Some biological and behavioral aspects of Amblyomma longirostre (Acari: Ixodidae) under laboratory and natural conditions

2018 ◽  
Vol 23 (10) ◽  
pp. 1965 ◽  
Author(s):  
Hermes Ribeiro Luz ◽  
Thiago F. Martins ◽  
Rodrigo H. F. Teixeira ◽  
Flávio A. Terassini ◽  
Herbert S. Soares ◽  
...  
Keyword(s):  
Life Cycle ◽  
Host Species ◽  
Field Data ◽  
External Surface ◽  
Gallus Gallus ◽  
Wild Animals ◽  
Natural Conditions ◽  
Recovery Rates ◽  
Adult Females ◽  
Calomys Callosus

Amblyomma longirostre (Koch, 1844) has been reported as one of the most common ticks parasitizing wild animals in Brazil; however, information about its life cycle is inexistent, as well as information on its behavior in nature. In order to determine some aspects of the life cycle of A. longirostre in the laboratory, we performed infestations of larvae and nymphs on Serinus canaria (Common Canary - Passeriformes), Calomys callosus (Vesper mouse), Sphiggurus villosus (Brazilian porcupine), and Gallus gallus (chicks - no Passeriformes); this later host species only for larvae. While the overall recovery rates of engorged larvae and nymphs were low (at most 11.1%), the highest rates were for ticks that had fed on S. canaria (Passerifomes). This result is supported by field data, which indicate Passeriformes as preferable hosts for larvae and nymphs of A. longirostre. Interestingly, the suitability of the porcupine S. villosus as host for larvae and nymphs was statistically similar to S. canaria, although the recovery rates on the later host species were slightly higher. The Cricetidae mouse C. callosus displayed the lowest recovery rates (0–0.5%) of engorged ticks, indicating that mice might not be suitable hosts for A. longirostre under natural conditions. We also report three  adult females of A. longirostre that were collected from two Bristle-spined porcupine Chaetomys subspinosus. Curiously, each of the three ticks was attached to the median third of a spine of the porcupines. The hypostome was surrounded by a cement-like structure at the spine external surface, but did not break through the external surface of the spine. Biological explanations for this behavior are discussed. 

scholarly journals Domestication of wild animals may provide a springboard for rapid variation of coronavirus

2021 ◽  
Vol 16 (1) ◽  
pp. 252-254
Author(s):  
Lei Gao
Keyword(s):  
Intermediate Host ◽  
Wild Animals ◽  
Intermediate Hosts ◽  
Natural Conditions ◽  
Rapid Variation ◽  
Cross Breeding ◽  
Important Direction ◽  
Animal Hosts

Abstract Coronaviruses have spread widely among humans and other animals, but not all coronaviruses carried by specific animals can directly infect other kinds of animals. Viruses from most animal hosts need an intermediate host before they can spread widely among humans. Under natural conditions, coronaviruses do not rapidly change from infecting wild animals as intermediate hosts and to spreading widely among humans. The intermediate host might be the animals captured or bred for the purpose of cross-breeding with domesticated species for improvement of the breed. These animals differ from wild animals at the environmental and genetic levels. It is an important direction to study the semi-wild animals domesticated by humans in search for intermediate hosts of viruses widely spread among humans.

scholarly journals Evolutionary dynamics of spore killers.

Genetics ◽  
1993 ◽  
Vol 135 (3) ◽  
pp. 923-930 ◽  
Author(s):  
M J Nauta ◽  
R F Hoekstra
Keyword(s):  
Life Cycle ◽  
Segregation Distortion ◽  
Population Genetic ◽  
Field Data ◽  
Evolutionary Dynamics ◽  
Natural Populations ◽  
Additional Advantage ◽  
Genetic Modeling ◽  
Spore Killing ◽  
Ascospore Formation

