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In eusocial insects, offspring survival strongly depends on the quality and quantity of non-breeders. In contrast, the influence of social factors on offspring survival is more variable in cooperatively breeding mammals since maternal traits also play an important role. This difference between cooperative insects and mammals is generally attributed to the difference in the level of sociality. Examining offspring survival in eusocial mammals should, therefore, clarify to what extent social organization and taxonomic differences determine the relative contribution of non-breeders and maternal effects to offspring survival. Here, we present the first in-depth and long-term study on the influence of individual, maternal, social and environmental characteristics on early offspring survival in a eusocial breeding mammal, the naked mole-rat (). Similarly to other mammals, pup birth mass and maternal characteristics such as body mass and the number of mammae significantly affected early pup survival. In this eusocial species, the number of non-breeders had a significant influence on early pup survival, but this influence was negative-potentially an artifact of captivity. By contrasting our findings with known determinants of survival in eusocial insects we contribute to a better understanding of the origin and maintenance of eusociality in mammals.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9951735 | PMC |
http://dx.doi.org/10.3390/ani13040630 | DOI Listing |
Bull Environ Contam Toxicol
December 2024
Jiangsu Key Laboratory for Bioaffiliationersity and Biotechnology, School of Biological Sciences, Nanjing Normal University, Nanjing, 210023, China.
Atrazine is a predominant herbicide globally, and its residues are commonly found in natural water bodies due to its extensive use. Atrazine is known for its detrimental effects on the reproductive abilities of aquatic plants and animals. Our study explored the impact of maternal exposure to atrazine on the survival and performance of offspring using the water flea Daphnia magna as a model organism.
View Article and Find Full Text PDFReprod Toxicol
December 2024
Labcorp, Münster, Germany.
Rozanolixizumab, a humanised immunoglobulin (Ig) G4 monoclonal antibody that selectively inhibits binding of IgG to the neonatal Fc receptor (FcRn), was evaluated in an embryo-foetal enhanced pre- and postnatal development (ePPND) study. Pregnant female cynomolgus monkeys (19 per group) received subcutaneous rozanolixizumab 50mg/kg or 150mg/kg or vehicle every 3 days from gestation day 20 until delivery. The proportion of pregnancy losses was 15.
View Article and Find Full Text PDFJ Anim Sci
December 2024
Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS USA.
A total of 3,307 (PIC L 42) sows and 55,160 piglets were used to determine the effects of different farrowing systems on piglet livability and lifetime growth performance. Treatments were assigned to farrowing rooms and consisted of a conventional farrowing system (sows and piglets housed in individual farrowing stalls) or a pre-weaning socialization system (stall dividers removed between farrowing stalls and walkways within 6 to 24 h post-farrowing such that 12 to 32 litters of piglets were co-mingled). A total of 40 farrowing rooms with 80 stalls each were used with 20 rooms per treatment.
View Article and Find Full Text PDFAnn Bot
December 2024
Department of Biology, Queen's University, Kingston, Ontario, K7L3N6, Canada.
Background And Aims: Seed dispersal impacts plant fitness by shaping the habitat and distribution of offspring, influencing population dynamics and spatial genetic diversity. Whether the evolution of dispersal strategies varies across herbaceous life forms (annual, perennial, clonal) is inconclusive. This study examines how seed dispersal strategies vary between annual and perennial populations of Mimulus guttatus (syn.
View Article and Find Full Text PDFEvol Hum Sci
November 2024
Department of Evolutionary Anthropology, University of Zurich, Zurich, Switzerland.
Hunter-gatherer populations underwent a mass extinction in the Neolithic, and in present times face challenges such as explicit sedentarisation policies. An exception is in Nepal, where the nomadic Raute people receive monthly governmental individual payments. One consequence of the money transfers has been a significant increase in alcohol consumption, with nearly all individuals drinking industrially produced alcohol.
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