The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform
Hiromi Uno - One of the best experts on this subject based on the ideXlab platform.
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lifetime eurythermy by seasonally matched thermal performance of developmental stages in an annual aquatic insect
Oecologia, 2020Co-Authors: Hiromi Uno, Jonathon H StillmanAbstract:Organisms with annual life cycles are exposed to life stage specific thermal environments across seasons. Seasonal variation in thermal environments can vary across years and among sites. We investigated how organisms with annual life cycles respond to predictable seasonal changes in temperature and unpredictable thermal variation between habitats and years throughout their lives. Field surveys and historical records reveal that the spatially and temporally heterogeneous thermal environments inhabited by the annual mayfly Ephemerella maculata (Ephemerellidae) shift the date for transition to the next, life stage, so that the thermal phenotype of each life stage matches the thermal environment of the specific habitat and year. Laboratory studies of three distinct life stages of this mayfly reveal that life stage transitions are temperature dependent, facilitating timing shifts that are synchronized with the current season's temperatures. Each life stage exhibited specific thermal sensitivity and performance phenotypes that matched the ambient temperature typically experienced during that life stage. Our study across the whole life cycle reveals mechanisms that allow organisms to achieve lifetime eurythermy in a dynamic seasonal environment, despite having narrower thermal ranges for growth and development in each life stage.
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migratory life cycle of ephemerella maculata traver 1934 Ephemerellidae
Aquatic Insects, 2019Co-Authors: Hiromi UnoAbstract:In this paper, I describe for the first time the migratory life cycle of an univoltine mayfly, Ephemerella maculata (Traver, 1934), between mainstems and tributaries of stream networks in Californi...
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Accepted Manuscript
2016Co-Authors: Larissa Walder, Hiromi UnoAbstract:A new nematode, Anomalomermis ephemerophagis n. g., n. sp. (Nematoda: Mermithidae) is described from the mayfly, Ephemerella maculata Traver,1934 (Ephermeroptera: Ephermerellidae), in California. The new species is characterized by 6 cephalic papillae and 4 additional disk papillae located on the head between the cephalic papillae and stoma. Additional diagnostic characters are: mouth opening terminal, absence of X-fibers in the cuticle of both postparasitic juveniles and adults, paired, curved, medium-sized spicules, a straight barrow-shaped vagina and large eggs. Two infectious agents were present in some specimens. This is the first description of an adult nematode from a mayfly. optera
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spatial and temporal linkage of stream riparian food webs by seasonal migration of mayfly ephemerella maculata
2016Co-Authors: Hiromi UnoAbstract:Author(s): Uno, Hiromi | Advisor(s): Sousa, Wayne P. | Abstract: Stream environments are spatially and temporally heterogeneous. Mainstem rivers are often wide, sunlit, warm and productive, while tributaries are shaded by riparian trees, unproductive, and remain cool in summer. Within mainstem rivers themselves there is substantial spatial heterogeneity in habitat structure and physical conditions, such as water temperature. River environments also change dramatically with season. Organisms that live in the riverine environment respond to and take advantage of such heterogeneous environments by moving between microhabitats or shifting their phenology. I studied the life cycle of a riverine mayfly, Ephemerella maculata (Ephemerellidae), in a northern California river system, its responses to spatial and temporal heterogeneity, and how its movements connect stream and riparian food webs in space and time. I discovered that E. maculata migrates between the mainstem and tributaries of rivers during its life cycle, thereby linking food webs in these two habitats, and enhancing predator growth in unproductive tributaries. The resource subsidy from productive but warm rivers to cool, unproductive tributaries associated with the mayfly migration increase the growth of stenothermic predators like juvenile salmonids in otherwise food-limited, cool thermal refuges, and increase their resilience to future warming. Furthermore, I examined the resilience of E. maculata to changes in water temperature using field surveys and lab rearing experiments. I discovered that different life stages of E. maculata have different thermal responses, and they shift their phenology depending on the water temperature, allowing each life stage to occur in the most desirable thermal condition. Therefore, as long as the natural seasonal pattern of the water temperature is sustained, E. maculata can resist temperature changes by shifting their phenology. Finally, I have shown that thermal spatial heterogeneity of rivers desynchronizes mayfly emergence timing, prolonging the subsidy period to riparian predators, and changing the predators’ responses to this subsidy.
