Article
Veterinary Sciences
William D. Barkman, Joanne H. Connolly, Geoffrey J. Dutton, Hayley J. Stannard, Ann Carstens
Summary: The purpose of this study was to describe the ultrasonographic anatomy of the abdominal organs in healthy juvenile eastern grey kangaroos and to develop a systematic approach for abdominal ultrasonographic evaluation. The study revealed ultrasonographic differences in anatomy compared to other species, and the findings provide a foundation for the ultrasonographic diagnosis of abdominal disease in kangaroos.
VETERINARY RADIOLOGY & ULTRASOUND
(2023)
Article
Zoology
Maquel E. Brandimarti, Rachael Gray, Zoe J. Hilton, Tamara Keeley, 'Kangaroo' Phil Murray, Catherine A. Herbert
Summary: The study successfully suppressed testosterone levels in male eastern grey kangaroos using a novel vaccine, resulting in a significant reduction in testes size. However, a 10-week period of suppression did not have a detectable effect on parasite burden or core area use.
AUSTRALIAN MAMMALOGY
(2022)
Article
Biology
Manuela Ferrari, Anna K. Lindholm, Arpat Ozgul, Madan K. Oli, Barbara Konig
Summary: Optimal reproductive strategies are influenced by both intrinsic state and extrinsic environment, and conditional breeding tactics can maximize fitness. Through an 8-year study of house mice, it was found that communal breeding reduced average population fitness, but showed an increase over time. The expression of this tactic was conditionally dependent on population density and female body mass.
COMMUNICATIONS BIOLOGY
(2022)
Article
Ecology
Thomas V. Riecke, Johann Hegelbach, Michael Schaub
Summary: An understanding of the drivers of individual fitness is crucial for evolutionary ecology and life-history theory. This study used long-term data on white-throated dippers in Switzerland to investigate the effects of parental age, mating tactic, and individual heterogeneity on reproductive success. The results showed that reproductive parameters such as polygyny, hatching probability, and offspring survival were influenced by age and mating tactic, indicating the importance of these factors in determining individual fitness.
JOURNAL OF ANIMAL ECOLOGY
(2023)
Article
Ecology
Verane Berger, Sophie Reichert, Mirkka Lahdenpera, John Jackson, Win Htut, Virpi Lummaa
Summary: Interactions between siblings can influence the phenotype, survival, body condition, and reproductive success of offspring. Elder siblings have heterogeneous effects on subsequent offspring, with elder sisters showing a greater impact on focal siblings than elder brothers. Sibling effects vary depending on the sex of the siblings and subsequent offspring, highlighting the general complexity of sibling influences on life-history trajectories.
JOURNAL OF ANIMAL ECOLOGY
(2021)
Article
Cell Biology
Saoirse McMahon, Magdalena Matzke, Cristina Tuni
Summary: Research found negative effects of food limitation but no significant impact on the costs of ejaculate production. High mating rates may drive males to maximize their capacity of ejaculate production, reducing the likelihood of trade-offs with other fitness-related traits.
Article
Behavioral Sciences
Kyle J. Lloyd, W. Chris Oosthuizen, Jay J. Rotella, Marthan N. Bester, P. J. Nico de Bruyn
Summary: Through studying male southern elephant seals, it was found that resource allocation decisions of polygynous males are influenced by density-related factors, which have important effects on survival, breeding success, and recruitment age. Males allocate more resources to reproduction and less to body maintenance when defending and servicing larger harems, and this cost is compounded for males that dominate large harems at a young age. Population density during early life has lasting effects on breeding success and recruitment age, indicating the interaction between density-dependent factors and intrinsic determinants of resource allocation.
Article
Behavioral Sciences
Jon Richardson, Per T. Smiseth
Summary: Differential allocation refers to the adjustment of reproductive allocation by a female in response to the quality of her male partner. This study used a novel cross-fostering design to investigate the effects of differential allocation on trade-offs between reproductive traits within breeding attempts. Results showed that females mating with food-deprived males had fewer larvae, and there was a shift in the relationship between number and size of larvae depending on the male's nutritional condition.
BEHAVIORAL ECOLOGY
(2021)
Article
Ecology
Robin S. Waples
Summary: For species with overlapping generations, the widely used method to calculate effective population size (Ne) is Hill's model, which relies on the variance in offspring number. This study evaluated the robustness of Hill's model to extreme patterns of reproductive success and demonstrated its accuracy in predicting genetic drift in simulated populations even under extreme reproductive scenarios.
Article
Economics
Natalie Chen, Luciana Juvenal
Summary: This paper examines the impact of geographic distance or bilateral tariffs on the markups of quality-differentiated exports. The study finds that exporters practice price discrimination by adjusting markups in different markets. However, the response of markups to changes in trade costs is heterogeneous and weaker for higher quality exports.
