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Articles 1 - 6 of 6
Full-Text Articles in Life Sciences
Ecosystem Metabolism In A Subtropical Seagrass-Dominated Lagoon, Susan Ziegler, Ronald Benner
Ecosystem Metabolism In A Subtropical Seagrass-Dominated Lagoon, Susan Ziegler, Ronald Benner
Faculty Publications
Measurements of ecosystem gross primary production (GPP) and respiration (R) were made for 2 to 3 consecutive days on 10 occasions from February 1996 through June 1997 in the seagrass-dominated Laguna Madre (Texas, USA). Ecosystem GPP and R were quantified using 3 independent measurements including the open-water technique using dissolved oxygen (DO) and dissolved inorganic carbon (DIC) and the summation of discrete measurements of the water column and benthos. Diel curves of DIC were often influenced by water movement while the impact of water movement on DO was not apparent. This was attributed to the longer turnover time of DIC …
Ecosystem Responses To Internal And Watershed Organic Matter Loading: Consequences For Hypoxia In The Eutrophying Neuse River Estuary, North Carolina, Usa, Hans W. Paerl, James L. Pinckney, John M. Fear, Benjamin L. Peierls
Ecosystem Responses To Internal And Watershed Organic Matter Loading: Consequences For Hypoxia In The Eutrophying Neuse River Estuary, North Carolina, Usa, Hans W. Paerl, James L. Pinckney, John M. Fear, Benjamin L. Peierls
Faculty Publications
The contrasting impacts of externally supplied (runoff) and internally generated (nutrient stimulated phytoplankton blooms) organic matter on oxygen (02) depletion were examined and evaluated in the eutrophic, salinity-stratified Neuse River Estuary, North Carolina, USA. This nitrogen (N)- limited estuary is experiencing increasing anthropogenic N loading from expanding urban, agricultural and industrial development in its watershed. Resultant algal blooms, which provided organic matter loads capable of causing extensive low 02 (hypoxic) and depleted 02 (anoxic) conditions, have induced widespread mortality of resident fin- and shellfish. Phytoplankton blooms followed periods of elevated N loading, except during extremely high …
Differential Expression Of The Arabidopsis Nia1 And Nia2 Genes: Cytokinin-Induced Nitrate Reductase Activity Is Correlated With Increased Nia1 Transcription And Mrna Levels, Xiaodan Yu, Sujatha Sukumaran, László Márton
Differential Expression Of The Arabidopsis Nia1 And Nia2 Genes: Cytokinin-Induced Nitrate Reductase Activity Is Correlated With Increased Nia1 Transcription And Mrna Levels, Xiaodan Yu, Sujatha Sukumaran, László Márton
Faculty Publications
Nitrate reductase (NR) activity increased up to 14-fold in response to treatment of Arabidopsis thaliana seedlings with the cytokinin benzyladenine. NR induction was observed in seedlings germinated directly on cytokinin-containing medium, seedlings transferred to cytokinin medium, and seedlings grown in soil in which cytokinin was applied directly to the leaves. About the same level of induction was seen in both wild-type and Nia2-deletion mutants, indicating that increased NR activity is related to the expression of the minor NR gene, Nia1. The steady-state Nia1 mRNA level was increased severalfold in both wild-type and mutant seedlings after benzyladenine treatment. Transcript …
Inter-And Intraspecific Interaction Rates Of Three Species Of Lemurs (Subfamily Lemurinae) In An Enclosure At The Memphis Zoo And Aquarium, Stephen J. Mullin
Inter-And Intraspecific Interaction Rates Of Three Species Of Lemurs (Subfamily Lemurinae) In An Enclosure At The Memphis Zoo And Aquarium, Stephen J. Mullin
Faculty Publications
The use of mixed-species exhibits in zoological parks may influence the types and rates of interactions between individuals housed in such enclosures. Inter-and intraspecific behavioral interactions were observed for three species of lemurs (ring-tailed lemur, Lemur catta; black lemur, Eulemur macaco macaco; and black-and-white ruffed leumur, Varecia variegata variegata; in an enclosure designed to simulate characteristics of their natural habitat. Intraspecific interactions occurred more frequently than interspecific interactions, and little aggression was observed, either between or within species. Intraspecific interactions among black lemurs increased with decreasing ambient temperature. Black lemurs performed more intraspecific mutual contacts than either agonistic behaviors or …
The Foraging Ecology Of The Gray Rat Snake (Elaphe Obsoleta Spiloides). Iii. Searching For Different Prey Types In Structurally Varied Habitats [Abstract], Stephen J. Mullin, Robert J. Cooper, William H. N. Gutzke
The Foraging Ecology Of The Gray Rat Snake (Elaphe Obsoleta Spiloides). Iii. Searching For Different Prey Types In Structurally Varied Habitats [Abstract], Stephen J. Mullin, Robert J. Cooper, William H. N. Gutzke
Faculty Publications
No abstract provided.
The Foraging Ecology Of The Gray Rat Snake (Elaphe Obsoleta Spiloides)-Visual Stimuli Facilitate Location Of Arboreal Prey, Robert J. Cooper, Stephen J. Mullin
The Foraging Ecology Of The Gray Rat Snake (Elaphe Obsoleta Spiloides)-Visual Stimuli Facilitate Location Of Arboreal Prey, Robert J. Cooper, Stephen J. Mullin
Faculty Publications
We examined the responsiveness of adult gray rat snakes to avian prey in enclosures that simulated natural habitat conditions. Subjects searched for arboreal nest contents in the presence or absence of a bird model flown so as to simulate avian provisioning behavior. In the absence of the model, gray rat snake latency to capture prey was over 92 % greater than when searching for nest contents with the model. Snakes responded to model flight by turning their heads in the direction of its movement. We conclude that gray rat snakes perceive relatively distant visual cues from prey, and that nest …