علوم زیستی دریا
shahram bazrafshan; nasrin sakhaee; ahmad savari; babak doustshenas; abdolali movahedinia
Abstract
Taxonomic studies on the Anomura larvae of the Persian Gulf are relatively few. This research has been done on larval stage of Diogenes sp. (Anomura: Diogenidae)on coastal waters of Bahmanshir River. Anomura is a group of decapodcrustaceans, including hermit crabsthat are cosmopolitan and could be found ...
Read More
Taxonomic studies on the Anomura larvae of the Persian Gulf are relatively few. This research has been done on larval stage of Diogenes sp. (Anomura: Diogenidae)on coastal waters of Bahmanshir River. Anomura is a group of decapodcrustaceans, including hermit crabsthat are cosmopolitan and could be found from coastal waters to 5000 m in depth. The larval stages differ among families of Anomura. Anomura larvalsamples collected by plankton net (mesh size of 300 µm) from seven stations in February 2011 to October 2012. Planktonic larval were sampled from the Bahmanshir River in north of the Persian Gulf. The larval stages illustrated and described in detail for Diogenes sp. Finally Diogenes sp. were identified and their schematic figures were made using Camera Lucida. Maximum value of the average abundance of larvae (12.3±3.4 ind.m3) was recorded in May. Also positive relationship betweensalinity with frequency of Diogenes sp. were found significantly using spearman correlation coefficients (P< 0.05).
asieh mirali; abdolali movahhedinia; rahim abdi; amirparviz salati
Volume 10, Issue 4 , September 2012, , Pages 15-21
Abstract
Water and electrolyte balance is vital for aquatic organisms in both hyper and hypo osmotic environments. Kidneys as excretory organs play an important role in osmoregulation and body fluid homeostasis. In this study a total number of 180 Sobayti (Teleost: Sparidentex hasta) were exposed to different ...
Read More
Water and electrolyte balance is vital for aquatic organisms in both hyper and hypo osmotic environments. Kidneys as excretory organs play an important role in osmoregulation and body fluid homeostasis. In this study a total number of 180 Sobayti (Teleost: Sparidentex hasta) were exposed to different salinities to assess changes in the kidney structure and alterations in plasma levels of electrolytes, glucose and cortisol. Salinity challenges were examined for a period of 14 days in four experimental groups: 40ppt as control and 5, 20 and 60 ppt as other experimental treatments. 24 hours after salinity challenge, significant changes were observed in the lumen diameter of the primary proximal tubule at the sections from trunk kidney in both 5 and 20 ppt conditions (P<0.05). Lumen diameter of the second part of the proximal tubule did not differ in any of the experimental salinities (P>0.05).However, lumen diameter of the distal tubule of nephron in the trunk kidney, increased significantly in 60 ppt treatment 48 hours from starting the experiment (P<0.05). The thickness of the epithelium tubule in both trunk and tail parts showed no significant differences during the adaptations (P>0.05). According to the results, histomorphological changes in the different parts of the kidney returned to the basic structure with in 24 to 48hours after exposure to different salinities.