Circannual rhythm of torpor and molt in the ground squirrel, spermophilus beecheyi

Exhibition of circannual rhythm under constant light in the varied carpet beetleAnthrenus verbasci

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Exhibition of circannual rhythm under constant light in the varied carpet beetleAnthrenus verbasci

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Circannual changes in nesting behavior of captive ground squirrels(Spermophilus beecheyi)

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Laboratory Evaluation of Fipronil and Imidacloprid Topical Insecticides for Control of the Plague VectorOropsylla montana(Siphonaptera: Ceratophyllidae) on California Ground Squirrels (Rodentia: Sciuridae)

“…This was tied closely with hair loss from the spring molt, which spanned several weeks. The spring molt is regulated by a circannual rhythm and generally occurs between March and June in both wild and captive animals (Davis and Swade 1983). Although not as dramatic, squirrels #2 and #3 began molting at Ϸ16 and 20 wk after treatment, respectively, suggesting that loss of toxicity against O. montana might be tied to hair loss of the animal.…”

“…Table 3 summarizes calculations of estimated skin and hair surface area available to insecticide movement on treated squirrels as well as one cat and one dog for comparison. Laboratory squirrel weights ßuctuated dramatically during the year due to circannual cycles that continue to run even under constant laboratory conditions (Davis and Swade 1983). However, the weights recorded for surface area calculations (445Ð 687 g) were taken at the beginning of the insecticide treatments and should have provided an approximate surface area available at the time of insecticide application.…”

Exhibition of circannual rhythm under constant light in the varied carpet beetleAnthrenus verbasci

“……”

Circannual changes in nesting behavior of captive ground squirrels(Spermophilus beecheyi)

“……”

Laboratory Evaluation of Fipronil and Imidacloprid Topical Insecticides for Control of the Plague VectorOropsylla montana(Siphonaptera: Ceratophyllidae) on California Ground Squirrels (Rodentia: Sciuridae)

“…This was tied closely with hair loss from the spring molt, which spanned several weeks. The spring molt is regulated by a circannual rhythm and generally occurs between March and June in both wild and captive animals (Davis and Swade 1983). Although not as dramatic, squirrels #2 and #3 began molting at Ϸ16 and 20 wk after treatment, respectively, suggesting that loss of toxicity against O. montana might be tied to hair loss of the animal.…”

“…Table 3 summarizes calculations of estimated skin and hair surface area available to insecticide movement on treated squirrels as well as one cat and one dog for comparison. Laboratory squirrel weights ßuctuated dramatically during the year due to circannual cycles that continue to run even under constant laboratory conditions (Davis and Swade 1983). However, the weights recorded for surface area calculations (445Ð 687 g) were taken at the beginning of the insecticide treatments and should have provided an approximate surface area available at the time of insecticide application.…”

Exhibition of circannual rhythm under constant light in the varied carpet beetleAnthrenus verbasci

“……”

Circannual changes in nesting behavior of captive ground squirrels(Spermophilus beecheyi)

“……”

Laboratory Evaluation of Fipronil and Imidacloprid Topical Insecticides for Control of the Plague VectorOropsylla montana(Siphonaptera: Ceratophyllidae) on California Ground Squirrels (Rodentia: Sciuridae)

“…This was tied closely with hair loss from the spring molt, which spanned several weeks. The spring molt is regulated by a circannual rhythm and generally occurs between March and June in both wild and captive animals (Davis and Swade 1983). Although not as dramatic, squirrels #2 and #3 began molting at Ϸ16 and 20 wk after treatment, respectively, suggesting that loss of toxicity against O. montana might be tied to hair loss of the animal.…”

“…Table 3 summarizes calculations of estimated skin and hair surface area available to insecticide movement on treated squirrels as well as one cat and one dog for comparison. Laboratory squirrel weights ßuctuated dramatically during the year due to circannual cycles that continue to run even under constant laboratory conditions (Davis and Swade 1983). However, the weights recorded for surface area calculations (445Ð 687 g) were taken at the beginning of the insecticide treatments and should have provided an approximate surface area available at the time of insecticide application.…”