Short-term variability in composition and abundance of copepod populations were studied during the dry (winter) and rainy (summer) seasons, at the dam region of Jurumirim Reservoir, São Paulo, Brazil. An intensive sampling program was carried out during 30 days in each period of the year. Samples and measurements were taken every other day at 0, 5, 10, 15, 20 and 25 m depths. The relationship b...

Cotoneaster Medik. is an important and taxonomically complex group due to numerous variable forms. Therefore, it interesting object for taxonomical studies. Five new records, including transcaucasicus Pojark., C. minutus G. Klotz, afghanicus aitchisonii K. Schneid., ellipticus Hort ex Loudon are identified the first time from Iran. Moreover, meyeri Pojark. insignis reported second Flora of Iran...

Herein we discuss the geographic structure of genetic variation of the widely distributed lesser treefrog (Dendropsophus minutus) from the Guianas in a preliminary examination of the status of Guianan populations referred to this taxon. Current sampling is insufficient to determine the status of all lineages of this complex within South America, but our results do indicate the presence of crypt...