The Importance of Timing the Application of Chemosterilization in Red-winged Blackbird
نویسندگان
چکیده
To evaluate the importance of the timing of an application of a chemosterilant, we measured the effect of Ornitrol on testis size and maturation of sperm cells at different time periods during testis growth and in two different breeding seasons. Indoor experiments showed that Ornitrol did not affect testes nor sperm cells when applied at the onset of testes growth. but did have an effect when applied the 4th week afterwards. Field experiments showed much variation in Ornitrol treatment efficiency between years. Timing of application in relation to testes growth is believed to be of major importance in using chemosterilization as a management tool for red-winged blackbird population control.
منابع مشابه
Habitat suitability modeling of red-winged pratincole (Glareola pratincola) in Shadegan International Wetlands
The Survey of the ecological characteristics of the species and determining their habitat suitability is one of the main principles of management and conservation of wildlife species. Hence, we need methods that can help assess habitats and can estimate, over time, reduce of their quality. To understand the effects of human activities and the changes of a habitat, it is necessary to make quanti...
متن کاملHabitat suitability modeling of red-winged pratincole (Glareola pratincola) in Shadegan International Wetlands
The Survey of the ecological characteristics of the species and determining their habitat suitability is one of the main principles of management and conservation of wildlife species. Hence, we need methods that can help assess habitats and can estimate, over time, reduce of their quality. To understand the effects of human activities and the changes of a habitat, it is necessary to make quanti...
متن کاملApplication of an Avian Bioenergetics Simulation Model to Red-winged Blackbird - Crop Relations
متن کامل
Comparative toxicity of seventeen pesticides to the Quelea, house sparrow, and red-winged blackbird.
Comparative Toxicity of Seventeen Pesticides to the Quelea, House Sparrow, and Red-Winged Blackbird. SCHAFER, E. W., JR., BRUNTON, R. B., LOCKYER, N. F. AND DE GRAZIO, J. W. (1973). Toxicol. Appl. Phurmacol. 26, 154-157. The acute po LD5,, values of 17 commercial or experimental pesticides were determined for quelea (Quelea quelea), house sparrows (Passer domesticus), and red-winged blackbirds ...
متن کاملDecline of the Red-winged Blackbird Population in Ohio Correlated to Changes in Agriculture (1965-1996)
Based on North American Breeding Bird Survey (BBS) data since 1966, Ohio has traditionally hosted 1 of the highest breeding season densities of red-winged blackbirds (Agelnius phoeniceus) of any U.S. state or Canadian province. However, from 1966 through 1996, breeding populations of red-winged blackbirds in Ohio showed a marked decline ( Z % change/yr in birds per route = -3.9), with breeding ...
متن کامل