Diversity and abundance of birds in Reiek Biodiversity Spot, Mizoram, northeastern India

Birds are one of the best-known classes of living organisms, they are important bioindicators of an ecosystem. This study was undertaken to determine the diversity and abundance of birds in Reiek Biodiversity Spot, Mizoram, northeastern India. Intensive study was conducted from January to March 2019 by line transect method. A total of 117 species of birds belonging to 37 families and 10 orders were recorded and the Shannon-Wiener diversity index was calculated (H'= 3.85). Family Muscicapidae dominated the area comprising of 16 species, followed by Timaliidae with 6 species. Among all the species recorded, Alcippe nipalensis has the highest relative abundance (13.35%), followed by Staphida castaniceps (Striated Yuhina) and Zosterops palpebrosus (Oriental White Eye) with 8.60% and 6.03% each. Family-wise relative abundance revealed that Pycnonotidae has the highest relative abundance (17.45%), followed by Sylviidae (15.91%) and Timaliidae (13.35%). The area supports a rich and diverse avian community, therefore, recommended better management of the entire landscape.

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Birds species composition and abundance of a relativelly undisturbed vegetation at Mount Pati, Lokoja, Kogi State

Brazilian Journal of Biological Sciences ◽

10.21472/bjbs.061225 ◽

2019 ◽

Vol 6 (12) ◽

pp. 271-282

Author(s):

Dauda Tanko ◽

Rita Chinweuba

Keyword(s):

State Government ◽

Diversity Index ◽

Anthropogenic Activities ◽

Bird Species ◽

Activity Level ◽

Line Transect ◽

Biological Factors ◽

Wet Season ◽

Fuel Wood ◽

Wiener Diversity Index

Avifauna of a relatively undisturbed vegetation at Mount Patti of Lokoja was surveyed from January to June, 2018. Line transect and point count techniques were used for data collection. This was done by weekly visits to the site between 6:00 h and 10:00 h of the day. Bird identification was done with the aid of a pair of binoculars, Field Guide of birds of western Africa and recorded bird calls. Monthly variation and season variation in bird composition and abundance were compared using Shannon-Wiener diversity index and equitability index. There were 39 species in 21 families encountered during the survey. The Family Nectarinidae had the highest number of 5 species, followed by Columbidae and Estrildidae with 4 species each. A total of 1,148 individuals were encountered during the six months survey with village weaver having the highest encountered rate of 107 while yellow-throated Long-claw had the least encountered rate of 4 individuals. Fluctuation was observed in the monthly encountered rate of the birds. Diversity and equitability indices had their highest values of 5.24 and 1.51 in January. More birds (696) were encountered in the wet season than the dry season (452). Four species were seen only in the wet season. Species effort curve showed that there are more species to be discover. The number of species encountered in this study revealed that the mountain is rich composition of bird species, even though the site seems to favour species that show preference to disturbed areas. The on-going anthropogenic activities probably paved way to these species to move in. Monthly and seasonal fluctuation of bird species diversity and abundance may be due to a combination of physical and biological factors. The physical and biological factors observed at the site which we speculate could be reasons for the observed fluctuations include slash and burnt system of farming, fuel-wood harvesting, intensive sporting activities creation of foot paths etc. High encountered rate indicate abundance and high activity level of the species. The village weaver was the most encountered species probably because they are known to be lousy, move in flocks and breed in colonies. In view of the rich composition and abundance of bird species on Mount Patti and the site being a suitable breeding site for the weavers. We recommend further study of the place as there are yet more species to be discovered as indicated by the species effort curve. There is need for conservation procedures to be initiated at the place and this study should serve as a baseline to initiate such programme by the state government.

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Vegetation structure and floristic composition of tree species in the habitat of Scaphium macropodum in Gunung Leuser National Park, Sumatra, Indonesia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d210720 ◽

2020 ◽

Vol 21 (7) ◽

Author(s):

ARIDA SUSILOWATI ◽

DENI ELFIATI ◽

HENTI HENDALSTUTI RACHMAT ◽

KUSUMADEWI SRI YULITA ◽

ADI NURUL HADI ◽

...

