scholarly journals Remotely-sensed vegetation greening along a restoration gradient of a tropical forest, Kibale National Park, Uganda

2021 ◽  
Author(s):  
Anu Valtonen ◽  
Eveliina Korkiatupa ◽  
Sille Holm ◽  
Geoffrey Malinga ◽  
Ryosuke Nakadai
Keyword(s):  
Seasonal Variation ◽  
Tropical Forest ◽  
Forest Restoration ◽  
National Park ◽  
Forest Regeneration ◽  
Vegetation Index ◽  
Remotely Sensed ◽  
Kibale National Park ◽  
Forest Recovery ◽  
Primary Forest

Restoration has now emerged as a global priority, with international initiatives such as the “UN Decade on Ecosystem Restoration (2021-2030)”. To fulfil the large-scale global restoration ambitions, an essential step is the monitoring of vegetation recovery after restoration interventions. The aim of this study was to evaluate the utility of remotely-sensed vegetation indices, Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI), to monitor the rate of forest regeneration across a tropical forest restoration project area in Kibale National Park, Uganda. As a result, we observed non-linear patterns in NDVI and EVI across the first 25 years of recovery. Both NDVI and EVI increase for the first 10 years of forest regeneration. This “greening” phase could be used as the indicator of successful onset of forest recovery. In particular, the decline of elephant grass, which suppresses the natural regeneration of trees in our area, can be detected as an increase in NDVI. Primary forests differed from the 25-year-old regenerating forests based on the unique combination of low mean and low seasonal variation in EVI. Our results, therefore, suggest that the long-term success of forest restoration could be monitored by evaluating how closely the combination of mean, and degree of seasonal variation in EVI, resembles that observed in the primary forest.

scholarly journals Remotely sensed vegetation greening along a restoration gradient of a tropical forest, Kibale National Park, Uganda

2021 ◽  
Author(s):  
Anu Valtonen ◽  
Eveliina Korkiatupa ◽  
Sille Holm ◽  
Geoffrey M. Malinga ◽  
Ryosuke Nakadai
Keyword(s):  
Tropical Forest ◽  
National Park ◽  
Remotely Sensed ◽  
Kibale National Park

Intensive tree planting facilitates tropical forest biodiversity and biomass accumulation in Kibale National Park, Uganda

2011 ◽  
Vol 261 (3) ◽  
pp. 703-709 ◽  
Author(s):  
Patrick A. Omeja ◽  
Colin A. Chapman ◽  
Joseph Obua ◽  
Jeremiah S. Lwanga ◽  
Aerin L. Jacob ◽  
...  
Keyword(s):  
Tropical Forest ◽  
National Park ◽  
Biomass Accumulation ◽  
Tree Planting ◽  
Kibale National Park ◽  
Forest Biodiversity

Recovery of tree and mammal communities during large-scale forest regeneration in Kibale National Park, Uganda

Biotropica ◽  
2016 ◽  
Vol 48 (6) ◽  
pp. 770-779 ◽  
Author(s):  
Patrick A. Omeja ◽  
Michael J. Lawes ◽  
Amélie Corriveau ◽  
Kim Valenta ◽  
Dipto Sarkar ◽  
...  
Keyword(s):  
National Park ◽  
Forest Regeneration ◽  
Large Scale ◽  
Kibale National Park ◽  
Mammal Communities

scholarly journals Trade-driven trapping dampens the biodiversity benefits of forest restoration in Southeast Asia

2021 ◽  
Author(s):  
H S Sathya Chandra Sagar ◽  
James J Gilroy ◽  
Tom Swinfield ◽  
Ding Li Yong ◽  
Elva Gemita ◽  
...  
Keyword(s):  
Southeast Asia ◽  
Tropical Forest ◽  
Forest Restoration ◽  
Bird Species ◽  
Forest Degradation ◽  
Forest Recovery ◽  
Avian Community ◽  
Pet Trade ◽  
Tropical Forest Restoration

