نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار گروه محیط زیست دانشگاه صنعتی خاتم الانبیاء (ص) بهبهانبهبهان، ایران و استادیار، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران
2 کارشناس ارشد، باشگاه پژوهشگران جوان و نخبگان، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
3 مربی گروه محیط زیست، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران
چکیده
چکیده
این مطالعه حاصل پژوهشی است که با هدف بررسی زیستشناسی و تعیین موفقیت زادآوری حواصیل شب Nyctiocorax nyctiocorax در جزیره علی سیاه رودخانه کارون در سالهای 87-86 انجام شده است. در این مطالعه مجموعاً 30 آشیانه به‌صورت تصادفی از طریق پیمایش با قایق انتخاب شد. زادآوری حواصیل شب با آشیانهسازی در 3 فروردین آغاز و در 30 خرداد با پرواز آخرین جوجه پایان یافت. از میان 91 تخم در 30 آشیانه انتخابی، بهطور متوسط 03/3 تخم در هر آشیانه وجود داشت و دستجات تخم نیز بین 2 تا 5 تخم متغیر بود. میانگین موفقیت زادآوری در مرحله تفریخ، لانهنشینی و لانهگریزی بهترتیب 73/63% (58=n)، 45/49% (45=n)، 05/45% (41=n) و موفقیت زادآوری کل نیز 74/52% محاسبه شد. دستجات تخم، گروه‌های همزاد و پارامترهای آشیانه تأثیر معنیداری روی موفقیت زادآوری نداشتند. بیشترین تلفات در مرحله قبل از تفریخ (26/36% و 33=n) و اغلب به‌دلیل عوامل طبیعی رخ داده است.
کلیدواژه‌ها
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