Megan La Peyre, PhD (Former Employee)
Science and Products
Filter Total Items: 94
Using Gambusia affinis growth and condition to assess estuarine habitat quality: A comparison of indices Using Gambusia affinis growth and condition to assess estuarine habitat quality: A comparison of indices
Numerous indices have been used to estimate fish growth and condition however, differences in sensitivity and reliability of the methods have hampered efforts to identify appropriate indicators for routine evaluation of habitat quality in the field. We compared common morphometric (length, weight, somatic growth, length-weight condition) and biochemical (RNA:DNA ratio, relative DNA...
Authors
Bryan P. Piazza, M.K. La Peyre
Evaluating ecological equivalence of created marshes: comparing structural indicators with stable isotope indicators of blue crab trophic support Evaluating ecological equivalence of created marshes: comparing structural indicators with stable isotope indicators of blue crab trophic support
This study sought to examine ecological equivalence of created marshes of different ages using traditional structural measures of equivalence, and tested a relatively novel approach using stable isotopes as a measure of functional equivalence. We compared soil properties, vegetation, nekton communities, and δ13C and δ15N isotope values of blue crab muscle and hepatopancreas tissue and...
Authors
Chris Llewellyn, Megan K. LaPeyre
Defining restoration targets for water depth and salinity in wind-dominated Spartina patens (Ait.) Muhl. coastal marshes Defining restoration targets for water depth and salinity in wind-dominated Spartina patens (Ait.) Muhl. coastal marshes
Coastal wetlands provide valued ecosystem functions but the sustainability of those functions often is threatened by artificial hydrologic conditions. It is widely recognized that increased flooding and salinity can stress emergent plants, but there are few measurements to guide restoration, management, and mitigation. Marsh flooding can be estimated over large areas with few data where...
Authors
J.A. Nyman, Megan K. LaPeyre, Andral W. Caldwell, Sarai C. Piazza, C. Thom, C. Winslow
Defining optimal freshwater flow for oyster production: effects of freshet rate and magnitude of change and duration on eastern oysters and Perkinsus marinus infection Defining optimal freshwater flow for oyster production: effects of freshet rate and magnitude of change and duration on eastern oysters and Perkinsus marinus infection
In coastal Louisiana, the development of large-scale freshwater diversion projects has led to controversy over their effects on oyster resources. Using controlled laboratory experiments in combination with a field study, we examined the effects of pulsed freshwater events (freshet) of different magnitude, duration, and rate of change on oyster resources. Laboratory and field evidence...
Authors
Megan K. LaPeyre, B. Gossman, Jerome F. La Peyre
Short- and long-term response of deteriorating brackish marshes and open-water ponds to sediment enhancement by thin-layer dredge disposal Short- and long-term response of deteriorating brackish marshes and open-water ponds to sediment enhancement by thin-layer dredge disposal
Artificial sediment enhancement using a thin layer of dredged material has been suggested as a means to increase elevation and create soil conditions conducive to increased marsh structure and function in deteriorating marshes. Using a chronosequence approach, we examined the effects of sediment enhancement in deteriorating marsh and open-water pond habitats located in six brackish...
Authors
M.K. La Peyre, B. Gossman, Bryan P. Piazza
The effect of Hurricane Katrina on nekton communities in the tidal freshwater marshes of Breton Sound, Louisiana, USA The effect of Hurricane Katrina on nekton communities in the tidal freshwater marshes of Breton Sound, Louisiana, USA
Hurricanes are climatically-induced resource pulses that affect community structure through the combination of physical and chemical habitat change. Estuaries are susceptible to hurricane pulses and are thought to be resilient to habitat change, because biotic communities often return quickly to pre-hurricane conditions. Although several examples provide evidence of quick recovery of...
Authors
Bryan P. Piazza, M.K. La Peyre
By
Assessing functional equivalency of nekton habitat in enhanced habitats: Comparison of terraced and unterraced marsh ponds Assessing functional equivalency of nekton habitat in enhanced habitats: Comparison of terraced and unterraced marsh ponds
A primary goal of many coastal restoration programs is to increase nekton habitat in terms of both quantity and quality. Using shallow water ponds rehabilitated with a technique called marsh terracing, we examined the quality of nekton habitat created, using and comparing several metrics including nekton density and diversity, functional group composition, and weight-length relationships...
Authors
M.K. La Peyre, B. Gossman, J.A. Nyman
Salinity effects on viability, metabolic activity and proliferation of three Perkinsus species Salinity effects on viability, metabolic activity and proliferation of three Perkinsus species
Little is known regarding the range of conditions in which many Perkinsus species may proliferate, making it difficult to predict conditions favorable for their expansion, to identify conditions inducing mortality, or to identify instances of potential cross-infectivity among sympatric host species. In this study, the effects of salinity on viability, metabolic activity and proliferation...
Authors
Peyre M. La, S. Casas, Peyre J. La
Oyster beds as fish and macroinvertebrate habitat in Barataria Bay, Louisiana Oyster beds as fish and macroinvertebrate habitat in Barataria Bay, Louisiana
[No abstract available]
Authors
J. Plunket, M.K. La Peyre
Identifying determinants of nations' wetland management programs using structural equation modeling: An exploratory analysis Identifying determinants of nations' wetland management programs using structural equation modeling: An exploratory analysis
Integrated management and policy models suggest that solutions to environmental issues may be linked to the socioeconomic and political Characteristics of a nation. In this study, we empirically explore these suggestions by applying them to the wetland management activities of nations. Structural equation modeling was used to evaluate a model of national wetland management effort and one...
