Calculating landscape diversity with alpha diversity indices

Şentürk, Ö.; Özkan, Kürşad

doi:10.22438/jeb/38/5(si)/gm-09

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…Ormanlarda mevcut bitki tür çeşitliliği üzerinde ise özellikle yetişme ortamı koşullarının önemli etkisinin olduğuna değinilerek, bu konuda yapılacak olan bilimsel çalışmalara ihtiyaç olduğu ifade edilmektedir [7]. Zira konuyla alakalı olarak ülkemizde son yıllarda gerçekleştirilen çalışmaların daha çok alfa çeşitlilik indisleri üzerinden kurgulandığı ve bu çalışmalarda özellikle biyolojik çeşitlilik-yetişme ortamı koşulları arasında önemli ilişkilerin tespit edildiği görülmektedir [8,25]. Fakat konunun önemi ve ülkemizin jeomorfolojik, toprak ve iklim koşulları göz önüne alındığında bu konuda daha fazla çalışma yapılarak, özellikle ormanlarda yüksek çeşitlilik durumuna sahip ya da bu açıdan potansiyel arz eden alanların yetişme ortamı koşullarının tespiti için yapılacak çalışmalara ihtiyaç duyulmaktadır.…”

Section: Sonuçlar Ve Tartışmaunclassified

Sütçüler yöresi karaçam ormanlarında bitki tür çeşitliliği ve yetişme ortamı ilişkileri

Baş¹,

Gülsoy²,

Özkan³

2020

Biological Diversity and Conservation

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This study was routed to analyze the connections between alpha species diversity, species richness and environmental variables of black pine (Pinus nigra Arn. subsp. pallasiana (Lamb.) Holmboe) forests. For this reason, the plant species were recorded by the Braun-Blanquet cover-abundance scale and changed over into fractional values extending from 0-1 in the test territories taken from the common black pine remains in the Sütçüler district. In addition, plant species, the slope position, soil depth, land surface form, soil stoniness were recorded in each sample plots. The maps of elevation, slope, and aspect were acquired from the Digital Elevation Model (DEM) of the region whereas heat and radiation index maps were obtained from aspect and slope maps. Alpha diversity was determined by Shannon, Brillouin, Simpson, and Berger-Parker indices and species richness was determined for each sample plot. To illustrate the connections between all diversity values and ecological site factors in the area, Pearson Correlation Analysis and Principal Component Analysis were implemented. Species diversity resulting from all alpha indices indicated a negative correlation with altitude and percentage of stoniness as a consequence of statistical studies, although it was positively correlated with slope degree and mean temperature levels of the plots As indicated by the outcomes from this investigation, although alpha diversity indices are addressed to natural factors, there is no substantial association between ecological site conditions and species abundance. This has resulted in that the consideration of species richness would not be enough in the studies on the relationship between diversity and the environment. Moreover, the results derived from various diversity indices are slightly different. Hence, it is additionally vital to consider this circumstance in the studies to be carried out.

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Section: Sonuçlar Ve Tartışmaunclassified

Sütçüler yöresi karaçam ormanlarında bitki tür çeşitliliği ve yetişme ortamı ilişkileri

Baş¹,

Gülsoy²,

Özkan³

2020

Biological Diversity and Conservation

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“…Para identificar los servicios ecosistémicos de la artropofauna terrestre, se clasifica a los insectos según su grupo trófico a nivel de familia y a partir de ello se le asigna a un gremio determinado (EFSA, 2016;Sánchez et al, 2019;Greenop et al, 2021). Para estimar la diversidad de estos individuos según su gremio trófico, se realiza la medición de la diversidad alfa utilizando índices comunitarios (Şentürk & Özkan, 2017;Cole et al, 2020).…”

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Toxicity of conventional pesticides on the ecosystem services of terrestrial arthropod fauna in cocoa (Theobroma cacao) cultivation in San Martin, Peru

GARAY-CRISANTO

Sotomayor-Chavez

Alarcón-Iman

et al. 2022

Rev. Soc. Entomol. Arg.

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Toxicity of four pesticides in ecosystem services of terrestrial arthropofauna in cocoa cultivation was evaluated. Cypermethrin (T1), carbofuran (T2), copper oxychloride (T3) and chlorpyrifos (T4) were applied in a cocoa farm in San Martín, Peru. Forty pitfall traps were placed for each treatment to capture terrestrial arthropofauna in four evaluations. It is concluded that the families that presented the greatest abundance of individuals were Formicidae, Entomobryidae and Poduridae. For the global evaluation, significant differences were found in the predators for the specific richness index, being T3 the one that presented the lowest numbers; while for the Margalef index, the lowest value was T3. For the analysis by evaluations, significant differences were found in the detritivores during the second evaluation for the number of individuals, with T4 being the lowest number. Significant differences were also found in the predators during the first evaluation in the Margalef index, with the lowest value being observed in T4. The trophic guild that allowed the most efficient evaluation of the toxicity were the predators, T1 is the most compatible pesticide with the terrestrial arthropods associated with cocoa cultivation, and the alpha diversity indices showed significant differences between the applied pesticides.

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Adapting a multiscale approach to assess the compositional diversity of landscapes

Konrád,

Bede-Fazekas,

Bartha

et al. 2023

Landsc Ecol

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Context The role of landscape diversity and structure is crucial for maintaining biodiversity. Both landscape diversity and structure have often been analysed on one thematic layer, focusing on Shannon diversity. The application of compositional diversity, however, has received little attention yet. Objectives Our main goal was to introduce a novel framework to assess both landscape compositional diversity and structure in one coherent framework. Moreover, we intended to demonstrate the significance of the use of a neutral model for landscape assessments. Methods Both entire Hungary and nine of its regions were used as study areas. Juhász-Nagy’s information theory-based functions, i.e. “compositional diversity” and “associatum”, were introduced and applied in landscape context. Potential and actual landscape characteristics were compared by analysing a probabilistic representation of potential natural vegetation (multiple PNV, MPNV) and actual vegetation (AV), treating MPNV as a neutral model. Results A significant difference was found between the MPNV- and AV-based, maximal compositional diversity estimates. MPNV-based maximal compositional diversity was higher and the maximum appeared at a finer spatial scale. The differences were more prominent in human-modified regions. Associatum implied the spatial aggregation of both MPNV and AV. Fragmentation of AV was indicated by larger units carrying maximal compositional diversity and maximal associatum values. Conclusions Applying the multiscale Juhász-Nagy’s functions to landscape composition allowed more precise characterization of the landscape state than traditional Shannon diversity. Our results underline, that increasingly transformed landscapes host decreasing complexity of vegetation type combinations and increasing grain that carries the richest information on landscape vegetation patterns.

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Calculating landscape diversity with alpha diversity indices

Cited by 5 publications

References 30 publications

Sütçüler yöresi karaçam ormanlarında bitki tür çeşitliliği ve yetişme ortamı ilişkileri

Sütçüler yöresi karaçam ormanlarında bitki tür çeşitliliği ve yetişme ortamı ilişkileri

Toxicity of conventional pesticides on the ecosystem services of terrestrial arthropod fauna in cocoa (Theobroma cacao) cultivation in San Martin, Peru

Adapting a multiscale approach to assess the compositional diversity of landscapes

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