scholarly journals Assessment of adaptive capacity of native and adventive species of trees and shrubs in Dnipro region

2021 ◽  
Vol 50 ◽  
pp. 12-21
Author(s):  
I. A. Ivanko ◽  
A. F. Kulik
Keyword(s):  
Invasive Species ◽  
Peroxidase Activity ◽  
Tree Species ◽  
Native Species ◽  
Steppe Zone ◽  
Morus Alba ◽  
Acer Platanoides ◽  
Ulmus Pumila ◽  
Acer Negundo ◽  
Ulmus Laevis

Nowadays, deterioration and loss of ecological functions of urban tree and shrub plantations take place in Europe and, in particular, in Ukraine; it was noted that their number is insufficient to counteract the negative impact of global climate change and protect the population against industrial pollution effects. The issue of resistance of native and adventitious tree species used in the plantations of industrial cities remains relevant; it necessitates the assessment of physiological and biochemical aspects of their adaptation to extreme environmental factors, such as moisture limit in the steppe zone, periodic dangerously low winter temperatures and anthropo-technogenic load (in large urban agglomerations). In order to optimize the assortment of tree species of large megalopolises of the steppe zone of Ukraine and determine their potential resistance to anthropogenic pressures the study was conducted in conditionally clean forest biogeocenoses of the Samara River levee zone and in artificial plantations on the territories located in the coastal zone of the Dnipro River within 1500 m from the Prydneprovskaya thermal electric station (PTES, Dnipro city). It well known that the TPP is the source of atmospheric air pollution by such heavy metals as lead and cadmium. A study of the activity of antioxidant protection enzymes in leaves of native and adventive tree species showed that in the zone of Prydneprovskaya TES impact there was an increase of guaiacol peroxidase activity in Acer platanoides, Ulmus minor, Morus alba; benzidine peroxidase in Acer negundo, Ulmus laevis, Acer platanoides; catalase in A. platanoides, A. negundo, U. laevis, Ulmus pumila and Robinia pseudoasasia. High peroxidase activity, which is complemented by higher catalase activity, indicates the relative resistance of these species to atropo-technogenic pressures supported by antioxidant defense mechanisms. Total chlorophyll content (Chla + Chlb) in leaves of native species Ulmus laevis, Acer platanoides and adventive Morus alba decreased in the zone of TPP impact in relation to conditionally clean areas. The ratio of chlorophyll a to chlorophyll b in contaminated areas significantly increased in leaves of native species Ulmus laevis, Ulmus minor, Acer platanoides compared with control. The invasive species Acer negundo, Morus alba, Ulmus pumila had no significant changes in this indicator. In invasive species such as Ulmus pumila, Acer negundo there was an increase in leaf mass, which may indicate adaptation of these species to anthropogenically altered growth conditions.

Spontaneous forest communities of introduced species in Kryvyi Rih area

2020 ◽  
Vol 49 ◽  
pp. 3-16
Author(s):  
I. I. Korshіkov ◽  
Y. M. Petrushkevych ◽  
S. I. Shkuta
Keyword(s):  
Invasive Species ◽  
Woody Plants ◽  
Robinia Pseudoacacia ◽  
Ailanthus Altissima ◽  
Acer Platanoides ◽  
Rhamnus Cathartica ◽  
Ulmus Pumila ◽  
Acer Negundo ◽  
Trunk Diameter ◽  
North Western

