scholarly journals Spatial variation in allometric growth of invasive lionfish has management implications

2018 ◽  
Author(s):  
Juan Carlos Villaseñor-Derbez ◽  
Sean Fitzgerald
Keyword(s):  
Spatial Variation ◽  
Regional Differences ◽  
Growth Parameters ◽  
Ex Situ ◽  
Total Biomass ◽  
Allometric Growth ◽  
Management Implications ◽  
Western Atlantic ◽  
Invasive Lionfish ◽  
The Caribbean

Lionfish (Pterois volitans / miles) are an invasive species in the Western Atlantic and the Caribbean. Improving management of invasive lionfish populations requires accurate total biomass estimates, which depend on accurate estimates of allometric growth. Sedentary species like lionfish often exhibit high levels of spatial variation in life history characteristics. We review 17 published length-weight relationships for lionfish taken throughout their invasive range and found substantial regional differences in allometric growth parameters. The spatial pattern we observed is consistent with findings from other studies focusing on genetics or age-at-length. We show that the use of ex situ parameters can result in up to a threefold under- or overestimation of total weight, but using parameters from nearby regions reduces this error. These findings can have major implications for management in terms of predicting effects on local ecosystems, evaluating the effectiveness of removal programs, or estimating biomass available for harvest.

scholarly journals Spatial variation in allometric growth of invasive lionfish has management implications

2018 ◽  
Author(s):  
Juan Carlos Villaseñor-Derbez ◽  
Sean Fitzgerald
Keyword(s):  
Spatial Variation ◽  
Regional Differences ◽  
Growth Parameters ◽  
Ex Situ ◽  
Total Biomass ◽  
Allometric Growth ◽  
Management Implications ◽  
Western Atlantic ◽  
Invasive Lionfish ◽  
The Caribbean

Lionfish (Pterois volitans / miles) are an invasive species in the Western Atlantic and the Caribbean. Improving management of invasive lionfish populations requires accurate total biomass estimates, which depend on accurate estimates of allometric growth. Sedentary species like lionfish often exhibit high levels of spatial variation in life history characteristics. We review 17 published length-weight relationships for lionfish taken throughout their invasive range and found substantial regional differences in allometric growth parameters. The spatial pattern we observed is consistent with findings from other studies focusing on genetics or age-at-length. We show that the use of ex situ parameters can result in up to a threefold under- or overestimation of total weight, but using parameters from nearby regions reduces this error. These findings can have major implications for management in terms of predicting effects on local ecosystems, evaluating the effectiveness of removal programs, or estimating biomass available for harvest.

scholarly journals Spatial variation in allometric growth of invasive lionfish has management implications

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6667
Author(s):  
Juan Carlos Villaseñor-Derbez ◽  
Sean Fitzgerald
Keyword(s):  
Spatial Variation ◽  
Regional Differences ◽  
Ex Situ ◽  
Total Biomass ◽  
Allometric Growth ◽  
Western Atlantic ◽  
Individual Organism ◽  
Invasive Lionfish ◽  
The Caribbean ◽  
Parameter Values

Lionfish (Pterois volitans/miles) are an invasive species in the Western Atlantic and the Caribbean. Improving management of invasive lionfish populations requires accurate total biomass estimates, which depend on accurate estimates of allometric growth; sedentary species like lionfish often exhibit high levels of spatial variation in life history characteristics. We reviewed 17 published length-weight relationships for lionfish taken throughout their invasive range and found regional differences that led to significant misestimates when calculating weight from length observations. The spatial pattern we observed is consistent with findings from other studies focused on genetics or length-at-age. Here, the use of ex situ parameter values resulted in total biomass estimates between 76.2% and 140% of true observed biomass, and up to a threefold under- or overestimation of total weight for an individual organism. These findings can have implications for management in terms of predicting effects on local ecosystems, evaluating the effectiveness of removal programs, or estimating biomass available for harvest.

scholarly journals Spatial variation in allometric growth of invasive lionfish has management implications

2019 ◽  
Author(s):  
Juan Carlos Villaseñor-Derbez
Keyword(s):  
Spatial Variation ◽  
Regional Differences ◽  
Ex Situ ◽  
Total Biomass ◽  
Allometric Growth ◽  
Western Atlantic ◽  
Individual Organism ◽  
Invasive Lionfish ◽  
The Caribbean ◽  
Parameter Values

Lionfish (Pterois volitans/miles) are an invasive species in the Western Atlantic and the Caribbean. Improving management of invasive lionfish populations requires accurate total biomass estimates, which depend on accurate estimates of allometric growth; sedentary species like lionfish often exhibit high levels of spatial variation in life history characteristics. We reviewed 17 published length-weight relationships for lionfish taken throughout their invasive range and found regional differences that led to significant misestimates when calculating weight from length observations. The spatial pattern we observed is consistent with findings from other studies focused on genetics or length-at-age. Here, the use of ex situ parameter values resulted in total biomass estimates between 76.2% and 140% of true observed biomass, and up to a threefold under- or overestimation of total weight for an individual organism. These findings can have implications for management in terms of predicting effects on local ecosystems, evaluating the effectiveness of removal programs, or estimating biomass available for harvest.

