Search results for: SCOTT P. EGAN

Items from 1 to 20 out of 35 results

article

Environment and shipping drive environmental DNA beta‐diversity among commercial ports

Jose Andrés, Paul Czechowski, Erin Grey, Mandana Saebi, more

Molecular Ecology > 32 > 23 > 6696 - 6709

The spread of nonindigenous species by shipping is a large and growing global problem that harms coastal ecosystems and economies and may blur coastal biogeographical patterns. This study coupled eukaryotic environmental DNA (eDNA) metabarcoding with dissimilarity regression to test the hypothesis that ship‐borne species spread homogenizes port communities. We first collected and metabarcoded water...

article

Size‐associated energetic constraints on the seasonal onset of reproduction in a species with indeterminate growth

Robert A. S. Laroche, Kelly L. Weinersmith, Mazie L. Davis, Lisa Angeloni, more

Oikos > 2023 > 6 > n/a - n/a

The seasonal onset of reproduction is constrained in many systems by a need to first accumulate energetic reserves. Consequently, the observation that larger individuals reproduce earlier may be due to a negative relationship between size and mass‐specific basal metabolic rate that is shared across diverse taxa. However, an untested prediction of this hypothesis is that individuals should be metabolically...

article

Particle size influences decay rates of environmental DNA in aquatic systems

Pedro F. P. Brandão‐Dias, Daniel M. C. Hallack, Elise D. Snyder, Jennifer L. Tank, more

Molecular Ecology Resources > 23 > 4 > 756 - 770

Environmental DNA (eDNA) analysis is a powerful tool for remote detection of target organisms. However, obtaining quantitative and longitudinal information from eDNA data is challenging, requiring a deep understanding of eDNA ecology. Notably, if the various size components of eDNA decay at different rates, and we can separate them within a sample, their changing proportions could be used to obtain...

article

Speciation in Nearctic oak gall wasps is frequently correlated with changes in host plant, host organ, or both

Anna K. G. Ward, Robin K. Bagley, Scott P. Egan, Glen Ray Hood, more

Evolution > 76 > 8 > 1849 - 1867

Quantifying the frequency of shifts to new host plants within diverse clades of specialist herbivorous insects is critically important to understand whether and how host shifts contribute to the origin of species. Oak gall wasps (Hymenoptera: Cynipidae: Cynipini) comprise a tribe of ∼1000 species of phytophagous insects that induce gall formation on various organs of trees in the family Fagacae—primarily...

article

Delimiting the cryptic diversity and host preferences of Sycophila parasitoid wasps associated with oak galls using phylogenomic data

Yuanmeng M. Zhang, Sofia I. Sheikh, Anna K. G. Ward, Andrew A. Forbes, more

Molecular Ecology > 31 > 16 > 4417 - 4433

Cryptic species diversity is a major challenge regarding the species‐rich community of parasitoids attacking oak gall wasps due to a high degree of sexual dimorphism, morphological plasticity, small size and poorly known biology. As such, we know very little about the number of species present, nor the evolutionary forces responsible for generating this diversity. One hypothesis is that trait diversity...

article

Tissue‐specific gene expression shows a cynipid wasp repurposes oak host gene networks to create a complex and novel parasite‐specific organ

Ellen O. Martinson, John H. Werren, Scott P. Egan

Molecular Ecology > 31 > 11 > 3228 - 3240

Every organism on Earth depends on interactions with other organisms to survive. In each of these interactions, an organism must utilize the limited toolbox of genes and proteins it possesses to successfully manipulate or cooperate with another species, but it can also co‐opt the genome machinery of its partner to expand its available tools. Insect‐induced plant galls are an extreme example of this,...

article

Parallel host‐plant‐associated differences in an extended phenotype between populations of six species of gall‐forming insects

Linyi Zhang, Briley F. Mullin, Shihan Shzu, Charles K. Davis, more

Ecological Entomology > 47 > 3 > 323 - 330

Understanding the role of divergent host‐use in promoting population differentiation among herbivorous insects provides valuable insight into the origin of diversity in this species‐rich group. A strong signature of divergent selection in promoting population differentiation is provided by parallel phenotypic divergence across multiple insect species adapting to the same set of divergent host plants...

article

Genomically correlated trait combinations and antagonistic selection contributing to counterintuitive genetic patterns of adaptive diapause divergence in Rhagoletis flies

McCall B. Calvert, Meredith M. Doellman, Jeffrey L. Feder, Glen R. Hood, more

Journal of Evolutionary Biology > 35 > 1 > 146 - 163

Adaptation to novel environments can result in unanticipated genomic responses to selection. Here, we illustrate how multifarious, correlational selection helps explain a counterintuitive pattern of genetic divergence between the recently derived apple‐ and ancestral hawthorn‐infesting host races of Rhagoletis pomonella (Diptera: Tephritidae). The apple host race terminates diapause and emerges as...