The article is devoted to the study of woody plants communities, that spontaneously form in the abandoned areas of Kryvyi Rih Area as a result of spontaneous-invasive settling of species in previously established plantations. For the study, we laid 16 trial plots in 5 growth sites of such communities. We determined the species composition and biometric characteristics of primary woody plants and those, that formed these communities due to the invasion. In the first such community, which was formed due to the settling of other species in a 40-year-old plantation of Salix alba L., we found on 3 plots with an area of 625 m2 94 medium-sized trees Acer negundo L. having height (h) 11.8–13.6 m, trunk diameter (D) 16.8–17.3 cm and crown projection area (S) 9.5–10.4 m2, as well as 210 young generative trees, their height varies between 6.5–7.3 m, trunk diameter 5.0–5.4 cm, and the projection of the crown 2.5–6.3 m2. In this community also grow young and medium-generative trees of Robinia pseudoacacia L. – respectively 7 individuals – h = 7.2–11.7 m, D = 8.1–10.7 cm, S = 6.1–6.5 m2 and 7 ones – h = 13.5–14.0 m, D = 18.1–27.0 cm, S = 14.0–38.5 m2. Among self-seeding plants, such species predominate: Acer platanoides L. – 3905 specimens and Acer negundo – 1823 specimens. Three species dominate in the three dense forestation massive near the highway, which occupy an area of 250 m2: Robinia pseudoacacia, Ulmus pumila L., Fraxinus excelsior L. and Cerasus avium (L.) Moench. Robinia pseudoacacia is the most common among medium-generative plants, and Acer negundo, A. platanoides, A. tataricum L. – among young generative plants. Self-seeding of Robinia pseudoacacia, Acer platanoides, Fraxinus excelsior and Acer negundo is dominated in this area. In the abandoned Ulmus pumila plantation near the iron ore mine in three areas with an area of 625 m2, 12 to 33 specimens of medium-generative trees of this species with a height of 12.2–13.1 m with a trunk diameter of 14.7–16.0 cm and a crown projection of 25, 5–27.3 m2. Its self-seeding is quite active in all areas. Self-seeding plants of Acer negundo are also present here – 51 specimens and Acer platanoides – 35 ones. Self-seeding plants of A. platanoides – 9837 specimens, A. pseudoplatanus – 2111 specimens, Ailanthus altissima (Mill.) Swingle – 396 specimens dominate in the neglected park on the territory of 500 m2, where Acer pseudoplatanus, Acer platanoides, Robinia pseudoacacia grow. A study was also carried out on the example of the Zelena gully in order to determine how invasive species spontaneously penetrate into the formed steppe feathergrass-fescue phytocenoses. In the upper part of the Zelena gully, located outside of Kryvyi Rih, more than 40 years ago, forest belts were created from many species of shrubs, which have already been listed. Crataegus fallacina Klokov and Rhamnus cathartica L. diffusely inhabit and clearly predominate in the 6 trial plots that were laid on the slopes of the south-eastern and north-western exposures. In the presence of a large number of seed donors from the previously mentioned species on the slopes of the gully firstly Crataegus fallacina settles. Morphometric parameters of shrubs of these species were slightly larger on the north-western slope than on the south-eastern: the height of Crataegus fallacina – 2.5–2.9 m, and the diameter of the crown – 3.5–4.3 m, while in Rhamnus cathartica – the height of the bush was 0.7–0.8 m, and the diameter of the crown – 0.5–1.1 m. Thus, invasive species of Ulmus pumila, Acer negundo, Robinia pseudoacacia and Ailanthus altissima, which are the main in spontaneous communities in abandoned anthropogenically disturbed areas of the city, do not penetrate into stable phytocenoses. Most of these species of woody plants show low invasive activity and do not form multispecies communities in weakly disturbed feather-fescue phytocenoses.

scholarly journals Biochar Rescues Native Trees in a Global Biodiversity Hotspot

2022 ◽  
Author(s):  
Leeladarshini Sujeeun ◽  
Sean C. Thomas
Keyword(s):  
Invasive Species ◽  
Tree Species ◽  
Native Species ◽  
Biodiversity Hotspot ◽  
Native Plant ◽  
Inhibitory Effects ◽  
Island Ecosystems ◽  
Native Tree ◽  
Native Tree Species ◽  
Global Biodiversity

Many tropical invasive species have allelopathic effects that contribute to their success in native plant communities. Pyrolyzed biomass (“biochar”) can sorb toxic compounds, including allelochemicals produced by invasive plants, potentially reducing their inhibitory effects on native species. Strawberry guava (Psidium cattleianum) is among the most important allelopathic invasive species in tropical islands and recognized as the most serious invasive species threat in the global biodiversity hotspot of Mauritius. We investigated the effects of additions of locally produced biochar on native tree species in a field experiment conducted in areas invaded by strawberry guava within Mauritius’ largest national park. Growth and survivorship of native tree species were monitored over 2 ½ years in plots subjected to four treatments: non-weeded, weeded, weeded + 25 t/ha biochar and weeded + 50 t/ha biochar. Native tree growth and survivorship were strongly suppressed by strawberry guava. Biochar treatments dramatically increased native tree performance, with more than a doubling in growth, and substantially increased native tree survivorship and species diversity, while suppressing strawberry guava regeneration, consistent with growth-promoting properties and sorption of allelochemicals. We conclude that biochars, including “sustainable biochars” produced from locally accessible biomass using low-tech pyrolysis systems, have considerable potential to counteract effects of allelopathic invaders and increase the capacity for native species regeneration in tropical island ecosystems.