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Anomalomermis ephemerophagis n. g., n. sp. (Nematoda: Mermithidae) parasitic in the mayfly Ephemerella maculata Traver (Ephermeroptera: Ephermerellidae) in California, USA
Systematic Parasitology, 2015Co-Authors: Larissa Walder, Hiromi UnoAbstract:A new nematode, Anomalomermis ephemerophagis n. g., n. sp. (Nematoda: Mermithidae) is described from the mayfly Ephemerella maculata Traver (Ephermeroptera: Ephermerellidae) in California. The new species is characterised by six cephalic papillae and four additional disk papillae located on the head between the cephalic papillae and stoma. Additional diagnostic characters are: a terminal mouth opening; absence of X-fibers in the cuticle of both postparasitic juveniles and adults; paired, curved, medium-sized spicules; a straight barrow-shaped vagina and large eggs. Two infectious agents were present in some specimens. This is the first description of an adult nematode from a mayfly.
W P Mccafferty - One of the best experts on this subject based on the ideXlab platform.
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revision of Ephemerellidae genera ephemeroptera
Transactions of The American Entomological Society, 2008Co-Authors: Luke M Jacobus, W P MccaffertyAbstract:Abstract The generic classification of Ephemerellidae Klapalek (Ephemeroptera) is reviewed and revised. Taxonomic status quo is maintained for the subfamily Timpanoginae Allen, except that Melanameleus Tiensuu (Ameletidae McCafferty) is not synonymous with Eurylophella Tiensuu. Data from the external morphology of eggs, larvae and adults of Ephemerellinae, s.s., species are coded into a data matrix and analyzed via the parsimony criterion of PAUP* to construct phylogenetic trees. A higher classification of Ephemerellinae is proposed based on the naming of groups from these trees. Two tribes are recognized and redefined: Ephemerellini, s.s., and Hyrtanellini Allen. Ephemerellini contains eleven genera: Drunella Needham [= Eatonella Needham, new synonym; = Myllonella Allen, new synonym; = Tribrochella Allen, new synonym; = Unirhachella Allen, new synonym], Caurinella Allen, Ephemerella Walsh, Matriella, new genus, Tsalia, new genus, Caudatella Edmunds, Notacanthella, new genus, Spinorea, new genus, Adoranex...
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revisionary contributions to north american ephemerella and serratella ephemeroptera Ephemerellidae
Journal of The New York Entomological Society, 2003Co-Authors: Luke M Jacobus, W P MccaffertyAbstract:Abstract The study of population variability and the reexamination of type material of certain Ephemerellidae species has revealed changes in status and new synonyms. Ephemerella dorothea Needham, 1908 [=E. infrequens McDunnough, 1924, new synonym, =E. mollitia Seemann, 1927, new synonym] is divided into two subspecies: E. d. dorothea, new status, and E. d. infrequens new status [=E. mollitia, new synonym]. New synonyms were discovered for the following: Ephemerella excrucians Walsh, 1862 [=E. inermis Eaton, 1884, new synonym, =E. argo Burks, 1947, new synonym, =E. crenula Allen and Edmunds, 1965, new synonym, =E. lacustris Allen and Edmunds, 1965, new synonym, =E. rossi Allen and Edmunds, 1965, new synonym, =E. rama Allen, 1968, new synonym], E. invaria Walker, 1853 [=E. rotunda Morgan, 1911, new synonym, =E. vernalis Banks, 1914, new synonym, =E. feminina Needham, 1924, new synonym, =E. fratercula McDunnough, 1925, new synonym, =E. inconstans Traver, 1932, new synonym, =E. choctawhatchee Berner, 1946, n...
