scholarly journals Life history mediates mate limitation and population viability in self‐incompatible plant species

2014 ◽  
Vol 4 (6) ◽  
pp. 673-687 ◽  
Author(s):  
Peter H. Thrall ◽  
Francisco Encinas‐Viso ◽  
Susan E. Hoebee ◽  
Andrew G. Young
Keyword(s):  
Life History ◽  
Plant Species ◽  
Population Viability ◽  
Mate Limitation

scholarly journals Effect of host plant on the life history of the carnation tortrix moth Cacoecimorpha pronubana (Lepidoptera: Tortricidae)

2021 ◽  
pp. 1-7
Author(s):  
Marcin W. Zielonka ◽  
Tom W. Pope ◽  
Simon R. Leather
Keyword(s):  
Life History ◽  
Host Plant ◽  
Plant Species ◽  
Host Plants ◽  
Crop Protection ◽  
Plant Production ◽  
Pupal Weight ◽  
Production Environment ◽  
Host Plant Species ◽  
The Uk

Abstract The carnation tortrix moth, Cacoecimorpha pronubana (Hübner, [1799]) (Lepidoptera: Tortricidae), is one of the most economically important insect species affecting the horticultural industry in the UK. The larvae consume foliage, flowers or fruits, and/or rolls leaves together with silken threads, negatively affecting the growth and/or aesthetics of the crop. In order to understand the polyphagous behaviour of this species within an ornamental crop habitat, we hypothesized that different host plant species affect its life history traits differently. This study investigated the effects of the host plant species on larval and pupal durations and sizes, and fecundity (the number of eggs and the number and size of egg clutches). At 20°C, 60% RH and a 16L:8D photoperiod larvae developed 10, 14, 20 and 36 days faster when reared on Christmas berry, Photinia (Rosaceae), than on cherry laurel, Prunus laurocerasus (Rosaceae), New Zealand broadleaf, Griselinia littoralis (Griseliniaceae), Mexican orange, Choisya ternata (Rutaceae), and firethorn, Pyracantha angustifolia (Rosaceae), respectively. Female pupae were 23.8 mg heavier than male pupae, and pupal weight was significantly correlated with the duration of larval development. The lowest and the highest mean numbers of eggs were produced by females reared on Pyracantha (41) and Photinia (202), respectively. Clutch size differed significantly among moths reared on different host plants, although the total number of eggs did not differ. This study showed that different ornamental host plants affect the development of C. pronubana differently. Improved understanding of the influence of host plant on the moth's life history parameters measured here will help in determining the economic impact that this species may have within the ornamental plant production environment, and may be used in developing more accurate crop protection methodologies within integrated pest management of this insect.

Evidence of long and discontinuous juvenile periods in Trillium catesbaei under contrasting levels of herbivory

Botany ◽  
2014 ◽  
Vol 92 (1) ◽  
pp. 77-81 ◽  
Author(s):  
Christopher R. Webster ◽  
Michael A. Jenkins
Keyword(s):  
Life History ◽  
Reproductive Success ◽  
Age Structure ◽  
Morphological Characteristics ◽  
Population Viability ◽  
Plant Age ◽  
Life History Stage ◽  
Structure And Morphology ◽  
Single Leaf ◽  
Poor Indicator

We investigated the influence of chronic herbivory by white-tailed deer (Odocoileus virginianus (Zimmermann, 1780)) on the age structure and morphology of Trillium catesbaei Elliott. At sites with contrasting histories of deer abundance (Cades Cove, high; Whiteoak Sink, low), we measured morphological characteristics and determined minimum plant age for 60 plants (30 per site) in the single-leaf life-history stage. We chose this stage because its presence is considered an indication of successful reproduction by the previous generation, but its value could be inflated if plants regress or remain in this stage for extended periods. Our results suggest that T. catesbaei may spend upwards of a decade in this stage. Cades Cove single leaves were significantly older (p = 0.011) than those at Whiteoak Sink. Rhizome recession (decay of the oldest portion) was more common at Cades Cove, suggesting greater regression to this stage from three-leaf stages. Although minimum plant age was significantly associated with vegetative attributes (p < 0.002) at Whiteoak Sink, these attributes were decoupled at Cades Cove (p ≥ 0.642). Collectively, our results suggest that chronic herbivory may lead to a long and regressive residency period in the single-leaf stage. Consequently, in Trillium populations heavily impacted by deer, the number of single-leaf plants may be a poor indicator of reproductive success and population viability.

