Population Persistence and Offspring Fitness in the Rare Bellflower<i>Campanula cervicaria</i>in Relation to Population Size and Habitat Quality

Eisto, Anna-Kaija; Kuitunen, Markku; Lammi, Antti; Saari, Veli; Suhonen, Jukka; Syrjäsuo, Susanna; Tikka, Päivi M.

doi:10.1046/j.1523-1739.2000.99283.x

Cited by 54 publications

(32 citation statements)

References 53 publications

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“…Thirdly, Oostermeijer et al (1996), Ågren (1996) and Eisto et al (2000) have shown that a reduced individual fitness does not necessarily im- (Table 5, Fig. 5).…”

Section: Fragmentation Extinctions and Colonizationmentioning

confidence: 92%

Patch occupancy, population size and reproductive success of a forest herb (Primula elatior) in a fragmented landscape

2002

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Forest fragmentation is expected to affect patch occupancy patterns, population size and population viability of plant populations through changes in both patch area and isolation. We tested the hypothesis that patch area has had a significant effect on patch occupancy and population size of Primula elatior, a common forest herbaceous plant species in Flanders, Belgium. The hypothesis that plants from small populations have lower fitness as reflected by several characteristics related to reproduction was also tested. Finally, the probability of P. elatior colonizing presently empty patches was investigated. Patch area proved to be the most important factor explaining population size. Patch area, spatial isolation and within-patch habitat characteristics all contributed significantly to the explanation of the distribution pattern of P. elatior. Plants from small populations had a significantly lower individual fitness than plants from large populations. Small populations produced significantly fewer seeds per fruit and per plant than did large populations. Individual seed mass decreased with increasing population size, but total seed mass increased with increasing population size. Plant-to-plant variability in the proportion of flowers setting fruit, number of seeds per fruit and number of seeds per plant decreased with increasing population size. Skewed pin-thrum ratios and lower pollination intensity may explain the reduced fecundity in small populations. Geographical isolation had a significant effect on the probability of P. elatior colonizing empty patches. The results show that patch area and isolation may influence regional persistence of plant populations through altered colonization probabilities and reduced reproductive success of small populations.

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“…Thirdly, Oostermeijer et al (1996), Ågren (1996) and Eisto et al (2000) have shown that a reduced individual fitness does not necessarily im- (Table 5, Fig. 5).…”

Section: Fragmentation Extinctions and Colonizationmentioning

confidence: 92%

Patch occupancy, population size and reproductive success of a forest herb (Primula elatior) in a fragmented landscape

2002

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“…EISTO et al 2000, VERGEER et al 2003. Moreover habitat quality may also be the key factor affecting plant performance.…”

Section: Effects Of Environmental Variablesmentioning

confidence: 99%

Effect of population size on the prospect of species survival

Münzbergová

2006

Folia Geobot

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Abstract:Many recent studies have demonstrated a negative effect of small population size on single plant traits. However, not much is known about the actual consequences of reduced plant performance on the long-term prospect of species survival.I studied the effect of population size on population growth rate and survival probability in the rare perennial herb Scorzonera hispanica occurring in fragmented grasslands. Its performance was measured using several traits related to reproduction in 21 populations ranging in size from 3 to 2475 plants. These data were then connected with data on full demography of the species from three of the studied populations. Two different matrix models differing in the number of transitions based on measurements in the populations differing in size were used to explore the relationship between population size and population growth rate.Both matrix models showed that despite the decline in seed production in small populations, population growth rate is never significantly different from one, and the populations could thus be expected to survive in the long run. Calculations of extinction probabilities that take into account demographic and environmental stochasticity, however, showed that populations below 100 flowering individuals have a high probability to become extinct. This demonstrates that demographic and environmental stochasticity is an important driver of the fate of small populations in this system. This study demonstrates that estimation of population growth rate can provide new insights into the effect of population size on population growth and survival. It also shows how matrix models enable the combination various pieces of information about the single populations into one overall measure, and may provide a useful tool for the standardization of studies on the effects of population size on population performance.

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“…However, our results are in concordance with observations of Eisto et al (2000) who have reported that population size in the perennial herb Campanula cervicarea) had no effect on its seed germination or seedling growth.…”

Section: Berteroisupporting

confidence: 93%

Pollination, Herbivory, and Habitat Fragmentation: Their Effects on the Reproductive Fitness of Angadenia berteroi, a Native Perennial Plant of the South Florida Pine Rocklands

Roque¹

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Population Persistence and Offspring Fitness in the Rare BellflowerCampanula cervicariain Relation to Population Size and Habitat Quality

Abstract: Data from several animal species and a few plant species indicate that small populations face an elevated risk of extinction. Plants are still underrepresented in these studies

Cited by 54 publications

References 53 publications

Patch occupancy, population size and reproductive success of a forest herb (Primula elatior) in a fragmented landscape

Patch occupancy, population size and reproductive success of a forest herb (Primula elatior) in a fragmented landscape

Effect of population size on the prospect of species survival

Pollination, Herbivory, and Habitat Fragmentation: Their Effects on the Reproductive Fitness of Angadenia berteroi, a Native Perennial Plant of the South Florida Pine Rocklands

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