scholarly journals Unpredictable perturbation reduces breeding propensity regardless of pre-laying reproductive readiness in a partial capital breeder

2016 ◽  
Vol 47 (6) ◽  
pp. 880-886 ◽  
Author(s):  
Pierre Legagneux ◽  
Holly L. Hennin ◽  
H. Grant Gilchrist ◽  
Tony D. Williams ◽  
Oliver P. Love ◽  
...  
Keyword(s):  
Capital Breeder ◽  
Breeding Propensity

Contrasted breeding strategies in four sympatric sibling insect species: when a proovigenic and capital breeder copes with a stochastic environment

2011 ◽  
Vol 26 (1) ◽  
pp. 198-206 ◽  
Author(s):  
Pierre-François Pélisson ◽  
Marie-Claude Bel-Venner ◽  
Benjamin Rey ◽  
Lorraine Burgevin ◽  
François Martineau ◽  
...  
Keyword(s):  
Insect Species ◽  
Breeding Strategies ◽  
Stochastic Environment ◽  
Capital Breeder

Breeding Propensity of Female Harlequin Ducks

2008 ◽  
Vol 72 (6) ◽  
pp. 1388-1393 ◽  
Author(s):  
Jeanine C. Bond ◽  
Daniel Esler ◽  
Tony D. Williams
Keyword(s):  
Harlequin Ducks ◽  
Breeding Propensity

scholarly journals Contrasting effects of the onset of spring on reproductive success of Arctic-nesting geese

The Auk ◽  
2019 ◽  
Vol 137 (1) ◽  
Author(s):  
Bart A Nolet ◽  
Kees H T Schreven ◽  
Michiel P Boom ◽  
Thomas K Lameris
Keyword(s):  
Population Dynamics ◽  
Late Onset ◽  
The Other ◽  
Second Phase ◽  
Combined Effects ◽  
Negative Effects ◽  
Early Snowmelt ◽  
The One ◽  
Winter Flocks ◽  
Breeding Propensity

Abstract Breeding output of geese, measured as the proportion of juveniles in autumn or winter flocks, is lower in years with a late onset of spring in some species, but higher in at least one other species. Here we argue that this is because the timing of spring affects different stages of the reproductive cycle differently in different species. Because the effects on 2 different stages are opposite, the combined effects can result in either a positive or a negative overall effect. These stages are the pre-laying, laying, and nesting phase on the one hand; and the hatchling, fledgling, and juvenile phase on the other hand. The first phase is predominantly positively affected by an early snowmelt, with higher breeding propensity, clutch size, and nest success. The second phase in contrast is negatively affected by early snowmelt because of a mismatch with a nutrient food peak, leading to slow gosling growth and reduced survival. We argue that recognition of this chain of events is crucial when one wants to predict goose productivity and eventually goose population dynamics. In a rapidly warming Arctic, the negative effects of a mismatch might become increasingly important.

scholarly journals Survival of Female Lesser Scaup: Effects of Body Size, Age, and Reproductive Effort

The Condor ◽  
2003 ◽  
Vol 105 (2) ◽  
pp. 336-347 ◽  
Author(s):  
Jay J. Rotella ◽  
Robert G. Clark ◽  
Alan D. Afton
Keyword(s):  
Body Size ◽  
Natural Selection ◽  
Female Body ◽  
Reproductive Effort ◽  
Cost Of Reproduction ◽  
Aythya Affinis ◽  
Female Body Size ◽  
Lesser Scaup ◽  
Adult Females ◽  
Breeding Propensity

