predation

Legacy ID: 
4 240
Publication Title: 

Supersize me: Remains of three white-tailed deer (<i>Odocoileus virginianus</i>) in an invasive Burmese python (<i>Python molurus bivittatus</i>) in Florida

FORT Contact: 
Bob Reed
Authors: 
Scott M. Boback, Ray W. Snow, Teresa Hsu, Suzanne C. Peurach, Carla J. Dove, and Robert N. Reed
Related Staff: 
Bob Reed
Publication Date: 
2016
Parent Publication Title: 
BioInvasions Records
Publication Type: 
Archive number: 
States: 

Pub Abstract: 

Snakes have become successful invaders in a wide variety of ecosystems worldwide. In southern Florida, USA, the Burmese python (Python molurus bivittatus) has become established across thousands of square kilometers including all of Everglades National Park (ENP). Both experimental and correlative data have supported a relationship between Burmese python predation and declines or extirpations of mid- to large-sized mammals in ENP. In June 2013 a large python (4.32 m snout-vent length, 48.3 kg) was captured and removed from the park. Subsequent necropsy revealed a massive amount of fecal matter (79 cm in length, 6.5 kg) within the snake’s large intestine. A comparative examination of bone, teeth, and hooves extracted from the fecal contents revealed that this snake consumed three white-tailed deer (Odocoileus virginianus). This is the first report of an invasive Burmese python containing the remains of multiple white-tailed deer in its gut. Because the largest snakes native to southern Florida are not capable of consuming even mid-sized mammals, pythons likely represent a novel predatory threat to white-tailed deer in these habitats. This work highlights the potential impact of this large-bodied invasive snake and supports the need for more work on invasive predator-native prey relationships.

Publication Title: 

Agkistrodon piscivorus conanti (Florida cottonmouth) Diet

FORT Contact: 
Bryan Falk
Authors: 
Grajal-Puche, A., J. Josimovich, B. Falk, and R.N. Reed
Related Staff: 
Alejandro Grajal-Puche
Bryan Falk
Publication Date: 
2016
Parent Publication Title: 
Herpetological Review
Publication Type: 
Archive number: 
States: 

Pub Abstract: 

Agkistrodon piscivorus is a generalist predator that feeds on a variety of prey, including snakes (Gloyd and Conant 1990. Snakes of the Agkistrodon Complex: A Monographic Review. Society for the Study of Amphibians and Reptiles, Oxford, Ohio. 614 pp.; Lillywhite et al. 2002. Herpetol. Rev. 33:259–260; Hill and Beaupre 2008. Copeia 2008:105–114). Cemophora coccinea (Scarletsnake) is not known as one of the 26 species of snakes consumed by A. piscivorus (Ernst and Ernst 2011. Venomous Reptiles of the United States, Canada, and Northern Mexico: Volume 1. Johns Hopkins University Press, Baltimore, Maryland. 193 pp.). On 16 June 2015, at 2210 h, we found a dead-on-road A. piscivorus (total length [TL] = 51.0 cm) in Everglades National Park on Main Park Road, 1.88 km S Pa-hay-okee, Miami-Dade Co., Florida, USA (25.414085°N, 80.78183146°W, WGS84; elev. 3 m). The snake had been killed by a vehicle and some internal organs were exposed. Visible stomach contents included a small (TL ca. 15 cm) C. coccinea. Photographic vouchers of the A. piscivorus (UF-Herpetology 177194) and C. coccinea (UF-Herpetology 177195) were deposited in the Division of Herpetology, Florida Museum of Natural History, University of Florida. Despite the fact that these species are sympatric over large areas of the southeastern United States, this is the first known documented predation of C. coccinea by A. piscivorus.

