scholarly journals Environmentally mediated reproductive success predicts breeding dispersal decisions in an early successional amphibian

2018 ◽  
Author(s):  
Laurent Boualit ◽  
Julian Pichenot ◽  
Aurélien Besnard ◽  
Rémi Helder ◽  
Pierre Joly ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Environmental Conditions ◽  
Breeding Success ◽  
Patch Size ◽  
Negative Influence ◽  
Ecological Succession ◽  
Structured Populations ◽  
Breeding Dispersal ◽  
Capture Recapture ◽  
Context Dependent

AbstractDispersal is a central mechanism in ecology and evolution. Dispersal evolution is driven by a trade-off between costs and benefits, which is influenced by inter-individual variability and local environmental conditions (context-dependent dispersal). Many studies have investigated how dispersal decisions may be influenced by environmental factors, including density, predation, and interspecific competition. Yet few have attempted to examine how habitat disturbance may affect the dispersal process in spatially structured populations. In early successional species, one might expect individuals to adjust their dispersal decisions based on two main factors that potentially have an influence on reproductive success: patch size and the level of patch disturbance. In this study, we examined how these two factors affect breeding success and dispersal decisions in an early successional amphibian, the yellow-bellied toad (Bombina variegata). To this end, we used capture–recapture data collected on a spatially structured population occupying 28 breeding patches. We took advantage of recent developments in multievent capture–recapture models to detect signs of context-dependent dispersal. The results revealed that the probability of successful reproduction and the number of newly metamorphosed individuals increased with both the size and the proportion of disturbance of a patch. In addition, our results showed that the factors affecting breeding success also influenced breeding dispersal probability. Large patch size negatively influenced emigration probability; in contrast, it positively influenced immigration probability. Equally, higher disturbance (in terms of the proportion of the patch’s surface area disturbed each year) had a strong negative influence on emigration probability and slightly positively affected immigration probability. These findings strongly suggest that individuals make context-dependent dispersal decisions, adjusted to maximize future fitness prospects in a patch, allowing them to better cope with rapid changes in environmental conditions resulting from the ecological succession process. This opens new areas of potential research into the role of dispersal in organism specialization along an ecological succession gradient.

scholarly journals Prior Breeding Success Affects Return Rates of Territorial Male Ovenbirds

The Condor ◽  
2003 ◽  
Vol 105 (1) ◽  
pp. 73-79 ◽  
Author(s):  
Paul A. Porneluzi
Keyword(s):  
Reproductive Success ◽  
Breeding Success ◽  
Territorial Male ◽  
Breeding Dispersal ◽  
Seiurus Aurocapillus ◽  
Return Rates ◽  
Breeding Experience ◽  
A Site

AbstractI examined the hypothesis that male Ovenbirds (Seiurus aurocapillus) make breeding dispersal decisions based on prior breeding experience at a site. I determined the reproductive success of color-banded male Ovenbirds at sites in fragmented and unfragmented landscapes in Missouri from 1992–1995. I documented which individuals returned and I recorded their reproductive success upon return as well as the success of birds new to each plot. I obtained similar results in both landscapes. Males with different histories of reproductive success returned at different rates. Only 2 of 22 males that were paired but failed to raise young returned in the following year, whereas the return rates of unpaired males (41%, n = 37) and males that successfully raised young (54%, n = 57) did not differ significantly (P = 0.19). The patterns were more consistent with the hypothesis that return rates were due to decisions about dispersal rather than difference in survival of individuals in these groups.El Éxito Reproductivo Previo Afecta Índices de Regreso de Machos Territoriales de Seiurus aurocapillusResumen. Examiné la hipótesis de que individuos de Seiurus aurocapillus hacen decisiones de dispersión reproductiva basadas en las experiencias reproductivas previas en un sitio. Determiné el éxito reproductivo de machos con anillos de color en lugares en terrenos fragmentados y no fragmentados de Missouri entre 1992 y 1995. Documenté cuáles individuos regresaron y su éxito reproductivo al regresar, y también el éxito de pájaros nuevos en cada sitio. Obtuve resultados semejantes en ambos paisajes. Los machos con historias de éxito reproductivo diferentes presentaron índices de regreso diferentes. Solamente 2 de 22 machos apareados que no produjeron cría volvieron al año siguiente, mientras que los índices de regreso de machos no apareados (41%, n = 37) y de los machos que produjeron crías exitosamente (54%, n = 57) no difirieron significativamente (P = 0.19). Los patrones concuerdan más con la hipótesis de que los índices de regreso se deberieron a las decisiones de dispersión y no a la diferencia de supervivencia de individuos en estos grupos.