Keyword(s):

Tree Species ◽

Vegetation Structure ◽

National Park ◽

Diversity Index ◽

Good Condition ◽

Floristic Composition ◽

Line Transect ◽

Growth Stages ◽

Limited Information ◽

Wiener Diversity Index

Abstract. Susilowati A, Elfiati D, Rachmat HH, Yulita KS, Hadi AN, Kusuma YS, Batu SAL. 2020. Vegetation structure and floristic composition of tree species in the habitat of Scaphium macropodum in Gunung Leuser National Park, Sumatra, Indonesia. Biodiversitas 21: 3025-3033. Scaphium macropodum (Miq.) Beumee Ex K Heyne is a member of Malvaceae tree species and globally recognized as malva nut and locally known as ‘kembang semangkok’, ‘tempayang’, ‘merpayang’ or ‘kepayang’. The nut of S. macropodum has many benefits for medicinal purposes, yet destructive extraction of this tree species has led them to extinction. Among its natural distribution in Indonesia, North Sumatra Province, Indonesia is known as its original range, but there is limited information about the existence of this species. This study aimed to determine the vegetation structure of some tree species in the habitat of S. macropodum in Sikundur, Gunung Leuser National Park, Sumatra, Indonesia. Purposive sampling technique was employed by creating line transect at some forest areas where the population of S. macropodum is known to grow naturally. Four line transects with each transect consisting of five plots with nested plots within were established to record data at four growth stages, resulting in 80 plots in total. The results showed that the Important Value Index (IVI) of S. macropodum within the floristic community at the studied area was 21.98, 13.85, 27.30, and 39.60 for tree, pole, sapling, and seedlings stages, respectively. The Shannon-Wiener Diversity Index (H) were 3.80, 3.70, 3.06 and 2.45, Index of evenness (E) are 0.94, 0.92, 0.86, 0.77 and the Index of Richness (R) are 11.76, 10.73, 6.59, 4.10 for tree, pole, sapling, and seedlings stages. This result suggests that the natural population of S. macropodum in Sikundur forest was still in good condition at all stages from tree to seedling.

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Monitoring and Surveillance of Aerial Mycobiota of Rice Paddy through DNA Metabarcoding and qPCR

Journal of Fungi ◽

10.3390/jof6040372 ◽

2020 ◽

Vol 6 (4) ◽

pp. 372

Author(s):

Sara Franco Ortega ◽

Ilario Ferrocino ◽

Ian Adams ◽

Simone Silvestri ◽

Davide Spadaro ◽

...

Keyword(s):

Relative Abundance ◽

Diversity Index ◽

Alpha Diversity ◽

Its Region ◽

Rice Paddy ◽

Bipolaris Oryzae ◽

Wiener Diversity Index ◽

Abundant Otus ◽

Dna Metabarcoding ◽

Community Complexity

The airborne mycobiota has been understudied in comparison with the mycobiota present in other agricultural environments. Traditional, culture-based methods allow the study of a small fraction of the organisms present in the atmosphere, thus missing important information. In this study, the aerial mycobiota in a rice paddy has been examined during the cropping season (from June to September 2016) using qPCRs for two important rice pathogens (Pyricularia oryzae and Bipolaris oryzae) and by using DNA metabarcoding of the fungal ITS region. The metabarcoding results demonstrated a higher alpha diversity (Shannon–Wiener diversity index H′ and total number of observed species) at the beginning of the trial (June), suggesting a higher level of community complexity, compared with the end of the season. The main taxa identified by HTS analysis showed a shift in their relative abundance that drove the cluster separation as a function of time and temperature. The most abundant OTUs corresponded to genera such as Cladosporium, Alternaria, Myrothecium, or Pyricularia. Changes in the mycobiota composition were clearly dependent on the average air temperature with a potential impact on disease development in rice. In parallel, oligotyping analysis was performed to obtain a sub-OTU identification which revealed the presence of several oligotypes of Pyricularia and Bipolaris with relative abundance changing during monitoring.

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Keanekaragaman dan Kerapatan Jenis Mangrove di Desa Kase Kecamatan Leksula Kabupaten Buru Selatan

BioWallacea : Jurnal Penelitian Biologi (Journal of Biological Research) ◽

10.33772/biowallacea.v7i1.11036 ◽

2020 ◽

Vol 7 (1) ◽

pp. 1055

Author(s):

Efraim Samson ◽

Vergenia Sigmarlatu ◽

Deli Wakano

Keyword(s):

