Reproductive Success of Dunnocks, Prunella modularis, in a Variable Mating System. I. Factors Influencing Provisioning Rate, Nestling Weight and Fledging Success

10.2307/4697 ◽  
1986 ◽  
Vol 55 (1) ◽  
pp. 123 ◽  
Author(s):  
N. B. Davies
Keyword(s):  
Reproductive Success ◽  
Mating System ◽  
Fledging Success ◽  
Factors Influencing ◽  
Provisioning Rate

Settlement patterns, foraging behavior, and reproductive success of ospreys along a heterogeneous riverine corridor

2007 ◽  
Vol 85 (1) ◽  
pp. 56-62 ◽  
Author(s):  
Peter J. Harmata ◽  
Marco Restani ◽  
Alan R. Harmata
Keyword(s):  
Reproductive Success ◽  
Foraging Behavior ◽  
Settlement Patterns ◽  
Missouri River ◽  
Nest Density ◽  
River Section ◽  
Pandion Haliaetus ◽  
Factors Influencing ◽  
Spatial Use ◽  
Gill Netting

In 1998 and 1999, we determined the spatial distribution, foraging behavior, and reproductive success of ospreys ( Pandion haliaetus (L., 1758)) nesting along the upper Missouri River, Montana. We combined our data with that collected in the same area in 1981–1982 and 1990–1991 to investigate factors influencing settlement patterns. The study area was composed of four distinct habitats, three reservoirs and one free-flowing river section. Although number of occupied nests on each habitat increased from 1981–1982 to 1998–1999, the greatest percentage increases in nest density occurred on habitats previously hypothesized to contain the least prey. Osprey reproductive success was positively related to foraging rates, which differed across habitats, being highest on reservoirs and lowest on the free-flowing river. However, reproductive success was adequate for replacement on each habitat. Most fish consumed by ospreys on each habitat were suckers (Catostomidae), followed by salmonids and cyprinids. Fish density, determined from gill netting, was highest on the largest and shallowest reservoir. Over two decades, ospreys shifted their relative spatial use of the upper Missouri River such that reservoirs were occupied first and the free-flowing river section was occupied last. The degree to which presence of conspecifics, distribution of nest trees and prey, and dispersal affected settlement patterns probably varied by spatial scale.

Variation in reproductive success of male and female Columbian ground squirrels (Urocitellus columbianus)

2012 ◽  
Vol 90 (6) ◽  
pp. 736-743 ◽  
Author(s):  
Philip H. Jones ◽  
Jeffrey L. Van Zant ◽  
F. Stephen Dobson
Keyword(s):  
Reproductive Success ◽  
Mating System ◽  
Multiple Paternity ◽  
Ground Squirrels ◽  
Male Reproductive Success ◽  
Offspring Production ◽  
Bateman Gradient ◽  
Coefficients Of Variation ◽  
Males And Females ◽  
Columbian Ground Squirrels

The imbalanced reproductive success of polygynous mammals results in sexual selection on male traits like body size. Males and females might have more balanced reproductive success under polygynandry, where both sexes mate multiply. Using 4 years of microsatellite DNA analyses of paternity and known maternity, we investigated variation in reproductive success of Columbian ground squirrels, Urocitellus columbianus (Ord, 1815); a species with multiple mating by both sexes and multiple paternity of litters. We asked whether male reproductive success was more variable than that of females under this mating system. The overall percentage of confirmed paternity was 61.4% of 339 offspring. The mean rate of multiple paternity in litters with known fathers was 72.4% (n = 29 litters). Estimated mean reproductive success of males (10.27 offspring) was about thrice that of females (3.11 offspring). Even after this difference was taken into account statistically, males were about three times as variable in reproductive success as females (coefficients of variation = 77.84% and 26.74%, respectively). The Bateman gradient (regression slope of offspring production on number of successful mates) was significantly greater for males (βM = 1.44) than females (βF = 0.28). Thus, under a polygynandrous mating system, males exhibited greater variation in reproductive success than females.

Riverine characteristics and adult demography influence female lake sturgeon (Acipenser fulvescens) spawning behavior, reproductive success, and ovarian quality

2019 ◽  
Vol 76 (7) ◽  
pp. 1147-1160 ◽  
Author(s):  
Kari J. Dammerman ◽  
Molly A.H. Webb ◽  
Kim T. Scribner
Keyword(s):  
Reproductive Success ◽  
Behavioral Plasticity ◽  
Lake Sturgeon ◽  
Operational Sex Ratio ◽  
Plasma Testosterone ◽  
Acipenser Fulvescens ◽  
Reproductive Costs ◽  
Arrival Date ◽  
Factors Influencing ◽  
Yearly Means

Abiotic conditions and demographic factors can influence the timing of spawning. Behavioral plasticity allows females to select spawning conditions that are conducive to offspring development; however, reproductive costs associated with delaying spawning are not well understood. In this study, factors influencing timing of female spawning, residence time (RT), and reproductive success (RS) during two seasons were determined, and plasma testosterone concentrations were used to quantify atretic rates in a wild, lake sturgeon (Acipenser fulvescens) population. For the 123 females monitored, RT ranged from 1 to 23 days and was influenced by arrival date, temperature, discharge, and male number, with the latter having the largest influence. RS varied due to arrival date, temperature, discharge, male number, male length, and operational sex ratio. Two females had testosterone levels indicative of atresia and RS estimates lower than yearly means; however, most females had normal ovaries, suggesting little reproductive costs of plasticity in spawning ground residency time. Results demonstrate the multitude of factors influencing female reproductive behavior and RS, highlighting the importance of abiotic and demographic conditions to recruitment in wild populations.

scholarly journals Genetic evidence for the mating system and reproductive success of black sea bream ( Acanthopagrus schlegelii )

2020 ◽  
Vol 10 (10) ◽  
pp. 4483-4494
Author(s):  
Xi Wang ◽  
Su Liu ◽  
Yuqing Yang ◽  
Lina Wu ◽  
Wenhua Huang ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Mating System ◽  
Black Sea ◽  
Genetic Evidence ◽  
Sea Bream ◽  
Acanthopagrus Schlegelii

Age-related variation in song repertoire size and repertoire sharing of yellow warblers (Dendroica petechia)

1986 ◽  
Vol 64 (9) ◽  
pp. 1926-1929 ◽  
Author(s):  
Susan E. Cosens ◽  
Spencer G. Sealy
Keyword(s):  
Reproductive Success ◽  
Dendroica Petechia ◽  
Repertoire Size ◽  
Song Repertoire ◽  
Fledging Success ◽  
Related Variation ◽  
Age Related ◽  
Yellow Warblers ◽  
Clutch Initiation

Songs of male yellow warblers (Dendroica petechia), ranging from 1 to 6 years of age, were recorded in the spring and summer of 1984. Recorded repertoire size and number of songs shared with neighbours varied positively with age in the spring but not in summer. Neither clutch initiation date nor fledging success varied with age or number of songs shared but both measures of reproductive success varied with size of recorded song repertoire.

scholarly journals Feather carotenoid content is correlated with reproductive success and provisioning rate in female Prothonotary Warblers

The Auk ◽  
2017 ◽  
Vol 134 (1) ◽  
pp. 229-239 ◽  
Author(s):  
Lesley P. Bulluck ◽  
Miran J. Foster ◽  
Samantha Kay ◽  
Donald E. Cox ◽  
Catherine Viverette ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Carotenoid Content ◽  
Provisioning Rate ◽  
Prothonotary Warblers
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