با همکاری مشترک دانشگاه پیام نور و انجمن فیزیولوژی و فارماکولوژی ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده محیط زیست، سازمان حفاظت محیط زیست، کرج

2 مربی،‌ دانشکده محیط زیست، کرج

3 دانشجوی سابق کارشناسی ارشد، محیط زیست، دانشگاه منابع طبیعی گرگان

4 استادیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

5 محیط بان، البرز مرکزی، اداره کل حفاظت محیط زیست استان مازندران

چکیده

هدف از این مطالعه رسیدن به یک مدل مطلوبیت زیستگاهی مبتنی بر داده‌های حضور خرس قهوه­ای ماده و شناسایی فاکتورهای مهم در انتخاب زیستگاه می باشد. شناسایی این مناطق نقش بسیار مهمی در حفاظت از خرس قهوه‌ای خواهد داشت. در این راه با توجه به عوامل مؤثر در تعیین کیفیت زیستگاه، نتایج حاصل به‌صورت یک نقشه پیش‌بینی پراکنش زیستگاه‌های مطلوب و اولویت‌بندی دامنه تغییرات متغیرهای زیست محیطی تأثیرگذار بر این مطلوبیت ارائه می‌شود. لذا داده‌های لازم برای مدیریت و حفاظت گونه و زیستگاه مطلوب آن از طریق تعیین پاسخ گونه به محیط‌زیست و پارامترهای شناسایی شده تسهیل خواهد شد. در این بررسی از روش بیشترین بی‌نظمی برای مدل‌سازی زیستگاه خرس قهوه‌ای در منطقه حفاظت شده البرز مرکزی استفاده شد. داده‌های در دسترس برای تعیین اولویت انتخاب زیستگاه شامل یک مجموعه نقاط حضور گونه براساس مشاهدات میدانی و همچنین متغیرهای زیست محیطی منطقه مورد مطالعه است. صحت مدل به دست آمده از نتایج، حد استاندارد بالای 89/0 را نشان می‌دهد. براساس تحلیل جک نایف نیز متغیر بارندگی سالیانه مؤثرترین پارامترهای حضور گونه بوده و همچنین پوشش گیاهی منحصر به فردترین اطلاعات را در اختیار مدل قرار داده است.
 

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