بررسی تغییرات محیطی بر ویژگی‌های قورباغه درختی (Hyla savignyi Audouin, 1827)، تولید صوت و تلاش تولیدمثلی در جنس نر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زیست شناسی، دانشکده علوم، دانشگاه اراک، اراک، ایران

2 گروه خزنده و دوزیست شناسی فلات ایران، دانشگاه رازی، کرمانشاه، ایران

چکیده

درک تکامل تاریخ زندگی مستلزم تجزیه تحلیل تعادل بین انرژی اختصاص داده شده به فعالیت‌های رشد، نمو، تولیدمثل و چگونگی تنظیم این تعادل برای به حداکثر رساندن موفقیت تولیدمثل در طول زندگی است. از سوی دیگر، تماس‌های صوتی دارای نقش اساسی در خصوصیات تاریخ زندگی می‌باشند که از ارتباط مستقیم با فعالیت‌های تولیدمثلی و در نهایت موفقیت تولیدمثلی برخوردارند. با توجه به نقش مؤثر محیط بر ویژگی‌های دوزیستان، هدف اصلی این تحقیق مطالعه تغییرات محیطی بر صفات صوتی و میزان تلاش تولیدمثلی در جمعیت‌های جنس نر قورباغه درختی H. savignyi در مرکز و غرب ایران می‌باشد. جهت بررسی تلاش تولیدمثلی، صفات وزن و اندازه بیضه در کنار صفات وزن و طول بدن (SVL) افراد در جمعیت‌های H. savignyi در دامنه ارتفاعی 1000-2117 متر مورد مطالعه قرار گرفتند. همچنین جهت انجام مطالعات صوتی، تعداد پنج صفت استاندارد طول صوت (CD)، فاصله بین دو صوت متوالی (IC)، طول نت (ND)، فاصله بین دو نت متوالی (IN) و تعداد نت‌ها در هر صوت (N/C) این گونه در جمعیت‌ها و طیف‌های دمایی متفاوت مورد مطالعه و بررسی قرار گرفت. مطالعه صفات کمی بیضه و صفات مرتبط با وضعیت بدن (SVL و وزن)، وجود یک ارتباط منفی معنادار را در وزن و اندازه بیضه با افزایش ارتفاع نشان داد، در حالی که این ارتباط برای دو صفت SVL و وزن افراد نتیجه عکس را در پی داشت که بازگوکننده وجود یک تعادل بین فعالیت‌های رشد و تولیدمثل در این گونه می‌باشد. نتایج مقایسه تماس‌های صوتی نشان داد که صوت‌های H. savignyi در همه‌ی جمعیت‌ها از ساختار مشترکی برخوردارند. از سوی دیگر، تأثیر درجه حرارت بر پارامترهای صوتی به صورت معناداری (005P) حاکی از نقش تعیین کننده‌ی دما بر کلیه‌ی ویژگی‌های صوتی مورد مطالعه بود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Environmental Changes on the Characteristics of Tree Frog (Hyla Savignyi, Audouin, 1827); Acoustic Production and Reproductive Effort in Male Sex

نویسندگان [English]

  • Raziyeh Alaei 1
  • Alireza Pesarakloo 1
  • Masoumeh Najibzadeh 2
1 Department of Biology, Faculty of Science, Arak University, 3813853945 Arak, Iran
2 Iranian Plateau Herpetology Research Group (IPHRG), Razi University, 6714967346 Kermanshah, Iran
چکیده [English]

Understanding the evolution of life history requires analyzing the balance between the energy devoted to growth, development, and reproduction activities and how to adjust this balance to maximize lifetime reproductive success. On the other hand, advertisement calls play an essential role in the characteristics of life history, having a direct relationship with the activities of production and finally the success of the reproductive organ. Considering the effective role of environment on characteristics of amphibians, the main purpose of our study was to study the environmental variations of acoustic traits and reproductive investment in male populations of H. savignyi tree frog in central and western Iran. For investigating the production investment, testicular weight, and size along with body weight and length (SVL) traits in all populations of H. savignyi were studied at altitude range of 1000-2117 m. Moreover, for acoustic studies, five standard acoustic traits Call duration (CD), Inter-call interval (IC), Note duration (ND), Inter-note interval (IN), and Number of note per call (N/C) of this species were studied in different populations and temperature ranges. The study of quantitative testicular traits and traits related to body features (SVL and weight) showed a significant negative relationship in testicular weight and size with increasing altitude, while this relationship followed the opposite result for both SVL and weight, indicating a balance between growth and reproductive activities in this species. The results of comparison of advertisement calls showed that H. savignyi calls have a common structure in all populations. Moreover, the effect of temperature on acoustic parameters significantly (P≤0.05) reflected the determining role of temperature on all the studied acoustic characteristics.
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کلیدواژه‌ها [English]

  • Hyla savignyi
  • Reproductive Investment
  • Environmental Variations
  • Advertisement Calls
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