Seasonal variability in the palatability of freshwater macrophytes: a case study

Hydrobiologia ◽  
2006 ◽  
Vol 570 (1) ◽  
pp. 89-93 ◽  
Author(s):  
A. Elger ◽  
M. H. Barrat-Segretain ◽  
N. J. Willby
2017 ◽  
Vol 151 ◽  
pp. 358-364 ◽  
Author(s):  
Jessica Koura ◽  
Rima Manneh ◽  
Rafik Belarbi ◽  
Vanessa El Khoury ◽  
Makram El Bachawati

2021 ◽  
Vol 35 (3) ◽  
pp. 456-465
Author(s):  
Adriano Antonio Brito Darosci ◽  
Frederico Scherr Caldeira Takahashi ◽  
Carolyn Elinore Barnes Proença ◽  
Lucia Helena Soares-Silva ◽  
Cássia Beatriz Rodrigues Munhoz

2003 ◽  
Vol 37 ◽  
pp. 119-122 ◽  
Author(s):  
Anders Svensson ◽  
Pauli Baadsager ◽  
Asbjørn Persson ◽  
Christine Schøtt Hvidberg ◽  
Marie-Louise Siggaard-Andersen

AbstractThe aim of this case study is to quantify the seasonal variability in crystal properties and to discuss the reason for the variability. A continuous 1.10 m long vertical thin-section profile covering approximately five annual cycles has been obtained from the North Greenland Icecore Project (NorthGRIP) ice core at around 301 m depth. The crystal outline and the c-axis orientation of more than 13000 crystals in the profile have been measured on a new Australian automated ice-crystal analyzer. In 2.5 cm resolution we observe a strong seasonal variability in crystal areas of >30%deviation from the average value of 6.7 mm2. Each year, a band of smaller crystals is observed in ice deposited during spring. The area distribution function is found to be close to a lognormal distribution. The crystal areas are compared to the concentration of chemical impurities in the ice; at a 5 cm resolution, the best correlation is found with the concentration of Ca2+. Our results show no seasonal variability of the average c-axis orientation of ice crystals.


Author(s):  
Beth Posta ◽  
Robert Huber ◽  
Donald E. Moore III

One of the greatest challenges for zoo managers is ensuring the best possible welfare for zoo elephants. Few studies have focused on behavioral health of elephants over a 24-hour period and across seasons, making evaluations of behavioral variation challenging. This study examined the behavior of two zoo-housed African elephants (Loxodonta africana) over a two-year period to determine the roles of 1) indoor/outdoor housing, 2) time of day, and 3) seasonal variation on activity. Daytime behavioral differences were contrasted with nighttime activity, and across seasons. Significant differences were noted when the elephants were indoors vs. outdoors, between day and night, and between summer and winter, suggesting that evaluations of zoo elephant activity should occur throughout circadian cycles and account for seasonal variability


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