The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Vitecek Simon - One of the best experts on this subject based on the ideXlab platform.
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Figure 3 from: Graf W, Konar M, Murányi D, Orci K, Vitecek S (2014) A new species of Isoperla (Insecta, Plecoptera) from the Karawanken, with considerations on the Southern Limestone Alps as centers of endemism. ZooKeys 448: 27-36. https://doi.org/10
2014Co-Authors: Graf Wolfram, Konar Martin, Murányi Dávid, Orci Kirill, Vitecek SimonAbstract:Figure 3 - Larval characters of Isoperla claudiae sp. n. A mature larva of Isoperla claudiae sp. n. in dorsal view, head and pronotum B ventral view of the abdomen end of Isoperla claudiae sp. n. C lacinia of Isoperla claudiae sp. n
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Figure 1 from: Graf W, Konar M, Murányi D, Orci K, Vitecek S (2014) A new species of Isoperla (Insecta, Plecoptera) from the Karawanken, with considerations on the Southern Limestone Alps as centers of endemism. ZooKeys 448: 27-36. https://doi.org/10
2014Co-Authors: Graf Wolfram, Konar Martin, Murányi Dávid, Orci Kirill, Vitecek SimonAbstract:Figure 1 - Isoperla claudiae sp. n. A habitus B colouration of the head of Isoperla claudiae C ventral view of the male abdomen with extruded penis D ventral view of the female abdomen
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Figure 2 from: Graf W, Konar M, Murányi D, Orci K, Vitecek S (2014) A new species of Isoperla (Insecta, Plecoptera) from the Karawanken, with considerations on the Southern Limestone Alps as centers of endemism. ZooKeys 448: 27-36. https://doi.org/10
2014Co-Authors: Graf Wolfram, Konar Martin, Murányi Dávid, Orci Kirill, Vitecek SimonAbstract:Figure 2 - Penis of Isoperla claudiae sp. n. A ventral view of the extruded penis B medial penial armature, scale bar 50 µm C medial penial armature, scale bar 50 µm D scales of the medial penial armature, scale bar 20 µm E scales found caudally the medial penial armature, scale bar 20 µm F medial penial armature of Isoperla orobica, scale bar 200 µm. Photographs A–E by W. Lechthaler, Vienna
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Figure 4 from: Graf W, Konar M, Murányi D, Orci K, Vitecek S (2014) A new species of Isoperla (Insecta, Plecoptera) from the Karawanken, with considerations on the Southern Limestone Alps as centers of endemism. ZooKeys 448: 27-36. https://doi.org/10
2014Co-Authors: Graf Wolfram, Konar Martin, Murányi Dávid, Orci Kirill, Vitecek SimonAbstract:Figure 4 - Oscillograms showing the drumming call of an Isoperla claudiae sp. n. male (ambient air temperature 24.2 °C). A oscillogram showing rhythm and amplitude variation patterns of a call B a faster oscillogram of two bi-beats from the second half of the call C variation of interval duration between bi-beats during the call presented in A. Inter-beat intervals were measured from the amplitude peak of one bi-beat to the amplitude peak of the next bi-beat (measured on the same call presented in A)
N. J. Alouf - One of the best experts on this subject based on the ideXlab platform.
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Cycles de vie de quelques Plécoptères (Insecta) d'un ruisseau temporaire du Liban
EDP Sciences, 2009Co-Authors: N. J. AloufAbstract:Le développement larvaire des 4 espèces de Plécoptères Capnia ? arensi Zhiltzova, Brachyptera galeata Koponen, Protonemura libanocypria Zwick et Isoperla libanica Aubert est étudié. Ces espèces colonisent un ruisseau temporaire du Liban. C. ? arensi est une espèce hivernale, B. galeata et P. libanocypria sont printanières, I. libanica est printanière tardive
Børn Økland - One of the best experts on this subject based on the ideXlab platform.