Diversity Index ◽

Line Transect ◽

Mangrove Species ◽

Mangrove Area ◽

Rhizophora Apiculata ◽

Index Analysis ◽

Sonneratia Alba ◽

Bruguiera Gymnorhiza ◽

Density Values ◽

Line Transect Method

This study aims to determine the diversity and density of mangrove vegetation in Kase Village, Leksula Subdistrict, South Buru Regency. The study uses the line transect method with several observation plots that are stratified. A total of 20 transects were placed at the study site with the size of each plot, namely for seedling level, which is 2 x 2 m, while for the level of a sapling, namely 5 x 5 m and for the level of trees, which is 10 x 10 m. The results showed that in the mangrove area in Kase Village, Leksula Subdistrict, South Buru Regency, 3 mangrove species were found, namely Rhizophora apiculata, Bruguiera gymnorhiza, and Sonneratia alba, which belong to two families (Rhizophoraceae, Sonneratiaceae) and 3 genera, (Rhizophora, Bruguiera, Sonneratia). The total number of mangrove individuals, that is 699 individuals from 419 levels of seedlings, 116 levels of a sapling, and 164 levels of trees. The species with the highest density and relative density values at the level of tree growth, namely Rhizophora apiculata, and at the level of sapling and seedlings, namely Bruguiera gymnorhiza. While Sonneratia alba, tends to have density values and species densities that tend to be low at all three growth rates. Furthermore, the results of the diversity index analysis in the mangrove area of Kase Village, Leksula Subdistrict, South Buru Regency, showed that the diversity of species (H´) mangroves for each growth level was 0.76 (seedlings); 0.82 (sapling); and 1.02 (trees), or classified as low to moderate category. Keywords: Mangrove, Diversity, Abundance, Kase Village Abstrak Penelitian ini bertujuan untuk mengetahui keanekaragaman dan kerapatan jenis vegetasi mangrove di Desa Kase, Kecamatan Leksula Kabupaten Buru Selatan. Penelitian menggunakan metode line transect dengan beberapa plot pengamatan yang dibuat bertingkat. Sebanyak 20 transek ditempatkan pada lokasi penelitian dengan ukuran plot masing-masing, yakni untuk tingkat semai, yakni 2 x 2 m, sedangkan untuk tingkat anakan, yakni 5 x 5 m dan untuk tingkat pohon, yakni 10 x 10 m. Hasil penelitian menunjukkan bahwa pada area mangrove di Desa Kase Kecamatan Leksula Kabupaten Buru Selatan, ditemukan 3 spesies mangrove yakni Rhizophora apiculata, Bruguiera gymnorhiza, dan Sonneratia alba, yang tergolong ke dalam dua family (Rhizophoraceae, Sonneratiaceae) dan 3 genus, (Rhizophora, Bruguiera, Sonneratia). Jumlah total individu mangrove, yakni 699 individu yang terdiri dari 419 tingkat semai, 116 tingkat anakan, dan 164 tingkat pohon. Spesies dengan nilai kerapatan dan kerapatan relatif tertinggi pada tingkat pertumbuhan pohon, yakni Rhizophora apiculata, dan pada tingkat anakan serta semai, yakni Bruguiera gymnorhiza. Sedangkan Sonneratia alba, cenderung memiliki nilai kerapatan dan kerapatan jenis yang cenderung rendah pada ketiga tingkat pertumbuhan tersebut. Kemudian, hasil analisis indeks keanekaragaman di area mangrove Desa Kase Kecamatan Leksula Kabupaten Buru Selatan, menunjukan bahwa keanekaragaman jenis (H´) mangrove untuk masing-masing tingkat pertumbuhan, yakni 0.76 (semai); 0.82 (anakan); dan 1.02 (pohon), atau tergolong kategori rendah hingga sedang. Kata Kunci: Mangrove, Keanekaragaman, Kerapatan, Desa Kase

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Community structure of seaweed beds in Mantehage Island, North Sulawesi, Indonesia

AQUATIC SCIENCE & MANAGEMENT ◽

10.35800/jasm.3.2.2015.14043 ◽

2015 ◽

Vol 3 (2) ◽

pp. 32 ◽

Cited By ~ 1

Author(s):

Hartarto Sormin ◽

Grevo S. Gerung ◽

Unstain N.W.J. Rembet

Keyword(s):