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contribution to the biology and systematics of ephemerella alleni ephemeroptera Ephemerellidae
Pan-pacific Entomologist, 2003Co-Authors: Luke M Jacobus, Boris C Kondratieff, M D Meyer, W P MccaffertyAbstract:The adult stages of the western Nearctic species Ephemerella alleni Jensen & Edmunds are described for the first time based on reared specimens from Mount Rainier National Park, Washington, USA. Male adults are distinguished by having ganglionic marks on the abdominal sterna, genital forceps segment 2 with a distal expansion, penes with short apical projections, and spinulelike setae medially near the outer margin and along the inner margin of the medioapical cleft. Eggs have a smooth chorion. Larvae are distinguished from congeners by having a smooth frons and abdominal terga with distinctive paired spines. Morphological variability in these and other structures can confound identification of single specimens or short series of specimens. Our collection data represent the first new records of the species since its original description in 1966.
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first adult description for ephemerella hispida ephemeroptera Ephemerellidae
Entomological News, 2002Co-Authors: Luke M Jacobus, W P Mccafferty, S SpichigerAbstract:Reared material from Tennessee and South Carolina provide the bases for the first adult description of Ephemerella hispida. Structural characters associated with the male genitalia, such as the number and placement of ventral spines on the penes, differentiate this species from sympatric congeners.
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adult descriptions and commentary for two species of southeastern nearctic ephemerella ephemeroptera Ephemerellidae
Entomological News, 2001Co-Authors: Luke M Jacobus, W P MccaffertyAbstract:Reared and associated materials from Florida and the Great Smoky Mountains provide the bases for the first adult descriptions of Ephemerella choctawhatchee and E. rossi. Male adults of the two species are shown to be morphologically distinctive among congeners, based on characters associated with the male genitalia. The relatively similar larvae of E. choctawhatchee and E. invaria are possibly ecologically and geographically distinct. The first records of E. rossi from Georgia are provided.
Jacobus, Luke M. - One of the best experts on this subject based on the ideXlab platform.
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FIGURES 94–100 in Review of the Cincticostella insolta (Allen, 1971) complex (Ephemeroptera: Ephemerellidae), with description of three new species from northern India and Nepal
2019Co-Authors: Martynov Alexander, Selvakumar C., Subramanian K.a., Sivaramakrishnan K.g., Chandra Kailash, Palatov, Dmitry M., Sinha Bikramjit, Jacobus, Luke M.Abstract:FIGURES 94–100. Larva of Cincticostella braaschi Jacobus & McCafferty, 2008, specimens from India: 94, 95.—mandibles; 96.—labrum; 97.—hypopharynx; 98.—maxillary palp; 99.—maxilla; 100.—labium. Scale bar: 94–97, 99, 100.—0.5 mm; 98.—0.1 mm
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FIGURES 7–13 in Review of the Cincticostella insolta (Allen, 1971) complex (Ephemeroptera: Ephemerellidae), with description of three new species from northern India and Nepal
2019Co-Authors: Martynov Alexander, Selvakumar C., Subramanian K.a., Sivaramakrishnan K.g., Chandra Kailash, Palatov, Dmitry M., Sinha Bikramjit, Jacobus, Luke M.Abstract:FIGURES 7–13. Larva of Cincticostella richardi sp. nov., paratypes: 7, 8.—mandibles; 9.—labrum; 10.—hypopharynx; 11.— maxillary palp; 12.—apical part of maxilla; 13.—labium. Scale bar: 7–10, 13.—0.5 mm; 11.—0.1 mm; 12.—0.25 mm
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FIGURES 26–31 in Review of the Cincticostella insolta (Allen, 1971) complex (Ephemeroptera: Ephemerellidae), with description of three new species from northern India and Nepal
2019Co-Authors: Martynov Alexander, Selvakumar C., Subramanian K.a., Sivaramakrishnan K.g., Chandra Kailash, Palatov, Dmitry M., Sinha Bikramjit, Jacobus, Luke M.Abstract:FIGURES 26–31. Larva of Cincticostella sivaramakrishnani sp. nov., paratypes: 26.—dorsal habitus; 27.—head; 28.— projection of mesothorax; 29.—dorsal view of thorax; 30–31.—anterolateral projections of pronotum. Scale bar: 26–29.—1.0 mm; 30, 31.—0.5 mm
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FIGURES 1–6 in Review of the Cincticostella insolta (Allen, 1971) complex (Ephemeroptera: Ephemerellidae), with description of three new species from northern India and Nepal
2019Co-Authors: Martynov Alexander, Selvakumar C., Subramanian K.a., Sivaramakrishnan K.g., Chandra Kailash, Palatov, Dmitry M., Sinha Bikramjit, Jacobus, Luke M.Abstract:FIGURES 1–6. Larva of Cincticostella richardi sp. nov., holotype (1) and paratypes (2–6): 1.—dorsal habitus; 2.—head; 3.— projection of mesothorax; 4.—dorsal view of thorax; 5–6.—anterolateral projections of pronotum. Scale bar: 1–4.—1.0 mm; 5, 6.—0.5 mm
Luke M Jacobus - One of the best experts on this subject based on the ideXlab platform.
