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Book ; Thesis: Soil organic carbon stocks and changes upon forest regeneration in East Kalimantan, Indonesia

Yassir, Ishak

2012

Author's details	Ishak Yassir
Language	English
Size	IX, 175 S. : graph. Darst., Kt.
Publishing country	Netherlands
Document type	Book ; Thesis
Thesis / German Habilitation thesis	Wageningen, Univ., Diss., 2012
Note	Zsfassung in niederländ. Sprache
HBZ-ID	HT017893195
ISBN	978-90-6464-576-1 ; 90-6464-576-0
Database	Catalogue ZB MED Nutrition, Environment, Agriculture

In stock of ZB MED Bonn / Germany

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138/983	available for loan (reading room)	Freihandmagazin (U1)

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Article ; Online: The Development of Feeding Competence in Rehabilitant Orphaned Orangutans and How to Measure It

Preuschoft, Signe / Marshall, A. J. / Scott, Lorna / Badriyah, Siti Nur / Purba, Melki Deus T. / Yuliani, Erma / Corbi, Paloma / Yassir, Ishak / Wibawanto, M. Ari / Kalcher-Sommersguter, Elfriede

Animals. 2023 June 26, v. 13, no. 13

2023

Abstract: For critically endangered species, restorative conservation becomes increasingly important. Successful re-introduction of rescued wild orangutan orphans requires rehabilitation mimicking maternal rearing in the wild. Feeding competence—what to eat, where ...

Abstract	For critically endangered species, restorative conservation becomes increasingly important. Successful re-introduction of rescued wild orangutan orphans requires rehabilitation mimicking maternal rearing in the wild. Feeding competence—what to eat, where and when to find food—needs to be learned before re-introduction. We observed seven orphans (2–10 years old) for a period of 3 years during their rehabilitation at the Yayasan Jejak Pulang forest school. Of the 111 plant genera eaten by the orphans, 92 percent were known orangutan food plants. Five plant genera were eaten by all orphans in over 90 percent of the months within the observation period. The Fruit Availability Index (FAI) was used to predict which parts of a plant were consumed by the orphans. We found that the orphans ate primarily fruit when the FAI was high, but consumed more young leaves, cambium, and pith when FAI was low. Thus, the orphans exhibited food choices very similar to mature wild orangutans and appropriate to forest productivity. The orphans’ acquisition of feeding competence was facilitated by their immersion into a natural forest environment in combination with possibilities for observational learning from conspecifics as well as caregivers modelling food processing and consumption.
Keywords	Pongo pygmaeus ; cambium ; caregivers ; endangered species ; forests ; fruits ; pith
Language	English
Dates of publication	2023-0626
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article ; Online
ZDB-ID	2606558-7
ISSN	2076-2615
ISSN	2076-2615
DOI	10.3390/ani13132111
Database	NAL-Catalogue (AGRICOLA)

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Book ; Thesis: Soil organic carbon stocks and changes upon forest regeneration in East Kalimantan-Indonesia

Yassir, Ishak

2012

Author's details	Ishak Yassir
Language	English
Size	ix, 175 p. :, ill., maps.
Publisher	s.n.
Publishing place	Wageningen
Document type	Book ; Thesis
Thesis / German Habilitation thesis	Thesis (doctoral)--Wageningen University, 2012
Note	Summary in Dutch. ; Vita. ; "Propositions" ([1] leaf) inserted.
ISBN	9789064645761 ; 9064645760
Database	NAL-Catalogue (AGRICOLA)

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Article: The Development of Feeding Competence in Rehabilitant Orphaned Orangutans and How to Measure It.