scholarly journals Recovery of Globba wengeri (C.E.C. Fisch.) K.J. Williams, critically endangered plant species from Serchhip District in Mizoram, Northeast India

2020 ◽  
Vol 7 (2) ◽  
pp. 178-181
Author(s):  
Lalnun Mawia ◽  
Vanlalhruaii Ralte ◽  
H. Lalruatsanga ◽  
Zothan Mawia ◽  
P.C. Vanlalhluna ◽  
...  
Keyword(s):  
Life History ◽  
Plant Species ◽  
Natural Habitat ◽  
Northeast India ◽  
Critically Endangered ◽  
Endangered Plant ◽  
Endangered Plant Species ◽  
The Family ◽  
First Time

Globba wengeri (C.E.C. Fisch.) K.J. Williams, former state flower of Mizoram, a rare and critically endangered plant species, commonly known as ‘dancing girl’, belonging to the family Zingiberaceae, is reported in this communication for the first time from Serchhip District in Mizoram at an elevation of about 1187 m a.s.l. It was found on moist, watery and rocky slopes. The plant is under severe threat in the natural habitat and therefore, further studies are required to determine life history and particular survival threats of this species.

Aggregation Status and Cue Type Modify Tadpole Response to Chemical Cues

2014 ◽  
Vol 6 (1) ◽  
pp. 199-207 ◽  
Author(s):  
Devin B. Preston ◽  
M. R. J. Forstner
Keyword(s):  
Life History ◽  
Chemical Cues ◽  
Response Strength ◽  
Population Viability ◽  
Antipredator Response ◽  
History Effects ◽  
Honestly Significant Difference ◽  
Significant Difference ◽  
History Of ◽  
Reduced Activity

Abstract Many anuran larvae exhibit an antipredator response to chemical cues released by potential predators. The genus Bufo is no exception, as many bufonids exhibit an antipredator response (e.g., reduction in activity) to the presence (recent and current) of predators. Using a mesocosm experiment in a field laboratory setting, we tested solo and groups of Bufo (Incilius) nebulifer tadpoles for an antipredator response to chemical cues produced by 1) the presence of anisopteran nymphs (kairomone cue) and 2) the predation of conspecifics by anisopteran nymphs (a combination of diet and alarm cues, which we termed predation cue). We quantified the magnitude of the response by calculating response strength. We analyzed data with a blocked ANOVA followed by a Tukey's honestly significant difference analysis. We found that chemical cue type (kairomone vs. predation) affected response strength, but aggregation status (solo vs. group) did not. Furthermore, solo tadpoles and groups of tadpoles reduced their activity in response to predation cues, whereas only solo tadpoles reduced their activity in response to kairomone cues, a heretofore unobserved phenomenon. Our results suggest that B. nebulifer tadpoles modulate their response to specific types of chemical cues depending on their aggregation status. As reduced activity comes at a cost to resource acquisition and growth, aggregation status may indirectly affect the life history of B. nebulifer. The elucidation of these potential life history effects may aid managers in estimating anuran population viability.