Authors
M.K. La Peyre, I.A. Mendelssohn, M.A. Reams, P.H. Templet, J.B. Grace
Science and Products
Filter Total Items: 94
Using Gambusia affinis growth and condition to assess estuarine habitat quality: A comparison of indices Using Gambusia affinis growth and condition to assess estuarine habitat quality: A comparison of indices
Numerous indices have been used to estimate fish growth and condition however, differences in sensitivity and reliability of the methods have hampered efforts to identify appropriate indicators for routine evaluation of habitat quality in the field. We compared common morphometric (length, weight, somatic growth, length-weight condition) and biochemical (RNA:DNA ratio, relative DNA...
Authors
Bryan P. Piazza, M.K. La Peyre
Evaluating ecological equivalence of created marshes: comparing structural indicators with stable isotope indicators of blue crab trophic support Evaluating ecological equivalence of created marshes: comparing structural indicators with stable isotope indicators of blue crab trophic support
This study sought to examine ecological equivalence of created marshes of different ages using traditional structural measures of equivalence, and tested a relatively novel approach using stable isotopes as a measure of functional equivalence. We compared soil properties, vegetation, nekton communities, and δ13C and δ15N isotope values of blue crab muscle and hepatopancreas tissue and...
Authors
Chris Llewellyn, Megan K. LaPeyre
Defining restoration targets for water depth and salinity in wind-dominated Spartina patens (Ait.) Muhl. coastal marshes Defining restoration targets for water depth and salinity in wind-dominated Spartina patens (Ait.) Muhl. coastal marshes
Coastal wetlands provide valued ecosystem functions but the sustainability of those functions often is threatened by artificial hydrologic conditions. It is widely recognized that increased flooding and salinity can stress emergent plants, but there are few measurements to guide restoration, management, and mitigation. Marsh flooding can be estimated over large areas with few data where...
Authors
J.A. Nyman, Megan K. LaPeyre, Andral W. Caldwell, Sarai C. Piazza, C. Thom, C. Winslow
Defining optimal freshwater flow for oyster production: effects of freshet rate and magnitude of change and duration on eastern oysters and Perkinsus marinus infection Defining optimal freshwater flow for oyster production: effects of freshet rate and magnitude of change and duration on eastern oysters and Perkinsus marinus infection
In coastal Louisiana, the development of large-scale freshwater diversion projects has led to controversy over their effects on oyster resources. Using controlled laboratory experiments in combination with a field study, we examined the effects of pulsed freshwater events (freshet) of different magnitude, duration, and rate of change on oyster resources. Laboratory and field evidence...
Authors
Megan K. LaPeyre, B. Gossman, Jerome F. La Peyre
Short- and long-term response of deteriorating brackish marshes and open-water ponds to sediment enhancement by thin-layer dredge disposal Short- and long-term response of deteriorating brackish marshes and open-water ponds to sediment enhancement by thin-layer dredge disposal
Artificial sediment enhancement using a thin layer of dredged material has been suggested as a means to increase elevation and create soil conditions conducive to increased marsh structure and function in deteriorating marshes. Using a chronosequence approach, we examined the effects of sediment enhancement in deteriorating marsh and open-water pond habitats located in six brackish...
Authors
M.K. La Peyre, B. Gossman, Bryan P. Piazza
The effect of Hurricane Katrina on nekton communities in the tidal freshwater marshes of Breton Sound, Louisiana, USA The effect of Hurricane Katrina on nekton communities in the tidal freshwater marshes of Breton Sound, Louisiana, USA
Hurricanes are climatically-induced resource pulses that affect community structure through the combination of physical and chemical habitat change. Estuaries are susceptible to hurricane pulses and are thought to be resilient to habitat change, because biotic communities often return quickly to pre-hurricane conditions. Although several examples provide evidence of quick recovery of...
Authors
Bryan P. Piazza, M.K. La Peyre
By
Assessing functional equivalency of nekton habitat in enhanced habitats: Comparison of terraced and unterraced marsh ponds Assessing functional equivalency of nekton habitat in enhanced habitats: Comparison of terraced and unterraced marsh ponds
A primary goal of many coastal restoration programs is to increase nekton habitat in terms of both quantity and quality. Using shallow water ponds rehabilitated with a technique called marsh terracing, we examined the quality of nekton habitat created, using and comparing several metrics including nekton density and diversity, functional group composition, and weight-length relationships...
Authors
M.K. La Peyre, B. Gossman, J.A. Nyman
Salinity effects on viability, metabolic activity and proliferation of three Perkinsus species Salinity effects on viability, metabolic activity and proliferation of three Perkinsus species
Little is known regarding the range of conditions in which many Perkinsus species may proliferate, making it difficult to predict conditions favorable for their expansion, to identify conditions inducing mortality, or to identify instances of potential cross-infectivity among sympatric host species. In this study, the effects of salinity on viability, metabolic activity and proliferation...
Authors
Peyre M. La, S. Casas, Peyre J. La
Oyster beds as fish and macroinvertebrate habitat in Barataria Bay, Louisiana Oyster beds as fish and macroinvertebrate habitat in Barataria Bay, Louisiana
[No abstract available]
Authors
J. Plunket, M.K. La Peyre
Identifying determinants of nations' wetland management programs using structural equation modeling: An exploratory analysis Identifying determinants of nations' wetland management programs using structural equation modeling: An exploratory analysis
Integrated management and policy models suggest that solutions to environmental issues may be linked to the socioeconomic and political Characteristics of a nation. In this study, we empirically explore these suggestions by applying them to the wetland management activities of nations. Structural equation modeling was used to evaluate a model of national wetland management effort and one...
Authors
M.K. La Peyre, I.A. Mendelssohn, M.A. Reams, P.H. Templet, J.B. Grace