Ecological studies on a dragonfly,Nannophya pygmaea ramber (Odonata: Libellulidae) I. seasonal changes of adult population and its distribution in a habitat

1978 ◽  
Vol 19 (2) ◽  
pp. 209-221 ◽  
Author(s):  
Kazuyuki Fujita ◽  
Koji Hirano ◽  
Michiharu Kawanishi ◽  
Naota Ohsaki ◽  
Makoto Ohtaishi ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Adult Population ◽  
Ecological Studies ◽  
Nannophya Pygmaea

scholarly journals SARS-CoV-2 seroprevalence in a high-altitude setting in Peru: adult population-based cross-sectional study

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12149
Author(s):  
Charles Huamaní ◽  
Lucio Velásquez ◽  
Sonia Montes ◽  
Ana Mayanga-Herrera ◽  
Antonio Bernabé-Ortiz
Keyword(s):  
High Altitude ◽  
Adult Population ◽  
Population Based ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Ecological Studies ◽  
Cross Sectional ◽  
Factors Associated ◽  
San Sebastian ◽  
Population Based Survey

Background There are several ecological studies, but few studies of the prevalence of SARS-COV-2 at high altitude. We aimed to estimate the population-based seroprevalence of SARS-COV-2 in three settings of Cusco at the end of the first wave among adults. Methods A population-based survey was conducted in September 2020, in three settings in the region of Cusco: (1) Cusco city at 3,300 meters above the sea level (m.a.s.l.), (2) the periphery of Cusco (Santiago, San Jerónimo, San Sebastián, and Wanchaq) at 3,300 m.a.s.l., and (3) Quillabamba city, located at 1,050 m.a.s.l. People aged ≥ 18 years within a family unit were included. The diagnosis of SARS-CoV-2 infection was based on identifying anti- SARS-CoV-2 total antibodies (IgM and IgG) in serum using the Elecsys Anti-SARS-CoV-2 chemiluminescence test. Results We enrolled 1924 participants from 712 families. Of the total, 637 participants were anti-SARS-CoV-2 seropositive. Seroprevalence was 38.8% (95% CI [33.4%–44.9%]) in Cusco city, 34.9% (95% CI [30.4%–40.1%]) in the periphery of Cusco, and 20.3% (95% CI [16.2%–25.6%]) in Quillabamba. In 141 families (19.8%; 95% CI [17.0%–22.8%]) the whole members were positive to the test. Living with more than three persons in the same house, a positive COVID-19 case at home, and a member who died in the last five months were factors associated with SARS-COV-2 seropositivity. Dysgeusia/dysosmia was the symptom most associated with seropositivity (aPR = 2.74, 95% CI [2.41–3.12]); whereas always wearing a face shield (aPR = 0. 73; 95% CI [0.60–0.89]) or a facial mask (aPR = 0.76, 95% CI [0.63–0. 92) reduced that probability. Conclusions A great proportion of Cusco’s city inhabitants presented anti-SARS-CoV-2 antibodies at the end of the first wave, with significant differences between settings. Wearing masks and face shields were associated with lower rate of seropositivity; however, efforts must be made to sustain them over time since there is still a high proportion of susceptible people.

Seasonal cycle of the nest composition in the Ponerine ant Cryptopone sauteri (Hymenoptera: Formicidae)

Sociobiology ◽  
2017 ◽  
Vol 64 (4) ◽  
pp. 393
Author(s):  
Yuki Yamaguchi ◽  
Hiromi Yazawa ◽  
Satoru Iwanishi ◽  
Kazuyuki Kudô
Keyword(s):  
Life History ◽  
Seasonal Changes ◽  
Seasonal Cycle ◽  
Quantitative Information ◽  
Social Structures ◽  
Ecological Studies ◽  
Brood Development ◽  
Ponerine Ant ◽  
History Of ◽  
Annual Life History

The annual life history is a basic and important factor in ecological studies on temperate ant species. The biology of Ponerinae species has been studied for many species, but little attention has been paid to their life history. Cryptopone sauteri is one of the most common ants in temperate regions of Japan. However, there is no quantitative information on the life history of this species. We report seasonal changes in brood development, the emergence of reproductives and social structures of C. sauteri. Additionally, we discuss that this species possibly exhibits a polydomous nesting system.

