Papers by Jessica Hellmann
Heredity, 2009
Gene transfer between species during interspecific hybridization is a widely accepted reality in ... more Gene transfer between species during interspecific hybridization is a widely accepted reality in plants but is considered a relatively rare phenomenon among animals. Here we describe a unique case of mitochondrial DNA (mtDNA) paraphyly in the skipper genus, Erynnis, that involves well-diverged allopatric species. Using molecular evidence from both mitochondrial and nuclear genomes, we found high levels of intraspecific divergence in the mitochondrial genome within E. propertius (over 4% pair-wise sequence divergence) but no such differentiation in the nuclear genome. Sequence comparisons with related Erynnis suggest that past, but recent and infrequent introgression between E. propertius and E. horatius is the most reasonable explanation for the observed pattern of mtDNA paraphyly. This example of putative introgression highlights the complexity of mtDNA evolution and suggests that similar processes could be operating in other taxa that have not been extensively sampled. Our observations reinforce the importance of involving multiple genes with different modes of inheritance in the analysis of population history of congeneric taxa.
Molecular Ecology, 2014
Local adaptation of populations could preclude or slow range expansions in response to changing c... more Local adaptation of populations could preclude or slow range expansions in response to changing climate, particularly when dispersal is limited. To investigate the differential responses of populations to changing climatic conditions, we exposed poleward peripheral and central populations of two Lepidoptera to reciprocal, common-garden climatic conditions and compared their whole-transcriptome expression. We found evidence of simple population differentiation in both species, and in the species with previously identified population structure and phenotypic local adaptation, we found several hundred genes that responded in a synchronized and localized fashion. These genes were primarily involved in energy metabolism and oxidative stress, and expression levels were most divergent between populations in the same environment in which we previously detected divergence for metabolism. We found no localized genes in the species with less population structure and for which no local adaptation was previously detected. These results challenge the assumption that species are functionally similar across their ranges and poleward peripheral populations are preadapted to warmer conditions. Rather, some taxa deserve population-level consideration when predicting the effects of climate change because they respond in genetically based, distinctive ways to changing conditions.
The 95th ESA Annual Meeting, Jan 1, 2010
Wednesday, August 4, 2010 - 9:50 AM OOS 27-6: Does enemy loss cause release? A test of the enemy ... more Wednesday, August 4, 2010 - 9:50 AM OOS 27-6: Does enemy loss cause release? A test of the enemy release hypothesis in a range-expanding insect. Kirsten M. Prior and Jessica J. Hellmann. University of Notre Dame. Background ...
The 93rd ESA Annual Meeting, Jan 1, 2008
Background/Question/Methods Many species that expand their ranges occur at high abundances and ha... more Background/Question/Methods Many species that expand their ranges occur at high abundances and have large impacts in their new locales. In some cases, these outbreaking species affect native species through interspecific competition. Competition among insect herbivores ...
The 93rd ESA Annual Meeting, Jan 1, 2008
Monday, August 4, 2008 PS 2-29: The role of host plant transitions in the performance of a locall... more Monday, August 4, 2008 PS 2-29: The role of host plant transitions in the performance of a locally adapted specialist butterfly. Jessica A. Keppel, Shannon L. Pelini, and Jessica J. Hellmann. University of Notre Dame. Background ...
Ecology, Jan 1, 2010
Phytophagous insects commonly interact through shared host plants. These interactions, however, d... more Phytophagous insects commonly interact through shared host plants. These interactions, however, do not occur in accordance with traditional paradigms of competition, and competition in phytophagous insects is still being defined. It remains unclear, for example, if particular guilds of insects are superior competitors or important players in structuring insect communities. Gall-forming insects are likely candidates for such superior competitors because of their ability to manipulate host plants, but their role as competitors is understudied. We investigate the effect of invasive populations of an oak gall wasp, Neuroterus saltatorius, on a native specialist butterfly, Erynnis propertius, as mediated by their shared host plant, Quercus garryana. This gall wasp occurs at high densities in its introduced range, where we stocked enclosures with caterpillars on trees that varied in gall wasp density. Biomass production of butterflies was lower in enclosures on high-density than on low-density trees because overwintering caterpillars were smaller, and fewer of them eclosed into adults the following spring. To see if the gall wasp induced changes in foliar quality, we measured host plant quality before and after gall induction on 30 trees each at two sites. We found a positive relationship between gall wasp density and the percentage change in foliar C:N, a negative relationship between gall wasp density and the percentage change in foliar water at one site, and no relationship between the percentage change in protein-binding capacity (i.e., phenolics) and gall-wasp density. Additionally, there was a negative relationship between foliar quality and butterfly performance. Our results provide evidence for a plant-mediated impact of an invasive oak gall wasp on a native butterfly and suggest that gall wasps could act as superior competitors, especially when they occur at high densities.
The 95th ESA Annual …, Jan 1, 2010
Thursday, August 5, 2010 - 3:40 PM OOS 45-7: Adaptation to slow host plants prevents rapid insect... more Thursday, August 5, 2010 - 3:40 PM OOS 45-7: Adaptation to slow host plants prevents rapid insect responses to climate change. Shannon L. Pelini, Harvard University, Jessica A. Keppel, University of North Carolina, Ann E. Kelley ...
