TAILIEUCHUNG - Entomology 3rd edition - C.Gillott - Chapter 16

16 Food Uptake and Utilization 1. Introduction Insects feed on a wide range of organic materials. About 75% of all species are phytophagous, and these form an important link in the transfer of energy from primary producers to second-order consumers. | 16 Food Uptake and Utilization 1. Introduction Insects feed on a wide range of organic materials. About 75 of all species are phytophagous and these form an important link in the transfer of energy from primary producers to second-order consumers. Others are carnivorous omnivorous or parasitic on other animals. In accord with the diversity of feeding habits the means by which insects locate their food the structure and physiology of their digestive system and their metabolism are highly varied. The feeding habits of insects take on special significance for humans on the one hand because of the enormous damage that feeding insects do to our food clothing and health and on the other because of the massive benefits that insects provide as plant pollinators during their search for food see also Chapter 24 . In addition because many species are easily and cheaply mass-cultured in the laboratory they have been used widely in research on digestion and absorption as well as in the elucidation of basic biochemical pathways the role of specific nutrients and other aspects of animal metabolism. 2. Food Selection and Feeding Distinct visual chemical and mechanical cues act at each step of the food location and ingestion process. These steps include attraction to food arrest of movement tasting biting further tasting as ingestion begins continued ingestion and termination of feeding. The sensitivity of the insect to these cues varies with its physiological state. For example a starved insect may become highly sensitive to odors or tastes associated with its normal food and in extreme cases may become quite indiscriminate in terms of what it ingests. On the other hand a female whose abdomen is full of eggs is normally uninterested in feeding. In some plant-feeding phytophagous species visual stimuli such as particular patterns especially stripes or colors may serve to initially attract an insect to a potential food source. Usually however the initial orientation where this .

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.