Temporal and spatial changes of crustaceans in mixed eelgrass beds, Zostera marina L. and Z. noltii Hornem., at the Sinop peninsula coast (the southern Black Sea, Turkey)

This research was carried out to determine the macroben\udthic crustacean species associated with mixed eelgrass\udbeds (\udZostera marina\udand\udZ. noltii\ud) occurring in the upper-infralittoral zone of the Sinop peninsula coast (the southern Black\udSea, Turkey) and their bioecolological features. From June 2004 to April 2005, investigations were seasonally performed at\udthe depths of 2-4 m at 6 different stations chosen on the Sinop peninsula coast. As a result of the study, a total of 7057\udindividuals belonging to 55 species and 6 orders were identified. Amphipoda was the dominant group in terms of number\udof species (63% of the total of orders) and number of individuals (83% of the total individuals). Among these,\udAmpelisca\udpseudospinimana\udhad the highest dominance value with up to 1902 specimens (approximately 27%). However, Isopoda\udaccounted for 47% of the total biomass. The species that have the highest individual biomass was isopod,\udIdotea balthica\ud(35% of total biomass). According to a frequency index, 26 species were designated as constant, 13 species as common and\ud16 species as rare. The highest number of species (max. 26 species m\ud-2\ud) and number of individuals (2069 ind.m\ud-2\ud) were\udfound at station 4 in fall and summer and the lowest at station 1 in winter (min. 6 species m\ud-2\ud; 8 ind. m\ud-2\ud).Bu ara?t?rma Sinop Yar?madas? k?y?lar?n?n (G?ney Karadeniz,\udT?rkiye) ?st infralittoral zonunda yay?l?? g?steren\udkar???k deniz ?ay?r? yataklar?n?n (\udZostera marina\ud,\udZ. noltii\ud) makrobentik krustase t?rlerini ve biyoekolojik ?zelliklerini\udtespit etmek amac?yla y?r?t?lm??t?r. Ara?t?rmalar Haziran 2004-Nisan 2005 tarihleri aras?nda Sinop Yar?madas?\udk?y?lar?ndan se?ilen 6 farkl? istasyonda\ud2-4 m derinliklerde mevsimsel olarak ger?ekle?tirilmi?tir. Sonu? olarak, 6 ordoya\udait toplam 55 t?r ile bunlara ait 7057 birey tan?mlanm??t?r\ud. Amphipoda ordosu t?r (% 63) ve birey say?s? bak?m?ndan (%\ud83) en bask?n grup olup bunlardan 1902 bireyle (% 27)\udAmpelisca pseudospinimana\uden bask?n t?rleri olu?turmaktad?r.\udBununla birlikte, Isopoda toplam biyomas?n % 47?sini olu?tu\udrmaktad?r. Tespit edilen t?rler i?erisinde en y?ksek biyomas\udde?eri % 35 ile\udIdotea balthica\ud? ya aittir. Frekans indeksine g?re 26 t?r devaml?, 13 t?r yayg?n ve 16 t?r de seyrek olarak\udtan?mlanm??t?r. En y?ksek t?r (maks. 26 t?r. m\ud-2\ud) ve birey say?s? (2069 birey.m\ud-2\ud) 4 nolu istasyonda sonbahar ve yaz\udmevsiminde, en az t?r ve birey say?s? ise 1 nolu istasyonda k?? mevsiminde (min. 6 t?r.m\ud-2\ud; 8 birey.m\ud-2\ud) tespit edilmi?tir