بررسي بيوسيستماتيكي دو گونه از جنس زالزالك (Crataegus L.) در بخش هايي از غرب و مركز ايران

Assessment of Stability Index (SI) and effective environment factors on frequency of polychaete in Lengeh intertidal zone.

جنس زالزالك(Crataegus L.) به قبيله Crataegeae و زير تيره Maloideaeاز تيره Rosaceae (گل سرخ) تعلق دارد. اين جنس 150 تا 1200 گونه در جهان دارد. تحقيق حاضر به بازنگري دو گونه C. meyeri وC. persica در ايران از نظر ريخت شناسي اندام هاي مختلف و ريز ريختارشناسي دانه ها پرداخته است. نتايج حاصل از اين مطالعات نشان مي دهد گونه اي كه تحت عنوان C. persica از غرب و مركز ايران در فلور ايران و ايرانيكا گزارش شده است، مطابق مونوگراف مترادف گونه C. meyeri مي باشد.

For assessment of polychaete in Lengeh port, seasonal sampling done by using 2 transect of intertidal zone and 3 stations in each transect, during one year from October 2008 until July 2009 (quadrate size was 0/25m2 and sampling depth was 30-40 cm). Results of polychaetes numeration was showed that maximum number was in February and minimum number was in May. The Calculation of stability index (SI) of different groups, showed that opheliidae family is permanent group and spionidae family is temporary group and other groups are accidental. Results showed that salinity, organic matter and the kind of sediment are effective factors on abundance of polychaetes in this region.