JOURNAL OF INTERNATIONAL ECONOMICS
(2022)
Article
Zoology
I Fernandez-Rodriguez, F. Brana
Summary: Autotomy is the ability of animals to shed a body part when attacked by predators, followed by regeneration. Regeneration is a costly process that can affect growth, reserves, and reproduction. Experiments on female wall lizards showed that regenerating females had lower clutch mass relative to body length, with a greater effect in the short-term experiment. In the short-term experiment, the amount of tail regenerated was negatively correlated with reproductive investment, and regenerating females had higher egg failure rates.
JOURNAL OF ZOOLOGY
(2022)
Article
Plant Sciences
Nurbiye Ehmet, Yu-pei Wang, Xiang Zhao, Da Wei Chen, Kun Sun, Qin-Zheng Hou
Summary: The study found that variations in environmental factors and corresponding pollinators in different seasons lead to different phenotypes of Trifolium repens, ultimately resulting in divergence in plant reproductive traits. T. repens can adjust investments in two reproductive modes according to different environments, thereby regulating overall fitness.
Article
Multidisciplinary Sciences
Marina F. Millan, Juan Carranza, Jose M. Seoane, Javier Perez-Gonzalez
Summary: This study investigated the impact of climate change on red deer reproduction. The results showed that poor vegetation availability during dry years led to worse body condition in deer, delayed rutting season, and lower reproductive success. Additionally, consecutive years of resource conditions also affected breeding season, as abundant resources in the previous year led to delayed breeding and poor resources in the following year hindered recovery, resulting in a later rutting season.
Article
Plant Sciences
Wagner Luiz dos Santos, Katia Cavalcanti Porto, Jucara Bordin, Fabio Pinheiro, Irene Bisang
Summary: This study examined the relationship between reproductive allocation and vegetative growth in three sexual systems of bryophytes. It found that reproductive allocation differs between sexes and sexual systems, and that it is negatively related to vegetative growth. However, these relationships may differ for truly monoicous species with shorter intersexual distances, so further research and comparison are needed.
Article
Entomology
Koutaro Ould Maeno, Cyril Piou, Said Ghaout
Summary: The desert locust shows a density-dependent reproductive trade-off by laying fewer but larger eggs in crowded conditions. The ovulation timing and oosorption rate are influenced by maternal density, and these modifications in physiology regulate the reproductive trade-off in the locust.
JOURNAL OF INSECT PHYSIOLOGY
(2022)
Article
Biodiversity Conservation
Yoanna Poisson, Marco Festa-Bianchet, Fanie Pelletier
JOURNAL OF APPLIED ECOLOGY
(2020)
Article
Rheumatology
Jessica L. Fairley, Dylan Hansen, Susanna Proudman, Joanne Sahhar, Gene-Siew Ngian, Jenny Walker, Gemma Strickland, Michelle Wilson, Kathleen Morrisroe, Nava Ferdowsi, Gabor Major, Janet Roddy, Wendy Stevens, Mandana Nikpour
Summary: This study describes the clinical characteristics and outcomes of patients with SSc-MCTD, SSc overlap, and SSc only, revealing that anti-RNP antibodies are associated with better survival.
ARTHRITIS CARE & RESEARCH
(2021)
Article
Behavioral Sciences
Luca Montana, Francois Rousseu, Dany Garant, Marco Festa-Bianchet
BEHAVIORAL ECOLOGY
(2020)
Article
Biology
A. V. Jaeggi, M. I. Miles, M. Festa-Bianchet, C. Schradin, L. D. Hayes
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2020)
Article
Rheumatology
A. Y. S. Lee, K. A. Patterson, D. J. Tan, M. E. Wilson, S. M. Proudman, W. Stevens, M. Nikpour, J. Sahhar, G-S Ngian, J. Roddy, P. J. Roberts-Thomson, J. G. Walker
Summary: The study found that anti-Ro52/TRIM21 was independently associated with pulmonary arterial hypertension (PAH) and increased mortality risk in systemic sclerosis (SSc) patients, but not with interstitial lung disease (ILD) or other indicators of pulmonary involvement. Future longitudinal studies are recommended to investigate the timing and pathogenic mechanisms of this autoantibody in PAH.
SCANDINAVIAN JOURNAL OF RHEUMATOLOGY
(2021)
Article
Ecology
Yanny Ritchot, Marco Festa-Bianchet, David Coltman, Fanie Pelletier
Summary: In bighorn sheep, the reproductive success of males aged 3 years is positively correlated with body mass, the proportion of 2-4 year old males, and the number of available females. Known reproduction before the age of five increases lifetime reproductive success but decreases longevity, indicating a long-term survival cost.