Abstract Spore killing in ascomycetes is a special form of segregation distortion. When a strain with the Killer genotype is crossed to a Sensitive type, spore killing is expressed by asci with only half the number of ascospores as usual, all surviving ascospores being of the Killer type. Using population genetic modeling, this paper explores conditions for invasion of Spore killers and for polymorphism of Killers, Sensitives and Resistants (which neither kill, nor get killed), as found in natural populations. The models show that a population with only Killers and Sensitives can never be stable. The invasion of Killers and stable polymorphism only occur if Killers have some additional advantage during the process of spore killing. This may be due to the effects of local sib competition or some kind of "heterozygous" advantage in the stage of ascospore formation or in the short diploid stage of the life cycle. This form of segregation distortion appears to be essentially different from other, well-investigated forms, and more field data are needed for a better understanding of spore killing.

scholarly journals Host density predicts the probability of parasitism by avian brood parasites

2019 ◽  
Vol 374 (1769) ◽  
pp. 20180204 ◽  
Author(s):  
Iliana Medina ◽  
Naomi E. Langmore
Keyword(s):  
Spatial Distribution ◽  
Reproductive Success ◽  
Host Species ◽  
Field Data ◽  
Host Density ◽  
Brood Parasites ◽  
Parasitism Rates ◽  
Analyse Data ◽  
First Time ◽  
Determining Factor

The spatial distribution of hosts can be a determining factor in the reproductive success of parasites. Highly aggregated hosts may offer more opportunities for reproduction but can have better defences than isolated hosts. Here we connect macro- and micro-evolutionary processes to understand the link between host density and parasitism, using avian brood parasites as a model system. We analyse data across more than 200 host species using phylogenetic comparative analyses and quantify parasitism rate and host reproductive success in relation to spatial distribution using field data collected on one host species over 6 years. Our comparative analysis reveals that hosts occurring at intermediate densities are more likely to be parasitized than colonial or widely dispersed hosts. Correspondingly, our intraspecific field data show that individuals living at moderate densities experience higher parasitism rates than individuals at either low or high densities. Moreover, we show for the first time that the effect of host density on host reproductive success varies according to the intensity of parasitism; hosts have greater reproductive success when living at high densities if parasitism rates are high, but fare better at low densities when parasitism rates are low. We provide the first evidence of the trade-off between host density and parasitism at both macro- and micro-evolutionary scales in brood parasites. This article is part of the theme issue ‘The coevolutionary biology of brood parasitism: from mechanism to pattern’.

scholarly journals Ecological characteristics of Varroa destructor (parasitiformes, varroidea) and its environmental capacity as a key factor for development of varroosis panzootia

2012 ◽  
Vol 46 (5) ◽  
pp. 8-14
Author(s):  
I. A. Akimov ◽  
O. P. Korzh
Keyword(s):  
Life Cycle ◽  
Honey Bee ◽  
Host Species ◽  
Varroa Destructor ◽  
Varroa Mite ◽  
Environmental Capacity ◽  
Ecological Characteristics ◽  
High Pathogenicity ◽  
Key Factor

Ecological Characteristics of Varroa destructor (Parasitiformes, Varroidae) and Its Environmental Capacity as a Key Factor for Development of Varroosis Panzootia. Akimov I. A., Korzh O. P. - By means of formalized schematic models of relationship with hosts the varroa mite uniqueness as a parasite is shown. The life cycle of this species requires the change of a host species at different stages of their development and physiological states. Thus the mite parasitizes not only a separate bee but a whole hive. The fact that the whole hive but not a single bee dies during varroosis development supports this idea. The impetus for this type of parasitism is the relative constancy of the environment in the hive supported by bees even in winter. Exactly this fact causes high pathogenicity of the varroa for the honey bee and its control complexity.

scholarly journals Endoparasites of wild animals from three biomes in the State of Mato Grosso, Brazil

2016 ◽  
Vol 68 (3) ◽  
pp. 571-578 ◽  
Author(s):  
D.G.S. Ramos ◽  
A.R.G.L.O. Santos ◽  
L.C. Freitas ◽  
S.H.R. Correa ◽  
G.V. Kempe ◽  
...  
Keyword(s):  
Host Species ◽  
Abiotic Factors ◽  
Wild Animals ◽  
New Host ◽  
Biotic Factor ◽  
Mato Grosso ◽  
Biotic And Abiotic Factors ◽  
Parasitological Examination ◽  
Biotic Potential ◽  
Veterinary Hospital

