scholarly journals A critique of Mumby et al. 2011 “Grouper as a natural biocontrol of invasive lionfish”

2013 ◽  
Author(s):  
John F Bruno
Keyword(s):  
Study Design ◽  
Effect Size ◽  
Biotic Resistance ◽  
Negative Relationship ◽  
Sufficient Evidence ◽  
The Bahamas ◽  
Invasive Lionfish ◽  
Natural Range ◽  
The Caribbean

Mumby et al. (2011) tested the biotic resistance hypothesis by comparing the biomass of invasive lionfish (introduced from the Indo-Pacific) and native grouper (Serranidae) at 12 sites within and adjacent to the Exuma Cays Land and Sea Park, The Bahamas. They reported that mean lionfish biomass was slightly lower within the reserve, compared to adjacent fished sites, and that there was a negative relationship between the biomass of lionfish and grouper. However, their study has a number of limitations and does not constitute sufficient evidence of a level of biotic resistance that would be ecologically meaningful. For example, the study design is pseudoreplicated and the biomass of lionfish is extremely low relative to observed values across the Caribbean. Furthermore, the effect size (assuming that there is an effect of native grouper) is very small compared to the natural range of lionfish biomass. Given the problems with Mumby et al. (2011) and evidence from other studies (e.g., Hackerott et al. 2013) that the biomass of lionfish and grouper is unrelated, it seems clear that managers cannot rely on native grouper populations to control the lionfish invasion.

scholarly journals A critique of Mumby et al. 2011 “Grouper as a natural biocontrol of invasive lionfish”

2013 ◽  
Author(s):  
John F Bruno
Keyword(s):  
Study Design ◽  
Effect Size ◽  
Biotic Resistance ◽  
Negative Relationship ◽  
Sufficient Evidence ◽  
The Bahamas ◽  
Invasive Lionfish ◽  
Natural Range ◽  
The Caribbean

Mumby et al. (2011) tested the biotic resistance hypothesis by comparing the biomass of invasive lionfish (introduced from the Indo-Pacific) and native grouper (Serranidae) at 12 sites within and adjacent to the Exuma Cays Land and Sea Park, The Bahamas. They reported that mean lionfish biomass was slightly lower within the reserve, compared to adjacent fished sites, and that there was a negative relationship between the biomass of lionfish and grouper. However, their study has a number of limitations and does not constitute sufficient evidence of a level of biotic resistance that would be ecologically meaningful. For example, the study design is pseudoreplicated and the biomass of lionfish is extremely low relative to observed values across the Caribbean. Furthermore, the effect size (assuming that there is an effect of native grouper) is very small compared to the natural range of lionfish biomass. Given the problems with Mumby et al. (2011) and evidence from other studies (e.g., Hackerott et al. 2013) that the biomass of lionfish and grouper is unrelated, it seems clear that managers cannot rely on native grouper populations to control the lionfish invasion.

scholarly journals A critique of Mumby et al. 2011 “Grouper as a natural biocontrol of invasive lionfish”

2013 ◽  
Author(s):  
John F Bruno
Keyword(s):  
Study Design ◽  
Effect Size ◽  
Biotic Resistance ◽  
Negative Relationship ◽  
Sufficient Evidence ◽  
The Bahamas ◽  
Invasive Lionfish ◽  
Natural Range ◽  
The Caribbean

Mumby et al. (2011) tested the biotic resistance hypothesis by comparing the biomass of invasive lionfish (introduced from the Indo-Pacific) and native grouper (Serranidae) at 12 sites within and adjacent to the Exuma Cays Land and Sea Park, The Bahamas. They reported that mean lionfish biomass was slightly lower within the reserve, compared to adjacent fished sites, and that there was a negative relationship between the biomass of lionfish and grouper. However, their study has a number of limitations and does not constitute sufficient evidence of a level of biotic resistance that would be ecologically meaningful. For example, the study design is pseudoreplicated and the biomass of lionfish is extremely low relative to observed values across the Caribbean. Furthermore, the effect size (assuming that there is an effect of native grouper) is very small compared to the natural range of lionfish biomass. Given the problems with Mumby et al. (2011) and evidence from other studies (e.g., Hackerott et al. 2013) that the biomass of lionfish and grouper is unrelated, it seems clear that managers cannot rely on native grouper populations to control the lionfish invasion.

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.