article

Describing biodiversity in the genomics era: A new species of Nearctic Cynipidae gall wasp and its genome

Pedro F. P. Brandão‐Dias, Yuanmeng Miles Zhang, Stacy Pirro, Camila C. Vinson, more

Systematic Entomology > 47 > 1 > 94 - 112

Gall wasps (Hymenoptera: Cynipidae) specializing on live oaks in the genus Quercus (subsection Virentes) are a relatively diverse and well‐studied community with 14 species described to date, albeit with incomplete information on their biology, life history and genetic structure. Incorporating an integrative taxonomic approach, we combine morphology, phenology, behaviour, genetics and genomics to...

article

A test of adaptive divergence in a newly discovered host association of the soapberry bug Jadera haematoloma on Mexican buckeye, Ungnadia speciosa

Mattheau S. Comerford, Scott P. Carroll, Scott P. Egan

Entomologia Experimentalis et Applicata > 170 > 1 > 64 - 78

Host races represent an important step in the speciation process of phytophagous insects as they reflect the maintenance of genetically divergent host‐associated populations in the face of appreciable gene flow. The red‐shouldered soapberry bug, Jadera haematoloma (Herrich‐Schäffer) (Hemiptera: Rhopalidae), is an oligophagous seed predator with a history of host race evolution on plant associations...

article

Asymmetric, but opposing reductions in immigrant viability and fecundity promote reproductive isolation among host‐associated populations of an insect herbivore

Linyi Zhang, Glen R. Hood, Amy M. Roush, Shih An Shzu, more

Evolution > 75 > 2 > 476 - 489

Immigrant inviability can contribute to reproductive isolation (RI) during ecological speciation by reducing the survival of immigrants in non‐native environments. However, studies that assess the fitness consequence of immigrants moving from native to non‐native environments typically fail to explore the potential role of concomitant reductions in immigrant fecundity despite recent evidence suggesting...

article

Host plant associations and geography interact to shape diversification in a specialist insect herbivore

Amanda L. Driscoe, Chris C. Nice, Robert W. Busbee, Glen R. Hood, more

Molecular Ecology > 28 > 18 > 4197 - 4211

Disentangling the processes underlying geographic and environmental patterns of biodiversity challenges biologists as such patterns emerge from eco‐evolutionary processes confounded by spatial autocorrelation among sample units. The herbivorous insect, Belonocnema treatae (Hymenoptera: Cynipidae), exhibits regional specialization on three plant species whose geographic distributions range from sympatry...

article

Riverine distribution of mussel environmental DNA reflects a balance among density, transport, and removal processes

Arial J. Shogren, Jennifer L. Tank, Scott P. Egan, Diogo Bolster, more

Freshwater Biology > 64 > 8 > 1467 - 1479

Sampling water for environmental DNA (eDNA) is an emerging tool for documenting species presence without direct observation, allowing for earlier detection and faster response than conventional sampling methods in aquatic ecosystems. However, current understanding of how eDNA is transported in streams and rivers remains imprecise, with uncertainty of how the unique transport properties of eDNA...

article

Cascading reproductive isolation: Plant phenology drives temporal isolation among populations of a host‐specific herbivore

Glen R. Hood, Linyi Zhang, Elaine G. Hu, James R. Ott, more

Evolution > 73 > 3 > 554 - 568

All organisms exist within a complex network of interacting species, thus evolutionary change may have reciprocal effects on multiple taxa. Here, we demonstrate “cascading reproductive isolation,” whereby ecological differences that reduce gene flow between populations at one trophic level affect reproductive isolation (RI) among interacting species at the next trophic level. Using a combination of...

article

Limited genetic evidence for host plant‐related differentiation in the Western cherry fruit fly, Rhagoletis indifferens

Gilbert Saint Jean, Glen R. Hood, Scott P. Egan, Thomas H. Q. Powell, more

Entomologia Experimentalis et Applicata > 166 > 9 > 739 - 751

The shift of the fruit fly Rhagoletis pomonella (Walsh) in the mid‐1800s from downy hawthorn, Crataegus mollis (Torrey & Asa Gray) Scheele, to introduced domesticated apple, Malus domestica (Borkhausen), in the eastern USA is a model for ecological divergence with gene flow. A similar system may exist in the northwestern USA and British Columbia, Canada, where Rhagoletis indifferens Curran (Diptera:...

article

Retracted: Digest: Disentangled bank: Less diverse urban environments modify the shape and magnitude of natural selection*

