scholarly journals Florivory by the occupants of phytotelmata in flower parts can decrease host plant fecundity

2021 ◽  
Author(s):  
Caio C C Missagia ◽  
Maria Alice S Alves
Keyword(s):  
Host Plant ◽  
Negative Influence ◽  
Female Fitness ◽  
Insect Larvae ◽  
Floral Tissue ◽  
Trophic Effects ◽  
Plant Fecundity ◽  
Ephemeral Habitats ◽  
Neutral Effect

Abstract Some types of plant accumulate liquid in their inflorescences creating phytotelmata. These environments protect the flowers against florivory, although they may be colonized by aquatic or semi-aquatic florivorous insect larvae, whose effects on the fitness of the plants remain unclear. We tested the hypothesis of floral antagonism by the occupants of phytotelmata, which predicts that florivory by the occupants of the phytotelmata represents a cost to the female fitness of the plant, reducing its fecundity. We manipulated experimentally the infestation by three florivores larvae species occupants of phytotelmata in inflorescences of Heliconia spathocircinata (Heliconiaceae) to test for negative direct trophic effects on the fecundity of the flowering and fruiting bracts. We found that the foraging of the hoverfly (Syrphidae) and moth (Lepidoptera) larvae in the inflorescences contributed to a decline in the fecundity of the plant. While the lepidopteran impacted fecundity when foraging in both flowering and fruiting bracts, the syrphid only affected the fruiting bracts, which indicates that the nectar and floral tissue are the principal resource exploited by the hoverfly. By contrast, soldier fly (Stratiomyidae) had a neutral effect on fecundity, while foraging in flowering or fruiting bracts. These findings corroborate our hypothesis, that herbivory by the larval occupants represents cost to the host plant having phytotelmata. The negative influence of this foraging on plant fecundity will nevertheless depend on the consequences of the exploitation of resources, which vary considerably in ephemeral habitats such as the phytotalmanta of flower parts.

PERFORMANCE OF TRIRHABDA VIRGATA (COLEOPTERA: CHRYSOMELIDAE) ON THREE POTENTIAL HOSTS

1999 ◽  
Vol 131 (6) ◽  
pp. 801-811 ◽  
Author(s):  
S.E. Blatt ◽  
A.M. Schindel ◽  
R. Harmsen
Keyword(s):  
Host Plant ◽  
Host Plants ◽  
Larval Survival ◽  
Food Plants ◽  
Fitness Components ◽  
First Instar ◽  
Plant Fecundity ◽  
Adult Fitness ◽  
Neonate Larvae ◽  
Trirhabda Virgata

AbstractThe suitability of three potential host plants, Solidago canadensis L. var. canadensis (Asteraceae), Solidago graminifolia (L.) Salisb., and Aster lateriflorus L. (Asteraceae), for the goldenrod beetle, Trirhabda virgata LeConte was determined by measuring several fitness components during the T. virgata life cycle. Neonate larvae were collected from S. canadensis plants and transplanted onto S. canadensis, S. graminifolia, and A. lateriflorus and maintained in field enclosures until the last instar was reached. Once brought into the laboratory, larvae were fed their assigned host plant until pupation. Following emergence, adults were weighed and separated into mating pairs to record oviposition and longevity. Eggs were kept in the laboratory until the following spring, when first instar larvae were taken into the field and re-established on their assigned host, and the experiment was repeated for 2 years. Larval survival and rate of development was not affected by the host plant. Mean weight of adults at emergence was greater on S. canadensis than on either S. graminifolia or A. lateriflorus. Two components of adult fitness, postmating longevity and realized fecundity, were measured. Longevity of adult female T. virgata was not affected by the host plant. Fecundity of T. virgata reared on A. lateriflorus and S. graminifolia was lower than the fecundity of females reared on S. canadensis. These results are consistent with the hypothesis that both intrinsic plant quality and the mobility of the foraging stage are important in the evolution of host range in T. virgata. These experiments were repeated over a 3-year period, using offspring from the survivors of the previous year for the 2nd and 3rd years. Over this time, individuals experienced "laboratory adaptation," and both accepted and increased their performance on previously unacceptable food plants.

