Iranian Journal of Fisheries Sciences
مجله علوم شیلاتی ایران
IJFS
Agriculture
http://jifro.ir
1
admin
1562-2916
10.18869/acadpub.ijfs
en
jalali
1398
12
1
gregorian
2020
3
1
19
2
online
1
fulltext
en
Diversity and spatial distribution patterns of the benthic macrofauna communities in the southeast of the Caspian Sea (Golestan Province– Iran) in relation to environmental conditions
Ecology
Ecology
پژوهشي
Orginal research papers
Biodiversity and structure of the benthic macrofauna communities were studied in the southeast the Caspian Sea (Golestan Province – Iran) during one year from October 2014 to September 2015. Seasonal samplings were done at 6 stations in 3 transects. Depth, temperature, salinity, pH, E.C., total organic matter and grain size were measured. More than 4,037 individuals belonging to five orders, Polychaeta, Oligochaeta, Bivalvia, Diptera and Amphipoda, and eight families including Nereididae, Spionidae, Amphartidae, Tubificidae, Smelidae, Cardiidae, Chironomidae and Gammaridae were identified. In terms of total individuals, <em>Streblospio gynobranchiata</em>, <em>Hypania invalida</em> and <em>Cerastoderma lamarcki</em>, were the most abundant species, and Polychaeta were dominant in the research region. The highest density of all species was observed in autumn (1515 ind m<sup>2</sup>) and the lowest was observed in summer (698 ind m<sup>2</sup>). The maximum diversity, richness, and evenness were 1.36, 0.6 and 0.98, respectively. The results of distance-based redundancy analysis (db-RDA) showed that environmental factors such as salinity, depth and substrate type were all important in detecting the distribution pattern of macrobenthic species in the research region. The dominant species, <em>S. gynobranchiata, </em>was distributed in the areas with smaller grain size and higher TOM and muddy sediments and had the most correlation with salinity, temperature, pH and E.C. Species such as <em>T. fraseri</em>. <em>H. invalida</em> and <em>P. robustoides</em> showed more dependency on TOM and mud factors in the spring and summer, while their dependency became lower in autumn and winter. <em>Abra ovate</em> was less influenced by all factors except the substrate.
Community, Biodiversity, Macrofauna, Caspian Sea, Environmental factors, RDA
525
540
http://jifro.ir/browse.php?a_code=A-10-2319-1&slc_lang=en&sid=1
A.
Aliakbarian
akram.akbarian1361@gmail.com
100319475328460033849
100319475328460033849
Yes
Department of Fisheries and Environment, Gorgan University of Agricultural Science and Natural Resources, P. O. Box: 386, Gorgan, Iran.
R.
Ghorbani
rasulghorbani@gmail.com
100319475328460033850
100319475328460033850
No
Department of Fisheries and Environment, Gorgan University of Agricultural Science and Natural Resources, P. O. Box: 386, Gorgan, Iran.
H.
Fazli
hn_fazli@yahoo.com
100319475328460033851
100319475328460033851
No
Caspian Sea Ecological Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization, P.O.Box, 961, Sari, Iran
A.
Salman Mahiny
rassoulmahiny2gmail.com
100319475328460033852
100319475328460033852
No
Department of Fisheries and Environment, Gorgan University of Agricultural Science and Natural Resources, P. O. Box: 386, Gorgan, Iran.
S.
Yelghi
saeed393@yahoo.com
100319475328460033853
100319475328460033853
No
Inland Waters Aquatics Resources Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization, Gorgan, Iran
R.
Naddafi
Rahmat.Naddafi@slu.se
100319475328460033854
100319475328460033854
No
Department of Aquatic Resources, Institute of Coastal Research, Swedish University of Agricultural Sciences, 74242 Öregrund, Sweden