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Tracking individual seed fate confirms mainly antagonistic interactions between rodents and European beech.
Biol Lett
January 2025
Department of Ecosystem Management, Climate, and Biodiversity, Institute of Wildlife Biology and Game Management, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria.
Food-hoarding granivores act as both predators and dispersers of plant seeds, resulting in facultative species interactions along a mutualism-antagonism continuum. The position along this continuum is determined by the positive and negative interactions that vary with the ratio between seed availability and animal abundance, particularly for mast-seeding species with interannual variation and spatial synchrony of seed production. Empirical data on the entire fate of seeds up to germination and the influence of rodents on seed survival is rare, resulting in a lack of consensus on their position along the mutualism-antagonism continuum.
View Article and Find Full Text PDFWinter survival of a small predator is determined by the amount of food in hoards.
J Anim Ecol
January 2025
Section of Ecology, Department of Biology, University of Turku, Turku, Finland.
The hoarding behaviour of animals has evolved to reduce starvation risk when food resources are scarce, but effects of food limitation on survival of hoarding animals is poorly understood. Eurasian pygmy owls (Glaucidium passerinum) hoard small mammals and birds in natural cavities and nest boxes in late autumn for later use in the following winter. We studied the relative influence of the food biomass in hoards of pygmy owls on their over-winter and over-summer apparent survival.
View Article and Find Full Text PDFAdolescent social stress alters the role of orexin innervation in the hindbrain in male hamsters.
J Neuroendocrinol
January 2025
Psychology Department, The University of Texas at Austin, Austin, Texas, USA.
Article Synopsis
- - Juvenile male hamsters exposed to chronic social stress showed increased appetite, weight gain, and larger fat pads, indicating heightened obesity risk.
- - The study aimed to investigate changes in food hoarding behaviors and orexin/hypocretin signaling in these hamsters under social stress conditions.
- - Results confirmed previous findings on overeating and obesity, showing some correlation patterns between orexin innervation and appetite/metabolism, suggesting specific brain changes related to chronic social stress.
Proteomic evidence for seed odor modifying olfaction and spatial memory in a scatter-hoarding animal.
Behav Brain Res
February 2025
School of Life Sciences, Qufu Normal University, Qufu 273165, China. Electronic address:
Article Synopsis
- Seed odor significantly influences how small rodents, like Leopoldamys edwardsi, remember and retrieve cached food.
- The study tested how different intensities of seed odor affect the rodent's olfactory bulbs and hippocampus, key areas for memory and smell.
- Results show that weaker seed odors enhance the animal's olfactory abilities and memory due to changes in protein connections between these brain regions, offering insights into the evolution of smell and memory systems.
The Individual Division of Food Hoarding in Autumn Brandt's Voles ().
Animals (Basel)
September 2024
College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, 29 Erdos East Street, Saihan District, Hohhot 010011, China.
Article Synopsis
- - Brandt's voles, a common rodent in Inner Mongolia, hoard food in underground warehouses during autumn in preparation for winter, but it's unclear if they show a division of labor in this behavior.
- - An experiment with three different treatments (varied food supply and competition) revealed that voles displayed two hoarding behaviors: high food hoarding and low food hoarding, with feeding behavior dominating their actions across all treatments.
- - Despite the differences in hoarding amounts, there were no significant distinctions in body weight, sex, or inquiry abilities between high and low hoarders; however, high hoarders exhibited better spatial memory.
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