Preuschoft, Signe / Marshall, Andrew J / Scott, Lorna / Badriyah, Siti Nur / Purba, Melki Deus T / Yuliani, Erma / Corbi, Paloma / Yassir, Ishak / Wibawanto, M Ari / Kalcher-Sommersguter, Elfriede

Animals : an open access journal from MDPI

2023 Volume 13, Issue 13

Abstract	For critically endangered species, restorative conservation becomes increasingly important. Successful re-introduction of rescued wild orangutan orphans requires rehabilitation mimicking maternal rearing in the wild. Feeding competence-what to eat, where and when to find food-needs to be learned before re-introduction. We observed seven orphans (2-10 years old) for a period of 3 years during their rehabilitation at the Yayasan Jejak Pulang forest school. Of the 111 plant genera eaten by the orphans, 92 percent were known orangutan food plants. Five plant genera were eaten by all orphans in over 90 percent of the months within the observation period. The Fruit Availability Index (FAI) was used to predict which parts of a plant were consumed by the orphans. We found that the orphans ate primarily fruit when the FAI was high, but consumed more young leaves, cambium, and pith when FAI was low. Thus, the orphans exhibited food choices very similar to mature wild orangutans and appropriate to forest productivity. The orphans' acquisition of feeding competence was facilitated by their immersion into a natural forest environment in combination with possibilities for observational learning from conspecifics as well as caregivers modelling food processing and consumption.
Language	English
Publishing date	2023-06-26
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2606558-7
ISSN	2076-2615
ISSN	2076-2615
DOI	10.3390/ani13132111
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Filling a void: Analysis of early tropical soil and vegetative recovery under leguminous, post‐coal mine reforestation plantations in East Kalimantan, Indonesia

Woodbury, David J / Yassir, Ishak / Arbainsyah / Doroski, Danica A / Queenborough, Simon A / Ashton, Mark S

Land degradation & development. 2020 Feb. 28, v. 31, no. 4

2020

Abstract: Land degradation in Borneo, one of the world's richest biodiversity hotspots, is extensive. In East Kalimantan, 5,000,000 ha of land are zoned for surface‐mined coal. Deforestation from this mining threatens biodiversity and results in soil degradation, ... ...

Abstract	Land degradation in Borneo, one of the world's richest biodiversity hotspots, is extensive. In East Kalimantan, 5,000,000 ha of land are zoned for surface‐mined coal. Deforestation from this mining threatens biodiversity and results in soil degradation, erosion, and polluted runoff, all directly impacting human populations. Revegetation methods developed for temperate forests are commonly used globally for mine rehabilitation. However, few empirical studies of native forest restoration as part of mine rehabilitation exist from wet tropical regions. Here, a chronosequence was established to observe forest succession under leguminous plantations at the PT Singlurus Pratama coal mine in East Kalimantan, Indonesia. Soil and natural regeneration data were recorded from samples of ten 20 × 60‐m plots randomly located in plantings aged 2, 7, and, 9 years postmining. Linear models (LMEMs) did not reveal greater soil pH, woody plant diversity, or soil phosphorus and nitrogen in older plantings. Rather, they showed higher soil carbon in older plantings, whereas nitrogen and pH were positively correlated with woody species diversity and abundance. Graminoids were less abundant, but ferns were more abundant in older sites in an ordination analysis. The implications are exotic tree plantations shade‐out competitive understory herbaceous species (such as graminoids), opening growing space for other vegetation. However, the establishment of woody species is spatially limited possibly by differences in soil degradation among sites. Our results suggest that planting leguminous trees alone may not be sufficient to restore native forests, and future management should conserve and facilitate the establishment of tropical forest topsoil.
Keywords	Fabaceae ; chronosequences ; coal ; deforestation ; empirical research ; ferns and fern allies ; forest restoration ; forest succession ; graminoids ; human population ; indigenous species ; land degradation ; land restoration ; linear models ; mined soils ; mining ; natural regeneration ; nitrogen ; ordination techniques ; phosphorus ; plantations ; planting ; reforestation ; runoff ; soil carbon ; soil degradation ; soil pH ; species diversity ; temperate forests ; topsoil ; trees ; tropical forests ; tropical soils ; tropics ; understory ; woody plants ; Borneo ; Indonesia
Language	English
Dates of publication	2020-0228
Size	p. 473-487.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	1319202-4
ISSN	1085-3278
ISSN	1085-3278
DOI	10.1002/ldr.3464
Database	NAL-Catalogue (AGRICOLA)