scholarly journals On the relationship between native grouper and invasive lionfish in the Caribbean

2013 ◽  
Author(s):  
Peter J Mumby ◽  
Daniel R Brumbaugh ◽  
Alastair R Harborne ◽  
George Roff
Keyword(s):  
Invasive Species ◽  
Observational Data ◽  
Habitat Quality ◽  
Negative Relationship ◽  
Predatory Fish ◽  
Pterois Volitans ◽  
Western Atlantic ◽  
Invasive Lionfish ◽  
The Caribbean ◽  
The Relationship

The Indo-Pacific lionfish, Pterois volitans, has invaded most of the Tropical Western Atlantic in the last few years. The degree to which populations of this invasive species can be controlled by native predatory fish (mostly grouper), is controversial with conflicting reports. Here, we review the evidence of two recent papers and point out some of the difficulties in inferring predator-limitation purely from observational data. A negative relationship has been found between large-bodied grouper and lionfish during early colonisation though the degree to which this is caused by direct predation versus behavioural mechanisms is unclear. Evidence to the contrary from a recent study suffers confounding effects of habitat quality, fishing, and dispersal and therefore remains equivocal.

scholarly journals On the relationship between native grouper and invasive lionfish in the Caribbean

2013 ◽  
Author(s):  
Peter J Mumby ◽  
Daniel R Brumbaugh ◽  
Alastair R Harborne ◽  
George Roff
Keyword(s):  
Invasive Species ◽  
Observational Data ◽  
Habitat Quality ◽  
Negative Relationship ◽  
Predatory Fish ◽  
Pterois Volitans ◽  
Western Atlantic ◽  
Invasive Lionfish ◽  
The Caribbean ◽  
The Relationship

The Indo-Pacific lionfish, Pterois volitans, has invaded most of the Tropical Western Atlantic in the last few years. The degree to which populations of this invasive species can be controlled by native predatory fish (mostly grouper), is controversial with conflicting reports. Here, we review the evidence of two recent papers and point out some of the difficulties in inferring predator-limitation purely from observational data. A negative relationship has been found between large-bodied grouper and lionfish during early colonisation though the degree to which this is caused by direct predation versus behavioural mechanisms is unclear. Evidence to the contrary from a recent study suffers confounding effects of habitat quality, fishing, and dispersal and therefore remains equivocal.

scholarly journals Optimizing hydroponic culture media and NO3−/NH4+ ratio for improving essential oil compositions of purple coneflower (Echinacea purpurea L.)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fatemeh Ahmadi ◽  
Abbas Samadi ◽  
Ebrahim Sepehr ◽  
Amir Rahimi ◽  
Sergey Shabala
Keyword(s):  
Particle Size ◽  
Essential Oil ◽  
Plant Growth ◽  
Plant Height ◽  
Growth Parameters ◽  
Echinacea Purpurea ◽  
Peat Moss ◽  
Root Weight ◽  
Total Biomass ◽  
Growing Media

AbstractMedicinal plants represent a valuable commodity due to beneficial effects of their natural products on human health, prompting a need for finding a way to optimize/increase their production. In this study, a novel growing media with various perlite particle size and its mixture with peat moss was tested for hydroponic-based production of Echinacea purpurea medicinal plant under greenhouse conditions. The plant growth parameters such as plant height, total fresh leave weight, fresh root weight, total biomass, total chlorophyll, leaf area, and essential oil compositions were assessed. Perlite particle size in the growing media was varied from very coarse (more than 2 mm) to very fine (less than 0.5 mm), and the ratio between perlite and peat moss varied from 50:50 v/v to 30:70 v/v. In addition, two nitrate (NO3−) to ammonium (NH4+) ratios (90:10 and 70:30) were tested for each growing media. The medium containing very fine-grade perlite and 50:50 v/v perlite to peat moss ratio was found to be most optimal and beneficial for E. purpurea performance, resulting in maximal plant height, fresh and dry weight, leaf surface area, and chlorophyll content. It was also found that an increase in NO3−/NH4+ ratio caused a significant increase in plant growth parameters and increase the plant essential oil content. The major terpene hydrocarbons found in extract of E. purpurea with the best growth parameters were germacrene D (51%), myrcene (15%), α-pinene (12%), β-caryophyllene (11%), and 1-Pentadecene (4.4%), respectively. The percentages of these terpene hydrocarbons were increased by increasing of NO3−/NH4+ ratio. It can be concluded that decreasing the perlite particle size and increasing the NO3−/NH4+ ratio increased the plant growth parameters and essential oil compositions in E. purpurea.

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