scholarly journals ДЕНДРОФЛОРА БАЛКИ ШИРОКА (ОСТРІВ ХОРТИЦЯ)

2018 ◽  
Vol 28 (2) ◽  
pp. 26-30
Author(s):  
S. O. Yakovlieva-Nosar' ◽  
V. P. Bessonova
Keyword(s):  
Quercus Robur ◽  
Robinia Pseudoacacia ◽  
Morus Alba ◽  
Acer Platanoides ◽  
Amorpha Fruticosa ◽  
Acer Negundo ◽  
Celtis Occidentalis

Байрачні ліси Запорізької обл. відносять до байраків порожистої частини Дніпра. Вони мають важливе кліматичне та ґрунтозахисне значення, у них трапляються представники лісових, степових, лугових фітоценозів, часто – рідкісні й ендемічні види, а також місцева фауна. Такі заліснені балки характеризуються високою атракторною здатністю для рекреантів, діяльність яких призводить до трансформації рослинності байрачно-лісових фітоценозів. З огляду на це актуальною є інформація про стан їх дендрофлори для створення банку даних та оперативного моніторингу. Наведено дані про видовий склад дендрофлори балки Широка, розташованої на о. Хортиця (зона рекреаційної діяльності туристів та мешканців м. Запоріжжя), де зареєстровано 54 види деревних рослин, що належать до 43 родів і 26 родин. Встановлено, що найбільшим видовим насиченням характеризується родина Rosaceae Adans. У складі дендрофлори байрачного лісу аборигенні види становлять 48,1 %, інтродуковані – 51,9 %. Найбільша частка участі серед інтродукованих видів належить породам північноамериканського походження (11 видів, або 39,3 % від усієї кількості інтродуцентів). Інтродуценти представлені здебільшого Amorpha fruticosa, Robinia pseudoacacia, Morus alba та Celtis occidentalis. Основними лісотвірними аборигенними породами насадження є Acer platanoides, Quercus robur, Ulmus scabra, A. tataricum. З'ясовано породний склад верхніх ярусів деревостану та підліску, що зростають на території різних морфологічних частин балки. Байрачний ліс має значний ресурсний потенціал, включаючи медоносні та вітамінні рослини. У складі насадження виявлено види з високою інвазійною здатністю (Acer negundo, Amorpha fruticosa, Robinia pseudoacacia) та той, що визнано інвазійним у списках близьких до України територій (Parthenocіssus quinquifolia).

Биогеохимическая активность парковых насаждений как индикатор устойчивости древесных растений

2019 ◽  
pp. 40-54
Author(s):  
N.V. Ivanisova ◽  
L.V. Kurinskaya
Keyword(s):  
Woody Plants ◽  
Quercus Robur ◽  
Robinia Pseudoacacia ◽  
Fraxinus Excelsior ◽  
Aesculus Hippocastanum ◽  
Acer Platanoides ◽  
Populus Alba ◽  
Acer Negundo ◽  
Tilia Platyphyllos ◽  
Ulmus Laevis