Nature, Jan 1, 2010
1. Nature. 2010 Jul 29;466(7306):563-6. Vacation reading. Shapin S, Bynum WF, Shermer M, Clayton ... more 1. Nature. 2010 Jul 29;466(7306):563-6. Vacation reading. Shapin S, Bynum WF, Shermer M, Clayton N, Daan S, von Storch H, Gong L, Orr D, Levitin D, Quiroga RQ, Callison C, Rohn J, Shipman P, Hellmann J, Daar A, Smil V. ...
The 94th ESA Annual Meeting, Jan 1, 2009
Wednesday, August 5, 2009 - 8:50 AM SYMP 12-3: Translocations experiments reveal constraints on r... more Wednesday, August 5, 2009 - 8:50 AM SYMP 12-3: Translocations experiments reveal constraints on range expansion under climate change. Jessica J. Hellmann, University of Notre Dame. Background/Question/Methods Species ...
Friday, August 10, 2007 - 11:10 AM OOS 51-10: Species on the edge: Genetic diversity and local cl... more Friday, August 10, 2007 - 11:10 AM OOS 51-10: Species on the edge: Genetic diversity and local climatic adaptation in butterflies with contrasting ecological traits. Evgueni V. Zakharov, Shannon Pelini, and Jessica J. Hellmann. University of Notre Dame. ...
The 93rd ESA Annual Meeting, Jan 1, 2008
Thursday, August 7, 2008 - 10:30 AM COS 83-8: Dispersal limitation at poleward range boundaries: ... more Thursday, August 7, 2008 - 10:30 AM COS 83-8: Dispersal limitation at poleward range boundaries: Consequences under climate change and the role of rarity. Travis D. Marsico and Jessica J. Hellmann. University of Notre Dame. Background/Question/Methods ...
Australian Journal of Botany, Jan 1, 2011
Page 1. Traits associated with drought survival in three Australian tropical rainforest seedlings... more Page 1. Traits associated with drought survival in three Australian tropical rainforest seedlings Jillian M. DeinesA,B, Jessica J. HellmannB and Timothy J. CurranA,C,D AThe School for Field Studies, Centre for Rainforest Studies, PO Box 141, Yungaburra, Qld 4884, Australia. ...
The 93rd ESA Annual Meeting, Jan 1, 2008
Monday, August 4, 2008 - 1:30 PM COS 4-1: The role of adaptation and differentiation in geographi... more Monday, August 4, 2008 - 1:30 PM COS 4-1: The role of adaptation and differentiation in geographic range shifts under climate change. Shannon L. Pelini and Jessica J. Hellmann. University of Notre Dame. Background/Question/Methods ...
The 95th ESA Annual Meeting, Jan 1, 2010
Friday, August 6, 2010 - 10:15 AM SYMP 22-7: Genomic biology and global change: Studies of local ... more Friday, August 6, 2010 - 10:15 AM SYMP 22-7: Genomic biology and global change: Studies of local adaptation to climate using common garden experiments and expression arrays. Jessica J. Hellmann, University of Notre Dame. Background/Question/Methods ...
Biological Conservation, Jan 1, 2007
Page 1. Erratum Erratum to ''Constraints and reinforcement on a... more Page 1. Erratum Erratum to ''Constraints and reinforcement on adaptation under climate change: Selection of genetically correlated traits'' [Biol. Conserv. 137 (2007) 599609] Jessica J. Hellmann a,*,1, Mario Pineda-Krch b,1,2 ...
eco.confex.com
Genomic biology and global change: Studies of local adaptation to climate using common garden exp... more Genomic biology and global change: Studies of local adaptation to climate using common garden experiments and expression arrays. Jessica J. Hellmann, Biological Sciences, University of Notre Dame, Notre Dame, IN Background/Question/Methods. ...
Climatic Change, Jan 1, 2006
The American Midland Naturalist, Jan 1, 2011
The user has requested enhancement of the downloaded file. All in-text references underlined in b... more The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately.
Molecular Ecology …, Jan 1, 2009
We report the development of microsatellite markers for the sister species Papilio glaucus and P.... more We report the development of microsatellite markers for the sister species Papilio glaucus and P. canadensis (Papilionidae: Lepidoptera). All 16 markers displayed a high degree of variation in both species, ranging from eight to 24 alleles per locus. Substantial heterozygote deficits were observed for several loci, indicating the presence of null alleles. All markers were successfully used to genotype dried samples from a historical collection. Cross-species amplification with six additional Papilio species showed that most loci can be used to study genetic variation in other closely related species of tiger swallowtails.
RE Hester and RM Harrison, Royal …, Jan 1, 2007
Page 52. The Extent and Future of Global Insect Diversity JESSICA J. HELLMANN AND NATHAN J. SANDE... more Page 52. The Extent and Future of Global Insect Diversity JESSICA J. HELLMANN AND NATHAN J. SANDERS 1 Introduction The world is changing at an astonishing pace. Not since the emergence of life in the oceans has the ...
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Papers by Jessica Hellmann