Patterns of success in game bird introductions in the United States

Moulton, Michael P.; Cropper, Wendell P.; Broz, Andrew J; Gezan, Salvador A.

doi:10.1007/s10531-017-1475-9

Cited by 4 publications

(10 citation statements)

References 42 publications

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“…We have inferred from prior analyses (Moulton et al, 2018) that significant differences exist across taxonomic groups. The data here are too limited for proper tests of many species level effects, again due to the above mentioned aggregation problems.…”

Section: Resultsmentioning

confidence: 99%

“…The popularity of this perspective has advanced despite numerous studies that show equally important roles for location-level factors (Moulton & Cropper, 2014a; Moulton et al, 2018; Redding et al, 2019) and species-level factors (Blackburn, Cassey & Lockwood, 2009b; Sol et al, 2005, 2012; Cassey, Prowse & Blackburn, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…It is also clear that the data involved are too limited and contain too many inaccuracies and inconsistencies for such a conclusion (Moulton et al, 2010, 2012a, 2014, 2018; Moulton, Cropper & Avery, 2011, 2012b, 2013; Moulton & Cropper, 2014a, 2015, 2016). Simple modeling of numerical responses thus assumes that the habitat in the new location was suitable, that impacts of predators or competitors are inconsequential, that the demographic factors of the individuals released did not predispose them to have abnormally reduced population growth rates (e.g., too many males not enough females, the individuals were not too old or too inbred) and that a host of potentially negative human-related factors (e.g., time in captivity or in transit, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…In one of the few studies that examines several factors together—Moulton et al (2018) found that 76% of game bird species (13/17) always failed when released in the continental USA, suggesting they were ill suited as species (or perhaps in the place introduced), 77% (10/13) of the species that always failed in the locations to which they were introduced in the USA were successful somewhere else in the world.…”

Section: Introductionmentioning

confidence: 99%

“…The land area of the conterminous 48 states is in excess of 8,000,000 km 2 , whereas the entire Hawaiian archipelago encompasses just 16,663 km 2 . We know from previous studies (Moulton et al, 2018) that species that succeeded in some parts of the USA failed in other parts. Of course, any possible environmental differences across the USA, that could influence introduction outcomes, would vanish when subjected to this level of aggregation.…”

Section: Introductionmentioning

confidence: 99%

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Propagule pressure does not consistently predict the outcomes of exotic bird introductions

Moulton

Cropper

2019

PeerJ

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Some have argued that the role of propagule pressure in explaining the outcomes of bird introductions is well-supported by the historical record. Here, we show that the data from a large published database (including 832 records with propagule information) do not support the conclusion that propagule pressure is the primary determinant of introduction success in birds. A few compendia of historical reports have been widely used to evaluate introduction success, typically by combining data from numerous species and introduction locations. Very few taxa, other than birds, have usable spatially explicit records of introductions over time. This availability of data inflates the perceived importance of bird analyses for addressing factors related to invasion success. The available data allow limited testing of taxonomic and site-level factors of introduction outcomes. We did find significant differences in effort and success probabilities among avian orders and across highly aggregated spatial regions. As a test of a standard and logical expectation of the propagule pressure hypothesis, we concentrated on introductions with the smallest propagules, because it is for these the hypothesis is most likely to be correct. We analyzed the effect of numbers released in small propagules (two through 10) for 227 releases. Weighted linear regression indicated no significant effect of propagule size for this range of release size. In fact, the mean success rate of 28% for propagules of 2–10 isn’t significantly different than that of 34% for propagules of 11–100. Following the example of previous analyses, we expanded the statistical test of propagule pressure to include the full range of release numbers. No significant support for the propagule pressure hypothesis was found using logistic regression with either logit or complementary log-log link functions.

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Section: Resultsmentioning

confidence: 99%