Tropical forest restoration stands to deliver important conservation gains in lowland Southeast Asia, which has suffered some of the world's highest rates of forest degradation and loss. This promise, however, may be undermined by defaunation driven by ubiquitous wildlife trapping in the region, particularly for forest birds that are part of the multi-million-dollar pet trade. To date, quantification of the impacts of trade-driven trapping on rates of biodiversity recovery from forest restoration has been limited. Here, we use a unique long-term survey dataset to ask how trade-driven trapping may interfere with the expected recovery of avian community under forest restoration, at a flagship ecosystem restoration site in the lowland rainforests of Sumatra, Indonesia. We show that tropical forest restoration is associated with the increases in the abundance of 88% of bird species over time. However, impacts of trapping within more accessible areas of the forest meant that this recovery was dampened for 74% of bird species, relative to levels expected as a result of the magnitude of forest recovery observed. Most species (80%) showed increasingly positive relationships between abundance and site remoteness over the period, a pattern that was found for both species targeted for the pet trade (85% of species) and those trapped opportunistically or as 'bycatch' (78% of species). We emphasize the urgency of tackling the emerging threat of pet trade to Southeast Asia's avian diversity, not least to ensure the effectiveness of efforts towards forest restoration.

scholarly journals Extensive sampling and thorough taxonomic assessment of Afrotropical Rhyssinae (Hymenoptera, Ichneumonidae) reveals two new species and demonstrates the limitations of previous sampling efforts

ZooKeys ◽  
2019 ◽  
Vol 878 ◽  
pp. 33-71 ◽  
Author(s):  
Tapani Hopkins ◽  
Heikki Roininen ◽  
Simon van Noort ◽  
Gavin R. Broad ◽  
Kari Kaunisto ◽  
...  
Keyword(s):  
New Species ◽  
Tropical Forest ◽  
National Park ◽  
Parasitoid Wasp ◽  
Kibale National Park ◽  
Afrotropical Region ◽  
Two New Species ◽  
First Results ◽  
Tropical Areas ◽  
Malaise Traps

Tropical forest invertebrates, such as the parasitoid wasp family Ichneumonidae, are poorly known. This work reports some of the first results of an extensive survey implemented in Kibale National Park, Uganda. A total of 456 individuals was caught of the subfamily Rhyssinae Morley, 1913, which in the Afrotropical region was previously known from only 30 specimens. Here, the six species found at the site are described and the Afrotropical Rhyssinae are reviewed. Two new species, Epirhyssa johanna Hopkins, sp. nov. and E. quaggasp. nov., are described and a key, diagnostic characters, and descriptions for all 13 known Afrotropical species are provided, including the first description of the male of Epirhyssa overlaeti Seyrig, 1937. Epirhyssa gavinbroadi Rousse & van Noort, 2014, syn. nov. is proposed to be a synonym of E. uelensis Benoit, 1951. Extensive sampling with Malaise traps gave an unprecedented sample size, and the method is recommended for other poorly known tropical areas.

scholarly journals SOIL SEED BANK, SEED REMOVAL, AND GERMINATION IN A SEASONALLY DRY TROPICAL FOREST IN VERACRUZ, MEXICO

2014 ◽  
Vol 92 (1) ◽  
pp. 111 ◽  
Author(s):  
Claudia Alvarez-Aquino ◽  
Laura Barradas-Sánchez ◽  
Oscar Barradas-Sánchez ◽  
Guadalupe WILLIAMS-LINERA
Keyword(s):  
Tropical Forest ◽  
Seed Bank ◽  
Forest Regeneration ◽  
Soil Seed Bank ◽  
Germination Percentage ◽  
Dry Forest ◽  
Forest Recovery ◽  
Limiting Factors ◽  
Seed Removal ◽  
Dry Tropical Forest

