Тип публикации: статья из журнала
Год издания: 2021
Идентификатор DOI: 10.6620/ZS.2021.60-53
Ключевые слова: saline rivers, ostracods, diet, fatty acid markers
Аннотация: Saline rivers are highly productive ecosystems in arid regions. The meiobenthic community (bottom meiofauna) and its dominant representatives are one of the least studied components of these aquatic ecosystems. Ostracods Cyprideis torosa and Heterocypris salina are major consumers among the species of bottom meiofauna in saline rivПоказать полностьюers flowing into the hyperhaline Lake Elton (Volgograd Region, Russia). We estimated the abundance, biomass and production of C. torosa, the dominant species at the mouth of the polyhaline Chernavka River (average salinity is similar to 30 g l(-1)), and H. salina, the dominant species at the mouth of the mesohaline Bolshaya Samoroda River (similar to 13 g l(-1)), in spring (May) and summer (August). Additionally, we studied the composition and content of fatty acids of the ostracods and their potential food sources (bottom sediments with bacterial-algal mats). We found that the abundance and biomass (wet weight with shells) of C. torosa in the Chernavka River and H. salina in the Bolshaya Samoroda River reached 3.5 x 10(6) ind. m(-2) and 117 g m(-2), and 1.1 x 10(5) ind. m(-2) and 12 g m(-2), respectively. The first species formed on average about 85% of the total abundance and 96% of the total biomass of the meiobenthos, and the second one, about 13% and 31%, respectively. The daily production of C. torosa and H. salina can reach 249 and 36 mg m(-2) ash-free dry weight, respectively. The results indicate that these species may play an important role in the total flow of matter and energy in the studied habitats. Based on the fatty acid (FA) composition of the ostracods and their food sources, it was found that C. torosa mainly consumed diatoms, while H. salina preferred bacteria, cyanobacteria, and green algae. Differences between the species were greater than differences between the bottom sediments from the rivers. It may mean that the ostracods selectively consumed different food items that may be related to the different nutrient requirements of the species. Seasonal changes in the FA compositions of the ostracods were higher than in their food sources (bottom sediments), which also indicates selective feeding of the species.
Журнал: ZOOLOGICAL STUDIES
Выпуск журнала: Vol. 60
Номера страниц: 53
ISSN журнала: 10215506
Место издания: TAIPEI
Издатель: BIODIVERSITY RESEARCH CENTER, ACAD SINICA