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revision of Ephemerellidae genera ephemeroptera
Transactions of The American Entomological Society, 2008Co-Authors: Luke M Jacobus, W P MccaffertyAbstract:Abstract The generic classification of Ephemerellidae Klapalek (Ephemeroptera) is reviewed and revised. Taxonomic status quo is maintained for the subfamily Timpanoginae Allen, except that Melanameleus Tiensuu (Ameletidae McCafferty) is not synonymous with Eurylophella Tiensuu. Data from the external morphology of eggs, larvae and adults of Ephemerellinae, s.s., species are coded into a data matrix and analyzed via the parsimony criterion of PAUP* to construct phylogenetic trees. A higher classification of Ephemerellinae is proposed based on the naming of groups from these trees. Two tribes are recognized and redefined: Ephemerellini, s.s., and Hyrtanellini Allen. Ephemerellini contains eleven genera: Drunella Needham [= Eatonella Needham, new synonym; = Myllonella Allen, new synonym; = Tribrochella Allen, new synonym; = Unirhachella Allen, new synonym], Caurinella Allen, Ephemerella Walsh, Matriella, new genus, Tsalia, new genus, Caudatella Edmunds, Notacanthella, new genus, Spinorea, new genus, Adoranex...
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revisionary contributions to north american ephemerella and serratella ephemeroptera Ephemerellidae
Journal of The New York Entomological Society, 2003Co-Authors: Luke M Jacobus, W P MccaffertyAbstract:Abstract The study of population variability and the reexamination of type material of certain Ephemerellidae species has revealed changes in status and new synonyms. Ephemerella dorothea Needham, 1908 [=E. infrequens McDunnough, 1924, new synonym, =E. mollitia Seemann, 1927, new synonym] is divided into two subspecies: E. d. dorothea, new status, and E. d. infrequens new status [=E. mollitia, new synonym]. New synonyms were discovered for the following: Ephemerella excrucians Walsh, 1862 [=E. inermis Eaton, 1884, new synonym, =E. argo Burks, 1947, new synonym, =E. crenula Allen and Edmunds, 1965, new synonym, =E. lacustris Allen and Edmunds, 1965, new synonym, =E. rossi Allen and Edmunds, 1965, new synonym, =E. rama Allen, 1968, new synonym], E. invaria Walker, 1853 [=E. rotunda Morgan, 1911, new synonym, =E. vernalis Banks, 1914, new synonym, =E. feminina Needham, 1924, new synonym, =E. fratercula McDunnough, 1925, new synonym, =E. inconstans Traver, 1932, new synonym, =E. choctawhatchee Berner, 1946, n...
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contribution to the biology and systematics of ephemerella alleni ephemeroptera Ephemerellidae
Pan-pacific Entomologist, 2003Co-Authors: Luke M Jacobus, Boris C Kondratieff, M D Meyer, W P MccaffertyAbstract:The adult stages of the western Nearctic species Ephemerella alleni Jensen & Edmunds are described for the first time based on reared specimens from Mount Rainier National Park, Washington, USA. Male adults are distinguished by having ganglionic marks on the abdominal sterna, genital forceps segment 2 with a distal expansion, penes with short apical projections, and spinulelike setae medially near the outer margin and along the inner margin of the medioapical cleft. Eggs have a smooth chorion. Larvae are distinguished from congeners by having a smooth frons and abdominal terga with distinctive paired spines. Morphological variability in these and other structures can confound identification of single specimens or short series of specimens. Our collection data represent the first new records of the species since its original description in 1966.
