Population Structure of the Rare, Long-Lived Perennial Gentiana pneumonanthe in Relation to Vegetation and Management in the Netherlands

Oostermeijer, J.G.B.; Veer, R. van 't; Nijs, J.C.M. den

doi:10.2307/2404440

Cited by 181 publications

(208 citation statements)

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“…The above aspects of habitat quality are not exclusive but may act in concert to reduce net reproductive rate of the Dyje populations, leading to a regressive population stage structure and increased extinction risk in the long run (Oostermeijer et al 1994).…”

Section: Discussionmentioning

confidence: 99%

“…a high proportion of seedlings and juveniles, in response to high habitat quality (Jensen & Meyer 2001;Colling et al 2002), and especially regular land-use such as grazing or mowing (Oostermeijer et al 1994;Bühler & Schmid 2001;Lennartsson & Oostermeijer 2001;Bissels et al 2004), while populations under suboptimal conditions show a regressive stage structure, i.e. a high proportion of adult plants and no or only a few seedlings (Endels et al 2002).…”

Section: Discussionmentioning

confidence: 99%

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Variation in life-cycle between three rare and endangered floodplain violets in two regions: implications for population viability and conservation

2009

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Abstract:We studied the demography of Viola elatior, V. pumila, and V. stagnina, three rare and endangered Central European floodplain species, to (i) analyse variation in life-cycles among congeners and between regions (Dyje-Morava floodplains, Czech Republic; Upper Rhine, Germany), (ii) to define sensitive stages in the life-cycles, and (iii) to identify possible threats for population viability and species conservation. Matrix models were based on the fate of marked individuals from a total of 27 populations over two years. We analysed population growth rate (λ), stage distribution, net reproductive rate (R0), generation time, age at first reproduction, and elasticity and calculated a life table response experiment (LTRE). Most populations were declining and λ did not differ between species or regions during the observed interval. Despite higher probabilities for survival and flowering in the Dyje populations, R0 was higher in the Rhine populations. Also other demographic traits showed consistent differences between regions and/or species. Complex life-cycles and large variation in λ precluded unequivocal identification of sensitive stages or vital rates for conservation. Variation between regions may be a consequence of differences in habitat quality. Our results suggest that deterministic processes such as reduced management, succession, habitat destruction, and lack of disturbance through reduced or eliminated flooding present the strongest threat for the viability and persistence of populations of the three floodplain violets as compared with stochastic processes. However, the persistent seed bank of the species may buffer populations against environmental variation and represents a reservoir for recovery after resumption of suitable land-use management.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Variation in life-cycle between three rare and endangered floodplain violets in two regions: implications for population viability and conservation

2009

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“…For example, fruit harvested by humans can change the rate of recruitment of new individuals into the population, decreasing population viability and the availability of animal food, thus inducing changes to trophic networks that can affect other species of the community (Hall & Bawa 1993). Furthermore, the structure of exploited populations must be evaluated with consideration of historical land use and management practices, such as the establishment of pastures, cultivation shifts, forest management and fire use (Lykke 1998;Shanley et al 2002;Alexiades & Shanley 2004;Pulido & Caballero 2006), because these factors can influence the responses of populations to extractive practices (Oostermeijer et al 1994;Souza 2007;Giroldo & Scariot 2015).…”

Section: Introductionmentioning

confidence: 99%

Population structure and fruit availability of the babassu palm ( Attalea speciosa Mart. ex Spreng) in human-dominated landscapes of the Northeast Region of Brazil

et al. 2017

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We studied the population structure and fruit availability of the babassu palm, Attalea speciosa, in three humandominated landscapes located near a rural community in the region of Araripe, in the Northeast Region of Brazil, that were under intense fruit harvest. Fifty 10 x 10 m plots were randomly established in each of the three landscapes, and all individuals of A. speciosa within the plots were classifi ed as seedlings, juveniles or adults, with the height of all adult individuals being measured. An additional 20 individuals were marked in each landscape, and the number of total bunches, fruits per bunch and bunches per palm tree were recorded. Th e populations of A. speciosa in the three landscapes exhibited an inverted J-shape plot, but pasture and shifting cultivation possessed a signifi cantly higher number of individuals, seedlings and adults than the seasonal semideciduous forest, plus they possessed a greater seedling/adult ratio. Shifting cultivation was found to be favorable for fructifi cation. Th e present study found that shifting cultivation and pastures are landscape practices that can contribute to the rapid expansion and establishment of A. speciosa, which can become a dominant species in the region of Araripe.

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“…Other researchers have concentrated on the investigations of the fitness of individuals (Oostermeijer et al 1994b(Oostermeijer et al , 1995a, abundance and structure of populations (Chapman et al 1989;Oostermeijer et al 1992Oostermeijer et al , 1994aOostermeijer et al , 1996Rose et al 1998;Kesel & Urban 1999;Kostrakiewicz-Gierałt 2013), as well as the genetic variability of populations (Raijmann et al 1994;Oostermeijer et al 1995b).…”

Section: Introductionmentioning

confidence: 99%

The variability of Gentiana pneumonanthe L. subpopulations in different habitat conditions

Kostrakiewicz-Gierałt

2016

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Abstract. The impact of habitat conditions on the spatio-temporal variability of abundance and structure of subpopulations of Gentiana pneumonanthe L. was investigated in the years 2013-2015 in patches of abandoned Molinion caeruleae meadows in different stages of successional overgrowing (Patches I-III), as well as in a patch of willow thickets (Patch IV). The height of the standing vegetation and soil humidity increased in successive patches, while the light intensity at ground level diminished gradually. Performed observations showed that abundance of subpopulations decreased from Patch I to Patch IV. Seedlings, juvenile and dormant individuals were not found in all subpopulations, whereas the share of vegetative and generative adults differed significantly. The total number of above-ground units per individual, as well as the height of vegetative stems, increased in consecutive years; moreover, it augmented from Patch I to Patch III and it diminished in Patch IV. The height of flowering stalks rose in consecutive years and in successive patches. The numbers of flowers and fruits in consecutive years were rather constant, whilst in successive study sites they augmented gradually. In light of the performed studies, it might be concluded that the subpopulation occurring in Patch I presents the best state, whereas the subpopulation occurring in Patch IV shows the worst condition and, in the near future, might be eliminated from the colonised site.

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Population Structure of the Rare, Long-Lived Perennial Gentiana pneumonanthe in Relation to Vegetation and Management in the Netherlands

Abstract: Population structure of the rare, long-lived perennial Gentiana pneumonanthe in relation to vegetation and management in The Netherlands Oostermeijer, J.G.B.; van 't Veer, R.; den Nijs, J.C.M.

Cited by 181 publications

References 14 publications

Variation in life-cycle between three rare and endangered floodplain violets in two regions: implications for population viability and conservation

Variation in life-cycle between three rare and endangered floodplain violets in two regions: implications for population viability and conservation

Population structure and fruit availability of the babassu palm ( Attalea speciosa Mart. ex Spreng) in human-dominated landscapes of the Northeast Region of Brazil

The variability of Gentiana pneumonanthe L. subpopulations in different habitat conditions

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