Studie über wilde Füchse und Hundeartige (f 1976) * Étude sur le renard sauvage et les canidés (f 1976)
Because physical evidence would prove what I believe I sent this to the Hong Kong Biodiversity Museum:
Press release issued:
Researchers from the University of Bristol used thirty years of data regarding the movements of the urban red fox to construct and verify a mathematical model on which their analysis was based. A trade-off between two factors emerged as key determinants of territoriality – the time necessary for an animal to move between its own boundaries and the time span during which the fox could maintain its scent trail within that territory.
In 1994, when a disease called sarcoptic mange infected and killed most of Bristol's fox population, Professor Stephen Harris noticed that as the animals on one territory died, the neighbouring animals were able to move in and take over within a matter of three or four days. He assumed that this was because the scent marks of the original fox population were no longer fresh.
This new study, published in PLoS Computational Biology, shows how important it is for a fox to renew its scent marks frequently, further demonstrating the transient nature of populations, and disputing previously held beliefs that scent marks serve as a long-term message and indicator of territorial boundaries.
Lead author Dr Luca Giuggioli, a Complexity Sciences lecturer in the Department of Engineering Mathematics and the School of Biological Sciences, said: “Understanding how organisms move and interact has implications far beyond behavioural ecology. This model may, for instance, shed light on the processes responsible for the formation of territorial boundaries in early human hunter-gatherer societies, and eventually help predict how the size of modern day countries will evolve.”
Co-author Jonathan Potts added: “Our theoretical framework might also inspire designs in collective robotics. From very simple rules, the individuals divide space into territories, and if one individual should fail, its territory is taken over. Building an army of territorial robots that move according to these rules could be an efficient and robust way to deal with dangerous tasks over a wide spatial area, such as clearing minefields.”
Dr Giuggioli added: “This study is one classic example in which answering a biological question with the help of Complexity Sciences tools provides far reaching results, challenging long-held preconceptions and opening up the possibilities in areas of science unrelated to where the questions originated.”
Paper: Animal interactions and the emergence of animal territoriality, by Luca Giuggioli, Jonathan Potts, Stephen Harris. Published in PLoS Computation Biology.
Abstract from Acute lethal leptospirosis in a red fox (Vulpes vulpes) Journal of Comparative Pathology Volume 201, February 2023, Pages 77-80
Leptospirosis, caused by pathogenic spirochaetes belonging to the genus Leptospira, is a globally distributed zoonosis that can affect many species of domestic and wild animals, and humans. The red fox (Vulpes vulpes) is a native species in Croatia and, due to constant food availability and lack of interspecies competition, is becoming more abundant in urban and suburban areas.
Although antibodies for Leptospira spp have been detected in red foxes, lethal disease has not been reported. We necropsied a young, male red fox that had jaundice, multifocal haemorrhages in the heart, lungs and urinary bladder, hepatomegaly, non congestive splenomegaly and slight yellow discolouration of the renal cortex and medulla. Histology revealed multifocal haemorrhages in parenchymal organs, thrombi within lung septal capillaries and other blood vessels, interstitial lymphocytic and plasmacytic nephritis and erosions of the gastric mucosa.
A microscopic agglutination test on the post-mortem cardiac blood clot revealed a high titre to Leptospira interrogans serovar Icterohaemorrhagiae, which implies contact with rats, which are natural reservoirs of this serovar in Croatia.
The gross and histological findings in this fox were similar to those in dogs with leptospirosis, indicating that fatal leptospirosis can occur in foxes and suggesting that this species can act as a source of infection for other animals and humans.
Ljungan Virus is quite "a thing" at the moment with a lot of research being carried out -not for wildlife health but human -that attracts the money.
With our necropsy study we found that babesia and leptospirosis were heavy hitters amongst foxes so it only makes sense that as foxes main prey are rodents such as rats, voles, etc I at least mention the topic (it has been noted in Red Foxes but sadly the UK is far from open when it comes to research papers -unlike the US or Europe.
