EVALUATION OF THE ROLE OF CERTAIN MORTALITY FACTORS OF Coccinella undecimpunctata L. (COLEOPTERA: COCCINELLIDAE) ON DIFFERENT CROPS AT KAFR EL-SHEIKH GOVERNORATE.

AbstractA knowledge of ecological principles is essential to the successful development of future research on pest control problems in Canadian orchard entomology. Such knowledge should be especially helpful in spotlighting omissions in past studies as well as indicating new areas of study in the future. In particular, the ecosystem concept should serve not only as a basis for evaluating and bringing together existing data but also as a guide in the collection, integration and interpretation of new data.Our approach should be to study the population dynamics of major arthropod pests in Canadian apple orchards to obtain data of the fundamental kind on natural populations of these species. Since this approach is dependent on precise measurement of the population and its mortality factors, as well as on the mathematical modelling of the data obtained, unambiguous deduction and greater understanding and utilization of the results would then be possible.Examples from a recent eight-year study of the population dynamics of two pest species in Canadian apple orchards reveal that the fundamental approach to pest problems in Canada is both feasible and practical, and that the results can yield considerable insight into the role of mortality factors in population regulation as well as in control of pest stages of economic importance.

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Intraguild predation between the aphidophagous ladybird beetles Harmonia axyridis and Coccinella undecimpunctata (Coleoptera: Coccinellidae): The role of intra and extraguild prey densities

Biological Control ◽

10.1016/j.biocontrol.2008.03.004 ◽

2008 ◽

Vol 46 (2) ◽

pp. 140-146 ◽

Cited By ~ 42

Author(s):

Marlene Nóia ◽

Isabel Borges ◽

António Onofre Soares

Keyword(s):

Intraguild Predation ◽

Harmonia Axyridis ◽

Ladybird Beetles ◽

Coccinella Undecimpunctata

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Hemorrhagic Transformation in Ischemic Stroke and the Role of Inflammation

Frontiers in Neurology ◽

10.3389/fneur.2021.661955 ◽

2021 ◽

Vol 12 ◽

Author(s):

Elena Spronk ◽

Gina Sykes ◽

Sarina Falcione ◽

Danielle Munsterman ◽

Twinkle Joy ◽

...

Keyword(s):

Ischemic Stroke ◽

Immune System ◽

Reperfusion Therapy ◽

Hemorrhagic Transformation ◽

Stroke Severity ◽

Mortality Factors ◽

Increased Risk ◽

Relationship Of ◽

The Relationship

Hemorrhagic transformation (HT) is a common complication in patients with acute ischemic stroke. It occurs when peripheral blood extravasates across a disrupted blood brain barrier (BBB) into the brain following ischemic stroke. Preventing HT is important as it worsens stroke outcome and increases mortality. Factors associated with increased risk of HT include stroke severity, reperfusion therapy (thrombolysis and thrombectomy), hypertension, hyperglycemia, and age. Inflammation and the immune system are important contributors to BBB disruption and HT and are associated with many of the risk factors for HT. In this review, we present the relationship of inflammation and immune activation to HT in the context of reperfusion therapy, hypertension, hyperglycemia, and age. Differences in inflammatory pathways relating to HT are discussed. The role of inflammation to stratify the risk of HT and therapies targeting the immune system to reduce the risk of HT are presented.

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Wolf predation in the Burwash caribou herd, southwest Yukon

Rangifer ◽

10.7557/2.6.2.638 ◽

1986 ◽

Vol 6 (2) ◽

pp. 137 ◽

Cited By ~ 3

Author(s):

David A. Gauthier ◽

John B. Theberge

Keyword(s):

Rangifer Tarandus ◽

Climatic Factors ◽

Mortality Factor ◽

Rangifer Tarandus Caribou ◽

Limited Data ◽

Mortality Factors ◽

Wolf Predation ◽

Calf Mortality ◽

Annual Mortality

The role of wolf predation as a proximate mortality factor influencing caribou herd growth was assessed in the Burwash herd (400 animals) in the southwest Yukon between 1980 - 1982. Ten to 14 wolves in two packs preyed primarily on caribou (Rangifer tarandus caribou) and moose (Alces alces) with disproportionate consumption of caribou (relative to available biomass) in the rut and winter periods. Wolf predation was responsible for 72% of total annual mortality in 1980 - 1981 and 46% in 1981 - 1982. Losses due to human harvest varied between 7 to 13%. Additional limited data on climatic factors and winter forage indicated forage-climate were not major proximate mortality factors in 1980 - 1981, but that early-calving climate may have been a factor in increased calf mortality in 1982.

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Role of predation and hunting on eastern cottontail mortality at Cape Cod National Seashore, Massachusetts

Canadian Journal of Zoology ◽

10.1139/z08-064 ◽

2008 ◽

Vol 86 (8) ◽

pp. 918-927 ◽

Cited By ~ 10

Author(s):

Kelly M. Boland ◽

John A. Litvaitis

Keyword(s):

Weather Conditions ◽

Cape Cod ◽

Sylvilagus Floridanus ◽

Limited Information ◽

Mortality Factors ◽

Northern Edge ◽

Eastern Cottontail ◽

Partial Compensation ◽

National Seashore

The degree that hunting may influence game populations depends on whether hunting mortality is additional to (additive) or replaces (compensatory) natural-caused mortalities. In response to limited information on the effects of exploitation on eastern cottontail ( Sylvilagus floridanus (J.A. Allen, 1890)) populations within Cape Cod National Seashore (CCNS), we initiated an investigation of cause-specific mortality using transmitter-equipped cottontails in hunted and nonhunted areas as a way to examine the additive versus compensatory aspect of hunting. Predation caused >70% of all deaths, whereas hunting caused 10% of deaths in the areas sampled. Survival rate was substantially lower among hunted sites (0.05) than at nonhunted sites (0.19) during the winter–spring of year 1, but there was no difference between hunted (0.33) and nonhunted (0.40) sites during year 2. Lower survival in year 1 was likely due to deep and persistent snow that increased vulnerability to predation and probably reduced the prospect for hunting mortalities to be compensated by reductions among other mortality factors. However, at least partial compensation apparently occurred during year 2 when winter weather was less severe. Cottontails at CCNS are near the northern edge of their geographic range and therefore may be ultimately limited by severe weather conditions. Compared with predation, we do not believe that the current levels and distributions of hunting influence cottontail populations at CCNS.

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