شاركنا تاريخ ميلادك!
تاريخ الميلاد
تاريخ الميلاد المدخل غير مكتمل يرجى ادخال تاريخ ميلاد صحيح
×
Minimum Pool and Bull Trout Prey Base Investigations at Beulah Reservoir, Final Report for 2008: Open-File Report 2009-1068 by Brien P. Rose, Matthew G. Mesa, United U. S. Department of the Interior - Paperback
66.15 درهم

Minimum Pool and Bull Trout Prey Base Investigations at Beulah Reservoir, Final Report for 2008: Open-File Report 2009-1068 by Brien P. Rose, Matthew G. Mesa, United U. S. Department of the Interior - Paperback

كن أول من يقيِّم هذا المنتج 

66.15 درهم 

  - ستوفر -66.16 درهم
الأسعار تشمل ضريبة القيمة المضافة  التفاصيل
الشحن مجاني التفاصيل
رقم ال ISBN
9781288690244
الفئات
سياسة
الكاتب
Brien P. Rose, Matthew G. Mesa, United U. S. Department of the Interior
الناشر
Bibliogov
الوصف:

Beulah Reservoir in southeastern Oregon provides irrigation water to nearby farms and supports an adfluvial population of threatened bull trout (Salvelinus confluentus). Summer drawdowns in the reservoir could affect forage fish production and overwintering bull trout. To assess the impacts of drawdown, we sampled fish, invertebrates, and water-quality variables seasonally during 2006-08. ...

تشحن من الولايات المتحدة
اشحن الى دبي (تغيير المدينة)
التوصيل خلال الأربعاء ٦ يونيو - الجمعة ٨ يونيو الي دبي

حالة السلعة:
جديدة
البائع:
InternationalBookStore (88% تقييم ايجابي)

معلومات المنتج

  •  

    المواصفات

    رقم ال ISBN
    9781288690244
    الفئات
    سياسة
    الرقم المميز للسلعة
    2724354360334
    المؤلفين
    الكاتب
    Brien P. Rose, Matthew G. Mesa, United U. S. Department of the Interior
    المؤلفين
    الناشر
    Bibliogov
    رقم ال ISBN
    9781288690244
    الفئات
    سياسة
    الرقم المميز للسلعة
    2724354360334
    المؤلفين
    الكاتب
    Brien P. Rose, Matthew G. Mesa, United U. S. Department of the Interior
    المؤلفين
    الناشر
    Bibliogov
    معلومات تقنية
    غلاف الكتاب
    غلاف عادي
    اللغات والبلدان
    لغة الكتاب
    الانجليزية
    إقرأ المزيد
  •  

    الوصف:

    Beulah Reservoir in southeastern Oregon provides irrigation water to nearby farms and supports an adfluvial population of threatened bull trout (Salvelinus confluentus). Summer drawdowns in the reservoir could affect forage fish production and overwintering bull trout. To assess the impacts of

    Beulah Reservoir in southeastern Oregon provides irrigation water to nearby farms and supports an adfluvial population of threatened bull trout (Salvelinus confluentus). Summer drawdowns in the reservoir could affect forage fish production and overwintering bull trout. To assess the impacts of drawdown, we sampled fish, invertebrates, and water-quality variables seasonally during 2006-08. In 2006, the summer drawdown was about 68 percent of full pool, which was less than a typical drawdown of 85 percent. We detected few changes in pelagic invertebrate densities, and catch rates, abundance, and sizes of fish when comparing values from spring to values from fall. We did note that densities of benthic insects in areas that were dewatered annually were lower than those from areas that were not dewatered annually. In 2007, the drawdown was 100 percent (to run-of-river level) and resulted in decreases in abundance of invertebrates as much as 96 percent, decreases in catch rates of fish as much as 80 percent, decreases in abundance of redside shiners (Richardsonius balteatus) and northern pikeminnow (Ptychocheilus oregonensis) as much as 93 percent, and decreased numbers of small fish in catches. In the fall 2007, we estimated the total biomass of forage fish to be 76 kilograms, or about one-quarter of total biomass of forage fish in 2006. Bioenergetics modeling suggested that ample forage for about 1,000 bull trout would exist after a moderate drawdown, but that forage remaining after a complete dewatering would not be sufficient for a population one-fifth the size. Our results indicate that drawdowns in Beulah Reservoir affect the aquatic community and perhaps the health and well-being of bull trout. The severity of effects depends on the extent of drawdown, population size of bull trout, and perhaps other factors.

    خصائص المنتج:
    • الفئات: سياسة
    • غلاف الكتاب: غلاف عادي
    • لغة الكتاب: الانجليزية
    • الكاتب: Brien P. Rose, Matthew G. Mesa, United U. S. Department of the Interior
    • الناشر: Bibliogov
    • رقم ال ISBN: 9781288690244
    • عدد الصفحات: 68
    • لأبعاد (الارتفاع*العرض*العمق): 9.69 x 7.44 x 0.14 inches
 

تقييمات المستخدمين

0
لا يوجد تقييمات بعد
كن أول من يقيِّم هذا المنتج
قيِّم هذا المنتج:

إعلانات مُموَّلة لك

×

الرجاء تأكيد رقم هاتفك الجوال لإكمال عملية الشراء

سنقوم بإرسال رسالة نصية تحتوي على رمز التفعيل، الرجاء التأكد من رقم هاتفك الجوال ادناه، ثم انقر على زر "أرسل رمز التفعيل".