Suchergebnisse

Aerial surveys of coastal waters (27 216 km2) in the western Gulf of Carpentaria during the dry season
of 1984 and wet season of 1985 indicated no major seasonal changes in distribution and relative
abundance of dugongs. Minimum population size in the dry season was estimated as 16 816 � 2946
(standard error), with a relative density of 0.62 k 0.11 km-2, and that for the wet season 16 846 + 3257,
with a relative density of 0.62 � 0.12 km-2. The estimates exclude 5% of observations which could
have been either dugongs or Irrawaddy dolphins, and were corrected for submerged dugongs and those
missed on the surface. Dugongs were unevenly distributed over the study area, and neither mean group
size nor proportion of calves varied between seasons. Dugong abundance was correlated with area of
available seagrass. The catch rate of dugongs by Aboriginal people off Numbulwar decreased six-fold
between the 1960s and 1985 (60 to 10 p.a.), possibly due to excessive hunting.

The aim of this present study is to evaluate the seasonal variation of Aedes aegypti, the primary vector for Dengue virus, in two different localities. They are Kothankudikuppam and Tiruvetkalam in Annamalai Nagar (Town Panchayt) Chidambaram (Taluk), Cuddalore (District) Tamil Nadu, India. In this experiment, the prevalence of Ae. aegypti was detected by three types entomological indices such as house index (HI), breteau index (BI) and container index (CI). Results revealed that the highest HI and BI were recorded in Kothankudikuppam, during the pre-monsoon season (July-September, 2016) whereas highest CI was notices in pre monsoon of Tiruvetkalam. The maximum rainfall for the year 2016 also occurs during the same pre monsoon of our results when comparing to other seasons. The results obtained shows that necessary control measure can be implemented in these selected localities during the prevalence season either by individuals or the government to curb the population of Ae. aegypti and in turn reduce the dengue incidences in the same localities.

This study describes the seasonal distribution of larvae, nymph, and adult life stages for 3 species of ixodid ticks collected by tick drag and sweep methods from various habitats in the Republic of Korea (ROK). Grasses less than 0.5 m in height, including herbaceous and crawling vegetation, and deciduous, conifer, and mixed forests with abundant leaf/needle litter were surveyed at United States (US) and ROK operated military training sites and privately owned lands near the demilitarized zone from April-October, 2004 and 2005. Haemaphysalis longicornis Neumann adults and nymphs were more frequently collected from April-August, while those of Haemaphysalis flava Neumann and Ixodes nipponensis Kitaoka and Saito were collected more frequently from April-July and again during October. H. longicornis was the most frequently collected tick in grass habitats (98.9%), while H. flava was more frequently collected in deciduous (60.2%) and conifer (57.4%) forest habitats. While more H. flava (54.1%) were collected in mixed forest habitats than H. longicornis (35.2%), the differences were not significant. I. nipponensis was more frequently collected from conifer (mean 8.8) compared to deciduous (3.2) and mixed (2.4) forests. ; OAIID:oai:osos.snu.ac.kr:snu2013-01/102/0000051105/9 ; SEQ:9 ; PERF_CD:SNU2013-01 ; EVAL_ITEM_CD:102 ; USER_ID:0000051105 ; ADJUST_YN:Y ; EMP_ID:A077262 ; DEPT_CD:551 ; CITE_RATE:.881 ; FILENAME:2013 kjp-51-319 seasonal distribution of ticks in four habitats.pdf ; DEPT_NM:수의학과 ; SCOPUS_YN:Y ; CONFIRM:Y

As part of a field ecology study of arbovirus and malaria activity in the Amazon Basin, Loreto Department, Peru, we collected mosquitoes landing on humans at a forest site and inside and outside of residences and military barracks at periurban, rural, and village sites. We collected 11 Anopheles spp. from these four sites. An. darlingi, the principal malaria vector in the region, accounted for 98.7% of all Anopheles spp. collected at Puerto Almendra. Peaks in landing activity occurred during the December and April collection periods. However, the percent of sporozoite-positive Anopheles spp. was highest 1–2 months later, when landing activity decreased to approximately 10% of the peak activity periods. At all sites, peak landing activity occurred about 2 hours after sunset. These data provide a better understanding of the taxonomy, population density, and seasonal and habitat distribution of potential malaria vectors within the Amazon Basin region.