نتایج جستجو برای: overwintering population
تعداد نتایج: 695225 فیلتر نتایج به سال:
A bottom-mounted upward-facing 38-kHz echo sounder was deployed at ~400 m and cabled to shore in Masfjorden (~60°52'N, ~5°24'E), Norway. The scattering layers seen during autumn (September-October) 2008 were identified by trawling. Glacier lanternfish (Benthosema glaciale) were mainly distributed below ~200 m and displayed three different diel behavioral strategies: normal diel vertical migrati...
Since most insects are unable to survive internal ice formation a key factor in their overwintering survival is the regulation of the temperature at which they spontaneously freeze. To enhance their supercooling capacity overwintering insects eliminate endogenous ice nucleators, accumulate low-molecular-weight polyols and sugars, and synthesize hemolymph antifreeze proteins. A number of freeze-...
Morphological differences between the adults of overwintering and non-overwintering generations of the sawfly Pristiphora leucopus (Nematinae) are described and illustrated, as well as characters that distinguish P. leucopus from the closely similar P. armata. In the basal hymenopteran lineages (‘Symphyta’), seasonal polyphenism is so far only definitely recorded in the Sterictiphorinae (Argida...
Sixteen monthly visits were made to the Ndumu game reserve when resting Aedes circumluteolus mosquitoes were collected on the ground. The population density reached exceedingly high levels 7 or more days after the Usutu and/or Pongola rivers inundated their flood plains, and was related mainly to river flooding and far less to local rainfall. During dry months male Ae. circumluteolus disappeare...
Annual migratory movements can range from a few tens to thousands of kilometers, creating unique energetic requirements for each specific species and journey. Even within the same species, migration costs can vary largely because of flexible, opportunistic life history strategies. We uncover the large extent of variation in the lifetime migratory decisions of young white storks originating from...
shot hole caused by wilsonomyces carpophilus is one of the main constraints to prune fruit production in iran particularly in khorasan razavi province. it causes foliage shot hole in spring and early summer; fruit-spotting and cankers on limbs and twigs during autumn rains. the fungus was isolated from the lesions of twigs and was purified on pda. the pathogenicity and virulence on detached twi...
Sunn Pest, Eurygaster spp. (Hemiptera: Scutelleridae), is the most important pest being able to cause significant losses on wheat yield and quality in Türkiye. To monitor overwintered adult population, this study was carried out 41 sites 19 locations during two consecutive years. The samplings were performed April May both During study, economic threshold, which 0.8 adults per square meter, obt...
First posted February 1, 2021 For additional information, contact: Director, Upper Midwest Environmental Sciences CenterU.S. Geological Survey2630 Fanta Reed RoadLa Crosse, WI 54602 Historical estimates of the area occupied by overwintering Danaus plexippus (monarchs) in central Mexico (between winters 1976 and 1991) were published García-Serrano others (2004) more recently Mawdsley (2020). Our...
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