The relation between Tuljapurkar's and Caswell's equations describing population growth i... more The relation between Tuljapurkar's and Caswell's equations describing population growth in stochastic environments.
... To determine total seed production, every fruit produced was physically counted; only one see... more ... To determine total seed production, every fruit produced was physically counted; only one seed is produced per fruit (Tomlinson 1980 ... The elements of the elasticity matrix E a , e ij , are the proportional effects on population growth rate of proportional changes in each element of ...
... non-indigenous species. Examples include the Mascarene Islands (Lorence and Sussman 1986), th... more ... non-indigenous species. Examples include the Mascarene Islands (Lorence and Sussman 1986), the Mariana Islands (Craig 1993), and the Hawaiian Islands (Gerrish and Mueller-Dombois 1980). Extreme southern Florida ...
ABSTRACT The male of the Florida endemic bee species Hylaeus graenicheri is described from specim... more ABSTRACT The male of the Florida endemic bee species Hylaeus graenicheri is described from specimens collected in Everglades National Park, Florida. The male has genitalia typical of the subgenus Hylaeana. The species is noted for its small size, yellow and brown colour, and lack of a supraclypeal maculation and an incomplete clypeal maculation. Figures and photos are provided to help with identification.
ABSTRACT In the outer coastal plain of Georgia, USA, Gelsemium sempervirens (Gelsemiaceae) is hea... more ABSTRACT In the outer coastal plain of Georgia, USA, Gelsemium sempervirens (Gelsemiaceae) is heavily visited (69-100% of all flower visits) by male and female blueberry bees, Habropoda laboriosa (Hymenoptera-Apidae). Fruit set is, however, consistently low (8-36% range). The pollination efficiency of male and female blueberry bees was studied using: 1. comparison of pollen loads on foraging male and female bees; 2. calculation of pollen loads on fresh stigmas of flowers exposed to a single visit by a female bee; and 3. an experimental test of fruit and seed set following exposure to one to eight visits by both male and female bees. Females had larger pollen loads in four of five body regions, but male bees consistently carried pollen in quantities sufficient for fertilization. A single visit from a female bee resulted in mixed pollen deposition of 76 pollen grains, 20 of which were from Gelsemium and 56 from Vaccinium. There was no significant relationship of either fruit or seed set with number of visits from either males or females. Whilst both male and female bees are effective as pollen delivery agents of G. sempervirens, much of the pollen they deliver may be from the same floral morph, leading to rejection in this self-incompatible distylous species. Low fruit set may also be related to other factors such as resource limitation and / or herbivory.
The relation between Tuljapurkar's and Caswell's equations describing population growth i... more The relation between Tuljapurkar's and Caswell's equations describing population growth in stochastic environments.
... To determine total seed production, every fruit produced was physically counted; only one see... more ... To determine total seed production, every fruit produced was physically counted; only one seed is produced per fruit (Tomlinson 1980 ... The elements of the elasticity matrix E a , e ij , are the proportional effects on population growth rate of proportional changes in each element of ...
... non-indigenous species. Examples include the Mascarene Islands (Lorence and Sussman 1986), th... more ... non-indigenous species. Examples include the Mascarene Islands (Lorence and Sussman 1986), the Mariana Islands (Craig 1993), and the Hawaiian Islands (Gerrish and Mueller-Dombois 1980). Extreme southern Florida ...
ABSTRACT The male of the Florida endemic bee species Hylaeus graenicheri is described from specim... more ABSTRACT The male of the Florida endemic bee species Hylaeus graenicheri is described from specimens collected in Everglades National Park, Florida. The male has genitalia typical of the subgenus Hylaeana. The species is noted for its small size, yellow and brown colour, and lack of a supraclypeal maculation and an incomplete clypeal maculation. Figures and photos are provided to help with identification.
ABSTRACT In the outer coastal plain of Georgia, USA, Gelsemium sempervirens (Gelsemiaceae) is hea... more ABSTRACT In the outer coastal plain of Georgia, USA, Gelsemium sempervirens (Gelsemiaceae) is heavily visited (69-100% of all flower visits) by male and female blueberry bees, Habropoda laboriosa (Hymenoptera-Apidae). Fruit set is, however, consistently low (8-36% range). The pollination efficiency of male and female blueberry bees was studied using: 1. comparison of pollen loads on foraging male and female bees; 2. calculation of pollen loads on fresh stigmas of flowers exposed to a single visit by a female bee; and 3. an experimental test of fruit and seed set following exposure to one to eight visits by both male and female bees. Females had larger pollen loads in four of five body regions, but male bees consistently carried pollen in quantities sufficient for fertilization. A single visit from a female bee resulted in mixed pollen deposition of 76 pollen grains, 20 of which were from Gelsemium and 56 from Vaccinium. There was no significant relationship of either fruit or seed set with number of visits from either males or females. Whilst both male and female bees are effective as pollen delivery agents of G. sempervirens, much of the pollen they deliver may be from the same floral morph, leading to rejection in this self-incompatible distylous species. Low fruit set may also be related to other factors such as resource limitation and / or herbivory.
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