Effects of Phellinusweirii gaps on early successional vegetation following timber harvest

1996 ◽  
Vol 26 (2) ◽  
pp. 322-326 ◽  
Author(s):  
C.A. Ingersoll ◽  
M.V. Wilson ◽  
W.G. Thies
Keyword(s):  
Life History ◽  
Species Diversity ◽  
Plant Species ◽  
Timber Harvest ◽  
Timber Harvesting ◽  
Root Disease ◽  
Plant Species Composition ◽  
Clear Cutting ◽  
Species Groups ◽  
Successional Vegetation

A 65-year-old stand in northwestern Washington dominated by Pseudotsugamenziesii (Mirb.) Franco was harvested by clear-cutting in 1987. Before harvest, canopy gaps caused by the root-disease fungus Phellinusweirii (Murr.) Gilbn. covered about 22% of stand area. Five years after harvest, overall plant species composition of former gaps differed significantly from adjacent areas of previously intact forest. Forbs and trees were more abundant, and ferns less abundant, in areas of previously intact forest than in former gaps. In contrast, total cover, species diversity, and the abundance of plant species groups (defined by distributional and life history characteristics) did not differ significantly between areas of previously intact forest and former gaps. Plant species responded individualistically to timber harvesting in gaps and intact forest. These results show that development of root-disease gaps may influence understory patterns during early succession following harvest.

Modelling the population viability of a threatened amphibian with a fast life-history

2015 ◽  
Vol 26 (1) ◽  
pp. 9-19 ◽  
Author(s):  
Evan J. Pickett ◽  
Michelle P. Stockwell ◽  
John Clulow ◽  
Michael J. Mahony
Keyword(s):  
Life History ◽  
Population Viability

scholarly journals An Analysis of Potential Sensitive Plant Species For Long-Term Monitoring in Glacier National Park

1991 ◽  
Vol 15 ◽  
pp. 105-114
Author(s):  
Brian Mauer ◽  
Tara Williams
Keyword(s):  
Life History ◽  
Plant Species ◽  
National Park ◽  
Glacier National Park ◽  
Final Report ◽  
Ecological Groups ◽  
Plant Populations ◽  
History Data ◽  
Life History Data

Monitoring of the natural resources available in parks is necessary to allow the National Park Service to develop long term management strategies for preservation of those resources for future generations. To this end, personnel at Glacier National Park (GLAC) determined that it was necessary to identify populations of plant species that might serve as indicators of environmental change. Preliminary data on locations of populations of sensitive plants was obtained by the park from work done by Lesica (1984). However, basic life history data on these species bad not been collected and made available to park personnel in such a manner as to interface with existing park data bases. The acquisition of such data was seen as a necessary step in developing a baseline data base that park personnel could use to base future assessments of biological change within the park. The objective of the research described in this final report was to obtain basic life history data from the literature for 52 species of plant populations in GLAC judged to be rare or endangered, and hence potentially sensitive to changes-in the biological and environmental conditions in the park. To accomplish this objective, we used the list of rare plant species given by Lesica (1984; Table 1 of this report) with recent additions by the Montana Natural Heritage Program (1990) as the basis of a literature search to determine the basic life history attributes of each species. We used these data and the locations of populations of each species to document the spatial distribution of the different ecological groups represented by the rare flora of the park. This suggested that park personnel should focus on continued attempts to assess potential ecological changes in response to changes in the global climate induced by human activity. We suggest that the park take an active role in establishing permanent vegetation plots for monitoring changes in these sensitive plant populations. One such study (Lesica and McCune 1989) is already in progress.

scholarly journals Hummingbird foraging preferences under natural and experimental conditions

2017 ◽  
Author(s):  
Gabriel López-Segoviano ◽  
Maria del Coro Arizmendi
Keyword(s):  
Life History ◽  
Plant Species ◽  
Resident Species ◽  
Natural Conditions ◽  
Experimental Conditions ◽  
Study Region ◽  
Flight Cage ◽  
Feeding Resources ◽  
Common Plant ◽  
Common Plant Species