ABSTRACT The population of wild animals is regulated by many biotic and abiotic factors, and parasites are a biotic factor that affects the dynamic and density of host populations. From 2002 to 2014, 62 wild animals from the biomes Pantanal, Amazon, and "Cerrado" (or Savanna), which died in attendance in the veterinary hospital or have been road-killed, underwent necropsy for parasitological examination. Overall, 36 species of parasites were identified from 24 host species. Among the parasites, the most prevalent order was Oxyurida (29.1%), followed by Strongylida (20.9%), Spirurida (19.4%), Ascaridida (16.2%), Pentastomida (3.2%), Echinostomida (3.2%), Gygantorhynchia (3.2%), Rhabditida (1.6%), Plagiorchiida (1.6%), and Monilimorfida (1.6%), especially nematodes, which have more biotic potential and is more easily adapted to the environment than other classes. The occurrence of endoparasites was observed more frequently in endothermic than ectothermic animals, and herein is reported eleven new host occurrences for endoparasites in wild animals. The study has contributed to the knowledge on the biodiversity of parasites in wild animals from three biomes in central-western Brazil.

scholarly journals Environmental Conditions as a Factor of Influence on the Everyday Life of the Orthodox Population of Ukrainian Lands of the Second Half of the 16th-17th Centuries

2020 ◽  
pp. 9-17
Author(s):  
Inna Goncharenko ◽  
Keyword(s):  
Everyday Life ◽  
Mutual Influence ◽  
Human Life ◽  
Main Task ◽  
Wild Animals ◽  
Natural Conditions ◽  
Natural Factor ◽  
Production Practices ◽  
The Impact ◽  
Factor Of Influence

The purpose of this article is to analyze natural conditions as a significant factor of influence on everyday life, practices and strategies for the survival of the population of Ukrainian lands in the second half of the 16th – 17th centuries. The main task of the study is to reconstruct the environment of the second half of the 16th – 17th centuries and to identify the mutual influence of man and nature. Research methodology: the following methods were used: general scientific – historical and logical, analysis and synthesis, generalization; special – historical-systemic, historical reconstruction, which consists in drawing up a fairly complete picture of everyday life from disparate facts. Scientific novelty: the natural factor in the pre-industrial era is significantly underestimated in the studies of everyday life and is one of the most significant in the impact on human life, but it is ignored in modern historical works. Therefore, the analysis of the natural conditions of everyday life, especially in the early modern era, is relevant today. Conclusions. The analysis of the influence of natural conditions on everyday life of the population shows that a significant part of the population in one way or another was engaged in the transformation of nature in their production practices and was largely dependent on the environment. In the minds of the population, nature was seen as an endless resource for consumption. When assessing the influence of nature on everyday life in the second half of the 16th – 17th centuries, emphasis should be placed on the fact that during this period there was a combination of reproduction and appropriating forms of the economy in everyday production practices. The richness of natural resources, the fertility of the soil helped people to survive, but everyday survival was often due to the merciless exploitation of nature, especially in forests and wild animals. Parallel to this, there are attempts to protect resources from overuse by granting privileges to a limited number of consumers and legislative regulation. In general, the environmental circumstances of everyday life of the specified period cannot be characterized as stable due to the reduction of forest, plowing of virgin lands, excessive extermination of wild animals.

scholarly journals Road kills of vertebrate fauna in Dir Lower, Khyber Pakhtunkhwa, Pakistan

2019 ◽  
pp. 152-154
Author(s):  
Sohail Anjum ◽  
Hazrat Ali ◽  
Awais Ahmad ◽  
Farzana Bibi
Keyword(s):  
Gallus Gallus ◽  
Felis Catus ◽  
Wild Animals ◽  
Domestic Cats ◽  
Survey Period ◽  
Khyber Pakhtunkhwa ◽  
Vertebrate Fauna ◽  
The Road ◽  
Capra Aegagrus