ECOLOGY AND EVOLUTION
(2021)
Article
Behavioral Sciences
Benjamin Larue, Fanie Pelletier, Marco Festa-Bianchet
Summary: The study on resource acquisition behaviors in bighorn sheep found that bite rate and rumination effort increased with lactation allocation. Bite rate and rumination behaviors were found to be repeatable, but contrary to predictions, no significant correlation was found between them.
Article
Biodiversity Conservation
Limoilou-Amelie Renaud, Marco Festa-Bianchet, Fanie Pelletier
Summary: In species with long gestation periods like bighorn sheep, autumn temperature and precipitation drive the timing of parturition, while vegetation phenology does not have a significant impact. The mismatch between individual parturition date and spring green-up fluctuates over time but does not show a clear trend, and it negatively affects lamb weaning mass. The study suggests that the consequences of phenological mismatch on fitness may vary depending on the species' life history, emphasizing the complexity in assessing trophic mismatches under the context of climate change.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Ecology
Michelle Wilson, Graeme Coulson
Summary: Unchecked macropods can exhibit irruptive population dynamics with rapid rise to peak and subsequent crash due to inadequate resources. Management decisions are often guided by estimates of population density, which may be difficult to obtain accurately. Monitoring vital rates like female reproductive rate and sex ratio can serve as useful indicators for predicting population growth trajectory and identifying potential management issues.
ECOLOGICAL MANAGEMENT & RESTORATION
(2021)
Article
Ecology
Claire Wimpenny, Lyn A. Hinds, Catherine A. Herbert, Michelle Wilson, Graeme Coulson
Summary: Fertility control is an effective method for managing overabundant macropod populations, including surgical techniques, hormonal implants, and immunocontraceptive vaccines. Levonorgestrel and GonaCon are the most suitable methods for free-ranging macropods. However, research on the impact of fertility control on macropod population growth rates is still limited.
ECOLOGICAL MANAGEMENT & RESTORATION
(2021)
Article
Ecology
Iain Gordon, Melissa Snape, Don Fletcher, Brett Howland, Graeme Coulson, Marco Festa-Bianchet, Peter Caley, Sue McIntyre, Tony Pople, Claire Wimpenny, Greg Baines, Doug Alcock
Summary: Populations of macropods in many parts of Australia are higher than estimated, prompting the use of multi-tenure kangaroo management units and adaptive management frameworks to achieve appropriate densities in the nature reserves of the Australian Capital Territory. Monitoring vegetation status and adjusting culling measures accordingly is recommended to achieve conservation objectives, with potential insights for kangaroo management in other temperate areas of Australia.
ECOLOGICAL MANAGEMENT & RESTORATION
(2021)
Article
Behavioral Sciences
Luca Montana, Wendy J. King, Graeme Coulson, Dany Garant, Marco Festa-Bianchet
Summary: This study investigates the relationship between male dominance and reproductive success in a population of eastern grey kangaroos. The results suggest that body size and weapons are important determinants of dominance status and male reproductive success, although other traits also play a considerable role. Despite a clear-cut dominance hierarchy and strong sexual selection, monopolization of reproduction by the most dominant males is weak in this species.
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
(2022)
Article
Ecology
Roxane Lassis, Marco Festa-Bianchet, Fanie Pelletier
Summary: In some species, male mating success depends on intrasexual competition, and males can adopt migratory or resident strategies to seek breeding opportunities. The mixture of migratory and resident tactics within a population can have significant ecological, genetic, and evolutionary consequences. Using data from the Sheep River Provincial Park in Alberta, Canada, researchers analyzed the presence/absence of 62 marked bighorn sheep males during six mating seasons. The study found that approximately half of the males left their natal population to breed elsewhere.
ECOLOGY AND EVOLUTION
(2022)
Article
Ecology
Rachel Bergeron, Gabriel Pigeon, David M. Forsyth, Wendy J. King, Marco Festa-Bianchet
Summary: Large herbivores have varying survival rates depending on their age and sex, with juveniles and senescent adults having lower and more variable survival rates compared to prime-aged adults. This study used long-term capture-mark-recapture data to examine the survival component of eastern grey kangaroo population dynamics. The results showed that kangaroo survival patterns are similar to those seen in ungulates, with sex-age structure playing a significant role in population dynamics.
Article
Evolutionary Biology
Roxane Lassis, Marco Festa-Bianchet, Joanie Van de Walle, Fanie Pelletier
Summary: In terrestrial and marine ecosystems, migrants from protected areas may mitigate the evolutionary consequences of selective harvest in exploited populations. Understanding the mechanisms favoring genetic rescue through migration is important for sustainable harvest and conservation of genetic diversity.
EVOLUTIONARY APPLICATIONS
(2023)