TAILIEUCHUNG - Insect Ecology - An Ecosystem Approach 2nd ed - Chapter 4

4 Resource Allocation INSECTS ALLOCATE ACQUIRED RESOURCES IN VARIOUS WAYS, DEPENDING on the energy and nutrient requirements of their physiological and behavioral processes. In addition to basic metabolism, foraging, growth, and reproduction, individual organisms also allocate resources. | 4 Resource Allocation I. Resource Budget II. Allocation of Assimilated Resources A. Resource Acquisition B. Mating Activity C. Reproductive and Social Behavior D. Competitive Defensive and Mutualistic Behavior III. Efficiency of Resource Use A. Factors Affecting Efficiency B. Tradeoffs IV. Summary INSECTS ALLOCATE ACQUIRED RESOURCES IN VARIOUS WAYS DEPENDING on the energy and nutrient requirements of their physiological and behavioral processes. In addition to basic metabolism foraging growth and reproduction individual organisms also allocate resources to pathways that influence their interactions with other organisms and abiotic nutrient pools Elser et al. 1996 . It is interesting that much of the early data on energy and nutrient allocation by insects was a byproduct of studies during 1950 to 1970 on anticipated effects of nuclear war on radioisotope movement through ecosystems . Crossley and Howden 1961 Crossley and Witkamp 1964 . Research also addressed effects of radioactive fallout on organisms that affect human health and food supply. Radiation effects on insects and other arthropods were perceived to be of special concern because of the recognized importance of these organisms to human health and crop production. Radioactive isotopes such as 31P 137Cs assimilated and allocated as is K and 85Sr assimilated and allocated as is Ca became useful tools for tracking the assimilation and allocation of nutrients through organisms food webs and ecosystems. I. RESOURCE BUDGET The energy or nutrient budget of an individual can be expressed by the equation I P R E in which I consumption P production R respiration E egestion and I -E P R assimilation. Energy is required to fuel metabolism so only part of the assimilated energy is available for growth and reproduction Fig. . The remainder is lost through respiration. Insects and other heterotherms require little energy to maintain thermal homeostasis. Hence arthropods generally 95 96 4. RESOURCE ALLOCATION Growth

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.