Research on road kills of wild animals in the district of Dir Lower, Khyber Pakhtunkhwa, Pakistan has not been previously reported. This study was conducted to estimate the incidence of vertebrate fauna road-kills on a heavily used 22 km long stretch of the road within the study area. A total of 65 road kills of vertebrate animals were reported during a 7-month-long survey period. Overall, road kills of nine species were reported with the highest percentage being domestic cats (Felis catus) and the lowest percentage being goats (Capra aegagrus hircus) and fowl (Gallus gallus).

scholarly journals Reproductive diapause in Nysius huttoni White (Heteroptera Lygaeidae)

2002 ◽  
Vol 55 ◽  
pp. 308-311
Author(s):  
X.Z. He ◽  
Q. Wang ◽  
A. Carpenter
Keyword(s):  
Life Cycle ◽  
Immature Stages ◽  
Life Stages ◽  
Reproductive Diapause ◽  
Entire Life ◽  
Entire Life Cycle ◽  
Adult Females ◽  
Critical Photoperiod

The induction of reproductive diapause of Nysius huttoni was studied in the laboratory at 20 1C and 60 10 RH under a series of photoperiod regimes 168 h 1410 h 1212 h and 1014 h lightdark Reproductive diapause was considered to have occurred if females failed to lay eggs for 50 days after emergence The sensitivity of different life stages to diapauseinducing photoperiods varied When newly emerged females whose immature stages had been reared at 168 h were transferred to 1014 h and 1212 h 467 and 793 of them entered reproductive diapause respectively However when fifth instar nymphs were transferred from 168 h to 1014 h and 1212 h 100 of adult females entered reproductive diapause If the entire life cycle was maintained at 1014 h and 1212 h 667 and 400 of females entered reproductive diapause respectively The critical photoperiod for reproductive diapause was estimated to lie between 1311 h and 135105 h

A taxonomic review of the Margarodoid genus Stigmacoccus Hempel  (Hemiptera: Sternorrhyncha: Coccoidea: Stigmacoccidae), with some details on their biology

Zootaxa ◽  
2007 ◽  
Vol 1507 (1) ◽  
pp. 1-55 ◽  
Author(s):  
CHRIS HODGSON ◽  
HEATHER GAMPER ◽  
AMAURI BOGO ◽  
GILLIAN WATSON
Keyword(s):  
Life Cycle ◽  
Scale Insect ◽  
Present Knowledge ◽  
Passerine Birds ◽  
Adult Males ◽  
Undescribed Species ◽  
Annual Life Cycle ◽  
Honey Production ◽  
Adult Females ◽  
The Family

Stigmacoccus is an unusual scale insect genus from Central and South America that has been little studied. It belongs to the family Stigmacoccidae within the archaeococcoid group of genera which used to comprise the family Margarodidae (Morrison, 1927) but which are now considered to represent at least 9 families. The present paper describes or redescribes the adult females, adult males, cyst stages and crawlers of the three known species (S. asper, S. garmilleri, and S. paranaensis), plus the prepupa of S. garmilleri and S. paranaensis, and (briefly), the pupa of S. paranaensis. It is considered that the female has two cyst stage instars; the number in the male is uncertain. Adult female S. asper and S. paranaensis appear to have groups of loculate pores on the walls of the vagina. A lectotype for S. asper is designated. In addition, cyst stages of three further undescribed species are described (but not formally named) and illustrated. Some observations on the biology and life cycle are also included. The honeydew of Stigmacoccus species has been shown to be an important energy source for overwintering passerine birds which defend this resource. A summary of our present knowledge is presented, including how the honedew is eliminated (through a long anal tube) and details are given with regard to rates of honeydew flow, sugar concentration, cyst densities and annual timing of peak flows. The annual life cycle, as far as it is known, is discussed. It is concluded that this honeydew could be economically important as a source of sugar for honey production but this would need to be carefully managed to maintain an ecological balance.

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