Individual, Temporal, and Seasonal Variation in Sperm Concentration in Tree Swallows
نویسندگان
چکیده
منابع مشابه
Concentration of ozone- its seasonal and temporal variation in Hyderabad
Measurement of ozone in the urban environment of Hyderabad was carried out synoptically at four different locations during the year 2011. The amount of ozone in the ambient air varied from 20 μg/m3 to 273 μg/m3 exhibiting wide temporal and seasonal variation. The ozone concentration is invariably peak at noon time and remained high during early summer and spring period. On many occasions 1-h oz...
متن کاملTemporal and Individual Variation in Offspring Provisioning by Tree Swallows: A New Method of Automated Nest Attendance Monitoring
Studies of the ecology and evolution of avian nesting behavior have been limited by the difficulty and expense of sampling nest attendance behavior across entire days or throughout a substantial portion of the nestling period. Direct observation of nesting birds using human observers and most automated devices requires sub-sampling of the nestling period, which does not allow for the quantifica...
متن کاملSeasonal variation in seminal characteristics, testicular measurements and plasma testosterone concentration in Iranian Khalkhali bucks
The aim of the present study was to determine seasonal variations in semen characteristics, testicular size, and plasma testosterone concentration in Iranian Khalkhali goats. An artificial vagina was used to collect semen from 10 bucks (2–4 years of age), from November 2013 to October 2014. Testicular circumference was higher (P<0.05) from September to October. Ejaculate volume, sperm ...
متن کاملVariation in Growth of Nestling Tree Swallows across Multiple Temporal and Spatial Scales
—Differences within a species in rates of growth of nestlings can be used as indicators of the quality of parental care, environmental conditions, and future success of offspring, whereas comparisons among different species may reflect a history of different ecological conditions or life-history strategies. The presesnt study examines the patterns of variation in growth in nestling Tree Swallow...
متن کامل: metadiscourse in introduction sections of applied linguistics and physics research articles: exploring variation in frequency and type
abstract in written mode of language, metadiscourse markers are used commonly to help writers in general and academic writers in particular to produce coherent and professional texts. the purpose of the present study was to compare introduction sections of applied linguistics and physics articles regarding their use of interactive and interactional metadiscourse markers based on the model pro...
15 صفحه اولذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Condor
سال: 2002
ISSN: 0010-5422,1938-5129
DOI: 10.1093/condor/104.4.803