Diversity Index ◽

Current Speed ◽

Line Transect ◽

Caulerpa Racemosa ◽

Dominance Index ◽

Food Industries ◽

North Sulawesi ◽

Speed Range ◽

Line Transect Method ◽

Bahasa Indonesia

Title (Bahasa Indonesia): Struktur komunitas rumput laut di Pulau Mantehage, Provinsi Sulawesi Utara Seaweeds are an important marine resource for coastal community. They are used as medicine, paper materials, biofuel and direct consumption as vegetable or in food industries. Data collection in Mantehage island used Seagrass Watch method combined with line transect method with quadrat. This study found 29 species of seaweeds consisting of 13 species of Chlorophyta, 4 species of Phaeophtya and 12 species of Rhodophyta. Water temperatures ranged from 28–30ºC and pH ranged from 8.14–8.69, while salinity ranged between 30.8–31.9 ppt. Mantehage island waters has 100 % visibility with the current speed range of 30–42 cm/sec. INP of Caulerpa racemosa has the highest value at all sites. Diversity index ranged from 0.799–1.093 considered as low and dominance index ranged between 0.635–0.697 categorized as normal. Eveness index ranged from 0.303–0.365 showing that the seaweed community was under pressures. Rumput laut pada saat ini menjadi komoditas penting bagi masyarakat pesisir. Manfaat rumput laut selain dikonsumsi juga dijadikan sebagai obat, bahan baku kertas dan biofuel. Data di pulau Mantehege dikumpulkan menggunakan metode Seagrass watch yang dikombinasikan dengan metode transek garis dan kuadran. Ditemukan 29 spesies rumput laut yang terdiri dari 13 alga hijau Clorophyta, 4 alga cokelat Phaeyophtya dan 12 alga merah Rhodophyta. Substrat pada lokasi penelitian berupa karang mati dan batu karang. Suhu di perairan Pulau Mantehage di lokasi penelitian berkisar 28–30ºC. pH di lokasi penelitian yaitu 8,14–8,69 dengan salinitas berkisar 30,8–31,9 ppt. Kecerahan di Pulau Mantehege yaitu 100% dan kecepatan arus di kisaran 30–42 cm/detik. Nilai INP Caulerpa racemosa mempunyai nilai tertinggi pada semua lokasi. Indeks Keanekaragaman (H’) pada semua lokasi didapat berkisar 0,799–1,093 yang dikategorikan rendah dan biasa. Nilai Indeks Dominasi (D) pada semua lokasi berkisar antara 0,635–0,697 yang dikategorikan sedang. Indeks Keseragaman (J’) berkisar 0,303–0,365 yang menggambarkan komunitas pada kondisi tertekan.

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KEANEKARAGAMAN KARANG DI ZONA LITORAL PERAIRAN IBOIH KECAMATAN SUKAKARYA KOTA SABANG

BIOTIK: Jurnal Ilmiah Biologi Teknologi dan Kependidikan ◽

10.22373/biotik.v3i1.991 ◽

2017 ◽

Vol 3 (1) ◽

pp. 45

Author(s):

Samsul Kamal ◽

Nursalmi Mahdi ◽

Humaira ,

Keyword(s):

Direct Observation ◽

Littoral Zone ◽

Coral Species ◽

Diversity Index ◽

Line Transect ◽

Destructive Sampling ◽

Line Transect Method ◽

Non Destructive

A research on " Coral Diversity in Iboih Aquatic Littoral Zone at Sukakarya District of Sabang City " has been conductedfrom 25 to 27 of May 2013.This study aims to find out the coral species and its diversity index on Iboih aquatic littoral zone at Sukakarya District of Sabang City. The datawere collected by using direct observation and non- destructive sampling techniquesusing transect methods Quadrat and Line Transect method. Physical andchemical factors were measuredincluding temperature, pH , salinity, brightness and depth.The results showed that there were 38 species out of 14 familia of coral found on Iboih aquatic littoral zone at Sukakaryadistrict of Sabangcity. The diversity Index of coral in Iboih aquatic littoral zone at Sukakarya district of Sabangcitywas high (Ä¤=3.28).

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Keanekaragaman Jenis Burung Pada Perkebunan Kopi di Kecamatan Bener Kelipah Kabupaten Bener Meriah Provinsi Aceh

BIOTIK: Jurnal Ilmiah Biologi Teknologi dan Kependidikan ◽

10.22373/biotik.v1i2.216 ◽

2015 ◽

Vol 1 (2) ◽

pp. 73

Author(s):

Samsul Kamal ◽

Nursalmi Mahdi ◽

Nisfula Senja

Keyword(s):