The relevance of the research is related to the improvement of the sustainability of park stands of the Rostov region, which have historical significance and conservation status. The longterm monitoring of the accumulation of heavy metals contributes to the establishment of the biogeochemical role of woody plants. The purpose of the research is to identify the biogeochemical activity of parkland stands of the steppe zone based on the study of the species and age composition of woody plants and the biological absorption coefficients of heavy metals. The coefficient of biological absorption (CBP) reflects the degree of concentration of the element in plants compared with adjacent media. KBP the ratio of the content of the element in the dry matter to the content in the soil on which they grow. This coefficient characterizes the intensity of extraction of chemical elements from the soil. In this case, the PCU for each element is largely determined by both chemical properties and the need of plants. The objects of research are parklands of RostovonDon, Taganrog, Novocherkassk, Azov and Bataysk. They are represented by trees aged 4050 years (7580). Trees over the age of 50 years (25) are found in the city of Taganrog. On the territory of the parks of Bataysk, a fairly large percentage of plantations (37) are represented by trees up to 20 years. It has been established that the species composition of park stands is represented by 11 species (Quercus robur L., Aesculus hippocastanum L., Ulmus laevis Pall, Fraxinus excelsior L., Fraxinus lanceolata Borkh, Robinia pseudoacacia L., Tilia platyphyllos Scop, Acer platanoides L., Acer negundo L., Populus alba L., Populus sowietica pyramidalis Jabl.) from 8 families (Fagaceae, Hippocastanaceae, Ulmaceae, Oleaceae, Fabaceae, Tiliaceae, Aceraceae, Salicaceae). Revealed dominant species in the park landscapes of the studied cities. Based on the monitoring of the park landscapes of the city of RostovonDon, it was revealed that during the growing season, the largest amount of metals deposited on the leaf surfaces of maple and linden. The selectivity of metal deposition by individual species is manifested in the accumulation of certain metals by them. On all studied objects (20022018), total accumulation of heavy metals by leaves of woody plants was calculated. The maximum coefficients of biological absorption were established: according to Zn(Populus sowietica pyramidalis, Populus alba, Ulmus laevis) Cu (Fraxinus excelsior, Aesculus hippocastanum, Quercus robur) Ni (Acer platanoides, Populus alba, Ulmus laevis). The minimum coefficient of biological absorption is set for Zn and Cu for Acer negundo, for Ni Tilia platyphyllos. A register of woody plants has been compiled to reduce the biogeochemical activity coefficient: Fraxinus excelsior Populus sowietica pyramidalis Populus alba (0,4) Aesculus hippocastanum Quercus robur (0,3) Acer platanoides Tilia platyphyllos Ulmus laevis Robinia pseudoacaciaia (0,2) Acer negundo Fraxinus lanceolata (0,1). Thus, the content of macroelements in plants has been established, which is determined by the systematic position family, genus and species. The parameters of the coefficients of biological absorption, and their dynamics depending on time (for example, the vegetation phase), the age of the organism, the soil, are recommended to be used as indicators of sustainability and selection of the assortment when renovating historical park landscapes. Актуальность исследований связана с повышением устойчивости парковых насаждений Ростовской области, которые имеют историческое значение и природоохранный статус. Проведение многолетнего мониторинга по накоплению тяжелых металлов вносит вклад в установлении биогеохимической роли древесных растений. Цель исследований выявление биогеохимической активности парковых насаждений степной зоны на основе изучения видового, возрастного состава древесных растений и коэффициентов биологического поглощения тяжелых металлов. Коэффициент биологического поглощения (КБП) отражает степень концентрации элемента в растениях по сравнению с сопредельными средами. КБП отношение содержания элемента в сухом веществе к содержанию в почве, на которой они произрастают. Этот коэффициент характеризует интенсивность извлечения химических элементов из почвы. При этом КБП для каждого элемента во многом определяется как химическими свойствами, так и потребностью растений. Объекты исследований парковые насаждения РостованаДону, Таганрога, Новочеркасска, Азова и Батайска. Они представлены деревьями в возрасте от 4050 лет (7580). Деревья в возрасте более 50 лет (25) встречаются на территории города Таганрога. На территории парков г. Батайска довольно большой процент насаждений (37) представлен деревьями до 20 лет. Установлено, что видовой состав парковых насаждений представлен 11 видами (Quercus robur L., Aesculus hippocastanum L., Ulmus laevis Pall, Fraxinus excelsior L., Fraxinus lanceolata Borkh, Robinia pseudoacacia L., Tilia platyphyllos Scop, Acer platanoides L., Acer negundo L., Populus alba L., Populus sowietica pyramidalis Jabl.) из 8 семейств (Fagaceae, Hippocastanaceae, Ulmaceae, Oleaceae, Fabaceae, Tiliaceae, Aceraceae, Salicaceae). Выявлены доминирующие виды в парковых ландшафтах изучаемых городов. На основе мониторинга парковых ландшафтах города РостованаДону выявлено, что за вегетационный период в наибольшее количество металлов осаждалось на листовых поверхностях клёна и липы. Избирательность осаждений металлов отдельными видами проявляется в накоплении ими определённых металлов. На всех изученных объектах (20022018 гг.) были рассчитаны суммарные показатели накопления тяжёлых металлов листьями древесных растений. Установлены максимальные коэффициенты биологического поглощения: по Zn (Populus sowietica pyramidalis, Populus alba, Ulmus laevis) по Cu (Fraxinus excelsior, Aesculus hippocastanum, Quercus robur) по Ni (Acer platanoides, Populus alba, Ulmus laevis). Минимальный коэффициент биологического поглощения установлен по Zn и Cu для Acer negundo, по Ni Tilia platyphyllos. Составлен реестр древесных растений по снижению коэффициента биогеохимической активности: Fraxinus excelsior Populus sowietica pyramidalis Populus alba (0,4) Aesculus hippocastanum Quercus robur (0,3) Acer platanoides Tilia platyphyllos Ulmus laevis Robinia pseudoacacia (0,2) Acer negundo Fraxinus lanceolata (0,1). Таким образом, установлено содержание макроэлементов в растениях, которое определяется систематическим положением семейством, родом и видом. Параметры коэффициентов биологического поглощения, и их динамика в зависимости от времени (например, фазы вегетации), возраста организма, почв рекомендуется использовать в качестве индикаторов устойчивости и подбора ассортимента при реновации исторических парковых ландшафтов.