scholarly journals Assessment of individual and conspecific reproductive success as determinants of breeding dispersal of female tree swallows: A capture–recapture approach

2017 ◽  
Vol 7 (18) ◽  
pp. 7334-7346 ◽  
Author(s):  
Paméla Lagrange ◽  
Olivier Gimenez ◽  
Blandine Doligez ◽  
Roger Pradel ◽  
Dany Garant ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Breeding Dispersal ◽  
Tree Swallows ◽  
Female Tree ◽  
Capture Recapture

scholarly journals Environmental conditions but not nest composition affect reproductive success in an urban bird

2021 ◽  
Vol 11 (7) ◽  
pp. 3084-3092
Author(s):  
Pablo Capilla‐Lasheras ◽  
Blanca Bondía ◽  
José I. Aguirre
Keyword(s):  
Reproductive Success ◽  
Environmental Conditions ◽  
Urban Bird

scholarly journals Lifetime reproductive success in a population of female red kangaroos Macropus rufus in the sheep rangelands of western New South Wales: Environmental effects and population dynamics

2004 ◽  
Vol 26 (1) ◽  
pp. 45 ◽  
Author(s):  
AD Bilton ◽  
DB Croft
Keyword(s):  
Population Dynamics ◽  
Reproductive Success ◽  
Environmental Conditions ◽  
New South ◽  
New South Wales ◽  
Reproductive Potential ◽  
Lifetime Reproductive Success ◽  
South Wales ◽  
Macropus Rufus ◽  
Initial Starting

Female reproductive success and the recruitment of offspring to the next generation are key components of animal population dynamics. With an annual commercial harvest of between 13 and 22% of the red kangaroo (Macropus rufus) population, it is increasingly important that these processes are understood. We used data on the reproductive success of 33 free-ranging female M. rufus on Fowlers Gap station in far western New South Wales to determine the expected lifetime reproductive success (LRS) of females within an unharvested population. We also designed a model to generate predictions about female LRS incorporating empirical relationships between a mother?s reproductive success and maternal age, environmental conditions and the sex and survivorship of a previous reproductive attempt. Results from observations on female LRS (calculated from annual weaning rates) and those generated by the model predict that female M. rufus on ?Fowlers Gap? wean, on average, 3.7 young in a lifetime (ranges 0 - 11 and 0 - 20, respectively); representing only 41% of their maximum reproductive potential. Manipulation of initial starting conditions allowed the effect of varying environmental conditions on female LRS to be explored. The condition of the environment when females commence breeding does not appear to significantly affect their overall lifetime reproductive output. However, the occurrence of drought does. Females experiencing two droughts in a lifetime did not live as long and weaned fewer offspring and grandoffspring (from their daughters) than those females experiencing only one drought in a lifetime. In addition to the adverse effect of drought on the reproductive success of female M. rufus in this study, we suggest that, given the relatively high and stable population densities of M. rufus on ?Fowlers Gap?, other mechanisms (acting primarily on juvenile survival) must exist which limit population growth.

scholarly journals Phytocoenology and Population Structure of Species of the Genus Malva L. in the Ganja-Gazakh Region (Azerbaijan)

2021 ◽  
Vol 7 (12) ◽  
Author(s):  
A. Nasirovа
Keyword(s):  
Population Structure ◽  
Environmental Conditions ◽  
Integral Characteristic ◽  
Negative Influence ◽  
Demographic Structure ◽  
Malva Sylvestris ◽  
Malva Parviflora ◽  
The Republic