Publication Title: 

Anaxyrus Boreas (Western Toad). Predation

FORT Contact: 
Erin Muths
Authors: 
Swartz, L.K, C.R. Faurot-Daniels, B.R. Hossack, and E. Muths
Related Staff: 
Erin Muths
Publication Date: 
2014
Parent Publication Title: 
Herpetological Review
Publication Type: 
Archive number: 
2014/0092 FORT
Species: 
Topics: 

Pub Abstract: 
Publication Title: 

American Badgers selectively excavate burrows in areas used by blackfooted ferrets: Implications for predator avoidance

FORT Contact: 
Dean Biggins
Authors: 
Eads, D.A., D.E. Biggins, T.M. Livieri, and J.J. Millspaugh
Related Staff: 
Dean Biggins
Publication Date: 
2013
Updated Date (text): 
2013-09-25
Parent Publication Title: 
Journal of Mammalogy
Publication Type: 
Archive number: 
2013/0102 FORT
States: 

Pub Abstract: 

We evaluated how American badgers (Taxidea taxus) might exert selective pressure on black-footed ferrets (Mustela nigripes) to develop antipredator defenses. In a colony of black-tailed prairie dogs (Cynomys ludovicianus) in South Dakota, badgers concentrated their activities where burrow openings and prairie dogs were abundant, a selective behavior that was exhibited by ferrets in the same colony. Badgers excavated burrows more often when in areas recently used by a ferret, suggesting that badgers hunt ferrets or steal prey from ferrets, or both. We also conducted an analysis of survival studies for ferrets and Siberian polecats (M. eversmanii) released onto prairie dog colonies. This polecat is the ferret’s ecological equivalent but evolved without a digging predator. Badgers accounted for 30.0% of predation on polecats and 5.5% of predation on ferrets. In contrast, both polecats and ferrets have evolutionary experience with canids, providing a plausible explanation for the similar relative impact of coyotes (Canis latrans) on them (65.0% and 67.1% of predation, respectively). We hypothesize that ferrets and badgers coexist because ferrets are superior at exploitation competition and are efficient at avoiding badgers, and badgers are superior at interference competition.

(c)Americam Society of Mammalogists

Publication Title: 

Selective predation by feral cats on a native skink on Guam

FORT Contact: 
Amy Yackel Adams
Authors: 
Lardner, B., R.N. Reed, A.A. Yackel Adams, M.J. Mazurek, T.J. Hinkle, P.M. Levasseur, M.S. Palmer, and J.A. Savidge
Related Staff: 
Bjorn Lardner
Bob Reed
Amy Yackel Adams
MJ Mazurek
Thomas Hinkle
Patricia Levasseur
Meredith Palmer
Julie Savidge
Publication Date: 
2013
Updated Date (text): 
2013-03-21
Parent Publication Title: 
IRCF Reptiles & Amphibians
Publication Type: 
Archive number: 
2013/0051 FORT
States: 

Pub Abstract: 
Publication Title: 

The big squeeze: pythons and mammals in Everglades National Park [Audio podcast]

FORT Contact: 
Bob Reed
Authors: 
Lubeck, M. and R. Reed
Related Staff: 
Bob Reed
Publication Date: 
2012
Updated Date (text): 
2013-05-03
Parent Publication Title: 
Publication Type: 
Archive number: 
2012/0029 FORT
Species: 
States: 

Pub Abstract: 
Publication Title: 

Do predators control prey species abundance? An experimental test with Brown Treesnakes on Guam

FORT Contact: 
Amy Yackel Adams
Authors: 
Campbell III, E.W., A.A. Yackel Adams, S.J. Converse, T.H. Fritts, and G.H. Rodda
Related Staff: 
Amy Yackel Adams
Thomas Fritts
Gordon Rodda
Publication Date: 
2012
Updated Date (text): 
2013-03-07
Parent Publication Title: 
Ecology
Publication Type: 
Archive number: 
2012/0047 FORT

Pub Abstract: 

The effect of predators on the abundance of prey species is a topic of ongoing debate in ecology; the effect of snake predators on their prey has been less debated, as there exists a general consensus that snakes do not negatively influence the abundance of their prey. However, this viewpoint has not been adequately tested. We quantified the effect of brown treesnake (Boiga irregularis) predation on the abundance and size of lizards on Guam by contrasting lizards in two 1-ha treatment plots of secondary forest from which snakes had been removed and excluded vs. two 1-ha control plots in which snakes were monitored but not removed or excluded. We removed resident snakes from the treatment plots with snake traps and hand capture, and snake immigration into these plots was precluded by electrified snake barriers. Lizards were sampled in all plots quarterly for a year following snake elimination in the treatment plots. Following the completion of this experiment, we used total removal sampling to census lizards on a 100-m2 subsample of each plot. Results of systematic lizard population monitoring before and after snake removal suggest that the abundance of the skink, Carlia ailanpalai, increased substantially and the abundance of two species of gekkonids, Lepidodactylus lugubris and Hemidactylus frenatus, also increased on snake-free plots. No treatment effect was observed for the skink Emoia caeruleocauda. Mean snout–vent length of all lizard species only increased following snake removal in the treatment plots. The general increase in prey density and mean size was unexpected in light of the literature consensus that snakes do not control the abundance of their prey species. Our findings show that, at least where alternate predators are lacking, snakes may indeed affect prey populations.

