Bulwer's wattled pheasant (Lophura bulweri) have traditionally been housed in pairs in captivity, although it is unknown whether monogamy is the species' natural mating system. In 1998 we placed our group of 3.3 L. bulweri together in a complex outdoor habitat, in order to investigate several questions. These included whether monogamous pairing was the natural mating system for the species, how the new grouping would affect their behavior, and what microhabitats the individuals preferred within the complex habitat. Initially, all six individuals remained in the same enclosure without conflict. After a period of approximately 6 weeks, 2.1 of these individuals were removed for their safety, due to increasingly aggressive interactions. The data we collected indicate that the species may have an exploded lek type of mating system in the wild and that individuals may flock together in the nonbreeding season. In addition, males and females seem to prefer different types of shade regimes. These results suggest ways to improve husbandry and breeding success of the species in captivity. Zoo Biol 20:15-25, 2001. Copyright 2001 Wiley-Liss, Inc.
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Evolution
January 2025
Department of Biological Sciences, Duquesne University, Pittsburgh, PA, 15282, United States.
Male reproductive proteins frequently evolve rapidly in animals, potentially due to adaptive evolution driven by sperm competition, polyspermy avoidance, or pathogen defense. Alternatively, elevated rates of protein change may be due to relaxed constraint. The prostate-specific protease KLK3 has experienced dynamic evolution since its origin stemming from a gene duplication in the ancestor of all Old World primates, with instances of rapid evolution, stasis, and pseudogenization.
View Article and Find Full Text PDFCurr Res Parasitol Vector Borne Dis
January 2025
Western University of Health Sciences, 200 Mullins Dr, Lebanon, OR, 97355, USA.
snails are intermediate hosts for schistosome parasites, which cause morbidity and mortality in humans worldwide. We aimed to determine the mating system of , a hermaphroditic vector of schistosomiasis in the African Great Lakes, with the goal of informing the design of genetic studies such as linkage mapping to improve genome assembly and genetic association studies to identify snail resistance genes. To determine the relative rates of outcrossing selfing, we assayed the progeny of experimental crosses of snails in the laboratory using a PCR and restriction enzyme digest to determine snail genotype and parentage.
View Article and Find Full Text PDFAnnu Rev Entomol
January 2025
Laboratory of Genetics, Wageningen University & Research, Wageningen, The Netherlands.
Major changes in genetic variation are generally considered deleterious to populations. The massive biodiversity of insects distinguishes them from other animal groups. Insect deviant effective population sizes, alternative modes of reproduction, advantageous inbreeding, endosymbionts, and other factors translate to highly specific inbreeding and outbreeding outcomes.
View Article and Find Full Text PDFEvolution
January 2025
Department of Biology, Texas A&M University, College Station TX.
Evolutionary changes in development and/or host number of parasite life cycles can have subsequent ecological and evolutionary consequences for parasites. One theoretical model based on the mating systems of hermaphroditic parasites assumes a life cycle with fewer hosts will result in more inbreeding, and predicts a truncated life cycle most likely evolves in the absence of inbreeding depression. Many populations of the hermaphroditic trematode Alloglossidium progeneticum maintain an ancestral obligate 3-host life cycle where obligate sexual reproduction occurs among adults in catfish third hosts.
View Article and Find Full Text PDFActa Bioeng Biomech
September 2024
Department of Mechanics, Materials and Biomedical Engineering, Faculty of Mechanical Engineering, Wrocław University of Science and Technology, Wrocław, Poland.
: The aim of this study was to evaluate the abrasive wear of the sliding screw-rod joint used in growth guidance system (GGS) stabilizers, allowing for the translation of the screw along the rod during the spinal growth process in a standard and modified system. : The study used single kinematic screw-rod pairs made of titanium alloy Ti6Al4V. Mechanical tests (cyclic loads) simulated the stabilizer's operation under conditions similar to actual use.
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