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first adult description for ephemerella hispida ephemeroptera Ephemerellidae
Entomological News, 2002Co-Authors: Luke M Jacobus, W P Mccafferty, S SpichigerAbstract:Reared material from Tennessee and South Carolina provide the bases for the first adult description of Ephemerella hispida. Structural characters associated with the male genitalia, such as the number and placement of ventral spines on the penes, differentiate this species from sympatric congeners.
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adult descriptions and commentary for two species of southeastern nearctic ephemerella ephemeroptera Ephemerellidae
Entomological News, 2001Co-Authors: Luke M Jacobus, W P MccaffertyAbstract:Reared and associated materials from Florida and the Great Smoky Mountains provide the bases for the first adult descriptions of Ephemerella choctawhatchee and E. rossi. Male adults of the two species are shown to be morphologically distinctive among congeners, based on characters associated with the male genitalia. The relatively similar larvae of E. choctawhatchee and E. invaria are possibly ecologically and geographically distinct. The first records of E. rossi from Georgia are provided.
David B Buchwalter - One of the best experts on this subject based on the ideXlab platform.
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phylogeny and size differentially influence dissolved cd and zn bioaccumulation parameters among closely related aquatic insects
Environmental Science & Technology, 2014Co-Authors: Monica D Poteat, David B BuchwalterAbstract:Evolutionarily distinct lineages can vary markedly in their accumulation of, and sensitivity to, contaminants. However, less is known about variability among closely related species. Here, we compared dissolved Cd and Zn bioaccumulation in 19 species spanning two species-rich aquatic insect families: Ephemerellidae (order Ephemeroptera (mayflies)), generalized to be metal sensitive, and Hydropsychidae (order Trichoptera (caddisflies)), generalized to be metal tolerant. Across all species, Zn and Cd uptake rate constants (k(u)s), efflux rate constants (k(e)s) and bioconcentration factors (BCFs) strongly covaried, suggesting that these metals share transport pathways in these distinct lineages. K(u)s and BCFs were substantially larger in Ephemerellidae than in Hydropsychidae, whereas k(e)s did not dramatically differ between the two families. Body size played an important role in driving ku differences among species, but had no influence on k(e)s. While familial differences in metal bioconcentration were striking, each family exhibited tremendous variability in all bioaccumulation parameters. At finer levels of taxonomic resolution (within families), phylogeny did not account for differences in metal bioaccumulation. These findings suggest that intrafamily variability can be profound and have important practical implications in that we need to better understand how well "surrogate species" represent their fellow congeners and family members.
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calcium uptake in aquatic insects influences of phylogeny and metals cd and zn
The Journal of Experimental Biology, 2014Co-Authors: Monica D Poteat, David B BuchwalterAbstract:Calcium sequestration in the hypo-osmotic freshwater environment is imperative in maintaining calcium homeostasis in freshwater aquatic organisms. This uptake process is reported to have the unintended consequence of potentially toxic heavy metal (Cd, Zn) uptake in a variety of aquatic species. However, calcium uptake remains poorly understood in aquatic insects, the dominant invertebrate faunal group in most freshwater ecosystems. Here, we examined Ca uptake and interactions with heavy metals (Cd, Zn) at low ambient Ca levels (12.5 μmol l −1 ) in 12 aquatic insect species within Ephemerellidae (mayfly) and Hydropsychidae (caddisfly), two families differentially responsive to trace metal pollution. We found Ca uptake varied 70-fold across the 12 species studied. Body mass and clade (family) were found to significantly influence both Ca uptake and adsorption ( P ≤0.05). Zn and Cd uptake rate constants ( k u ) exhibited a strong correlation ( r =0.96, P k u values. Further, neither Zn nor Cd exhibited inhibitory effects toward Ca uptake. In fact, we saw evidence of modest stimulation of Ca uptake rates in some metal treatments. This work suggests that insects generally differ from other freshwater taxa in that aqueous Ca uptake does not appear to be compromised by Cd or Zn exposure. It is important to understand the trace metal and major ion physiology of aquatic insects because of their ecological importance and widespread use as ecological indicators.