Seasonal dynamics of three coexisting aphid species: implications for estimating population variability

AbstractSeasonal patterns of abundance and population variability were determined for Macrosiphum euphorbiae (Thomas), Myzus persicae (Sulzer), and Aphis nasturtii (Kaltenbach) (Hemiptera: Aphididae) in potato plots from weekly samples for 28 years. All species showed a single annual peak, but arrived and reached peak abundance at different times. Population variability (PV, a proportion between 0 and 1) for the week of peak abundance was close to that of other sample weeks and mean seasonal abundance. Based on mid-season abundance, PV of 0.76 for M. persicae differed significantly from 0.80 for A. nasturtii, as well as from 0.59 for M. euphorbiae. A weekly time scale for abundance, initiated at an early stage of plant growth, produced slightly different estimates of PV early and late in the season than a scale centred on peak abundance for each species. PV at the time of invasion differed from estimates for the rest of the summer. The annual abundance used to estimate PV was best determined in the context of aphid life history. Nevertheless, PV provided a robust and precise metric for comparing population variability among the three species, regardless of their seasonal patterns of abundance.

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Population variability and persistence of three aphid pests of potatoes over 60 years

The Canadian Entomologist ◽

10.4039/n10-053 ◽

2011 ◽

Vol 143 (1) ◽

pp. 91-101 ◽

Cited By ~ 10

Author(s):

Robert J. Lamb ◽

Patricia A. MacKay ◽

Andrei Alyokhin

Keyword(s):

Native Species ◽

Potato Crop ◽

Natural Populations ◽

Sampling Interval ◽

Aphid Species ◽

Population Variability ◽

Macrosiphum Euphorbiae ◽

Aphis Nasturtii ◽

Species Specific ◽

Interspecific Comparisons

AbstractAbundance, persistence, and variability of populations of Macrosiphum euphorbiae (Thomas), Myzus persicae (Sulzer), and Aphis nasturtii Kaltenbach (Hemiptera: Aphididae) in potato plots for intervals of 58 years (n = 1), 29 years (n = 2), 19–20 years (n = 3), and 9–10 years (n = 6) were compared. The abundance of M. euphorbiae showed no trend among decades and varied 2.4-fold, whereas that of M. persicae and A. nasturtii declined and showed 54-fold and 3700-fold variation, respectively. All three aphid species persisted through the first five decades and M. euphorbiae also persisted through the sixth (last) decade, but M. persicae and A. nasturtii failed to persist for 1 and 3 years of the last decade, respectively. Population variability (a proportion between 0 and 1) measured over a 58-year interval was high: 0.585 for M. euphorbiae, 0.771 for M. persicae, and 0.830 for A. nasturtii. During the first three but not the last three decades, population variability increased with sampling interval, owing to dramatic declines in abundance for M. persicae and A. nasturtii and one stable decade for M. euphorbiae, but no evidence of a more-time — more-variation effect was detected. Persistence was not related to population variability, but declined with abundance. Populations did not reach equilibrium, because of declining abundance for M. persicae and A. nasturtii and changes in population variability from decade to decade for M. euphorbiae. Populations of M. persicae and A. nasturtii from this crop monoculture were less stable than previously studied natural populations of a native aphid species. In contrast, the population of M. euphorbiae, a native species, had variability in a potato crop similar to that of the previously studied native species. The high population variability of M. persicae and A. nasturtii may be associated with their status as introduced species. The dynamic and species-specific characteristics of population variability require that interspecific comparisons be considered cautiously.

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Comparative propensity for dispersal of apterous and alate morphs of three potato-colonizing aphid species

Canadian Journal of Zoology ◽

10.1139/z97-766 ◽

1997 ◽

Vol 75 (9) ◽

pp. 1396-1403 ◽

Cited By ~ 25

Author(s):

Gilles Boiteau

Keyword(s):

Green Peach Aphid ◽

Aphid Species ◽

Reproductive Period ◽

Aphis Fabae ◽

Macrosiphum Euphorbiae ◽

Potato Aphid ◽

Average Percentage ◽

Flight Chamber ◽

Aphis Nasturtii ◽

Potato Aphids

The relative ability of apterous and alate morphs of aphids to disperse from one potato leaflet to another was similar within species. Three species were tested: the buckthorn aphid, Aphis nasturtii Kaltenbach, the potato aphid, Macrosiphum euphorbiae (Thomas), and the green peach aphid, Myzus persicae (Sulzer). The average percentage of aphids moving daily from one leaflet to another never exceeded 2.5% for nymphs of the three species, but reached 45% for the adult winged buckthorn aphid. During the first half of the reproductive period, adult potato aphids were 1.5 times as likely as buckthorn aphids and twice as likely as green peach aphids to relocate daily. In a flight chamber, buckthorn aphids flew 4.5 times longer than green peach or potato aphids. The maiden flights of these summer forms were interrupted by repeated landings lasting less than 2 min. The maiden flights were interrupted more than twice as often for the buckthorn aphid as for the potato aphid. The number of flight interruptions was intermediate for the green peach aphid. Selected dispersal parameters for these aphid species are compared with those for the black bean aphid, Aphis fabae Scopoli, an occasional potato-colonizing species. The percentage of green peach and potato aphids taking flight was significantly correlated with the temperature in the flight chamber. The implication of these results for the distribution of aphid populations and the epidemiology of viral diseases is discussed.

