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Articles 1 - 8 of 8
Full-Text Articles in Life Sciences
The Effects Of Site Quality On Breeding-Site Fidelity In Bobolinks, Eric K. Bollinger, Thomas A. Gavin
The Effects Of Site Quality On Breeding-Site Fidelity In Bobolinks, Eric K. Bollinger, Thomas A. Gavin
Eric K. Bollinger
We compared breeding-site fidelity of Bobolinks (Dolichonyx oryzivorus) at two low-quality sites (Bald Hill and Shackelton Point, BH +SP) with that at one high-quality site (Moore Road, MR) in central New York. Yearly density of fledglings at Moore Road was more than six times the density at Bald Hill and Shackelton Point. Furthermore, individual residents fledged 50-70% more young at the high-quality site. At Moore Road, 70% of the males and 49% of the females returned one or more times, compared with 44% of the males and 25% of the females at the low-quality sites. Successful residents (i.e. those fledging …
Amino Acid Uptake And Metabolism By Larvae Of The Marine Worm Urechis Caupo (Echiura), A New Species In Axenic Culture, William Jaeckle, Donal T. Manahan
Amino Acid Uptake And Metabolism By Larvae Of The Marine Worm Urechis Caupo (Echiura), A New Species In Axenic Culture, William Jaeckle, Donal T. Manahan
William Jaeckle
Axenic (bacteria-free) larval cultures of the marine echiuran worm, Urechis caupo, were reliably obtained by aseptically removing gametes directly from the gamete storage organs. Trochophore larvae only removed neutral amino acids from seawater as measured by high-performance liquid chromatography (HPLC). There was no detectable uptake, as measured by HPLC, of acidic or basic amino acids. Kinetic analysis showed that the transport system for alanine in 4-day-old larvae had a Kt of 4-6 μM and a Jmax of 9-10 pmol larva-1 h-1. Following a 50-min exposure, the majority of the radio-activity (95%) from 14C-alanine was found in the trichlo-roacetic acid-soluble fraction. …
Genetic Variability Within And Among Wintering Populations Of Brant, James M. Novak, L. M. Smith, L. D. Vangilder
Genetic Variability Within And Among Wintering Populations Of Brant, James M. Novak, L. M. Smith, L. D. Vangilder
James M. Novak
No abstract provided.
The Genera Of Commelinaceae In The Southeastern United States, Gordon C. Tucker
The Genera Of Commelinaceae In The Southeastern United States, Gordon C. Tucker
Gordon C. Tucker
No abstract provided.
Ontogenic Changes In The Rates Of Amino Acid Transport From Seawater By Marine Invertebrate Larvae (Echinodermata, Echiura, Mollusca), Donal Manahan, William Jaeckle, Saeid Nourizadeh
Ontogenic Changes In The Rates Of Amino Acid Transport From Seawater By Marine Invertebrate Larvae (Echinodermata, Echiura, Mollusca), Donal Manahan, William Jaeckle, Saeid Nourizadeh
William Jaeckle
Transport rates of amino acids were determined for larvae of different ages of the echiuran worm Urechis caupo, the gastropod Haliotis rufescens, the bivalve Crassostrea gigas, and the sea urchin Strongylocentrotus purpuratus. All larval forms showed an increase in the transport rate of amino acids during development. Trochophores of U. caupo increased their rate of net flux for each of 5 amino acids (100 nM each) by a factor of 1.6 and 2.2 during 1-3 days and 4-8 days, respectively, for two independent cultures. In H. rufescens, the maximum transport capacity (Jmax) for alanine increased 3-fold during the 24 h …
(Editor) Plant-Animal Interactions (Textbook), Warren Abrahamson
(Editor) Plant-Animal Interactions (Textbook), Warren Abrahamson
Warren G. Abrahamson, II
No abstract provided.
Feeding By A “Nonfeeding” Larva: Uptake Of Dissolved Amino Acids From Seawater By Licithotrophic Larvae Of The Gastropod Haliotis Refescens, William Jaeckle
Feeding By A “Nonfeeding” Larva: Uptake Of Dissolved Amino Acids From Seawater By Licithotrophic Larvae Of The Gastropod Haliotis Refescens, William Jaeckle
William Jaeckle
No abstract provided.
Growth And Energy Imbalance During The Development Of A Lecithotrophic Molluscan Larva (Haliotis Rufescens), William Jaeckle, Donal T. Manahan
Growth And Energy Imbalance During The Development Of A Lecithotrophic Molluscan Larva (Haliotis Rufescens), William Jaeckle, Donal T. Manahan
William Jaeckle
Larvae of the gastropod Haliotis rufescens are classified as "nonfeeding" because they cannot capture particular foods. However, for only 1 out of 5 independent cultures was a net decrease observed in dry organic weight during the complete period of larval development (5 to 7 days). In fact, there were net increases in dry organic weight from the oocyte (day 0) to the newly formed veliger larvae (2-day-old). These weight increases during early development could be explained by increases in the amounts of specific biochemical components of the larvae, relative to oocytes. The metabolic rates of larvae were measured (oxygen consumption) …