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Articles 1 - 6 of 6
Full-Text Articles in Entire DC Network
Grooming As A Secondary Behavior In The Shrimp Macrobrachium Rosenbergii (Crustacea, Decapoda, Caridea), Lauren N. Vanmaurik, Jennifer L. Wortham
Grooming As A Secondary Behavior In The Shrimp Macrobrachium Rosenbergii (Crustacea, Decapoda, Caridea), Lauren N. Vanmaurik, Jennifer L. Wortham
Integrative Biology Faculty and Staff Publications
The giant freshwater prawn, Macrobrachium rosenbergii, is a large shrimp extensively used in aquaculture whose grooming behaviors were analyzed in this study. Macrobrachium rosenbergii exhibits three unique male morphotypes that differ in their behavior, morphology and physiology: small-clawed males (SM), orange-clawed males (OC) and blue-clawed males (BC). The largest and most dominant males, BC males, are predicted to have significantly different grooming behaviors compared to females and the other two male morphotypes. These BC males may be too large and bulky to efficiently groom and may dedicate more time to mating and agonistic interactions than grooming behaviors. Observations were …
Life History And Demographic Drivers Of Reservoir Competence For Three Tick-Borne Zoonotic Pathogens, Richard S. Ostfeld, Taal Levi, Anna E. Jolles, Lynn B. Martin, Parviez R. Hosseini, Felicia Keesing
Life History And Demographic Drivers Of Reservoir Competence For Three Tick-Borne Zoonotic Pathogens, Richard S. Ostfeld, Taal Levi, Anna E. Jolles, Lynn B. Martin, Parviez R. Hosseini, Felicia Keesing
Integrative Biology Faculty and Staff Publications
Animal and plant species differ dramatically in their quality as hosts for multi-host pathogens, but the causes of this variation are poorly understood. A group of small mammals, including small rodents and shrews, are among the most competent natural reservoirs for three tick-borne zoonotic pathogens, Borrelia burgdorferi, Babesia microti, and Anaplasma phagocytophilum, in eastern North America. For a group of nine commonly-infected mammals spanning >2 orders of magnitude in body mass, we asked whether life history features or surrogates for (unknown) encounter rates with ticks, predicted reservoir competence for each pathogen. Life history features associated with a fast pace …
Experimental Evolution Alters The Rate And Temporal Pattern Of Population Growth In Batrachochytrium Dendrobatidis, A Lethal Fungal Pathogen Of Amphibians, Jamie Voyles, Leah R. Johnson, Cheryl J. Briggs, Scott D. Cashins, Ross A. Alford, Lee Berger, Lee F. Skerratt, Rick Speare, Erica Bree Rosenblum
Experimental Evolution Alters The Rate And Temporal Pattern Of Population Growth In Batrachochytrium Dendrobatidis, A Lethal Fungal Pathogen Of Amphibians, Jamie Voyles, Leah R. Johnson, Cheryl J. Briggs, Scott D. Cashins, Ross A. Alford, Lee Berger, Lee F. Skerratt, Rick Speare, Erica Bree Rosenblum
Integrative Biology Faculty and Staff Publications
Virulence of infectious pathogens can be unstable and evolve rapidly depending on the evolutionary dynamics of the organism. Experimental evolution can be used to characterize pathogen evolution, often with the underlying objective of understanding evolution of virulence. We used experimental evolution techniques (serial transfer experiments) to investigate differential growth and virulence of Batrachochytrium dendrobatidis (Bd), a fungal pathogen that causes amphibian chytridiomycosis. We tested two lineages of Bd that were derived from a single cryo-archived isolate; one lineage (P10) was passaged 10 times, whereas the second lineage (P50) was passaged 50 times. We quantified time to …
Nitrogen Inputs And Losses In Response To Chronic Co2 Exposure In A Subtropical Oak Woodland, B. A. Hungate, B. D. Duval, P. Dijkstra, D. W. Johnson, M. E. Ketterer, Peter Stiling, W. Cheng, J. Millman, A. Hartley, D. B. Stover
Nitrogen Inputs And Losses In Response To Chronic Co2 Exposure In A Subtropical Oak Woodland, B. A. Hungate, B. D. Duval, P. Dijkstra, D. W. Johnson, M. E. Ketterer, Peter Stiling, W. Cheng, J. Millman, A. Hartley, D. B. Stover
Integrative Biology Faculty and Staff Publications
Rising atmospheric CO2 concentrations may alter the nitrogen (N) content of ecosystems by changing N inputs and N losses, but responses vary in field experiments, possibly because multiple mechanisms are at play. We measured N fixation and N losses in a subtropical oak woodland exposed to 11 years of elevated atmospheric CO2 concentrations. We also explored the role of herbivory, carbon limitation, and competition for light or nutrients in shaping the response of N fixation to elevated CO2. Elevated CO2 did not significantly alter gaseous N losses, but lower recovery and deeper distribution in the …
Time To Competitive Exclusion, Andrew M. Kramer, John M. Drake
Time To Competitive Exclusion, Andrew M. Kramer, John M. Drake
Integrative Biology Faculty and Staff Publications
A predictive theory of population extinction for natural populations requires integrating the effects of stochasticity with the interactions engaged in with populations of other species. The theory of competitive exclusion predicts that inferior competitors for a limiting resource will be driven to extinction, but the effects of resource competition on time to extinction have not been examined. We studied a stochastic version of Tilman's resource competition model to examine two species competition-driven extinction. Simulations showed that competitive imbalance, population size and demographic rates of the “inferior” competitor were the most important determinants of mean extinction time, while factors including resource …
Assessing The In Situ Fertilization Status Of Two Marine Copepod Species, Temora Longicornis And Eurytemora Herdmani; How Common Are Unfertilized Eggs In Nature?, Rachel S. Lasley-Rasher, Andrew M. Kramer, Victoria Burdett-Coutts, Jeannette Yen
Assessing The In Situ Fertilization Status Of Two Marine Copepod Species, Temora Longicornis And Eurytemora Herdmani; How Common Are Unfertilized Eggs In Nature?, Rachel S. Lasley-Rasher, Andrew M. Kramer, Victoria Burdett-Coutts, Jeannette Yen
Integrative Biology Faculty and Staff Publications
We utilized an egg staining technique to measure the in situ fertilization success of two marine copepod species, Temora longicornis and Eurytemora herdmani from May to October 2008 in coastal Maine and correlated fertilization success with environmental conditions in their habitat. T. longicornis is a free spawning species that releases eggs into the ambient seawater after mating. In contrast, E. herdmani carries eggs in an egg sac until they hatch. The proportion of fertilized eggs within E. herdmani egg sacs was significantly higher than the freely spawned clutches of T. longicornis. This may be a result of the asymmetrical costs …