scholarly journals Extinction and colonisation of habitat specialists drive plant species replacement along a Mediterranean grassland‐forest succession

2019 ◽  
Vol 30 (2) ◽  
pp. 331-340 ◽  
Author(s):  
Guillem Bagaria ◽  
Ferran Rodà ◽  
Joan Pino
Keyword(s):  
Plant Species ◽  
Forest Succession ◽  
Species Replacement ◽  
Habitat Specialists

scholarly journals Relation between plant species diversity and landscape variables in Central-European dry grassland fragments and their successional derivates

2017 ◽  
Vol 76 (2) ◽  
pp. 111-119
Author(s):  
Igor Paušič ◽  
Danijel Ivajnšič ◽  
Mitja Kaligarič ◽  
Nataša Pipenbaher
Keyword(s):  
Species Diversity ◽  
Plant Species ◽  
Alpha Diversity ◽  
Shape Index ◽  
Plant Species Diversity ◽  
Lower Altitude ◽  
Dry Grassland ◽  
Central European ◽  
Landscape Variables ◽  
Habitat Specialists

AbstractA systematic field survey of an area of 843 ha in the traditional Central-European agricultural landscape of Goričko Nature Park in Slovenia revealed 80 fragments of dry semi-natural grasslands. Vascular plant species diversity was studied in relation to landscape variables and to threat (Slovenian red-listed species). Our results show that fragment size does not affect plant species diversity. In addition, fragment shape index is not related to Alpha diversity. Higher Alpha diversity was observed for abandoned grassland fragments. The lowest Alpha diversity was perceived on more mesic fragments, where habitat specialists are much scarcer. It was confirmed that the highest diversity of specialists are in the driest fragments, both still mowed and abandoned. With an increase in the number of distinctly different bordering habitat types, the total number of species per fragment generally does not increase, except in the case of those fragments that are already in different succession stages. Abandoned and typical dry grasslands are associated with a higher number of bordering habitats. Typical dry grassland fragments and abandoned ones, which probably derived mostly from drier (less productive) grasslands, are found on lower altitude and have a lower shape index. Habitat specialistsSedum sexangulare, Polygala vulgarisandSpiranthes spiralishave higher frequency in fragments with a lower shape index. This means that these oligotrophic specialists occur in smaller fragments. ButOrchis moriohas higher frequencies of occurrence on polygons with a higher shape index, which confirms the observation that this species occurs in larger and more irregular fragments, as well as close to houses and fields and along the roads.

Effect of Herbivory and Plant Species Replacement on Primary Production

2000 ◽  
Vol 155 (6) ◽  
pp. 735-754 ◽  
Author(s):  
Claire de Mazancourt ◽  
Michel Loreau
Keyword(s):  
Primary Production ◽  
Plant Species ◽  
Species Replacement

scholarly journals Keragaman dan Pengendalian Tumbuhan Invasif di KHDTK Samboja, Kalimantan Timur (Diversity and Management of Invasive Plants in Samboja Research Forest, Kalimantan Timur)

2020 ◽  
Vol 8 (3) ◽  
pp. 351
Author(s):  
Bina Swasta Sitepu
Keyword(s):  
Invasive Species ◽  
Plant Species ◽  
Invasive Plants ◽  
Invasive Plant ◽  
Forest Succession ◽  
Acacia Mangium ◽  
Forest Area ◽  
Primary Forest ◽  
Secondary Forests ◽  
Invasive Plant Species

Historically, and based on the latest conditions, Samboja Research Forest has a fairly high vulnerability to the presence of invasive species that can interfere with ecosystem stability and forest succession. However, data collection and risk assessment of invasive species have not been conducted in the forest area. The study was carried out to support the management of Samboja Research Forest, particularly in controlling invasive species. The study was conducted with exploration techniques in open areas, secondary forests, and primary forests. The density and frequency data of invasive plants were obtained using random plots in secondary and primary forest areas. The results showed the presence of 52 invasive plant species in the Samboja Research Forest area with dominance by shrubs and herbs. Based on plants distribution and density, four crucial invasive plant species in Samboja Research Forest were identified, namely: Acacia mangium, Spathodea campanulata, Miconia crenata, and Piper aduncum. The management of invasive species was carried out in two stages, short term, through manual weeding, and in the long term, with the prevention, eradication, and periodic risk assessment.Keywords: invasive alien species, Kalimantan, eradication, Spathodea campanulata

Plant replacement trend in soft-water lakes with isoetids

2020 ◽  
Vol 49 (2) ◽  
pp. 157-167
Author(s):  
Rafał P. Ronowski ◽  
Krzysztof Banaś ◽  
Marek Merdalski ◽  
Józef Szmeja
Keyword(s):  
Plant Species ◽  
Vascular Plants ◽  
Aquatic Macrophytes ◽  
Environmental Gradient ◽  
Soft Water ◽  
Species Replacement ◽  
Inland Lakes ◽  
Large Populations ◽  
Water Acidity ◽  
Total Elimination

AbstractA number of small, shallow inland lakes in the Northern Hemisphere are acidic, soft-water water bodies, mostly fed by precipitation. Some of these lakes are home to Lobelia dortmanna and other aquatic macrophytes from the isoetid group. The present study identifies a plant species replacement trend along the main environmental gradient in such lakes, i.e. pH of water.In 70 lakes covered by the study and ordered along the gradient of increasing alkalinity, bryophytes gradually decline. Their decreasing frequency is 86.8% (pH 4.0), 32.5% (pH 6.5) and <10% (pH 6.6–9.5). At the same time, the frequency of vascular plants increases from 13.2% in strongly acidic lakes up to 92.8% in alkaline ones. The majority of isoetids usually occur at pH 5.5–6.7, but one of them (Littorella uniflora) often (frequency 40.5%) occurs also in eutrophic, alkaline lakes (pH 9.0–9.5), where it forms large populations. In lakes ranked according to the decreasing alkalinity gradient, bryophyte populations have been found to be smaller, while vascular plants become more abundant. The decreasing water acidity leads to partial or total elimination of bryophytes, which are replaced by eutrophilic vascular plants, frequently accompanied by some stonewort species.

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