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Tests Of Three Hypotheses Of Hatching Asynchrony In The Common Tern, Patricia B. Bollinger, Eric K. Bollinger, Richard A. Malecki
Tests Of Three Hypotheses Of Hatching Asynchrony In The Common Tern, Patricia B. Bollinger, Eric K. Bollinger, Richard A. Malecki
Eric K. Bollinger
We examined three hypotheses concerning hatching asynchrony in the Common Tern (Sterna hirundo). Survival of third-hatching "C-chicks" was significantly lower than that of "A-" and "B-chicks" in broods of three. In 2 yr when conditions did not appear favorable, survival was significantly higher in manipulated broods in which chicks hatched synchronously (73%) than in nonmanipulated broods (56%). Chicks in synchronous broods grew significantly faster than C-chicks and at a rate similar to A- and B-chicks. These results were inconsistent with the brood-reduction hypothesis, which predicts that hatching asynchrony will maximize brood success under conditions of food limitation. Chicks hatching from …
Achene Microstructure In Eriophorum L. (Cyperaceae): Systematic Implications And Paleobotanical Applications, Gordon C. Tucker, Norton G. Miller
Achene Microstructure In Eriophorum L. (Cyperaceae): Systematic Implications And Paleobotanical Applications, Gordon C. Tucker, Norton G. Miller
Gordon C. Tucker
Silica bodies in the outer cells of the achene epidermis in 17 species of Eriophorum-and nine species of Scirpus, some of which have been placed in Eriophorum, were revealed by sonication and/or acetolysis and examined by scanning electron microscopy. A silica body consists of a basal platform, one or more large elevated protuberances, and sometimes smaller satellite protuberances. Individual species differ in the number of protuberances, the presence/absence of satellites, the texture of the platform, and the occurrence of nodules on the larger protuberances. These features, combined with achene shape and characteristics of the anticlinal walls of the epidermal cells …
The Genera Of Arundinoideae (Gramineae) In The Southeastern United States, Gordon C. Tucker
The Genera Of Arundinoideae (Gramineae) In The Southeastern United States, Gordon C. Tucker
Gordon C. Tucker
No abstract provided.