Publication Title: 

Boiga irregularis (Brown Treesnake). Predation attempt by crab

FORT Contact: 
Lea Bonewell
Authors: 
Lardner, B., J.A. Savidge, T.J. Hinkle, E. Wostl, S.R. Siers, R.N. Reed, G.H. Rodda
Related Staff: 
Bjorn Lardner
Thomas Hinkle
Elijah Wostl
Shane Siers
Bob Reed
Gordon Rodda
Publication Date: 
2011
Updated Date (text): 
2011-10-07
Parent Publication Title: 
Herpetological Review
Publication Type: 
Archive number: 
2011/0119 FORT

Pub Abstract: 

The Coconut Crab (Birgus lacro) , also known as the Robber Crab, is the heaviest terrestrial invertebrate in the world with a mass occasionally exceeding 3 kg (Amesbury 19BO. UL1iv. Guam Tech. Rep. 17:1-39). While primarily an omnivore feeding on vegetative matter and scavenging for dead animals, it may also prey on live invertebrates and vertebrates such as sea turtle hatchlings and rats (Greenaway 2003. Mem. Mus. Victoria 60:13-26; Kessler 2005. Crustaceana 78:761-762)...

Publication Title: 

Boiga irregularis (Brown Treesnake). Predation attempt by praying mantis

FORT Contact: 
Lea Bonewell
Authors: 
Lardner, B., J.A. Savidge, R.N. Reed, G.H Rodda
Related Staff: 
Bjorn Lardner
Bob Reed
Gordon Rodda
Publication Date: 
2011
Updated Date (text): 
2011-10-05
Parent Publication Title: 
Herpetological Review
Publication Type: 
Archive number: 
2011/0120 FORT

Pub Abstract: 

The Western Pacific island of Guam is known for its introduced population of Boiga irregularis that has had considerable negative effects on vertebrates native to the island (Rodda et a!. 1997. BioScience 47:565-574; Savidge 1987. Ecology 68:660-668). Few animals in Guam are known to prey on the snakes, hut Mangrove Monitors (Varanus indict/s) and feral/domestic cats (Felis catus) may do so (Fritts and Rodda 1998. Annu. Rev. Ecol. Sys. 29:113-140; pers. obs.)…

Publication Title: 

Boiga Irregularis (Brown Treesnake)

FORT Contact: 
Bob Reed
Authors: 
Wostl, E., T.J. Hinkle, B. Lardner, and R.N. Reed
Related Staff: 
Thomas Hinkle
Bjorn Lardner
Bob Reed
Publication Date: 
2011
Updated Date (text): 
2013-05-03
Parent Publication Title: 
Herpetological Review
Publication Type: 
Archive number: 
2011/0106 FORT

Pub Abstract: 

Introduced Boiga irregularis on the Western Pacific island of Guam feed on a wide variety of vertebrate prey. Stomach contents of juvenile B. irregularis specimens include a large proportion of lizards, especially geckos and skinks (Savidge 1988. J. Herpetol. 22:275–282). Guam is also home to Varanus indicus (Mangrove Monitor), which reach an adult size of ca. 560 mm SVL (Wikramanayake and Dryden 1988. Herpetologica 44:338–344). Varanus indicus are opportunists that feed primarily on arthropods (Dryden 1965. Micronesica 2:72–76), but they may prey on B. irregularis (Fritts and Rodda 1998. Annu. Rev. Ecol. Sys. 29:113–140; McCoid and Witteman 1993. Herpetol. Rev. 24:105). Occasionally the roles are reversed and the snakes prey on monitor eggs (Savidge 1988, op. cit.), but in general, interactions between V. indicus and B. irregularis remain poorly documented…

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