The article presents the results of a study of the mallow genus — Malva L. characteristic of the meadow vegetation of the Ganja-Gazakh region of the Republic of Azerbaijan. From 11 species of the genus Malva L. distributed on the territory of Azerbaijan, 4 species (Malva sylvestris L., Malva nicaeensis All., Fl. Pedem, Malva pusilla Sm., Malva parviflora L.) are found in the Ganja-Gazakh region. The species M. parviflora was first identified by us in this territory. The species M. parviflora and M. sylvestris are not widely distributed in this territory. The structure of populations of M. pusilla and M. nicaeensis species was studied. 7 populations in which M. pusilla and M. nicaeensis species are distributed were phytocoenological evaluated. 3 cenopopulations in which the species M. nicaeensis is common were evaluated in different years. All groups of plant ontogenesis are found in the studied populations. It was found that in different years in the populations of these two species of the genus mallow, recovery is weak, and aging is intense. During the analysis of the population structure, reproduction indices — Ib and aging — Iq were determined, which are important population indicators. The integral characteristic of the demographic structure of M. pusilla and M. nicaeensis species is determined, the populations are estimated, the composition, age (height) and the degree of effectiveness of their ontogenesis are studied. The dynamics of changing ontogenesis in the cenopopulations of M. pusilla and M. nicaeensis species in various environmental conditions, depending on the positive or negative influence of its factors on the structure of ontogenesis, is revealed.

scholarly journals Environmental conditions during winter predict age- and sex-specific differences in reproductive success of a trans-Saharan migratory bird

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
C. López-Calderón ◽  
K. A. Hobson ◽  
A. Marzal ◽  
J. Balbontín ◽  
M. Reviriego ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Environmental Conditions ◽  
Migratory Bird ◽  
Age And Sex

Influence of weather on two insectivorous bats in a temperate Pacific Northwest rainforest

2009 ◽  
Vol 87 (2) ◽  
pp. 132-138 ◽  
Author(s):  
D. W. Burles ◽  
R. M. Brigham ◽  
R. A. Ring ◽  
T. E. Reimchen
Keyword(s):  
Reproductive Success ◽  
Pacific Northwest ◽  
Weather Conditions ◽  
Negative Influence ◽  
Myotis Lucifugus ◽  
Insectivorous Bats ◽  
Ambient Temperatures ◽  
The Pacific ◽  
Adverse Weather ◽  
Insect Activity

Adverse weather conditions frequently have a significant negative influence on survival and reproductive success of insectivorous bats. Low ambient temperatures increase the energetic costs of maintaining euthermia and reduces insect activity, while precipitation likely adds “clutter” making prey more difficult to detect using echolocation. We studied two species of insectivorous bats, Myotis lucifugus (LeConte, 1831) and Myotis keenii (Merriam, 1895), in the Pacific Northwest of Canada, a region that experiences frequent cool, wet weather during spring and summer. Our study took place during the El Niño – La Niña cycle of 1998–1999, which resulted in contrasting years. The summer of 1998 was unusually warm and dry, while the summer of 1999 was unusually cool and wet. We predicted that both species would be adversely affected by the cool, wet conditions of 1999, resulting in prolonged gestation, late fledging of young, and lower reproductive success. However, this was not the case. Myotis lucifugus did experience delays in reproductive timing and lower reproductive success in 1999, as predicted, whereas M. keenii experienced much shorter gestations, earlier fledgings, and no difference in reproductive success between years. We hypothesize that the ability of M. keenii to glean prey enables it to better cope with cool, wet conditions.

scholarly journals Genetic and molecular basis of floral induction in Arabidopsis thaliana

2020 ◽  
Vol 71 (9) ◽  
pp. 2490-2504 ◽  
Author(s):  
Atsuko Kinoshita ◽  
René Richter
Keyword(s):  
Arabidopsis Thaliana ◽  
Reproductive Success ◽  
Environmental Conditions ◽  
Molecular Basis ◽  
Recent Progress ◽  
Molecular Mechanisms ◽  
Floral Induction ◽  
Life Cycles ◽  
Complex Processes ◽  
Technological Advances

Abstract Many plants synchronize their life cycles in response to changing seasons and initiate flowering under favourable environmental conditions to ensure reproductive success. To confer a robust seasonal response, plants use diverse genetic programmes that integrate environmental and endogenous cues and converge on central floral regulatory hubs. Technological advances have allowed us to understand these complex processes more completely. Here, we review recent progress in our understanding of genetic and molecular mechanisms that control flowering in Arabidopsis thaliana.

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