Diversity Index ◽

Bird Diversity ◽

Line Transect ◽

Coffee Plantation ◽

Point Counts ◽

Aceh Province ◽

Line Transect Method

Penelitian ini bertujuan untuk mengetahui keanekaragaman jenis burung pada perkebunan kopi di Kecamatan Bener Kelipah Kabupaten Bener Meriah Provinsi Aceh. Metode yang digunakan dalam penelitian ini adalah metode titik hitung dengan metode line transek. Populasi dalam penelitian ini adalah burung yang terdapat diseluruh lokasi penelitian, sampel dalam penelitian ini adalah burung yang terdapat pada setiap titik pengamatan. Pengamatannya dilakukan dengan cara melakukan pencatatan jenis burung pada setiap titik pengamatan selama 20 menit. Analisis data dilakukan dengan menggunakan rumus Shannon-Wiener. Hasil penelitian menunjukkan bahwa; jumlah jenis burung yang terdapat pada perkebunan kopi di Kecamatan Bener Kelipah Kabupaten Bener Meriah adalah 12 jenis burung dari 9 familia. Keanekaragaman jenis burung pada perkebunan kopi di Kecamatan Bener Kelipah Kabupaten Bener Meriah tergolong rendah. Hal tersebut ditandai dengan indeks keanekaragaman burung Ä¤= 1, 1958. Melihat keanekaragaman jenis burung yang terdapat di kawasan Kecamatan Bener Kelipah Kabupaten Bener Meriah Provinsi Aceh tergolong rendah, maka perlu dilakukan upaya konservasi dan revegatasi pada kawasan perkebunan kopi sehingga kondisi vegetasi tumbuhan pada kawasan tersebut lebih heterogen sehingga dapat memperbaiki kondisi keanekaragaman burung pada kawasan tersebut. Kata Kunci: Keanekaragaman burung, Perkebunan Kopi dan Kecamatan Bener Kelipah This study aimed at finding out the diversity of birds in coffee plantation in Bener Kelipah Sub district, Bener Meriah Regency of Aceh Province. This study used point counts and line transect method. The population of this study was all birds in the location of the study. The samples were birds found at the observation spots. Observation was conducted by recording all types of bird found at the observation spots for 20 minutes. Data were analyzed by using Shannon-Wiener Formula. The results of the study showed that there were 12 types of bird from 9 families in the coffee plantation of Bener Kelipah Sub district, Bener Meriah Regency. The diversity of birds in the area was in low category since the bird diversity index (Ä¤) was 1, 1958. Therefore, conservation and revegetation are needed in the coffee plantation in order to create more heterogenic vegetation in the area so that it will improve the diversity of birds there. Keywords: Bird, Diversity, Coffee Plantation

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Population Status Studies and Anthropogenic Impact on Birds of Biratnagar Sub-Metropolis

Our Nature ◽

10.3126/on.v10i1.7796 ◽

2013 ◽

Vol 10 (1) ◽

pp. 24-33

Author(s):

Kanchan Jha ◽

Bharat Raj Subba

Keyword(s):

Climate Change ◽

Diversity Index ◽

Anthropogenic Impacts ◽

Anthropogenic Activities ◽

Bird Species ◽

Line Transect ◽

Subtropical Climate ◽

Land Use Pattern ◽

Wiener Diversity Index ◽

Gradual Loss

Birds have always fascinated man by their exquisite coloration. They have their functional role in the ecosystem as potential pollinators and scavengers, indeed rightly called bioindicators. Nepal being a mega diversity centre harbors more than 873 species of birds which amounts to 10% of the world. Recently with increase consciousness for biodiversity census and monitoring, many new species have been added to the list. The subtropical climate and greenery of Biratnagar sub-metropolis provide good habitat for several bird species but in the past three decades drastic changes have taken place in the environment of this place because of anthropogenic activities and climate change. Several commonly visible birds’ species have left to turn out. Habitats of birds have shrunk here in such a way that very limited species of birds have become successful to show their representatives in this situation. Considering gradual loss of habitats because of increasing anthropogenic impacts and climate change, an attempt was made to study the present bird status of Biratnagar- sub metropolis. In twelve months of regular observation, eighty-one species of birds belonging to thirty-three families were recorded. Frequency of bird was counted by line transect method. The main five sites Tintolia- Balwahi (Latitude 26°26'32.4"N and Longitude 087°18'09.4"E), Baijnathpur, Ginaghat (Latitude 26029’59.8”N and Longitude 087017’53.2”E)”, Keshaliyakhola (Latitude 26°27'00"N and Longitude 087014.4’48.5”E), Dudhfarm (Latitude 26029’57.6”N and Longitude 087016’44.5”E) and Old airport (Latitude 26025’40.8”N Longitude 087016’34.3”E) were selected for study. On the basis of feeding habit birds recorded were carnivore 28.38%, omnivore 14.80%, insectivore 40.72%, fructivore 3.70%, grainivore 11.70% and nectivore 1.23%. The Shannon Wiener diversity index in summer and winter were found to be 3.68361 and 4.1328 respectively. The recorded birds were common 59.23%, fairly common 28.38% and 12.34% uncommon. The main causes of declining bird population in Biratnagar were found to have been anthropogenic impacts such as encroachment of habitats and feeding and breeding areas, use of insecticides, change in land use pattern, urbanization, poaching and effect of climate change.DOI: http://dx.doi.org/10.3126/on.v10i1.7796

