Abundance and Diversity of Winter Larval-fish Assemblages off Yumurtalık (Iskenderun Bay)

Year 2017, , 395 - 412, 01.12.2017

Sinan Mavruk

https://doi.org/10.17693/yunusae.v17i31121.356098

Abstract

Here, abundance, diversity and
composition of ichthyoplankton assemblages of İskenderun Bay was investigated
in winter period together with environmental conditions. For this purpose, a total
of 6 cruise works was performed between 7/12/2015 and 1/3/2016 at the six
stations located at 10, 30 and 60m depth contours off Yumurtalık, İskenderun
Bay. Samples were collected by using oblique tows of Bongo-60 net. During the
study, eggs and larvae of 67 species were collected. Median of observed
richness was 6 species per station and of abundance was 36 individual/10m².
Median of Shannon-Wiener diversity index and its evenness component Pielou
evenness index were 1.86 and 0.98 respectively. Bregmaceros nectabanus, Sparus
aurata, Etrumeus golanii, Gobius paganellus and Sardina pilchardus were dominant
species. Total abundance, richness and diversity of ichthyoplankton assemblages
were significantly lower at 10m depth contour. Within winter season, temporal
changes of ichthyoplankton composition were found to be significant. Amongst
the environmental conditions measured, only temperature was significantly
correlated with the species composition.

Keywords

Egg, Teleost Fish, Larvae, Mediterranean, Ichthyoplankton

Yumurtalık Açıklarında (İskenderun Körfezi) Kış Dönemi Larval Balık Topluluklarının Bolluk ve Çeşitliliği

Abstract

Bu çalışmada İskenderun Körfezi’nde kış mevsimi ihtiyoplankton
topluluklarının bolluk, çeşitlilik ve kompozisyonu çevresel koşullarla birlikte
ele alınmıştır. Bu amaçla 7/12/2015 ile 1/3/2016 tarihleri arasında 6 saha
çalışması gerçekleştirilmiş; İskenderun Körfezi, Yumurtalık açıklarındaki 10,
30 ve 60m derinlik konturlarına yerleştirilmiş 6 istasyonda oblik Bongo-60 Net
çekimleri yapılmıştır. Çalışma boyunca 67 türe ait yumurta ve larvalarla
karşılaşılmış olup, istasyon başına medyan tür sayısı 6, bolluk ise 36 adet/10m²
olarak tespit edilmiştir. Shannon-Wiener çeşitlilik indeksi ile Pielou
düzenlilik indeksine ait medyan değerleri sırasıyla 1.86 ve 0.98 olarak
hesaplanmıştır. Bregmaceros nectabanus,
Sparus aurata, Etrumeus golanii, Gobius
paganellus ve Sardina pilchardus
baskın türlerdir. İhtiyoplankton topluluklarının bolluk, zenginlik ve
çeşitliliği 10m derinlik konturunda istatistik açıdan önemli ölçüde düşük
bulunmuştur. İhtiyoplankton kompozisyonunun kış mevsimi içindeki zamansal
değişimlerinin istatistik açıdan önemli olduğu tespit edilmiştir. Ölçülen
çevresel koşullardan yalnızca sıcaklık değişimlerinin tür kompozisyonu üzerinde
etkili olduğu belirlenmiştir.

Keywords

Akdeniz, Kemikli Balık, Larva, Yumurta, İhtiyoplankton

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