<p> </p><p><object id="ieooui" classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D"></object><span style="color: black;" lang="EN-US">The soil seed bank has a limited role in the seasonal dry tropical forest regeneration process, but seed removal and germination can also be limiting factors during the early forest recovery. In central Veracruz, Mexico, the soil seed bank was determined en five fallows and two forests. </span><span lang="EN-US">Seed bank decreased from fallow to forest (1303 to 101 seeds m<sup>-2</sup>); herbs and grasses predominated thus the similarity between species composition of seed bank and vegetation was low. Seed removal and germination were evaluated for <span class="hps"><em style="mso-bidi-font-style: normal;">Acacia</em></span><em style="mso-bidi-font-style: normal;"> cochliacantha, Caesalpinia <span class="hps">cacalaco, </span>Ipomoea <span class="hps">wolcottiana </span></em><span class="hps">and <em style="mso-bidi-font-style: normal;">Senna atomaria</em> in contrasting habitats represented by pasture, fallow and forest. Seed removal was determined under treatments of total access, rodent exclosure, and insect exclosure. </span><em style="mso-bidi-font-style: normal;">Caesalpinia </em>(largest seeds) displayed the lowest seed removal (5%), whereas <em style="mso-bidi-font-style: normal;">Senna</em> (63%) and <em style="mso-bidi-font-style: normal;">Ipomoea</em> (29%) displayed the highest. Rodent exclosure reduced seed removal for <em style="mso-bidi-font-style: normal;">Ipomoea </em>(medium-sized seeds); and insect exclosure reduced removal for <em style="mso-bidi-font-style: normal;">Senna</em> and <em style="mso-bidi-font-style: normal;">Acacia</em> (small seeds). With the exception of Senna (18% germination), the scarified seeds displayed the highest germination percentage (53-99%). For all species, germination was higher in forest than in open habitats, only <span class="hps"><em style="mso-bidi-font-style: normal;">Senna</em></span> seeds displayed the lowest germination percentage in the forest habitat. Results suggested that in the dry forest of Veracruz, seed removal may not limit forest regeneration; however seeds must be scarified for use in restoration activities.</span></p><p class="MsoNormal" style="line-height: 200%;"><span style="color: black;" lang="EN-US"> </span></p><p> </p><p> </p>

scholarly journals Sentinel-2 Data in an Evaluation of the Impact of the Disturbances on Forest Vegetation

2020 ◽  
Vol 12 (12) ◽  
pp. 1914 ◽  
Author(s):  
Josef Lastovicka ◽  
Pavel Svec ◽  
Daniel Paluba ◽  
Natalia Kobliuk ◽  
Jan Svoboda ◽  
...  
Keyword(s):  
Bark Beetle ◽  
Satellite Data ◽  
National Park ◽  
Vegetation Index ◽  
Vegetation Indices ◽  
Forest Vegetation ◽  
Forest Recovery ◽  
Vegetation Changes ◽  
Tasseled Cap ◽  
Sentinel 2

In this article, we investigated the detection of forest vegetation changes during the period of 2017 to 2019 in the Low Tatras National Park (Slovakia) and the Sumava National Park (Czechia) using Sentinel-2 data. The evaluation was based on a time-series analysis using selected vegetation indices. The case studies represented five different areas according to the type of the forest vegetation degradation (one with bark beetle calamity, two areas with forest recovery mode after a bark beetle calamity, and two areas without significant disturbances). The values of the trajectories of the vegetation indices (normalized difference vegetation index (NDVI) and normalized difference moisture index (NDMI)) and the orthogonal indices (tasseled cap greenness (TCG) and tasseled cap wetness (TCW)) were analyzed and validated by in situ data and aerial photographs. The results confirm the abilities of the NDVI, the NDMI and the TCW to distinguish disturbed and undisturbed areas. The NDMI vegetation index was particularly useful for the detection of the disturbed forest and forest recovery after bark beetle outbreaks and provided relevant information regarding the health of the forest (the individual stages of the disturbances and recovery mode). On the contrary, the TCG index demonstrated only limited abilities. The TCG could distinguish healthy forest and the gray-attack disturbance phase; however, it was difficult to use this index for detecting different recovery phases and to distinguish recovery phases from healthy forest. The areas affected by the disturbances had lower values of NDVI and NDMI indices (NDVI quartile range Q2–Q3: 0.63–0.71; NDMI Q2–Q3: 0.10–0.19) and the TCW index had negative values (Q2–Q3: −0.06–−0.05)). The analysis was performed with a cloud-based tool—Sentinel Hub. Cloud-based technologies have brought a new dimension in the processing and analysis of satellite data and allowed satellite data to be brought to end-users in the forestry sector. The Copernicus program and its data from Sentinel missions have evoked new opportunities in the application of satellite data. The usage of Sentinel-2 data in the research of long-term forest vegetation changes has a high relevance and perspective due to the free availability, distribution, and well-designed spectral, temporal, and spatial resolution of the Sentinel-2 data for monitoring forest ecosystems.

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