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Plant diversity in logged over forest in Mahakam Ulu, East Kalimantan, Indonesia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d221115 ◽

2021 ◽

Vol 22 (11) ◽

Author(s):

Adhy widya Setiawan ◽

ALBERTUS TJIU ◽

ARI MEIDIDIT ◽

ISWINANTO ISWINANTO ◽

AMMAR GINANJAR ◽

...

Keyword(s):

Plant Diversity ◽

Diversity Index ◽

Similarity Index ◽

Iucn Red List ◽

Tree Level ◽

Line Transect ◽

Importance Value Index ◽

Importance Value ◽

East Kalimantan ◽

Wiener Diversity Index

Abstract. Setiawan AW, Tjiu A, Meididit A, Iswinanto, Ginanjar A, Atut Y, Agusti R. 2021. Plant diversity in logged over forest in Mahakam Ulu, East Kalimantan, Indonesia. Biodiversitas 22: 4829-4838. A study of flora was conducted in the Ratah Timber concession area. Objectives of this study was to calculate the Importance Value Index (IVI) and identify species diversity in Mahakam Ulu, East Kalimantan. A survey was carried out in 128 plots within 13 transects placed purposively. Vegetation sampling was conducted using line transect and a quadrat method. As many as 530 species belonging to 79 families were found. Of these species, 420 species were found in observation plots with 374 of the species being tree. The most dominant tree species were Endertia spectabilis, Shorea pinanga and Shorea leprosula with IVI of 10.24%, 8.25%, and 6.96%, respectively. In total, 114 species or 21.5% are endemic species of Borneo. The Shannon-Wiener diversity index at tree level was 5.51 and at seedling level was 4.95. The highest Similarity Index was found between transects 23 and 21, meanwhile the lowest was between transects 05 and 15. This study found 61 species which are classified on the International Union for Conservation of Nature (IUCN) Red List (2020-1) as critically endangered (16), endangered (11), and vulnerable (34) species.

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Decline of arable flora diversity in Istria (from the year 2005 to the year 2017)

Zbornik Veleučilišta u Rijeci ◽

10.31784/zvr.6.1.25 ◽

2018 ◽

Vol 6 (1) ◽

pp. 385-398 ◽

Cited By ~ 1

Author(s):

Edita Štefanić ◽

Vesna Kovačević ◽

Slavica Antunović

Keyword(s):

Species Richness ◽

Relative Abundance ◽

Diversity Index ◽

Vascular Plant ◽

Regional Scale ◽

Recent Survey ◽

Row Crops ◽

Mean Values ◽

Wiener Diversity Index ◽

Weed Flora

Changes in floristic composition of weed flora were assessed comparing two phytocoenological surveys carried out during vegetation seasons in 2005 and in 2017 on the Istrian Peninsula. A total of 50 fields (row crops, cereals, alfalfa fields, orchards/vineyards and ruderal areas) were surveyed for each of the sampling time using Braun-Blanquet cover-abundance scale. Altogether 175 vascular plant species were recognized in both investigations. The most abundant species in 2005 were Avena fatua, Setaria verticilata, Lolium multiflorum and Veronica persica. In the recent survey these species became very rare or were even not detected in some habitats. In contrast, some species with very low relative abundance or not recorded in the earlier survey were found abundant in 2017. These are: Pastinaca sativa, Conyza canadensis, Picris echioides, Polygonum aviculare, and Heliotropium europaeum. The species richness was significantly higher in the earlier survey when 143 (82%) weeds were detected compared to only 97 species (55%) found in 2017. Only 64 species were found in both surveys, and these were considered frequent weeds. The comparison of weed communities from the earlier to the recent survey reflects the reduction of the weed flora at the regional scale, as well as at the field scale. The mean values of Shannon-Wiener diversity index were also higher in the earlier period and it decreased over time, particularly in row crops, cereals and ruderal habitats. This decrease was related to decline of species richness, and to the increase in inequality in the relative abundance of species. On the whole, canonical correspondence analysis indicated the major variations in species composition between different habitats.

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