OBSERVATIONS ON THE BIONOMICS OF SOME NORTHERN MOSQUITO SPECIES (CULICIDAE: DIPTERA)

1950 ◽  
Vol 28d (2) ◽  
pp. 58-80 ◽  
Author(s):  
B. Hocking ◽  
W. R. Richards ◽  
C. R. Twinn
Keyword(s):  
Seasonal Changes ◽  
Meteorological Factors ◽  
Feeding Habits ◽  
Mosquito Species ◽  
Adult Population ◽  
Seasonal Development ◽  
Quantitative Estimates ◽  
Adult Feeding ◽  
Rearing Methods ◽  
Aedes Communis

The species of mosquitoes now known to occur at Churchill, Man., are listed and include 12 species of Culicinae and four of Chaoborinae. Evidence is advanced that one of these, Aedes communis DeG., may really be two species; and a method is suggested of separating some of the black-legged species of Aedes without using larval characters or scaling. Some observations on larval habits and habitats, seasonal development, species associations, temperature relationships, and natural enemies are given. Rearing methods used in the field and in the insectary are described. Seasonal changes in numbers, species composition, and activity of the adult population are studied, and quantitative estimates of the influence of meteorological factors on activity are made. Mating habits are described, and adult feeding habits, both on nectar and on blood, are discussed and illustrated. Observations on the development and number of eggs of some species are recorded.

The distribution and dynamics of ked populations, Melophagus ovinus Linn.

Parasitology ◽  
1948 ◽  
Vol 39 (1-2) ◽  
pp. 61-68 ◽  
Author(s):  
John Macleod
Keyword(s):  
Seasonal Changes ◽  
Adult Population ◽  
Early Spring ◽  
The Body ◽  
Late Spring ◽  
Late Winter ◽  
Lower Side ◽  
Breeding Area ◽  
Melophagus Ovinus ◽  
Seasonal Population

Observations have been made on the distribution of adult and pupal keds over the body of sheep and lambs, and the seasonal changes in density and distribution have been followed by a series of counts on the same sixteen sheep throughout a period of 13 months.The method of assessing the adult population by counting the living keds was checked by killing and subsequently counting them, and is believed to give approximately correct results. Pupal estimations by the ‘live-count’ method gave results apparently 50 % below the actual values.The ked population builds up rapidly during late winter and early spring to a maximum in April and early May. A decline begins in May, and by June the population has decreased very considerably. During summer the unshorn lambs show a continued decrease, which may be due in whole or part to loss by transference to the shorn sheep.The greatest concentration during the peak infestation is on the chest, lower shoulder and lower rib wool. In winter and spring the population is more generally distributed, and may show a preference for the upper over the lower side wool. In summer the back is practically deserted and the upper sides only sparsely populated. The throat and chest region is a favoured site the year round, and there is some indication that the throat may be a breeding area.Generally speaking, the adult and pupal populations are proportionately distributed. In late spring, however, puparia tend to be laid to a greater extent, relative to the adult population, in the lower than the upper surface fleece.The significance of the seasonal population shifts is discussed, and a method of eradicating keds from a flock by summer dipping of the lambs is outlined.

Studies on Paratylenchus nanus. II. Population changes around apple roots

1967 ◽  
Vol 18 (2) ◽  
pp. 279 ◽  
Author(s):  
JM Fisher
Keyword(s):  
Soil Sample ◽  
Low Temperatures ◽  
Seasonal Changes ◽  
Adult Population ◽  
Sufficient Information ◽  
Parasitic Stage ◽  
Fourth Stage ◽  
Population Changes ◽  
High Moisture ◽  
Males And Females

The numbers of fourth-stage larvae, males, and females of Paratylenchus nanus in soil around apple roots have been examined and found to be partially correlated with seasonal changes in the trees. Bulking subsamples did not give sufficient information, and so trends were determined from individual samples. Numbers of females were assessed: (a) per soil sample; (b) per weight of apple roots in each soil sample. In soil, all stages showed a decline in numbers in winter and summer and an increase in spring (Sept.). At other times numbers remained stationary except for a decrease in larval numbers in October and an increase in numbers of females between November and January. Males always exceeded females in number and larvae always exceeded adults, but the proportion of females in the adult population increased from 27% in winter to 41% in summer. Numbers of females – the only parasitic stage recovered – per gram of apple root decreased in winter, increased in spring, and decreased again in summer. Survival of the different stages under an adverse environment suggested that high temperatures in summer and low temperatures with high moisture levels in winter were partly responsible for the decreases in number at these times.

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