AbstractIn birds, larger females generally have greater breeding propensity, reproductive investment, and success than do smaller females. However, optimal female body size also depends on how natural selection acts during other parts of the life cycle. Larger female Lesser Scaup (Aythya affinis) produce larger eggs than do smaller females, and ducklings from larger eggs survive better than those hatching from smaller eggs. Accordingly, we examined patterns of apparent annual survival for female scaup and tested whether natural selection on female body size primarily was stabilizing, a frequent assumption in studies of sexually dimorphic species in which males are the larger sex, or was directional, counteracting reproductive advantages of large size. We estimated survival using mark-recapture methods for individually marked females from two study sites in Canada (Erickson, Manitoba; St. Denis, Saskatchewan). Structurally larger (adults) and heavier (ducklings) females had lower survival than did smaller individuals in Manitoba; no relationship was detected in adults from Saskatchewan. Survival of adult females declined with indices of increasing reproductive effort at both sites; consequently, the cost of reproduction could explain age-related patterns of breeding propensity in scaup. Furthermore, if larger females are more likely to breed than are smaller females, then cost of reproduction also may help explain why survival was lower for larger females. Overall, we found that advantages of large body size of female scaup during breeding or as young ducklings apparently were counteracted by natural selection favoring lightweight juveniles and structurally smaller adult females through higher annual survival.Sobrevivencia de Aythya affinis: Efectos del Tamaño Corporal, Edad y Esfuerzo ReproductivoResumen. En las aves, las hembras de mayor tamaño generalmente presentan una mayor predisposición a la reproducción, mayor inversión reproductiva y mayor éxito que las hembras de menor tamaño. Sin embargo, el tamaño óptimo de la hembra también depende de cómo la selección natural opera durante otras etapas del ciclo de vida. Hembras de Aythya affinis más grandes producen huevos de mayor tamaño que hembras más pequeñas, y los polluelos provenientes de huevos más grandes sobreviven mejor que aquellos que eclosionan de huevos más pequeños. Consiguientemente, examinamos los patrones de sobrevivencia anual aparente para hembras de A. affinis y probamos si la selección natural sobre el tamaño del cuerpo de las hembras era principalmente estabilizadora (una suposición frecuente en estudios de especies sexualmente dimórficas en que los machos son el sexo mayor), o era direccional, contrarrestando las ventajas reproductivas de un tamaño mayor. Estimamos la sobrevivencia de hembras utilizando métodos de marcaje y recaptura en dos sitios de estudio (Erickson, Manitoba; St. Denis, Saskatchewan). Hembras estructuralmente más grandes (adultas) y más pesadas (polluelos) tuvieron una menor sobrevivencia que individuos más pequeños en Manitoba; no se detectó una relación entre adultos de Saskatchewan. En ambos sitios la sobrevivencia de hembras adultas decreció con los índices de incremento de esfuerzo reproductivo; consecuentemente el costo reproductivo podría explicar los patrones de predisposición reproductiva relacionados a la edad en A. affinis. Además, si las hembras de mayor tamaño presentan mayor probabilidad de reproducirse que las hembras pequeñas, entonces el costo reproductivo también podría ayudar a explicar porqué la sobrevivencia fue menor para hembras más grandes. En general encontramos que en las hembras de A. affinis las ventajas de un tamaño corporal grande durante la cría o como juveniles fueron aparentemente contrarestadas por la selección natural que favorece juveniles de peso liviano y hembras adultas estructuralmente más pequeñas a través de una mayor sobrevivencia anual.

Capital or income breeding crabs: who are the better invaders?

Crustaceana ◽  
2014 ◽  
Vol 87 (14) ◽  
pp. 1648-1656 ◽  
Author(s):  
Yiwen Zeng ◽  
Colin McLay ◽  
Darren C. J. Yeo
Keyword(s):  
Life History ◽  
Gonadosomatic Index ◽  
Carcinus Maenas ◽  
Breeding Strategy ◽  
Life History Trait ◽  
Hepatosomatic Index ◽  
Hemigrapsus Sanguineus ◽  
Life History Pattern ◽  
Income Breeding ◽  
Capital Breeder

A recent study by Griffen et al. (2012) drew a link between invasiveness and breeding strategy (income or capital breeding), a hitherto unconsidered life-history trait, in crabs. The methods used by the authors identified Carcinus maenas (Linnaeus, 1758) as a capital breeder and Hemigrapsus sanguineus (De Haan, 1853) as an income breeder. We extend this association of breeding strategies and invasiveness to other crab species and note that crabs in general are capital breeders based on the concurrent opposing trends of gonadosomatic index and hepatosomatic index during secondary vitellogenesis (indicating an endogenous source of nutrients for reproduction). We identify possible reasons why H. sanguineus may be regarded as an exception to this brachyuran life history pattern. Given that some species could be capable of a mixed breeding strategy, we propose experimental methods for determining such strategies.

scholarly journals Sperm depletion may not limit male reproduction in a capital breeder

2015 ◽  
Vol 116 (3) ◽  
pp. 684-690 ◽  
Author(s):  
Lindsey Swierk ◽  
Jennifer B. Tennessen ◽  
Tracy Langkilde
Keyword(s):  
Male Reproduction ◽  
Capital Breeder ◽  
Sperm Depletion

To breed or not: a novel approach to estimate breeding propensity and potential trade-offs in an Arctic-nesting species

Ecology ◽  
2014 ◽  
Vol 95 (10) ◽  
pp. 2745-2756 ◽  
Author(s):  
Guillaume Souchay ◽  
Gilles Gauthier ◽  
Roger Pradel
Keyword(s):  
Trade Offs ◽  
Novel Approach ◽  
Breeding Propensity

POSTOVULATORY FOLLICLES IN MALLARDS: IMPLICATIONS FOR ESTIMATES OF BREEDING PROPENSITY

The Condor ◽  
2006 ◽  
Vol 108 (4) ◽  
pp. 925 ◽  
Author(s):  
Eric B. Lindstrom ◽  
Michael W. Eichholz ◽  
John M. Eadie
Keyword(s):  
Breeding Propensity

Context dependency of baseline glucocorticoids as indicators of individual quality in a capital breeder

2013 ◽  
Vol 191 ◽  
pp. 231-238 ◽  
Author(s):  
Kim Jaatinen ◽  
Martin W. Seltmann ◽  
Tuula Hollmén ◽  
Shannon Atkinson ◽  
Kendall Mashburn ◽  
...  
Keyword(s):  
Context Dependency ◽  
Individual Quality ◽  
Capital Breeder
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