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Laboratory studies of egg development and diapause in Isoperla obscura (Plecoptera) from a mountain stream in Norway
Freshwater Biology, 1991Co-Authors: Børn ØklandAbstract:SUMMARY 1. A laboratory study of egg development of the stonefly Isoperla obscura (Zetterstedt) collected from the stream Flybekken (southern Norway, 61°25'N, 8°48'E, 1373 m a.s.l.) showed a short diapause followed by a prolonged period of postdiapause quiescence. 2. Diapause occurred over a wide range of temperatures (−20°C to +8°C), but 0–1°C was the most favourable for fast diapause development and successful hatching. Diapause development required temperatures below 12°C, but sub-zero diapause temperatures increased mortality during the postdiapause phase, as well as reducing hatching success. 3. The threshold for initiation of postdiapausal development was about 1–2°C. Development rate increased and variation in development time decreased at higher water temperatures. These may be important characteristics to ensure seasonal and geographical synchrony of development in individual populations. Low postdiapausal temperatures were unfavourable, despite a subsequent increase in water temperature. No response to postdiapausal photoperiod was detected. 4. The results agreed well with conditions noted in the natural environment, and with the abundance of this species at high altitudes and latitudes in Fennoscandia. Nevertheless, Isoperla obscura also occurs in streams in the maritime parts of western Norway. The results of the present study suggest that egg development in these populations will prove to be different.
José Manuel Tierno De Figueroa - One of the best experts on this subject based on the ideXlab platform.
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life cycles and nymphal feeding of Isoperla morenica tierno de figueroa and luzon ortega 2011 and brachyptera vera cordubensis berthelemy and baena 1984 plecoptera perlodidae and taeniopterygidae in a mediterranean stream spain
Aquatic Insects, 2017Co-Authors: Guillermo Quevedoortiz, Manuel Jesus Lopezrodriguez, Julio Miguel Luzonortega, Jose Maria Fernandezcalero, José Manuel Tierno De FigueroaAbstract:Some aspects of the biology of two endemic Iberian stonefly species, Isoperla morenica Tierno de Figueroa and Luzon-Ortega, 2011 and Brachyptera vera cordubensis Berthelemy and Baena, 1984, were st...
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On the identity of Isoperla curtata (Plecoptera: Perlodidae): behavioural and molecular approaches show the existence of two separate species
2011Co-Authors: José Manuel Tierno De Figueroa, Gaetani Brunella, López-rodríguez, Julio Miguel Luzón-ortega Manuel Jesús, Fochetti RomoloAbstract:Figueroa, José Manuel Tierno De, Gaetani, Brunella, López-Rodríguez, Julio Miguel Luzón-Ortega Manuel Jesús, Fochetti, Romolo (2011): On the identity of Isoperla curtata (Plecoptera: Perlodidae): behavioural and molecular approaches show the existence of two separate species. Zootaxa 3000: 49-58, DOI: 10.5281/zenodo.20270
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on the identity of Isoperla curtata plecoptera perlodidae behavioural and molecular approaches show the existence of two separate species
Zootaxa, 2011Co-Authors: José Manuel Tierno De Figueroa, Brunella Gaetani, Julio Miguel Luzonortega, Manuel Jesus Lopezrodriguez, Romolo FochettiAbstract:The identity of Isoperla curtata Navas, 1924, an Iberian endemic, has been questioned since its description. Marked variability in pigmentation, wing length, penial armature and ecology of populations have been noted. To clarify the taxonomic status of I. curtata we examined variation in mating calls and cytochrome c oxidase subunit I sequences for two populations from north-central and southern Spain. Results of both approaches support the presence of two species. The north-central population corresponds to the nominal taxon, I. curtata, while southern populations represent a new species, Isoperla morenica, described herein.
