تأثیر دوره‌های نوری و شدت نور مختلف بر قابلیت تولید تخم، درصد تخم‌گشایی، زمان رسیدگی جنسی و نسبت جنسی در Acartia clausi

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه زیست‌شناسی دریا، دانشکدة علوم پایه، دانشگاه آزاد اسلامی واحد لاهیجان، لاهیجان، ایران

2 کارشناسی ارشد گروه شیلات، دانشکدة منابع طبیعی، دانشگاه آزاد اسلامی واحد لاهیجان، لاهیجان، ایران

3 دانشیار گروه شیلات، دانشکدۀ علوم دامی و شیلات، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

4 دانشجوی دکتری گروه شیلات، دانشکده منابع طبیعی صومعه سرا، دانشگاه گیلان، ایران

5 کارشناس گروه زیست‌شناسی دریا، دانشکدة علوم دریایی و اقیانوسی، پردیس دانشگاه مازندران، بابلسر، ایران

چکیده

هدف از این تحقیق بررسی تأثیر دوره‌ها و شدت نور متفاوت در قابلیت تولید تخم، درصد تخم‌گشایی، زمان رسیدگی جنسی و نسبت جنسی بالغان در گونةAcartia clausi  در شرایط آزمایشگاهی بوده است. این زئوپلانکتوناز سواحل استان مازندران به وسیلة تور پلانکتون‌گیر 100 میکرونی جمع‌آوری شد و آزمایش‌ها در پنج تیمار 24:00، 18:06، 12:12، 06:18، 00:24 روشنایی/ تاریکی و در دو شدت نوری 50 و 1000 لوکس انجام شدند. نتایج نشان داد که بیش‌ترین میزان تولید تخم در شدت 50 لوکس و در 18 ساعت روشنایی، به میزان 31/4±02/20 عدد و کم‌ترین آن در شدت 1000 لوکس و 24 ساعت تاریکی به میزان 15/2±15/8 عدد بوده است. بیش‌ترین درصد تخم‌گشایی نیز در شدت 1000 لوکس و در 18 ساعت روشنایی به میزان 1/7±08/83 درصد و کم‌ترین آن 7/2± 17 درصد و در تیمار تاریکی مطلق تعیین شد. در تیمارهای مختلف تخم‌های این گونه قابلیت تخم‌گشایی را داشته، اما با کاهش مدت زمان حضور نور درصد تخم‌گشایی کاهش یافته است. مدت زمان رسیدگی جنسی، طی‌کردن مراحل ناپلیوسی و کوپه‌پودیت در شدت 50 لوکس و در 24 ساعت روشنایی سریع‌تر بوده و مدت آن 2/1±5/9 روز تعیین شد. همچنین نسبت جنسی بالغان در تیمارهای مختلف اختلاف معنی‌دار آماری نداشته‌اند. بنابراین برای تولید تخم و درصد تخم‌گشایی بالاتر و زمان بلوغ کوتاه‌تر، بهترین شرایط شدت نور پایین و دورة نوری 18 ساعت تعیین شد و نور ممتد با شدت بالا و تاریکی مطلق نیز برای این گونه نامناسب تشخیص داده شده است.
 
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The effect of photoperiod and light intensity on egg production, hatching rate, maturity time and adult sex ratio in Acartia clausi

نویسندگان [English]

  • Mohamad reza Rahimbashar 1
  • Maryam Yahya zade 2
  • Abolgasem Esmaieli fereidooni 3
  • Majid Rasta 4
  • Hor Torabi jafroudi 5
1 - Assistant Prof. Department of Marine Biology , Faculty of science ,Islamic Azad university , lahijan branch, Iran
2 - MSc. ,Department of fishery, Faculty of Natural Resources, Islamic Azad university , lahijan branch, Iran
3 ssociate Prof. Department of fishery, Faculty of Fishery science and Natural Resources of Sary , Iran.
4
5 Department of Marine Biology , Faculty of Marine and Oceanic Sciences Campus, University of Mazandaran , Babolsar, Iran
چکیده [English]

The aims of this study were to investigate the effect of photoperiod and light intensity on egg production and hatching rate in Acartia clausi in laboratory conditions. This zooplankton was collected from Caspian coastal waters of Mazandaran province by the use of a 100µ net. All tests were performed in five light treatments (photoperiod) namely 24:00, 18:06, 12:12, 06:18, 00:24 (light / dark), and two light intensities of 50 and 1000 lux. The results showed that the highest level of egg production was observed in 18 and 12 hours light treatment at low light intensity (50 Lux) 20/02±4/31, and the lowest level of  egg  production  was observed in 24 hours light  treatment at high light intensity (1000 Lux)8/15±2/15. The highest percentage of hatching was observed in the photoperiod of 18 hours light and high light intensity (83/08±7/1), and a lower percentage of hatching was observed in the treatment of darkness(17±2/7). Regarding the time for maturation this species reached to copepod it stage more quickly, and adult stag (there are this process in both high light intensity and low light intensity). About adult sex ratio there are not any signification  difference  between treatment.
 

کلیدواژه‌ها [English]

  • Acartia clausi
  • Caspian Sea
  • photoperiod
  • Light intensity
  • egg hatching

مراجع

 
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