From Wikipedia: https://en.wikipedia.org/wiki/Ljungan_virus
Ljungan virus was first discovered in the mid-1990s after being isolated from a bank vole near the Ljungan river in Medelpad county, Sweden.[2] It has since been established that Ljungan virus, which is also found in several places in Europe and America, causes serious illness in wild as well as laboratory animals.[3][4][5][6] Several scientific articles have recently reported findings indicating that Ljungan virus is associated with malformations, intrauterine fetal death, and sudden infant death syndrome in humans.[7][8][9][10] In addition, studies are being conducted worldwide to investigate the possible connection of the virus to diabetes, neurological and other illnesses in humans.[11][12]
Ljungan virus belongs to the genus Parechovirus of the family Picornaviridae. Other members of this viral family include poliovirus, Hepatitis A virus, and the viruses that cause the common cold (rhinovirus).[13] One of the earliest scientific discoveries regarding Ljungan virus was that infected wild rodents developed diabetes if they were exposed to stress.[14] This has led to speculation that this disease may be the underlying cause of fluctuating rodent populations in Scandinavia; when rodents increase to high densities, they find it difficult to defend territory and obtain food, and then become more susceptible to predation. This stressful situation results in disease, death and population decline, leading to a pattern of cyclic variation in population size over time.[4]
There was a 2014 paper (see abstract below)
"Ljungan virus is a recently identified member of the family Picornaviridae that was isolated from bank voles in Sweden. LjV has been associated with [corrected] type 1 diabetes-like symptoms and myocarditis in bank voles (Myodes glareolus), and it has been suggested that it has zoonotic potential.
"Here, we show for the first time that Ljungan virus is prevalent (20-27 % positive by PCR) in four species of UK rodent (Myodes glareolus [bank vole], Apodemus sylvaticus [wood mouse], Microtus agrestis [field vole] and Mus musculus [house mouse]).
"Sequence analysis showed that Ljungan virus of genotypes 1 and 2 were present, although genotype 1 was more prevalent and more frequently associated with brain tissue.
"This study highlights the prevalence of Ljungan virus in the UK and the need for assessment [corrected] of its zoonotic potential."
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In the paper Staphylococcus pseudintermedius infection Pyometra bij een vos (Vulpes vulpes) veroorzaakt door een infectie met Staphylococcus pseudintermedius; Dierengezondheidszorg Vlaan in Red Foxesderen (DGZ), Industrielaan 29, B-8820 Torhout Stefan.Roels@sciensano.be, submitted by N. Caliskan, A. Vandekerckhove, E. Rolly, E. Forrez, S. Roels, it is noted that:
"An adult female fox found dead in a field in Flanders (Belgium) was brought in for autopsy. The uterus was remarkably enlarged with dilation of the right horn tip and dilations of the myometrium of the left horn. The lumen of the uterus was filled with greenish-yellow pasty contents. Bacteriological examination of these contents resulted in a pure culture of Staphylococcus pseudintermedius.
"The diagnosis of pyometra caused by S. pseudintermedius was made. Pyometra in wild canids has rarely been described. It is assumed that the cause of death is similar to that in dogs, namely septic shock. According to the authors, this is the first described case of closed pyometra with isolation of S. pseudointermedius in an adult fox".
Before it was officially suppressed, the Bristol Fox Deaths Project founas d a number of never before noted health issues with foxes. Pyometra was not one of them although I suspected a case in the Midlands in 2021 may have been. Others we can only look back on and wonder whether they were pyometra cases. No study similar to that in Bristol had ever been undertaken in the UK -a dead fox was a dead fox and held no interest for vets as it was after all a wild animal with no one footing the bill for a necropsy.
Looking back at my notes it is possible that there were other cases but not sub mitted for necropsy as no one was available to collect.
It now appears, if the vet is correct, that we have such a case from Bristol. Fox health and welfare is still in early stages but there is hope!
Because physical evidence would prove what I believe I sent this to the Hong Kong Biodiversity Museum: Hello. My name is Terry Hooper and ...