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The Mating Call of Isoperla bipartita Aubert, 1962 (Plecoptera, Perlodidae)
Aquatic Insects, 2002Co-Authors: José Manuel Tierno De Figueroa, Julio Miguel Luzón-ortegaAbstract:The mating call of Isoperla bipartita is described. The male call is composed of 3‐10 groups, each of 1‐4 rubs. The times between rubs average 89.52 msec (between first and second), 43.52 msec (between second and third) and 35.28 msec (between third and fourth). The time between two groups averages 180.75 msec and varies from 142 to 290 msec. The female answer is composed of a beat and rub repeated at 479.09 msec intervals on average and interspersed between the male call groups between 94 and 184 msec (mean = 118.11 msec) after the last rub of the male group. The I. bipartita call can be considered as a ‘complex and modified pattern’ because the male produces calls of 1‐4 rubs by group and the female answers overlapping the male call by percussion-rubbing-produced signals. Moreover, it is different from other studied Iberian Isoperla calls, being probably a species-specific behavioural pattern.
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Male calling, mating and oviposition in Isoperla curtata (Plecoptera: Perlodidae)
European Journal of Entomology, 2000Co-Authors: José Manuel Tierno De Figueroa, Julio Miguel Luzón-ortega, Antonino Sánchez-ortegaAbstract:The reproductive biology (drumming call, mating behaviour, fecundity and egg structure) of Isoperla curtata, an endemic species from the Southern Iberian Peninsula, is described. The male's mating call has a diphasic pattern, with a mean of 17.3 beats per call (range = 8-27; SD = 4.7) and a duration of 792.9 ms per call (range = 228-1312; SD = 307.9). This call differs from that of other species of Isoperla in having two distinct phases with different millisecond intervals, and is species-specific. Mating lasts between 131 and 3864 seconds (mean = 2180.9 s and SD = 1027.8). Since males and females mate more than once (mean number of matings per female was 1.85 and per male 2.25), the species is polyandric and polygynic. The position adopted by the male during mating is different from that described for other stonefly species. Other mating behaviours are interpreted as displacement manoeuvers, tactile stimulation and possibly sexual selection by cryptic female choice. There was a statistically significant correlation between size and the number of matings in females (r = 0.849; p = 0.016), but not in males. Each female laid between one to four egg masses composed of an average of 88.7 eggs. Maximum fecundity was 319 eggs. The mean egg volume was 80.5 × 105 µm3 which is very similar to that of other Isoperla species. An outstanding morphological characteristic of the egg is the lobed outline of the chorion cells.
J. M. Elliott - One of the best experts on this subject based on the ideXlab platform.
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Prey switching in four species of carnivorous stoneflies
Freshwater Biology, 2004Co-Authors: J. M. ElliottAbstract:Summary 1. Previous studies compared the functional responses to their prey, and both intraspecific and interspecific interference, in mature larvae of Dinocras cephalotes, Perla bipunctata, Isoperla grammatica and Perlodes microcephalus. The present study examines switching by larvae of the same species presented with different proportions of two contrasting prey types; larvae of Baetis rhodani and Chironomus sp. In each experiment, 200 prey were arranged in nine different combinations of the two prey types (20 : 180, 40 : 160, 60 : 140, 80 : 120, 100 : 100, 120 : 80, 140 : 60, 160 : 40, 180 : 20). Prey were replaced as they were eaten. A model predicted the functional response in the absence of switching and provided a null hypothesis against which any tendency for switching could be tested. 2. No evidence for prey switching by Dinocras and Perla was obtained, both species showing a slight preference for Baetis over Chironomus. Prey switching occurred in Isoperla and Perlodes. As the relative abundance of one prey type increased in relation to the alternative, the proportion eaten of the former prey changed from less to more than expected from its availability, the relationship being described by an S-shaped curve. Isoperla and Perlodes switched to a preference for Baetis when its percentage of the total available prey exceeded 57 and 42%, respectively. Equivalent values for Chironomus were 43 and 58% for Isoperla and Perlodes, respectively. Switching was strongest in Perlodes. 3. Non-switching in Dinocras and Perla was related to their feeding strategy, both species being more successful when using a non-selective ambush strategy at dusk and dawn rather than a search strategy during the night. Both Isoperla and Perlodes used a search strategy. The smaller Isoperla fed chiefly at dusk and dawn, and preferred Chironomus larvae, whereas most of the larger Perlodes fed continuously from dusk to dawn and preferred Baetis larvae.
