scholarly journals Red fox sex ratio and changes in the number in the Krasnoarmeisky District of the Samara Region

2018 ◽  
Vol 7 (2) ◽  
pp. 111-115
Author(s):  
Olga Aleksandrovna Sklueva ◽  
Valeriy Vitalyevich Sklyuev ◽  
Rafik Ibragimovich Khakimov
Keyword(s):  
Population Dynamics ◽  
Sex Ratio ◽  
Vulpes Vulpes ◽  
Red Fox ◽  
Direct Impact ◽  
Age Composition ◽  
Behavioral Adaptations ◽  
Epizootic Process ◽  
Males And Females ◽  
Homeostatic State

The paper presents some data on the red fox ( Vulpes vulpes , Linnaeus, 1758) sex ratio in the Krasnoarmeysky District of the Samara Region. The results of winter trails traces of mammals show the placement of individual sites of males and females. The authors consider relationship between the population dynamics, sex and age composition and the placement of individual sites. Some aspects of behavioral adaptations and causes of changes in the number of animals in the study area are considered. The influence of a poaching factor on the dynamic indicators of the studied population and the possible danger of the epizootic process is described. A comparative analysis with the previously obtained data on the ratio of males and females in the litter is carried out. The paper indicates possible causes of animals number changes in the study areas. Poaching has a direct impact on the studied population homeostatic state maintaining mechanisms. There is also a forecast of poaching influence on deterioration of epidemiological and epizootic situation in the investigated region. In this paper we give recommendations to minimize possible damage by human activities.

The relationship between hunting methods and sex, age and body weight in a non-trophy animal, the red fox

2009 ◽  
Vol 36 (2) ◽  
pp. 106 ◽  
Author(s):  
Piotr Tryjanowski ◽  
Tim H. Sparks ◽  
Robert Kamieniarz ◽  
Marek Panek
Keyword(s):  
Body Weight ◽  
Body Size ◽  
Sex Ratio ◽  
Vulpes Vulpes ◽  
Red Fox ◽  
Seasonal Differences ◽  
Evolutionary Changes ◽  
Potential Sources ◽  
The Relationship ◽  
Game Animals

Recently, hunting has represented a major source of mortality in game animals, including red fox, Vulpes vulpes, populations. Data from hunting studies have been used to explain evolutionary changes (body size, dental structure) in fox populations; however, knowledge of potential sources of bias in these kinds of data is lacking. Moreover, nature and game managers as well as conservationists have recently been seeking methods to limit European fox populations, which are increasing. In the present study in Polish farmland, we show that three different hunting methods (individual – lying in wait, with dogs at dens, with beating undergrowth to flush out foxes) resulted in differences in the age, sex ratio and body size of shot foxes. Taking account of seasonal differences in hunting methods used, shooting assisted by beating gave a higher proportion of male foxes, whereas individual hunting resulted in smaller foxes in shot samples. Hunting with dogs resulted in heavier female foxes, with the results being skewed towards females. Thus, this method may help limit the breeding capacity of a population and is recommended to assist in the control of red fox populations, at least in farmland areas.

scholarly journals Relative growth and population dynamics of Macrobrachium iheringi (Decapoda, Palaemonidae)

2019 ◽  
Vol 59 ◽  
pp. e20195908 ◽  
Author(s):  
Caio Dos Santos Nogueira ◽  
Júlia Fernandes Perroca ◽  
Emerson Luiz Piantkoski ◽  
Rogerio Caetano da Costa ◽  
Fabiano Gazzi Taddei ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Life Cycle ◽  
Sex Ratio ◽  
Larval Development ◽  
Sexual Maturity ◽  
Abiotic Factors ◽  
Relative Growth ◽  
Males And Females ◽  
Life Cycle Pattern ◽  
Precipitation And Temperature

During the ontogenetic development of crustaceans, the relative growth of some structures may change, especially during the transition from juvenile to adult. This study describes the relative growth of body structures of Macrobrachium iheringi, and provides information on its population dynamics, such as structure, fecundity, and morphological sexual maturity. The sampling of M. iheringi was carried out in “Ribeirão da Hortelã”, in Botucatu (SP, Brazil). The length of the carapace (CL), abdomen (AL), and ischium (IL), merus (ML), carpus (CrL), propodus (PpL), and dactyl (DcL) of the second right pereopod were measured. In addition, the width of the second abdominal pleura (PW) and propodus height (PpH) were included in analyses. The relationships that best demonstrated the changes in the allometric coefficient were CL vs PpL in males and females. The CL, in which males and females reach morphological sexual maturity, was estimated as 13.3 mm and 11.1 mm, respectively. The sex-ratio differed from the expected 1:1 and was skewed towards females. Precipitation and temperature influenced the abundance of different demographic classes. Macrobrachium iheringi has few but large eggs, which is expected since this species has an abbreviated larval development. Based on these results, we conclude that the propodus are good indicators of the size at onset of morphological sexual maturity. In addition, important information was obtained on the biology of M. iheringi, including its life cycle pattern, reproduction and influence of abiotic factors.