Glen R. Hood, Linyi Zhang, Scott P. Egan

Evolution > 72 > 9 > 1972 - 1973

Urbanization provides a natural experiment for biologists to test how anthropogenic environmental change affects evolution in real time and frames predictions for anticipated evolutionary outcomes worldwide. Start et al. ([Start, D., 2018]) found that changes in species interactions (herbivore abundance and avian predation) along urbanization gradients predictably alter the shape and magnitude of...

article

Botanical parasitism of an insect by a parasitic plant

Scott P. Egan, Linyi Zhang, Mattheau Comerford, Glen R. Hood

Current Biology > 2018 > 28 > 16 > R863-R864

We report evidence of a new trophic interaction in nature whereby a parasitic plant attacks multiple species of insects that manipulate plant tissue when the two co-occur on a shared primary host plant. Most plant species are attacked by a great diversity of external and internal herbivores [1]. One common herbivore guild, gall-forming insects, induce tumor-like structures of nutrient-rich plant tissue...

article

Environmental DNA detection of aquatic invasive plants in lab mesocosm and natural field conditions

Crysta A. Gantz, Mark A. Renshaw, Daniel Erickson, David M. Lodge, more

Biological Invasions > 2018 > 20 > 9 > 2535-2552

Aquatic invasive plant species cause negative impacts to economies and ecosystems worldwide. Traditional survey methods, while necessary, often do not result in timely detections of aquatic invaders, which can be cryptic, difficult to identify, and exhibit very rapid growth and reproduction rates. Environmental DNA (eDNA) is a relatively new method that has been used to detect multiple types of animals...

article

Diversity and distribution of Wolbachia in relation to geography, host plant affiliation and life cycle of a heterogonic gall wasp

Hannes Schuler, Scott P. Egan, Glen R. Hood, Robert W. Busbee, more

BMC Evolutionary Biology > 2018 > 18 > 1 > 1-15

Background The maternally inherited endosymbiont Wolbachia is widespread in arthropods and nematodes and can play an important role in the ecology and evolution of its host through reproductive manipulation. Here, we survey Wolbachia in Belonocnema treatae, a widely distributed North American cynipid gall forming wasp that exhibits regional host specialization on three species of oaks and alternation...

article

Early detection monitoring for aquatic non-indigenous species: Optimizing surveillance, incorporating advanced technologies, and identifying research needs

Anett S. Trebitz, Joel C. Hoffman, John A. Darling, Erik M. Pilgrim, more

Journal of Environmental Management > 2017 > 202 > P1 > 299-310

Following decades of ecologic and economic impacts from a growing list of nonindigenous and invasive species, government and management entities are committing to systematic early- detection monitoring (EDM). This has reinvigorated investment in the science underpinning such monitoring, as well as the need to convey that science in practical terms to those tasked with EDM implementation. Using the...

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INFONA - science communication portal

Search results for: SCOTT P. EGAN

Environment and shipping drive environmental DNA beta‐diversity among commercial ports

Size‐associated energetic constraints on the seasonal onset of reproduction in a species with indeterminate growth

Particle size influences decay rates of environmental DNA in aquatic systems

Speciation in Nearctic oak gall wasps is frequently correlated with changes in host plant, host organ, or both

Delimiting the cryptic diversity and host preferences of Sycophila parasitoid wasps associated with oak galls using phylogenomic data

Tissue‐specific gene expression shows a cynipid wasp repurposes oak host gene networks to create a complex and novel parasite‐specific organ

Parallel host‐plant‐associated differences in an extended phenotype between populations of six species of gall‐forming insects

Genomically correlated trait combinations and antagonistic selection contributing to counterintuitive genetic patterns of adaptive diapause divergence in Rhagoletis flies

Describing biodiversity in the genomics era: A new species of Nearctic Cynipidae gall wasp and its genome

A test of adaptive divergence in a newly discovered host association of the soapberry bug Jadera haematoloma on Mexican buckeye, Ungnadia speciosa

Asymmetric, but opposing reductions in immigrant viability and fecundity promote reproductive isolation among host‐associated populations of an insect herbivore

Host plant associations and geography interact to shape diversification in a specialist insect herbivore

Riverine distribution of mussel environmental DNA reflects a balance among density, transport, and removal processes

Cascading reproductive isolation: Plant phenology drives temporal isolation among populations of a host‐specific herbivore

Limited genetic evidence for host plant‐related differentiation in the Western cherry fruit fly, Rhagoletis indifferens

Retracted: Digest: Disentangled bank: Less diverse urban environments modify the shape and magnitude of natural selection*

Botanical parasitism of an insect by a parasitic plant

Environmental DNA detection of aquatic invasive plants in lab mesocosm and natural field conditions

Diversity and distribution of Wolbachia in relation to geography, host plant affiliation and life cycle of a heterogonic gall wasp

Early detection monitoring for aquatic non-indigenous species: Optimizing surveillance, incorporating advanced technologies, and identifying research needs

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