No effect of the ectoparasite Crataerina pallida on reproduction of Common Swifts Apus apus

Previous studies have failed to ascertain negative effects of the Swift Lousefly Crataerina pallida parasitism on Common Swifts Apus apus. Abundances of C. pallida were experimentally manipulated to create broods experiencing either enhanced or reduced parasitism, and host life‐history traits were examined. No significant differences in clutch and brood size, rate of growth, asymptotic and fledging mass and size, or the number of fledglings per nest were observed. Reductions in parasite virulence may have developed due to the connection of C. pallida and host success, or costs may be borne by traits not influencing immediate fledging success.     

Stable isotopes reveal contrasting trophic dynamics between host–parasite relationships: A case study of Atlantic salmon (Salmo salar) and parasitic lice (Lepeophtheirus salmonis and Argulus foliaceus)

Across existing fish host–parasite literature, endoparasites were depleted in δ¹⁵N compared to their hosts, while ectoparasitic values demonstrated enrichment, depletion and equivalence relative to their hosts. δ¹³C enrichment varied extensively for both endo- and ectoparasites across taxa and host tissues. In our case study, sea lice (Lepeophtheirus salmonis) were enriched in δ¹⁵N relative to their farmed Atlantic salmon (Salmo salar) hosts, although the value contradicted the average that is currently assumed across the animal kingdom. Common fish lice (Argulus foliaceus) did not show a consistent trend in δ¹⁵N compared to their wild S. salar hosts. Both parasitic species had a range of δ¹³C enrichment patterns relative to their hosts. Farmed and wild S. salar had contrasting δ¹³C and δ¹⁵N, and signals varied across muscle, fin and skin within both groups. L. salmonis and A. foliaceus subsequently had unique δ¹³C and δ¹⁵N, and L. salmonis from opposite US coasts differed in δ¹⁵N. Given the range of enrichment patterns that were exhibited across the literature and in our study system, trophic dynamics from host to parasite do not conform to traditional prey to predator standards. Furthermore, there does not appear to be a universal enrichment pathway for δ¹³C nor δ¹⁵N in parasitic relationships, which emphasizes the need to investigate host–parasite linkages across species.     

Semi‐field evaluation of the effects of sub‐lethal doses of pesticides,with and without adult Schistocerca gregaria pheromone,on hoppers

Previously, we reported a chain of effects induced by phenylacetonitrile, the gregarious‐phase adult cohesion pheromone of the desert locust, Schistocerca gregaria (Forskål) (Orthoptera: Acrididae), on conspecific hoppers. Specifically, the nymphs became hyperactive and displayed high levels of intraspecific predation, as surviving individuals gradually shifted to the solitary phase. The findings suggested that the pheromone could induce a significant level of mortality of the nymphs and predispose them to greater sensitivity to lower doses of insecticides. In this study, we compared the effects of the pheromone and various doses of three pesticides (fipronil, malathion, and carbosulfan) to pheromone‐exposed and unexposed crowd‐reared hoppers in semi‐field enclosures. The pheromone on its own displayed a high level of cumulative mortality of the nymphs (89%). Although combinations with fractional pesticide doses gave control efficiencies that were, in most cases, higher than with individual pesticides, pheromonal and pesticidal effects were only partially complementary, probably because of the feeding‐deterrent effects of the pesticides and the resulting reduction in cannibalism. However, our results demonstrate the possibility of significantly reducing the levels of pesticides used in hopper control and, thus, their negative environmental effects.     

Negligible Egg Positive Rate of Enterobius vermicularis and No Detection of Head Lice among Orphanage Children in Busan and Ulsan,Korea (2014)

To determine whether pinworm infections and head lice infestations spread among children in orphanages, 117 children from 4 orphanages in Busan-si and Ulsan-si, Korea, were examined for enterobiasis and head lice infestation between January and February 2014. The overall rate of Enterobius vermicularis egg positivity was 0.85%, whereas none of the children had head lice infestations. The rate of pinworm infection was much lower among the orphanage children compared to the rates observed in previous studies among kindergarten and primary school students. Moreover, the risk factors for enterobiasis were less frequent among these subjects than previously reported. The personal hygiene and health of the orphanage children were supervised by a regular, employed nurse through a health education program. In conclusion, pinworm infection was efficiently controlled among the children in orphanages, and this might be related to good personal hygiene practices in Korea.     