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Estimating population variability of aphids (Hemiptera: Aphididae): how many years are required?

The Canadian Entomologist ◽

10.4039/tce.2016.34 ◽

2016 ◽

Vol 149 (1) ◽

pp. 48-55 ◽

Cited By ~ 5

Author(s):

Robert J. Lamb ◽

Patricia A. MacKay ◽

Andrei Alyokhin

Keyword(s):

Time Series ◽

Population Dynamics ◽

Standard Deviation ◽

Coefficient Of Variation ◽

Population Variability ◽

The Other ◽

Macrosiphum Euphorbiae ◽

Mean Values ◽

Robust Estimates ◽

Aphis Nasturtii

AbstractVariability is an important characteristic of population dynamics, but the length of the time series required to estimate population variability is poorly understood. To this end, population variability of Macrosiphum euphorbiae (Thomas), Myzus persicae (Sulzer), and Aphis nasturtii (Kaltenbach) (Hemiptera: Aphididae) was investigated. Population variability (measured as PV, a proportion between 0 and 1) was estimated for time series of 3–62 years, giving replicate estimates for time series of 3–20 years that were normally distributed. Mean values for PV were more uniform for a time series of 12 years or longer than for shorter ones. The standard deviation of PV declined to a minimum at 12–15 years, as the length of the time series increased. Discrimination of estimates of PV was reliable for 15-year time series and longer, but not necessarily for shorter ones. Although M. euphorbiae had a relatively low PV, the coefficient of variation of that PV (12.5), was higher than for the other two species (3.5, 4.5). For robust estimates of PV, a time series of 15 years is recommended, because it minimises the standard deviation of PV, and discriminates values of PV that differ by 0.06 on a 0–1 scale.

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Development, Survival, and Fecundity of the Potato Aphid, Macrosiphum euphorbiae (Thomas), at Constant Temperatures

The Canadian Entomologist ◽

10.4039/ent94667-6 ◽

1962 ◽

Vol 94 (6) ◽

pp. 667-671 ◽

Cited By ~ 9

Author(s):

C. A. Barlow

Keyword(s):

Life History ◽

Macrosiphum Euphorbiae ◽

Potato Aphid ◽

Influence Of Temperature ◽

Controlled Conditions ◽

Influence Of Temperature On

Life-history and development of Macrosiphum euphorbiae (Thomas) have been studied by Smith (1919), Patch (1925), and MacGillivray and Anderson (1958). In most of these studies, considerable variation in temperature was experienced. The effects of different constant temperatures have never been reported. The following experiments were conducted to determine the influence of temperature on development, survival, and fecundity of M. euphorbiae under closely controlled conditions.

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Within-population variability in morphology and life history of Plantago major L. ssp. pleiosperma Pilger in relation to environmental heterogeneity

Oecologia ◽

10.1007/bf00329767 ◽

1990 ◽

Vol 84 (3) ◽

pp. 404-410 ◽

Cited By ~ 8

Author(s):

L. A. P. Lotz ◽

H. Olff ◽

P. H. van Tienderen

Keyword(s):

Life History ◽

Environmental Heterogeneity ◽

Population Variability ◽

Plantago Major ◽

History Of

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Seasonal Abundance, Life History, and Parasitism of Caloptilia porphyretica (Lepidoptera: Gracillariidae), a Leafminer of Highbush Blueberry

Journal of Economic Entomology ◽

10.1603/ec09104 ◽

2010 ◽

Vol 103 (2) ◽

pp. 284-291 ◽

Cited By ~ 2

Author(s):

James D. Barry ◽

Cesar R. Rodriguez-Saona ◽

Dean F. Polk ◽

Aijun Zhang

Keyword(s):

Life History ◽

Seasonal Abundance ◽

Highbush Blueberry

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Conversational System as Assistant Tool in Reminiscence Therapy for People with Early-Stage of Alzheimer’s

Healthcare ◽

10.3390/healthcare9081036 ◽

2021 ◽

Vol 9 (8) ◽

pp. 1036

Author(s):

Victor Morales-de-Jesús ◽

Helena Gómez-Adorno ◽

María Somodevilla-García ◽

Darnes Vilariño

Keyword(s):

Alzheimer’S Disease ◽

Alzheimer's Disease ◽

Life History ◽

Patient Information ◽

Early Stage ◽

Care Center ◽

Pharmacological Intervention ◽

Emotional States ◽

Reminiscence Therapy ◽

Past Experiences

Reminiscence therapy is a non-pharmacological intervention that helps mitigate unstable psychological and emotional states in patients with Alzheimer’s disease, where past experiences are evoked through conversations between the patients and their caregivers, stimulating autobiographical episodic memory. It is highly recommended that people with Alzheimer regularly receive this type of therapy. In this paper, we describe the development of a conversational system that can be used as a tool to provide reminiscence therapy to people with Alzheimer’s disease. The system has the ability to personalize the therapy according to the patients information related to their preferences, life history and lifestyle. An evaluation conducted with eleven people related to patient care (caregiver = 9, geriatric doctor = 1, care center assistant = 1) shows that the system is capable of carrying out a reminiscence therapy according to the patient information in a successful manner.

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