FIRST RECORD OF CINARA (CINARA) CEDRI CEDRI MIMEUR (HEMIPTERA APHIDIDAE) IN BULGARIA

In 2017, damages caused by aphids were observed for the first time on Cedar trees in Bulgaria. In 2020, apterae specimens of Cinara (Cinara) cedri cedri were collected and identified on Cedrus atlantica and C. deodara in seven localities both on young trees in forest nurseries and on old trees in plantations or in green urban systems. The pest appears to be a serious threat to the health status and decorative characteristics of Cedar trees. In case of high population density, the needles are covered with large honeydew secretions and sooty mold.

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Behaviour of Red Deer (Cervus Elaphus L.) At Calving Time

Behaviour ◽

10.1163/156853975x00506 ◽

1975 ◽

Vol 55 (3-4) ◽

pp. 287-299 ◽

Cited By ~ 47

Author(s):

T.H. Clutton-Brock ◽

F.E. Guinness

Keyword(s):

Population Density ◽

Cervus Elaphus ◽

Red Deer ◽

Social Groups ◽

Flight Distance ◽

High Population ◽

High Population Density ◽

First Time

AbstractRed deer on the Isle of Rhum (Inner Hebrides) show a well defined calving peak in late May and early June. Just before calving, hinds leave their usual social groups and move away from areas of high population density. Calves spend most of the day lying away from their mothers and are visited at intervals. During these visits, mothers show increased vigilance and flight distance from observers. When disturbed close to their lying calves, hinds are unwilling to approach the calf's position and may move the calf to a new area during the following 24 hours. Calves select their lying position with care, preferring to lie in long vegetation in places where they are sheltered from sight and can see the ground in front of them. All these behaviour patterns change during the first four weeks after parturition. The behaviour of hinds breeding for the first time differs little from that of experienced mothers.

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First record of click Beetle Agriotes lineatus (Linneaus ) (Coleoptera : Elateridae )In the middle of Iraq

Baghdad Science Journal ◽

10.21123/bsj.8.1.244-248 ◽

2011 ◽

Vol 8 (1) ◽

pp. 244-248

Author(s):

Baghdad Science Journal

Keyword(s):

Population Density ◽

Potato Crop ◽

First Record ◽

Seasonal Occurrence ◽

High Population ◽

High Population Density ◽

College Of Agriculture ◽

Pheromone Dispenser ◽

Click Beetle ◽

Agriotes Lineatus

Trials were carried out in the middle of Iraq ( 3 different sites ) during 2009 to detecation and determined the seasonal occurrence of Agriotes lineatus L. Three YATOR funnel traps were used in each of these sites which baited with the specific pheromone of A. lineatus from the first of March to the end of October in the College of Agriculture - Abu- Ghraib / Provenance of Baghdad and AL-Nile / Provenance of Babylon , while in AL-Radhwania was used through May- June. Pheromone dispenser were changed every 6 weeks in each of these traps . Males of A. lineatus were found in all of the three sites , and the total number capture were 208 , 897 and 57 male / 3 traps / season in College of Agriculture , AL-Nile and AL-Radhwania respectively . This is the first record of this species in Iraq . Seasonal occurrence was lasted from mid of April to mid of July with peak population in the end of May in college of Agriculture, while lasted from April to first of July with peak population at the first of June in AL-Nile site. The high population density of Males in AL-Nile site indicate the economic important of A. lineatus in this site on many crops epically on Potato crop .

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Recruitment sex ratios in gray-tailed voles (Microtus canicaudus) in response to density, sex ratio, and season

Canadian Journal of Zoology ◽

10.1139/z03-116 ◽

2003 ◽

Vol 81 (8) ◽

pp. 1306-1311 ◽

Cited By ~ 7

Author(s):

Monica L Bond ◽

Jerry O Wolff ◽

Sven Krackow

Keyword(s):

Population Density ◽

Sex Ratio ◽

Resource Competition ◽

Sex Ratios ◽

Female Offspring ◽

High Population ◽

Reproductive Value ◽

High Population Density ◽

Adult Sex Ratio ◽

Sex Ratio Adjustment

We tested predictions associated with three widely used hypotheses for facultative sex-ratio adjustment of vertebrates using eight enclosed populations of gray-tailed voles, Microtus canicaudus. These were (i) the population sex ratio hypothesis, which predicts that recruitment sex ratios should oppose adult sex-ratio skews, (ii) the local resource competition hypothesis, which predicts female-biased recruitment at low adult population density and male-biased recruitment at high population density, and (iii) the first cohort advantage hypothesis, which predicts that recruitment sex ratios should be female biased in the spring and male biased in the autumn. We monitored naturally increasing population densities with approximately equal adult sex ratios through the spring and summer and manipulated adult sex ratios in the autumn and measured subsequent sex ratios of recruits. We did not observe any significant sex-ratio adjustment in response to adult sex ratio or high population density; we did detect an influence of time within the breeding season, with more female offspring observed in the spring and more male offspring observed in the autumn. Significant seasonal increases in recruitment sex ratios indicate the capacity of female gray-tailed voles to manipulate their offspring sex ratios and suggest seasonal variation in the relative reproductive value of male and female offspring to be a regular phenomenon.

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Aggregations of masked shrews ( Sorex cinereus ): density-related mating behavior? / Agrégation de musaraignes masquées ( Sorex cinereus ): accouplement relatif à la densité de la population?

Mammalia ◽

10.1515/mamm.70.1-2.86 ◽

2006 ◽

Vol 70 (1-2) ◽

Cited By ~ 2

Author(s):

Thomas J. Maier ◽

Katherine L. Doyle

Keyword(s):

Population Density ◽

Mating Behavior ◽

High Population ◽

High Population Density ◽

Genetic Analyses ◽

Highly Active ◽

Sorex Cinereus

AbstractLarge aggregations of shrews have been reported and various explanations offered for this seemingly rare behavior; however, there has been little evidence to support any particular interpretation. We observed two small aggregations of highly active vocalizing Sorex cinereus while performing wildlife surveys in forested habitats in central Massachusetts, USA. These observations, in conjunction with a review of other reports, including genetic analyses, strongly suggest that such aggregations of adult Sorex are associated with mating behavior, more readily observed during periods of high population density. Published accounts of such behavior may be rare because primarily large aggregations have been reported; however, smaller breeding aggregations may be common.

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