Background. Different studies have assessed hummingbirds’ preferences for feeding resources, mainly according to floral characteristics such as shape, color, and morphology, in addition to the nectar concentration, quantity, and sugar composition of flowers visited. Flower preferences can also depend on hummingbirds’ life history with respect to flower use. Hence, latitudinal migrant hummingbirds likely differ from resident species as they are accustomed to using a wider range of resources. In this study, we assessed the flower preferences of a migrant and a resident species that are common during winter in northern Mexico using both observational and experimental methods. Methods. We assessed hummingbird preferences for the most common plant species in the study region. In particular, we compared the preferences of two common hummingbird species, one resident (Amazilia beryllina) and one latitudinal migrant (Selasphorus rufus), for the most regionally common plant species, Cestrum thyrsoideum and Salvia iodantha, which have different color flowers yet produce similar energetic rewards. We calculated the Jacob selectivity index from preference data obtained under natural field conditions and with a flight cage in order to evaluate specific interactions. Results: Both hummingbird species showed different visitation rates to the studied plants under natural conditions in the study site. A. beryllina visited the yellow flowers of C. thyrsoideum more frequently, while S. rufus visited the fuchsia flowers of S. iodantha with greater frequency. In the flight cages, both species preferred the fuchsia flowers of S. iodantha when presented in similar or lesser abundance than the yellow flowers. Discussion. Under natural conditions, A. beryllina visited C. thyrsoideum to a greater extent in comparison with S. iodantha yet preferred S. iodantha in the flight cage when other hummingbirds were absent and even when S. iodantha was not the most abundant species. This could confirm that competition is an important process that drives the niche displacement of A. beryllina. On the other hand, the latitudinal migratory species S. rufus maintained its preferences for flowers of a familiar color under both natural and experimental conditions. Conclusions. Our results showed that the feeding preferences of the studied hummingbird species depend on the life history of each species. Therefore, the response of these migratory hummingbird species to feeding resources and possible exclusion from their preferred resources depends on their type of migration, territoriality, and possible associations with local plants.

scholarly journals Mismatches between demographic niches and geographic distributions are strongest in poorly dispersed and highly persistent plant species

2020 ◽  
Vol 117 (7) ◽  
pp. 3663-3669 ◽  
Author(s):  
Jörn Pagel ◽  
Martina Treurnicht ◽  
William J. Bond ◽  
Tineke Kraaij ◽  
Henning Nottebrock ◽  
...  
Keyword(s):  
Life History ◽  
Plant Species ◽  
Ecological Niche ◽  
Life History Traits ◽  
Environmental Gradients ◽  
Demographic Data ◽  
Interspecific Variation ◽  
Ecological Niches ◽  
Geographic Ranges ◽  
Geographic Distributions

The ecological niche of a species describes the variation in population growth rates along environmental gradients that drives geographic range dynamics. Niches are thus central for understanding and forecasting species’ geographic distributions. However, theory predicts that migration limitation, source–sink dynamics, and time-lagged local extinction can cause mismatches between niches and geographic distributions. It is still unclear how relevant these niche–distribution mismatches are for biodiversity dynamics and how they depend on species life-history traits. This is mainly due to a lack of the comprehensive, range-wide demographic data needed to directly infer ecological niches for multiple species. Here we quantify niches from extensive demographic measurements along environmental gradients across the geographic ranges of 26 plant species (Proteaceae; South Africa). We then test whether life history explains variation in species’ niches and niche–distribution mismatches. Niches are generally wider for species with high seed dispersal or persistence abilities. Life-history traits also explain the considerable interspecific variation in niche–distribution mismatches: poorer dispersers are absent from larger parts of their potential geographic ranges, whereas species with higher persistence ability more frequently occupy environments outside their ecological niche. Our study thus identifies major demographic and functional determinants of species’ niches and geographic distributions. It highlights that the inference of ecological niches from geographical distributions is most problematic for poorly dispersed and highly persistent species. We conclude that the direct quantification of ecological niches from demographic responses to environmental variation is a crucial step toward a better predictive understanding of biodiversity dynamics under environmental change.

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