Justin D Hoffman

Justin D Hoffman
McNeese State University | McNeese · Department of Biology and Health Sciences

PhD

About

42
Publications
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328
Citations

Publications

Publications (42)
Article
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Pituophis ruthveni (Louisiana Pine Snake) occurs in parts of western Louisiana and eastern Texas and was recently listed as a threatened species under the Endangered Spe�cies Act. It is considered a diet specialist because it mostly feeds upon Geomys breviceps (Baird’s Pocket Gopher), which make up ~75% of its estimated total prey biomass. Diet s...
Article
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Baird's pocket gopher (Geomys breviceps) is the only species of pocket gopher in Louisiana. Interest in this species' natural history has increased due to its close association with the Louisiana pine snake (Pituophis ruthveni), which recently was listed as threatened under the Endangered Species Act. Approximately 75% of P. ruthveni's estimated pr...
Article
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The Louisiana pine snake (Pituophis ruthveni) is one of the least studied snakes in North America and recently was listed as Threatened under the United States Endangered Species Act. They often are associated with longleaf pine (Pinus palustris) savanna and rely on the Baird's pocket gopher (Geomys breviceps) as a major part of their diet, as well...
Article
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In Louisiana, there is a lack of published reproductive information for the white-footed mouse (Peromyscus leucopus) and cotton mouse (Peromyscus gossypinus). We recorded reproductive data from the voucher tags of preserved P. leucopus (n = 652) and P. gossypinus (n = 1460) specimens captured in Louisiana, summarized monthly variation in reproducti...
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Managing species with small population sizes is challenging without current knowledge of where they occur and where suitable habitat is located. A literature and museum database search for distributional records of eight species of small mammals that are imperiled in Louisiana was conducted. Using that data, we generated habitat suitability models...
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Little is known about the reproductive habits of the 4 species of bat in the genus Lasiurus that live in Louisiana. We examined reproductive notes from specimen records for the eastern red bat (L. borealis), the Seminole bat (L. seminolus), the northern yellow bat (L. intermedius), and the hoary bat (L. cinereus). We found that gestation and partui...
Chapter
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Several mechanisms have been shown to influence species richness among island ecosystems, yet most studies limit their focus to a few predictor variables. The objective of this study is to investigate variation in Chiropteran richness across islands in the Caribbean Basin with an extensive set of predictor variables. Using recent faunal surveys, th...
Article
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Several mechanisms have been shown to influence species richness among island ecosystems, yet most studies limit their focus to a few predictor variables. The objective of this study is to investigate variation in Chiropteran richness across islands in the Caribbean Basin with an extensive set of predictor variables. Using recent faunal surveys, th...
Article
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Evaluation of success in salt-marsh restoration is often driven by subjective measures. By defining success criteria (SC), project effectiveness can be measured quantitatively. Herein, we quantify SC for an existing Spartina alterniflora (Smooth Cordgrass) restoration program. We selected stem density as an indicator of primary production and canop...
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The chiropteran fauna of the island of Saint Vincent, represented by 12 species, is among the most complex in the Lesser Antilles, being represented by four families including Noctilionidae (1 species), Mormoopidae (1), Phyllostomidae (8), and Molossidae (2). This fauna includes four trophic guilds as represented by Noctilio leporinus (piscivore/in...
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Whether cranial measurements or pelage color is most appropriate for identifying two subspecies of gray squirrel (Sciurus c. carolinensis and S. c. fuliginosus) has been a matter of debate. The objective of this research was to examine populations of gray squirrels in Louisiana, Arkansas, and Mississippi to determine which aspects of variation are...
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There has been some debate in the scientific literature on whether or not two subspecies of the swamp rabbit, Sylvilagus aquaticus aquaticus and S. a. littoralis, exist. The latter subspecies is believed to be restricted to habitats along the coast line of Texas, Louisiana, Mississippi, and Alabama. The objectives of this research were to record a...
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Little information is known about reproduction in the 3 species of shrews in Louisiana. We examined reproductive notes from specimen records for the southern short-tailed shrew (Blarina carolinensis), least shrew (Cryptotis parva), and southeastern shrew (Sorex longirostris). Most breeding activity occurred from March to December for B. carolinensi...
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Gaps between distributions of closely related species have been noted in the literature but little empirical research exists to explain these patterns. One hypothesis is poor habitat quality occurs within the gaps and therefore prevents species from inhabiting these areas. Multiple examples of gaps between species distributions can be found among d...
Article
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To provide the first analysis of predictors of both establishment and spread, both within and across taxa, for all vertebrate taxa within a region. We used Florida, USA, as our study system because it has a well-documented history of introduction and invasion, and is a hotspot for biological invasions. Florida, USA. We analysed non-indigenous speci...
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tailed shrews previously were consid-ered one species, Blarina brevicauda. System-atic studies of the genus Blarina have resulted in the recognition of 3 species (Handley 1971, Genoways and Choate 1972, George et al. 1982). The designation of separate species of Blarina resulted in a gap in knowledge of those species' natural history. One of the ne...
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The adult sex ratio (ASR) is an important component of a population's demographics and can be used as an indicator of a population's status. However, the causes of annual variation in ASRs are unknown for many species. Fluctuations in ASR can arise through demographic stochasticity and intense selective harvesting. In this study we investigate the...
Article
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Jerry Ronald Choate (1943–2009) had just retired as Director of the Sternberg Museum of Natural History and Professor of Biological Sciences, Fort Hays State University, Hays, Kansas, at the time of his death. Jerry served the American Society of Mammalogists in numerous capacities, including Recording Secretary, First Vice President, and most nota...
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Archeological and paleontological records indicate that the pronghorn (Antilocapra americana) have a history of at least 20,000 years of occurrence within the current boundaries of Nebraska. Pronghorns occurred throughout the state for much of its history. With the evidence at hand we concluded that the eastern boundary of the geographic distributi...