Economic State and Institutional Environment of Russian Industrial Enterprises: The Empirical Analysis of Interrelations

2005 ◽  
pp. 67-86 ◽  
Author(s):  
G. Kleiner ◽  
R. Kachalov ◽  
E. Sushko
Keyword(s):  
Institutional Environment ◽  
Negative Influence ◽  
The State ◽  
Industrial Enterprises ◽  
Strategic Approach ◽  
Market Situation ◽  
Economic State ◽  
Essential Heterogeneity ◽  
The Empirical Analysis ◽  
Weak Influence

The paper presents the analysis of the data received from the survey of heads of industrial enterprises and also experts-researchers in 2003-2004. The data describe the economic state of enterprises and their position in competitive, administrative, intermediary, financial etc. environment. The assumption of essential heterogeneity of the set of industrial enterprises, including enterprises of the same sector or the same territorial formation is confirmed. It is shown that Russian industrial enterprises as a rule do not feel influence of the stock market situation while the condition of the currency market influences the majority of enterprises. The sensitivity of enterprises depends on their economic situation: the better is the state, the stronger is the influence. Weak influence of the investment and administrative environment on the state of enterprises and negative influence of the activity of intermediary organizations are registered. More than 2/3 of the respondents consider important strengthening of the responsibility of large proprietors for inefficient activity of their enterprises. Lack of the strategic approach in the activity of authorities of all levels is ascertained and the necessity of development and realization of industrial policy at all administrative levels, including the municipal one, is shown.

Implications of the Intergenerational Linking Functions for the Parental Selfdyad in the Treatment of a Narcissistic Adolescent

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Richard M. Zeitner
Keyword(s):  
Negative Influence ◽  
History Of

In this paper the author presents a case of a narcissistic adolescent boy with crippling anxieties and multiple inhibitions, where the contributing intergenerational history of self-difficulties had infiltrated the parental couple's "selfdyad" in a way that could not be adequately contained. Having lost much of the capacity for the mutual selfobject relatedness that is required for a good enough selfdyad regulation, the parents' introjects were then split off and re-projected into their child. The author demonstrates a way of working in the treatment with the use of multiple psychoanalytic therapies, individual, couple, and family modalities. Furthermore, he elaborates a rationale for such a format, especially for those cases in which the intergenerational family projection-linking functions are especially salient and continue to exert a negative influence on the identified patient.

Mango: A new host plant for the lycaeinid Anthene lycaenina lycaenina (R. Felder, 1868)

ENTOMON ◽  
2020 ◽  
Vol 45 (3) ◽  
pp. 237-238
Author(s):  
J. Nayanathara ◽  
R. Narayana
Keyword(s):  
Host Plant ◽  
New Host ◽  
First Time

Anthene lycaenina lycaenina (R. Felder, 1868) is reported on mango for the first time.

Kualitas Hidup Pasien Tuberkulosis Paru yang Mengalami Stigma Diri (Quality of Life Pulmonary Tuberculosis Patients With Self Stigma))

2019 ◽  
Vol 3 (2) ◽  
pp. 17-27
Author(s):  
Yunita Sari
Keyword(s):  
Quality Of Life ◽  
Pulmonary Tuberculosis ◽  
Descriptive Study ◽  
Negative Influence ◽  
Questionnaire Data ◽  
Average Quality ◽  
Tuberculosis Patients ◽  
Pulmonary Tb ◽  
Life Score

Pulmonary tuberculosis (TB) is a chronic disease that can bring about the sufferer's self-stigma and also affect his quality of life. A number of studies report that living with TB has a negative influence on the quality of life of sufferers even with or without self-stigma. The purpose of this study was to identify the quality of life of TB patients who experienced self-stigma. This research is a descriptive study, sample were 31 pulmonary TB patients. Data was collected using a questionnaire. Data analyzed by using frequency distribution and percentage. The researcher first screened TB patients who experienced self-stigma. The results showed that 25 people (80.64%) respondents experienced mild self-stigma. A total of 9 respondents (36%) had a quality of life score in the good category and as many as 16 respondents (64%) had enough category with an average quality of life score is 56.57. While respondents who had moderate self-stigma were 6 people (19.36%) with a good quality of life score was 1 person (16.67%) and enough category quality of life score were 5 people (83.33%) with an average quality of life score is 49.92.

Does Diversity in The Boardroom Add Value to a Firm?

2018 ◽  
Vol 18 (5) ◽  
Keyword(s):  
Firm Performance ◽  
Panel Data ◽  
Firm Size ◽  
Significant Influence ◽  
Negative Influence ◽  
Positive Influence ◽  
Future Research ◽  
Board Composition ◽  
Board Diversity

This study examines whether board diversity affects firm performance. We investigate this study using panel data of a sample of S&P 500 firms during a 12 year period. After controlling for industry, firm size, and other board composition variables, we find that all three board diversity variables of interest – gender, ethnicity, and age have a significant influence on firm performance. While ethnicity and age have a positive influence on firm performance, it was found that gender has a negative influence. Implications for future research are discussed.

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