Exploring power in response inhibition tasks using the bootstrap: The impact of number of participants, number of trials, effect magnitude, and study design

2019 ◽  
Author(s):  
Curtis David Von Gunten ◽  
Bruce D Bartholow
Keyword(s):  
Study Design ◽  
Effect Size ◽  
Statistical Power ◽  
Bootstrap Sampling ◽  
Reliable Measure ◽  
Internal Reliability ◽  
The Impact ◽  
Power Analyses ◽  
Effect Magnitude

A primary psychometric concern with laboratory-based inhibition tasks has been their reliability. However, a reliable measure may not be necessary or sufficient for reliably detecting effects (statistical power). The current study used a bootstrap sampling approach to systematically examine how the number of participants, the number of trials, the magnitude of an effect, and study design (between- vs. within-subject) jointly contribute to power in five commonly used inhibition tasks. The results demonstrate the shortcomings of relying solely on measurement reliability when determining the number of trials to use in an inhibition task: high internal reliability can be accompanied with low power and low reliability can be accompanied with high power. For instance, adding additional trials once sufficient reliability has been reached can result in large gains in power. The dissociation between reliability and power was particularly apparent in between-subject designs where the number of participants contributed greatly to power but little to reliability, and where the number of trials contributed greatly to reliability but only modestly (depending on the task) to power. For between-subject designs, the probability of detecting small-to-medium-sized effects with 150 participants (total) was generally less than 55%. However, effect size was positively associated with number of trials. Thus, researchers have some control over effect size and this needs to be considered when conducting power analyses using analytic methods that take such effect sizes as an argument. Results are discussed in the context of recent claims regarding the role of inhibition tasks in experimental and individual difference designs.

scholarly journals Twitter under Storm: Social Media Response Sensitization in the Caribbean

2020 ◽  
Author(s):  
Danilo T Perez-Rivera ◽  
Alexis Josué Martínez ◽  
Adriana Pons ◽  
Alejandro Rodríguez-Natal ◽  
Sergio Andrés Davila-Santana
Keyword(s):  
Social Media ◽  
Emergency Preparedness ◽  
Previous History ◽  
The Bahamas ◽  
Sea Levels ◽  
History Of ◽  
The Caribbean ◽  
Rising Sea Levels ◽  
Hurricane Exposure ◽  
Effective Design

Climate change has led to rising sea levels and warmer sea surface temperatures. These factors contribute greatly to the intensity of hurricanes and floods they provoke. Projections estimate there will be an increase of 45% to 87% in the frequency of Category >4 hurricanes originating in the Atlantic Basin, which typically impact the Caribbean and Continental United States of America. During the 2019 Hurricane Season, there were 20 depressions, 18 storms, 6 hurricanes and 3 major hurricanes. Through this work, we explored the response on Social Media to these natural phenomena as a function of their trajectory, intensity, and previous exposure of the population to intense natural disasters. Data was collected through the Twitter API. The influences of hurricane proximity and intensity on volume of Social Media production was explored. Hurricane Dorian, with its trajectory strongly threatening the previously exposed Puerto Rico, and eventually causing widespread damage in the Abaco Islands of the Bahamas, presented the strongest case for the evaluation of the dichotomy of responses between populations with differences in previous history of exposure. The landscape of historic hurricane exposure Caribbean has radically changed in recent years. Taking advantage of Big Data to help elucidate these dynamics could be instrumental in the tailoring of emergency preparedness plans and the effective design of mental health first aid strategies.

scholarly journals Eleocharis mutata (Cyperaceae), new to the flora of Florida, U.S.A.

2020 ◽  
Vol 14 (2) ◽  
pp. 405-410
Author(s):  
Courtney L. Angelo ◽  
David J. Rosen ◽  
James J. Lange
Keyword(s):  
Range Expansion ◽  
First Record ◽  
Caribbean Region ◽  
Visual Aids ◽  
Key To Species ◽  
Natural Range ◽  
The Caribbean ◽  
A Site ◽  
Eleocharis Mutata

This is the first record of Eleocharis mutata in Florida, and the second record in the continental USA, suggesting a potential natural range expansion of this species from the Caribbean region. A key to species of Eleocharis subg. Limnochloa in Florida is included, along with a site description of the occurrence, visual aids for identification, and a brief discussion of nativity.

Book Reviews

1994 ◽  
Vol 68 (1-2) ◽  
pp. 135-205
Author(s):  
Redactie KITLV
Keyword(s):  
New York ◽  
Cultural History ◽  
Economic History ◽  
West Indies ◽  
South Florida ◽  
The West ◽  
The Bahamas ◽  
University Of Florida ◽  
The People ◽  
The Caribbean

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