Skewed sex ratio in a forest salamander: artefact of the different capture probabilities between sexes or actual ecological trait?

2018 ◽  
Vol 39 (1) ◽  
pp. 79-86
Author(s):  
Antonio Romano ◽  
Marco Basile ◽  
Andrea Costa
Keyword(s):  
Population Dynamics ◽  
Sex Ratio ◽  
Demographic Parameter ◽  
Males And Females

Sex ratio is an essential demographic parameter and distortions from a balanced sex ratio may have contrasting effects on the population dynamics. However, observation of distorted sex ratio using counts or captures may reflect an actual ecological trait of the studied population but may also be an artefact due to different capture probabilities of males and females. We compared results obtained from Counts and Capture-Marking-Recapture (CMR) on both sexes in a population of a forest dwelling salamander,Salamandrina perspicillata, and we investigated if males and females had different capture probabilities. We surveyed available literature to compare information on sex ratio from other populations ofS. perspicillata. The sex ratio from our counts was 0.65 and was significantly male-biased as reported in other studies. The estimated sex ratio from CMR data was 0.57. Although males showed higher recapture rates than females in every capture session, these differences were not statistically significant. Therefore, the skewed sex ratio towards males is not only an artefact due to different capture probabilities between males and females but reflects an actual demographic trait, although the magnitude of the skeweness was overestimated by counts.

scholarly journals Sex Ratio, Body Mass, and Harvest Rates for Five Sympatric Mammalian Carnivores in the Canadian Prairies

2010 ◽  
Vol 124 (3) ◽  
pp. 204
Author(s):  
Serge Larivière ◽  
Vance Lester ◽  
Wanda Gorsuch
Keyword(s):  
Sex Ratio ◽  
Body Mass ◽  
Vulpes Vulpes ◽  
Red Fox ◽  
Red Foxes ◽  
Canadian Prairies ◽  
Striped Skunk ◽  
Taxidea Taxus ◽  
American Badger ◽  
Striped Skunks

We assessed sex ratio, body mass, and harvest rates for 5 species of carnivores (Mammalia: Carnivora) collected in southern Saskatchewan, Canada during spring and summer 1999-2001. Overall, 647 adult carnivores were collected; captures consisted mostly of Striped Skunk (Mephitis mephitis, 50.7% of captures, 2.6±0.6 kg), Raccoon (Procyon lotor; 28.3%, 6.5±1.3 kg), American Badger (Taxidea taxus, 8.2%, 7.7±1.5 kg), Red Fox (Vulpes vulpes, 7.7%, 4.6±0.6 kg), and Coyote (Canis latrans, 5.1%, 11.0±1.5 kg). Sex ratio (M:F) of captures was male-biased for Raccoon (2.5:1), Striped Skunk (1.7:1), but did not differ from 1:1 for American Badger (2.3:1), Coyote (1.7:1), or Red Fox (2.2:1). For both Striped Skunk and Raccoon, the temporal variation in sex ratio of captures suggests that males were more vulnerable to capture early in the spring than females. Harvest rates were highest for Striped Skunks (range 0.8-2.2 animals/km2) followed by Raccoons (0.4-1.3 animals/km2), American Badgers (0.2-0.5 animal/km2), Red Foxes (0.2-0.4 animal/km2), and Coyotes (0.1-0.4 animals/km2).

Primary osteoblast culture from red fox (Vulpes Vulpes)

2016 ◽  
Author(s):  
Ines Pedro Perpetuo ◽  
Alessandro Felder ◽  
Andrew Pitsillides ◽  
Michael Doube ◽  
Isabel Orriss
Keyword(s):  
Vulpes Vulpes ◽  
Red Fox ◽  
Primary Osteoblast ◽  
Osteoblast Culture

Diet of the introduced red fox Vulpes vulpes in Australia: analysis of temporal and spatial patterns

Mammal Review ◽  
2021 ◽  
Author(s):  
Patricia A. Fleming ◽  
Heather M. Crawford ◽  
Alyson M. Stobo‐Wilson ◽  
Stuart J. Dawson ◽  
Christopher R. Dickman ◽  
...  
Keyword(s):  
Spatial Patterns ◽  
Vulpes Vulpes ◽  
Red Fox ◽  
Temporal And Spatial Patterns ◽  
Temporal And Spatial

The Red Fox (Vulpes vulpes ) as an Accumulator of Bones in Cave-like Environments

2012 ◽  
Vol 24 (4) ◽  
pp. 459-475 ◽  
Author(s):  
Magdalena Krajcarz ◽  
Maciej Tomasz Krajcarz
Keyword(s):  
Vulpes Vulpes ◽  
Red Fox
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