The effect of plant diversity and ground cover onseedling establishment of diplotaxis tenuifolia(l.) dc. in the central anatolian steppe

Download
2021-2-15
Kaplan, Ekin
Invasive exotic plants increasingly pose a threat to native biodiversity in many parts ofthe world. However, they have rarely become successful in Turkey. One hypothesissuggests a highly diverse native flora avoids establishment of any potential invadersthrough intense competition. This hypothesis was tested through an experimentalsetup where a native plant, the Perennial Wall-rocket (Diplotaxis tenuifolia) was usedto emulate an invasion at its early stages.D. tenuifoliais a cosmopolitan floweringplant native to parts of North Africa, West Asia and Europe, and considered to beinvasive in regions such as Australia, Argentina and North America. The study tookplace at METU where ungrazed pockets of typical of Central Anatolian Steppe re-main. The experimental setup involved varying levels of reduced species richnessand/or ground cover through manipulation of the local vegetation, followed by trans-planting the “invader” species and then recording its fate as a function of native plantdiversity. Survival rates ofD. tenuifoliaseedlings were found to be significantly dif-ferent, but showed weak effects for plots with varied levels of species richness andground cover. At the end of the experiment, survival rates ofD. tenuifoliaseedlings in low, middle and high species richness categories was observed as %15.74, %18.83,and %16.36, respectively; and survival rates of low, middle and high cover categorieswas observed as %17.90, %20.68, and %12.34, respectively. This is the first studythat explores conditions for invasiveness in Turkey. While this study does not confirmour main hypothesis, it paves the way for future research on explaining why invasiveplant species are not successful in Turkey.

Suggestions

An appraisal of biodiversity monitoring in Turkey within the framework of essential biodiversity variables
Demirbaş Çağlayan , Semiha; Bilgin, Cemal Can; Zeydanlı, Uğur Siyami; Department of Earth System Science (2020-9)
The survival of species, habitats, ecosystems and thus the welfare of humankind are increasingly under threat due to adverse effects of land use change, overexploitation, pollution, invasive species and climate change. Monitoring biodiversity, understanding environmental responses and analyzing trends enable us to develop urgent actions for combatting biodiversity decline, and to improve policies to cope with these global challenges. Biodiversity observation has a long history. However the dispersed s...
The Dilemma of Species Protection in Action
Demirbaş Çağlayan, Semiha; Bilgin, Cemal Can (null; 2018-07-20)
Species action plans (SAPs) can be effective tools in nature conservation. These guideline documents inform the status and threats of species and their habitats, and they identify and prioritize actions to enhance the species populations. They both disseminate and make use of useful relevant information by involving local stakeholders, natural resource managers, conservationists and decision makers. The Turkish Ministry of Forestry and Water Affairs aims to complete 100 SAPs between 2013 and 2023. Until mid...
Effects of climate change on biodiversity: a case study on four plant species using distribution models
Beton, Damla; Bilgin, Cemal Can; Department of Biology (2011)
Conservation strategies are mainly focused on species existing in an environment shaped by natural and anthropogenic pressures. Yet, evidence shows that climate is changing faster than ever and expected to continue to change in the near future, which can be devastating for plants with restricted ranges. Turkey harbors many endemic species that might be affected from these changes. However, available data is scarce and biased, complicating the anticipation of future changes. Aim of this study is to improve o...
Non-native Fish Occurrence and Biomass in 1943 Western Palearctic Lakes and Reservoirs and their Abiotic and Biotic Correlates
Trochine, Carolina; Brucet, Sandra; Argillier, Christine; Arranz, Ignasi; Beklioğlu, Meryem; Benejam, Lluis; Ferreira, Teresa; Hesthagen, Trygve; Holmgren, Kerstin; Jeppesen, Erik; Kelly, Fiona; Krause, Teet; Rask, Martti; Volta, Pietro; Winfield, Ian J.; Mehner, Thomas (2018-04-01)
Invasion of non-native species is considered a major threat to global biodiversity. Here we present a comprehensive overview of the occurrence, richness and biomass contribution of non-native fish species in 1943 standing water bodies from 14 countries of the Western Palearctic, based on standardised fish catches by multi-mesh gillnetting. We expected strong geographical gradients to emerge in the occurrence of non-natives. We further hypothesised that the contribution by non-natives to the local fish commu...
Regional peculiarities of community-wide trophic cascades in strongly degraded Black Sea food web
Oguz, Temel; Salihoğlu, Barış; Moncheva, Snejana; Abaza, Valeria (2012-04-01)
The community-wide trophic cascade due to collapsed fish stocks and population outburst of invasive predators after the early 1990s resulted in different pelagic and benthic food web structures in the Black Sea. The northeastern region assumed their most simplified forms characterized by increasing mesozooplankton and polychaete biomass. The ecological degradation is more severe in the northwestern part, whereas the southern basin maintains an anchovy fishery under relatively weak gelatinous predation.
Citation Formats
E. Kaplan, “The effect of plant diversity and ground cover onseedling establishment of diplotaxis tenuifolia(l.) dc. in the central anatolian steppe,” M.S. - Master of Science, Middle East Technical University, 2021.