ECOLOGICAL AND CENOTIC ROLE OF ALIEN PLANT SPECIES IN FOREST ECOSYSTEMS OF THE VORONEZH CITY DISTRICT

2020 ◽  
Vol 6(72) (1) ◽  
pp. 88-96
Author(s):  
L. A. Lepeshkina ◽  
M. A. Klevtsova ◽  
A. A. Voronin
Keyword(s):  
Invasive Species ◽  
Alien Species ◽  
Native Species ◽  
Forest Ecosystems ◽  
Pine Forests ◽  
Oak Forests ◽  
Acer Negundo ◽  
Ecological Parameters ◽  
Parthenocissus Quinquefolia

The processes of depletion of zonal vegetation are closely related to the settlement of invasive species. Within the forest ecosystems of the urban district of Voronezh, 31 invasive species from 30 genera and 19 families were recorded. The method of ecological scales revealed the ecological-coenotic aspects of phytoinvasions. The sample involved geobotanical descriptions (grouped by formational feature) of native phytocenoses without an alien component in the flora and phytocenoses replacing them with the active participation of invasive species within the same research object. Infestations of these species are accompanied by the development of allogeneic successions, which are characterized by a decrease in the species diversity of communities and the role of native taxa in them. The processes of infestations are typical for the region and are observed in communities of floodplain forests and meadows, native and derived forests and sub-forests, broad-leaved and mixed forests, slope meadow and steppes. Plant invasions in the coniferous and deciduous forests of the district are characterized by the expansion of 3 species of woody (Acer negundo, Fraxinus pennsylvanica, Robinia pseudoacacia), 5 species of shrub (Sambucus racemosa, Caragana arborescens Lam., Viburnum lantana, Amelanchier spicata, Parthenocissus quinquefolia) and 4 species of herbaceous plants (Bidens frondosa, Impatiens parviflora, Galinsoga parviflora, Solidago canadensis). Phytoindication of pine forests shows the transformation of all 10 environmental indicators for communities with invasive species. For broad-leaved forests, the introduction of biomorphologically close taxa to native species does not lead to a sharp transformation of the ecological parameters of forest biotopes. The introduction of alien species into alder forests leads to a change in the ecological parameters of their biotopes towards mesophilization. This speeds up the process of the emergence of new alien species from the number of mesophytic taxa and an increase in the role of already settled ones. From 2007 to 2017, the invasive flora of the alder forests of the Voronezh increased from one species to four. According to the degree of invasiveness, the ecosystems of the southern upland, southwest oak forest, northern upland oak forests and pine forests have average values of 6.4 %, 6.1 %, 5.1 %, 5.7 %, respectively. Alder forests are minimally invasive, the share of invasive species is 1.3 %, which does not exceed 5 % of the threshold. Minor changes cover indicators: climate thermal mode (TM), continental climate (KN), climate aridity / humidity (OM), cryoclimatic (CR), soil trophicity (TR), soil acidity (RC), moisture variability (FH). Communities with a high level of participation of invasive species are actively developing in ecotonic conditions: forest edges and alder areas of terraces. As a result of the settlement of alien species in the Alder forests, a decrease in the price activity of the following native species is observed: Impatiens noli-tangere, Humulus lupulus, Solanum dulcamara, Thelypteris palustris, Paris quadrifolia, Maianthemum bifolium. To warn of the possible expansion of Acer negundo, Parthenocissus quinquefolia and Galinsoga parviflora, a high water cut regime for alder forests is required. Under the conditions of global and climatic changes, this is a rather complicated task, requiring constant monitoring of the abiotic and biotic components of the forest, as well as the regulation of nature management regimes in the floodplains of small rivers. The implementation of ecological and cenotic strategies for invasive species in forest communities is accompanied by a restructuring of the ecology of biotopes, which is expressed in the transformation of the ecological parameters of pine forests, mesophilization of alder biotopes, increasing the moisture content and richness of oak forests, the emergence of new alien species and reducing the cenotic activity of some native taxa. The most significant changes are subject to parameters: soil moisture (HD), soil nitrogen richness (NT), illumination/shading (LC).