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Populations of pronghorn (Antilocapra americana) are subjected to multiple forms of density-dependent and density-independent regulation. Little is known about the combined effects of these variables across multiple populations throughout the landscape. The objectives of this study were to examine long-term trends in density and recruitment in pron...
Data
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Populations of pronghorn (Antilocapra americana) are subjected to multiple forms of density-dependent and density-independent regulation. Little is known about the combined effects of these variables across multiple populations throughout the landscape. The objectives of this study were to examine long-term trends in density and recruitment in pron...
Article
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Occurrences of mountain lions (Puma concolor) in Nebraska have been steadily increasing; however, reproductive activity in mountain lions has not been documented in the state. We present the first evidence of mountain lion reproduction in Nebraska since mountain lions recolonized the state in the early 1990s. On 28 February 2007, a spotted kitten w...
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Almost nothing is known concerning the chiropteran fauna on the Grenadine Islands, a chain of islands between St. Vincent and Grenada located near the southern end of the Lesser Antilles. Previously, only a single species—Glossophaga longirostris—had been reported from the Grenadines. Our research, conducted on 4 occasions over the period of 1980 t...
Article
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Much research has centered on determining which habitat model best predicts species occurrence. However, previous work typically used data sets that are inherently biased for evaluation. The use of simulated data provides a way of testing model performance using un-biased data where the true relationships between species occurrence and population p...
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In 2007, two new populations of feral swine were discovered in Nance and Valley counties, Nebraska, USA. Necropsies and serologic testing was done on two individuals from the Nance County herd. Results indicated that a lactating sow had positive antibodies for pseudorabies virus (PRV). Investigations conducted by Nebraska Game and Parks Commission...
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We report on a young male, cinnamon-phase American black bear (Ursus americanus) that was collected in northwestern Nebraska on 12 May 2008. This specimen represents the first black bear taken in Nebraska since 1907. Cranial characteristics and mass of the individual indicated a 15–16 month old bear. This bear may have dispersed from the Laramie Mo...
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Currently there are no published accounts of the specific diets of mink (Mustela vison) in Nebraska. Herein, we present findings of an historic data set on the winter diets of mink in Nebraska. Gastrointestinal (GI) tracts of mink were collected by the Nebraska Game and Parks Commission during the 1946-1947 fur trapping season. The contents of the...
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Investigaciones de la distribución de 2 especies de tuza, Geomys bursarius y Cratogeomys castanops, en Kansas, USA, revelaron la existencia de grandes trechos de tierra dentro de sus rangos de distribución que ninguna de las dos especies ocupa. Se hipotetizó que el hábitat y el uso del suelo en esos trechos excluyen a las tuzas. Para probar esta hi...
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Previous research suggests that the yellow-faced pocket gopher (Cratogeomys castanops) occupies a restricted range in western Kansas that is surrounded by the range of the plains pocket gopher (Geomys bursarius), which is regarded as a superior competitor. To determine whether the plains pocket gopher has encroached on the range of the yellow-faced...
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Riparian habitats are important components of an ecosystem; however, their hydrology combined with anthropogenic effects facilitates the establishment and spread of invasive plant species. We used a maximum-entropy predictive habitat model, MAXENT, to predict the distributions of five invasive plant species (Canada thistle, musk thistle, Russian ol...
Article
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Statistics is one of the most important yet difficult subjects for many ecology and wildlife graduate students to learn. Insufficient knowledge about how to conduct quality science and the ongoing debate about the relative value of competing statistical ideologies contribute to uncertainties among graduate students regarding which statistical tests...
Book
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The Recent mammalian fauna of Nebraska is composed of 89 native species, 8 domestic species that can have feral populations, and 4 wild species introduced by humans, but not by intentional action. Thus, the included checklist and dichotomous key contain 101 species of mammals. Of the native species, 36 are rodents, 20 carnivores, 13 bats, 7 shrews...
Article
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Two subspecies of the big brown bat (Eptesicus fuscus) are reported to occur in Nebraska. The eastern race, E. f. fuscus, is reportedly bigger and darker than its western counterpart E. f. pallidus. Where these 2 subspecies come in contact is the subject of debate. We used external, cranial, and colorimetric data to investigate geographic variation...
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My dissertation research is an important contribution to the growing field of predictive habitat modeling in ecology. I investigate innovative approaches for evaluating the performance of different predictive habitat models and applying these methods to large scale ecological phenomena. Several predictive habitat models currently exist. It has been...
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Dispersal is a basic feature of the natural history of moose. Most information about moose dispersal pertains to short-distance movements because long-distance movements are uncommon and difficult to observe. Since the 1950s, moose populations have been increasing in Minnesota and North Dakota. This may have contributed to several long-distance dis...
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In New Mexico, the tawny-bellied cotton rat (Sigmodon fulviventer) previously was known only from central and southwestern parts of the state. In central New Mexico, most records were from areas of tall grass and marshes associated with the middle Rio Grande valley. In 2003, we discovered S. fulviventer in grassy and marshy habitats > 100 km west o...
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By the early 1900's, several large carnivores had been extirpated from Nebraska as a result of unrestricted hunting and trapping by early European settlers. Recently, there have been several confirmed records of carnivores that were once extirpated from Nebraska. In our study, we present new data for five species that recently were documented in Ne...
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Distributional patterns of the four species of pocket gophers in southeastern Colorado are variously parapatric, allopatric, or sympatric. More specifically, Geomys bursarius is parapatric with Thomomys talpoides, Thomomys bottae, and Cratogeomys castanops; T. bottae is both sympatric and parapatric with C. castanops; and both C. castanops and T. b...