نشریه محیط زیست طبیعی

بررسی میزان موفقیت جوجه آوری گاوچرانک Bubulcus ibis در جزیرة علی سیاه در رودخانة کارون

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه محیط زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 دانش آموختة گروه محیط زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

بررسی مراحل تولید مثل و میزان موفقیت زاد آوری گاوچرانک یا اگرت­رمه­ای (Bubulcus ibis Linnaeus,1758) در جزیرة علی سیاه در رودخانة کارون در محدودة شهر اهواز از دی ماه سال 1392 آغاز و در خردادماه 1393 خاتمه یافت. در این بررسی مراحل و میزان موفقیت زاد آوری گاوچرانک در 60 آشیانه بررسی شد. مشاهدات نشان داد، زمان آغاز آشیانه سازی، اواخردی­ماه، میانگین دوران تفریخ تخم­ها 22 روز، میانگین تعداد تخم‌ها به ازاء هر آشیانه 9/3، میانگین دوران رشد جوجه‌ها 33 روز، اتمام جوجه­آوری اوایل خرداد ماه بود. اندازه­گیری ابعاد 234 تخم در 60 اشیانه نشان داد میانگین شاخص شکل تخم­ها، 56/75، میانگین حجم تخم­ها 8/14±97/20 سانتی مترمکعب، میانگین قطر کوچک تخم‌ها 06/1±36/28، میانگین قطر بزرگ تخم­ها 26/1±73/37 میلی متر، میانگین وزن تخم­ها 34/4±14/24 و میانگین وزن آشیانه­ها 40/9 ±98/463 گرم تعیین شد. میانگین دوران جوجگی nestling 13 روز، دوران Post-Nestling 16 روز، میانگین زمان پرواز کامل جوجه‌ها 14 روز تعیین شد. طول دورة زادآوری بین 84 تا 90روز، و میزان موفقیت جوجه­آوری 33/73 درصد تعیین شد. جمعیت جوجه­آوری گاوچرانک در جزیرة علی سیاه 448 جفت شمارش شد. مشاهدات در سال 1394 نشان داد که جزیرة علی سیاه لایروبی و از بین رفت و کلنی جوجه­آور اگرت رمه‌ای نیز متلاشی شد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of Breeding Success Rate of Cattle Egret Bubucus ibis at Ali-Siah Island in Karon River

نویسندگان [English]

  • Behrouz Behrouzi-Rad 1
  • Mostafa Zeinali Shalmaei 2

1 Academic Staff

2 Dpartmen of Environment office

چکیده [English]

Reproduction success rate of Cattle Egret Bubulcus ibis Linnaeus, 1758 carried out on the island of Ali Siah in Karon River in Ahvaz city since January 2013 and was completed in May 2014. In this study, the stages and success rate of species was measured in 60 nests. Observations showed that the start of nesting was late in December, the mean hatching time of eggs were 22 days, the average number of eggs per nest was 3.9, the average growth time of the chickens was 33 days, the end of the breeding was early in June. Measuring the size of 234 eggs in 60 nests showed that the average egg shape index was 75.56, the average volume of eggs was 20.99 ± 14.8 cubic meters, the mean small diameter of the eggs was 28.36 ± 1.96, the mean large diameter of the eggs were 37.73 ± 1.26 mm, the mean weight of eggs were 24.41 ± 4.34 gr, and the mean weight of nests were 463.98 ± 9.40 grams. The average Nestling time was 13 days, the average Post-Nestling time was 16 days, and the average total flight time for chickens was 14 days. The breeding period was 84-90 days and the reproductive success rate was 73.33%. The breeding population of Cattle Egret on the Ali Siah Island was estimated 448 pairs. Observations in 2015 showed that the Ali Siah Island was destroyed and breeding colony of the Cattle Egret was destroyed on this island.

کلیدواژه‌ها [English]

  • Cattle Egret
  • Success Rate of Reproduction
  • Breeding Stages
  • Ali Siah Island
  • Karon River
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نشریه محیط زیست طبیعی
دوره 70، شماره 4
دی 1396
صفحه 757-769