scholarly journals Synanthropization of dendroflora near main roads in Białystok (NE Poland)

2015 ◽  
Vol 38 (1) ◽  
pp. 9-24
Author(s):  
Grażyna Łaska
Keyword(s):  
Native Species ◽  
Abundant Species ◽  
Tilia Cordata ◽  
Acer Platanoides ◽  
Acer Negundo ◽  
Ne Poland ◽  
The Family ◽  
Ligustrum Vulgare ◽  
Historical Origin ◽  
The City

Abstract The aim of the study was to analyze the species composition of the dendroflora near four main roads in the city of Białystok, taking into regard their geographical and historical origin. The wildlife inventory was conducted in the vegetation season of 2011. The inventory revealed presence of a total of 837 trees and bushes representing 36 species and 18 families. The most abundant trees were those from the family Aceraceae (63.8%), while the most abundant bushes were those representing Rosaceae (48.9%). The contribution of native species (65.7%) was found to be about twice as high as that of alien ones (34.3%). The dominant species among the native trees was Acer platanoides L., while the principal bush species was Crataegus monogyna Jacq. The alien tree species were most commonly represented by Acer negundo L., and bushes - by Ligustrum vulgare L. Spontaneously settled trees and bushes were clearly dominant (59.9%) over those originating from plantations (40.1%). Among the native species of local origin, the prevailing species were synanthropic spontaneophytes (52%), including Acer platanoides and Tilia cordata Mill. Anthropophytes were more abundantly represented by diaphytes (22.7%), followed by kenophytes (10.4%). The most abundant species among diaphytes was Ligustrum vulgare, and among kenophytes - Acer negundo.

scholarly journals You Can’t See the Woods for the Trees: Invasive Acer negundo L. in Urban Riparian Forests Harms Biodiversity and Limits Recreation Activity

2019 ◽  
Vol 11 (20) ◽  
pp. 5838 ◽  
Author(s):  
Daria Sikorska ◽  
Piotr Sikorski ◽  
Piotr Archiciński ◽  
Jarosław Chormański ◽  
Richard J. Hopkins
Keyword(s):  
Invasive Species ◽  
Green Infrastructure ◽  
Tree Species ◽  
Riparian Forests ◽  
Public Access ◽  
Ecological Value ◽  
Acer Negundo ◽  
Vistula River ◽  
The Status ◽  
Invasive Tree Species

Public access to high quality green environments has become a key issue for city managers and a matter of environmental justice. Urban pressures on ecosystem remnants may act to favor the expansion of some invasive species in cities. Whilst the negative impacts of invasive species on ecosystem function is well documented, little is known about how invasive species influence the use of green space by people. Here, we examined one of the few remnants of urban riparian forests in Europe, the Vistula river valley in Warsaw, which has recently become an attractive recreation site. Despite their high ecological value, the poplar and willow forests have been increasingly taken over by the invasive tree species Acer negundo. We examined the status of the invasion process and the relationship between recreational ecosystem services and the characteristics of the tree stands—tree species, tree density, and age and NDVI values. We found the willow forest to be more susceptible to invasion by A. negundo than the poplar forest, which was revealed in significantly higher share of the maple individuals and their greater volume per unit area. Ash-leaved maples also prevailed in numbers in younger stands (<10 years) than in older ones. The presence of A. negundo affected biodiversity, resulting in decreased undergrowth density and biodiversity expressed in number of species. The use intensity by the public, assessed on the basis of soil compaction of existing informal tracks, as revealed by GLM analysis, was related to volume of invasive maple and distance from the main track. This study highlights the need to integrate invasive species management into green infrastructure planning and management.