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Interspecific interference and the functional response of four species of carnivorous stoneflies
Freshwater Biology, 2003Co-Authors: J. M. ElliottAbstract:Summary 1. A previous study compared the functional responses to their prey and intraspecific interference in mature larvae of Perlodes microcephalus, Isoperla grammatica, Dinocras cephalotes and Perla bipunctata. The present study extends this work by assessing interspecific interference between pairs of these species in equal numbers (one, two or three larvae per species) to provide total predator densities of two, four or six larvae. Baetis larvae as prey were replaced as they were eaten, and their density per predator was varied between 20 and 200 larvae. 2. The number of prey eaten by each competing species increased curvilinearly with prey density, the relationship being well described by a Type II model. Of the two constants in the model, handling time varied considerably between species, mean values being shortest for Perlodes, slightly higher for Isoperla, and much higher for Dinocras and Perla. It was not affected significantly either by predator density or the identity of the competing species. 3. Attack rate also varied between species and decreased with predator density. This decrease was slight for Perlodes, and also for Dinocras and Perla in competition with Isoperla. The decrease in Dinocras and Perla was similar to that for intraspecific interference. 4. The decrease in attack rate was described by a convex curve for Perlodes with the other three species and for Dinocras/Perla with Isoperla, but by a concave curve (negative power function) for Isoperla competing with the other three species, and for both Dinocras and Perla in competition with Perlodes. Prey consumption also decreased with predator density, the severity of competition with different species reflecting that for attack rate. 5. A comparison with previous results for intraspecific interference showed that the latter was dominant for Perlodes in all contests and for Dinocras or Perla competing with Isoperla, whilst interspecific interference dominated for Isoperla in all contests and for Dinocras and Perla competing with Perlodes. Both types of interference were applicable to competition between Dinocras and Perla. Isoperla was the least, and Perlodes the most, aggressive of the four species with Dinocras and Perla intermediate.
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A comparative study of the functional response of four species of carnivorous stoneflies
Freshwater Biology, 2003Co-Authors: J. M. ElliottAbstract:SUMMARY 1. Comparisons were made of the functional responses of mature larvae of Perlodes microcephalus, Isoperla grammatica, Dinocras cephalotes and Perla bipunctata. Experiments were performed in stream tanks with natural substrata and glass bottoms, so that feeding could be observed above and below the substratum. There was one stonefly per tank and one of 10 prey densities between 20 and 200 larvae of either Chironomus sp. or Baetis rhodani per tank. Consumed prey were replaced in a first set of experiments but not in a second set. Additional experiments assessed intraspecific interference between larvae of each predator species (two to five predators per tank). 2. The number of prey eaten increased curvilinearly with prey density. The relationship was described by two models, a Type II instantaneous model and its integrated equivalent, for experiments with and without prey replacement, respectively. Handling time did not change significantly with prey density, and was the same for experiments with and without prey replacement. Estimates of attack rate were similar for the two models, but varied between prey type and predator species. Handling time varied considerably but was normally distributed for each prey type and predator species. Mean handling time varied for Chironomus from 39 s for Isoperla, which rarely ate a whole larva, to 57 s for Perlodes and for Baetis from 116 s for Perlodes to 167 s for Perla. All predators were more efficient at capturing Baetis, but the longer handling time for Baetis ensured that more Chironomus were eaten. It was concluded that these variations in attack rate and handling time were related to activity and growth differences between the predator species, and that experiments with and without prey replacement could both be relevant to the field, depending on how the predators searched for food. 3. In the interference experiments, mean handling time did not change with increasing predator density, but attack rate decreased curvilinearly, the decrease varying from negligible for Isoperla to marked for Perlodes. Prey capture decreased with decreasing attack rate. Therefore, interference reduced prey consumption, but this effect was negligible for Isoperla and increasingly severe in the order Dinocras, Perla and Perlodes.
