combined slopes obtained for mammals and birds separately were -0.755 and -0.321, respectively. The homogeneity hypothesis (i. e. within studies the slopes differ by no more than would be expected due sampling variation) was rejected in both cases. So, EER cannot be supported since the use of an exponent of -0.75 is, in fact, an oversimplification. Significant heterogeneity of slopes within each group (mammals and birds) is an indicator of inferential problems related with variation in body size, spatial scale, the regression model adopted and phylogenetic relationships among species. So, we consider that questions regarding the estimation and validity of slopes is the next challenge of density-body size relationship studies.

Body Size with Relation to Population Density in Mammals

1955 ◽  
Vol 36 (4) ◽  
pp. 493 ◽  
Author(s):  
Victor B. Scheffer
Keyword(s):  
Body Size ◽  
Population Density

scholarly journals Body Size Correlates with Fertilization Success but not Gonad Size in Grass Goby Territorial Males

PLoS ONE ◽  
2012 ◽  
Vol 7 (10) ◽  
pp. e46711 ◽  
Author(s):  
Jose Martin Pujolar ◽  
Lisa Locatello ◽  
Lorenzo Zane ◽  
Carlotta Mazzoldi
Keyword(s):  
Body Size ◽  
Fertilization Success ◽  
Gonad Size ◽  
Grass Goby

scholarly journals Antler and Body Size in Black-Tailed Deer: An Analysis of Cohort Effects

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Johanna C. Thalmann ◽  
R. Terry Bowyer ◽  
Ken A. Aho ◽  
Floyd W. Weckerly ◽  
Dale R. McCullough
Keyword(s):  
Body Size ◽  
Population Density ◽  
Odocoileus Hemionus ◽  
The Body ◽  
Cohort Effects ◽  
Odocoileus Hemionus Columbianus ◽  
Extrinsic Factors ◽  
Large Herbivores ◽  
Female Population ◽  
Antler Size

For long-lived species, environmental factors experienced early in life can have lasting effects persisting into adulthood. Large herbivores can be susceptible to cohort-wide declines in fitness as a result of decreases in forage availability, because of extrinsic factors, including extreme climate or high population densities. To examine effects of cohort-specific extrinsic factors on size of adults, we performed a retrospective analysis on harvest data of 450 male black-tailed deer (Odocoileus hemionus columbianus) over 19 years in central California, USA. We determined that population density of females had a more dominant effect than did precipitation on body size of males. Harvest of female deer resulted in increases in the overall size of males, even though a 6-year drought occurred during that treatment period. Body size was most influenced by female population density early in life, while antler size was highly affected by both weather early in life and the year directly before harvest. This study provides insights that improve our understanding of the role of cohort effects in body and antler size by cervids; and, in particular, that reduction in female population density can have a profound effect on the body and antler size of male deer.

Sign in / Sign up

Export Citation Format

Share Document