scholarly journals You Can’t See the Woods for the Trees: Invasive Acer negundo L. In Urban Riparian Forests Harms Biodiversity and Limits Recreation Activity

2019 ◽  
Author(s):  
Daria Sikorska ◽  
Piotr Sikorski ◽  
Piotr Archiciński ◽  
Jarosław Chormański ◽  
Richard Hopkins
Keyword(s):  
Invasive Species ◽  
Green Infrastructure ◽  
Tree Species ◽  
Riparian Forests ◽  
Public Access ◽  
Natural Ecosystems ◽  
Ecological Value ◽  
Acer Negundo ◽  
Vistula River ◽  
Invasive Tree Species

Public access to high quality green environments has become a key issue for city managers and a matter of environmental justice. Remnants of natural ecosystems allow citizens a direct contact with nature, but conversely the presence of people contributes further to the existing disturbances. Urban pressures on ecosystem remnants may act to favour the expansion of some invasive species in cities. Whilst the negative impacts of invasive species on ecosystem function is well documented little is known how invasive species influence the use of green spaces by people. Here, we examined one of the few remnants of urban riparian forests in Europe, the Vistula river valley in Warsaw which has recently become an attractive recreation site. Despite their high ecological value, the poplar and willow forests have been increasingly taken over by the invasive tree species Acer negundo. We examined the status of the invasion process and the relationship between recreational ecosystem services and the characteristics of the tree stands &ndash; tree species, tree density and age and NDVI values. We found the willow forest to be more susceptible to invasion by A. negundo than the poplar forest, which was revealed in significantly higher share of the maple individuals and their greater volume per unit area. Presence of A. negundo affected biodiversity resulting in decreased undergrowth density and number of species. The use intensity by the public, assessed on the basis of trampling intensity and the density of existing informal tracks, were negatively correlated to the presence of A. negundo. This study highlights the need to integrate invasive species management into green infrastructure planning and management.

High predatory efficiency and abundance drive expected ecological impacts of a marine invasive fish

2020 ◽  
Vol 637 ◽  
pp. 195-208 ◽  
Author(s):  
EM DeRoy ◽  
R Scott ◽  
NE Hussey ◽  
HJ MacIsaac
Keyword(s):  
Invasive Species ◽  
Native Species ◽  
Ecological Impact ◽  
Marine Species ◽  
Ecological Impacts ◽  
Negative Effects ◽  
Marine Predator ◽  
Eastern Gulf Of Mexico ◽  
Red Grouper ◽  
Per Capita

The ecological impacts of invasive species are highly variable and mediated by many factors, including both habitat and population abundance. Lionfish Pterois volitans are an invasive marine species which have high reported detrimental effects on prey populations, but whose effects relative to native predators are currently unknown for the recently colonized eastern Gulf of Mexico. We used functional response (FR) methodology to assess the ecological impact of lionfish relative to 2 functionally similar native species (red grouper Epinephelus morio and graysby grouper Cephalopholis cruentata) foraging in a heterogeneous environment. We then combined the per capita impact of each species with their field abundance to obtain a Relative Impact Potential (RIP). RIP assesses the broader ecological impact of invasive relative to native predators, the magnitude of which predicts community-level negative effects of invasive species. Lionfish FR and overall consumption rate was intermediate to that of red grouper (higher) and graysby grouper (lower). However, lionfish had the highest capture efficiency of all species, which was invariant of habitat. Much higher field abundance of lionfish resulted in high RIPs relative to both grouper species, demonstrating that the ecological impact of lionfish in this region will be driven mainly by high abundance and high predator efficiency rather than per capita effect. Our comparative study is the first empirical assessment of lionfish per capita impact and RIP in this region and is one of few such studies to quantify the FR of a marine predator.

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