دانلود مقاله انگلیسی رایگان:تغییرات فصلی در پارامترهای بیومتریک در جمعیت خرچنگ آبی در خطر انقراض (Cardisoma guanhumi): شاخص های ارزیابی و مدیریت - 2021
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  • Seasonal variation in biometric parameters in a population of the endangered blue land crab (Cardisoma guanhumi): Indicators for assessment and management Seasonal variation in biometric parameters in a population of the endangered blue land crab (Cardisoma guanhumi): Indicators for assessment and management
    Seasonal variation in biometric parameters in a population of the endangered blue land crab (Cardisoma guanhumi): Indicators for assessment and management

    سال انتشار:

    2021


    عنوان انگلیسی مقاله:

    Seasonal variation in biometric parameters in a population of the endangered blue land crab (Cardisoma guanhumi): Indicators for assessment and management


    ترجمه فارسی عنوان مقاله:

    تغییرات فصلی در پارامترهای بیومتریک در جمعیت خرچنگ آبی در خطر انقراض (Cardisoma guanhumi): شاخص های ارزیابی و مدیریت


    منبع:

    Sciencedirect - Elsevier - Regional Studies in Marine Science, 45 (2021) 101804: doi:10:1016/j:rsma:2021:101804


    نویسنده:


    چکیده انگلیسی:

    Cardisoma guanhumi is a land decapod crustacean distributed along the eastern Atlantic. Currently, this species is included in the Brazilian list of aquatic species overexploited or threatened with overexploitation. This study performed biometric analysis and assessed reproductive dynamics of the blue land crab Cardisoma guanhumi in Acaú-Goiana Extractive Reserve, a coastal marine protected area in northeast Brazil. From January 2019 to December 2020, biometric data were evaluated from 539 captured individuals by an artisanal trap. In addition, male gonads and hepatopancreas were removed and fixed in formalin solution to analyse morphological reproductive indicators by gonadal (GSI) and hepatosomatic (HSI) index calculation. In summary, the population of blue land crab showed 322 males and 217 females. We observed a difference in variation of mean seasonal carapace width (54.73– 56.67 mm). The condition factor ranged from 0.97 to 1.07, showing significant differences between the years and the seasons with high values observed in the dry season in 2019 and 2020. The weight– length relationships showed negative allometric growth for males (b = 2.586, a = 0.010) and females (b = 2.229, a = 0.291). The monthly distribution of the hepatosomatic (HSI) index did not show a clear annual pattern, but GSI differed between the months, indicating two seasonal groupings of Jan–Feb and May–August–Nov. The reproductive indicators of C. guanhumi evaluated here may indicate that the environmental influence and fishing pressure are the main factors that drive its reproductive seasons. Thus, it is noteworthy to indicate conservation efforts from January to April, when should be considered the breeding season for the species. In addition, long-term monitoring in the Extractive Reserve Acaú- Goiana must be considered for studies of population structure and gene flow of Cardisoma guanhumi, prioritizing the preservation of their habitats.
    Keywords: Crab harvesters | Condition factor | Growth | Reproduction | Gecarcinidae


    سطح: متوسط
    تعداد صفحات فایل pdf انگلیسی: 11
    حجم فایل: 1879 کیلوبایت

    قیمت: رایگان


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