Immunosuppression and feeding success of Ixodes ricinus nymphs on BALB/c mice

Abstract. The effect of repeated infestations of Ixodes ricinus (L.) nymphs on BALB/c mice was studied. Four successive infectations resulted in an increase of tick feeding success. Tick yield and mean engorged weight increased and the length of the feeding period was reduced significantly (P <0.05-0.01). The increase of specific anti-tick antibodies was not significant (P > 0.05). The blastogenic response of spleen lymphocytes to T-cell mitogens (Con A and PHA-P) was unimpaired or slightly enhanced, whereas the response to B-cell activators (LPS and PWM) was suppressed, as was the total antibody generation in vitro. The numbers of mast cells in murine skin at the tick attachment sites slightly decreased during the third infestation. The suppression of B-cell competence and of antibody generation, together with decrease of skin mast cell numbers in tick attachment sites, are considered to be responsible for enhancement of tick feeding success.     

毛真革赛螨雄螨和若螨描述(蜱螨亚纲:中气门目:胭螨科)

描述毛真革赛螨Gamasellus vibrissatus Emberson,1967雄螨、后若螨和前若螨。     

Pyrethroid resistance mechanisms in the head louse Pediculus capitis from Israel: implications for control

In Israel, the head louse, Pediculus capitis, developed resistance to DDT through the extensive use of this insecticide until the 1980s. In 1991, permethrin was introduced for control of DDT resistant P. capitis in Israel, leading to control failure of this pyrethroid insecticide by 1994. Pyrethroid resistance of P. capitis in Israel extends to phenothrin, which has not been used for louse control. We identified a glutathione S-transferase(GST)-based mechanism of DDT resistance in the Israeli head lice. This GST mechanism occurred before 1989, while permethrin resistance in P. capitis developed after 1994, suggesting that the main GST resistance mechanism selected by DDT use does not confer any pyrethroid cross-resistance. Esterase activity levels were equivalent in pyrethroid resistant and susceptible P. capitis field-collected in Israel, and in a susceptible strain of P. humanus, the body louse, indicating no involvement of any esterase-based mechanism in resistance. A weak monooxygenase-based permethrin metabolism resistance mechanism was the only factor identified which could account for any of the observed pyrethroid resistance in P. capitis. However, the lack of synergism of phenothrin resistance by piperonyl butoxide suggests that a non-oxidative mechanism is also present in the resistant lice. Therefore it seems probable that pyrethroid resistance in Israeli P. capitis is due to a combination of nerve insensitivity (knockdown resistance or 'kdr') and monooxygenase resistance mechanisms.     

Seasonal changes in a population of Menacanthus eurysternus (Mallophaga, Amblycera) on the common myna Acridotheres tristis

Seasonal changes in a population of Menacanthus eurysternus (Mallophaga, Amblycera) on the common myna Acridotheres trislis. International Journal for Parasitology 20: 1063–1065. Seasonal variations in a population of an amblyceran louse, Menacanthus eurysternus, infesting the common myna have been studied. Incidence of infestation, lice, index, and population structure of this species have been recorded in different months of the year; reasons for the population fluctuations are discussed.     

截头堆砂白蚁的分飞期研究

对不同群体、不同年份截头堆砂白蚁Cryptotermesdomesticus(Haviland)的分飞期进行了 3年的观察研究。结果表明 :该种白蚁的分飞期长 ,且 3年的分飞期基本相同。在广州 ,该种白蚁的分飞期一般在每年的 4月中旬至 8月下旬 ,分飞始期的第 1次分飞日最早为 4月 1 5日 ,分飞末期的最后 1次分飞日在 9月 1 6日。 1年中该种白蚁的分飞日数为 5 5～ 80日。其中 ,分飞日数较多的月份为 5～ 7月。其飞出时间一般在傍晚 1 8:3 0～ 1 9:3 0 ,以 1 9:0 0～ 1 9:3 0分飞次数最多 ,占分飞总数的 66 66%。     

Diet mixing and its effect on polyphagous grasshopper nymphs

We examined the effects of diet mixture on the nymphal performance of a polyphagous grasshopper Parapodisma subastris Huang by developing the first-stadium nymphs with either single or various combinations of plants occurring in their natural habitat. Intrinsic quality in terms of nymphal survival differed largely across the 16 plant species. However, even combinations of the six worst quality plants (survival 10% or less in each) greatly improved nymphal survival when compared to that of superior quality plants (more than 70% survival). In contrast, the addition of either of two inferior plants (more than 10% and less than 40% survival) to the superior plant affected neither the survival nor the adult mass. Thus, diet mixture can be particularly important when only low quality plants are available. The adaptive significance of diet mixture was discussed in relation to the habitat flora and foraging habits of the grasshopper in the present study.