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In stock of ZB MED Bonn / Germany

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Article: Learning to Be an Orangutan—Implications of Life History for Orangutan Rehabilitation

Preuschoft, Signe / Yassir, Ishak / Putri, Asti Iryanti / Aoliya, Nur / Yuliani, Erma / Badriyah, Siti Nur / Corbi, Paloma / Sugianto, Yoyok / Sitepu, Bina Swastas / Mukhlisi / Kalcher-Sommersguter, Elfriede

Animals. 2021 Mar. 10, v. 11, no. 3

2021

Abstract: Orangutans depend on social learning for the acquisition of survival skills. The development of skills is not usually assessed in rescued orphans’ pre-release. We collected data of seven orphans over an 18-months-period to monitor the progress of ... ...

Abstract	Orangutans depend on social learning for the acquisition of survival skills. The development of skills is not usually assessed in rescued orphans’ pre-release. We collected data of seven orphans over an 18-months-period to monitor the progress of ontogenetic changes. The orphans, 1.5–9 years old, were immersed in a natural forest environment with human surrogate mothers and other orphans. Social interactions deviated significantly from those of wild mother-reared immatures. Infants spent more time playing socially with peers, at the expense of resting and solitary play. Infants were also more often and at an earlier age distant from their human surrogate mothers than wild immatures are from their biological mothers. We found important changes towards an orangutan-typical lifestyle in 4- to 7-year-old orphans, corresponding to the weaning age in maternally reared immatures. The older orphans spent less time interacting with human surrogate mothers or peers, started to use the canopy more than lower forest strata and began to sleep in nests in the forest. Their time budgets resembled those of wild adults. In conclusion, juvenile orphans can develop capacities that qualify them as candidates for release back into natural habitat when protected from humanising influences and immersed in a species-typical environment.
Keywords	Pongo pygmaeus ; canopy ; forests ; habitats ; humans ; immatures ; juveniles ; life history ; lifestyle ; ontogeny
Language	English
Dates of publication	2021-0310
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
Note	NAL-light
ISSN	2076-2615
DOI	10.3390/ani11030767
Database	NAL-Catalogue (AGRICOLA)

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Article: Soil organic matter chemistry changes upon secondary succession in Imperata Grasslands, Indonesia: A pyrolysis–GC/MS study

Yassir, Ishak / Buurman, Peter

Geoderma. 2012 Mar., v. 173-174

2012

Abstract: The chemical composition of soil organic matter (SOM) following secondary succession in Imperata grassland was investigated by Pyrolysis-Gas Chromatography/Mass Spectrometry (GC/MS). We studied 46 samples from different stages of succession using plots ... ...

Abstract	The chemical composition of soil organic matter (SOM) following secondary succession in Imperata grassland was investigated by Pyrolysis-Gas Chromatography/Mass Spectrometry (GC/MS). We studied 46 samples from different stages of succession using plots that last burned 3 and 9years previously, secondary forest (≥15years), primary forest and Acacia mangium plantation (9years). During regeneration of Imperata grasslands the chemical composition of SOM changes considerably. Differences between litters and SOM were larger than within SOM, which is mainly due to a rapid degradation of lignin in the soil. Both litter and SOM under Imperata contain larger amounts of carbohydrates and fewer lignin moieties, aliphatics and N-compounds than those under secondary and primary forest. Nevertheless, SOM degradation under grassland is less efficient because of scarcity of N-compounds. SOM decomposition is most advanced under forest, as indicated by lower amounts of plant derived compounds and higher contribution of microbial matter. Decomposition efficiency appears to be related to SOM chemistry, but more to abundance of N-compounds than to that of potentially recalcitrant compounds. C stocks were linked to decomposition efficiency and litter production.
Keywords	Acacia mangium ; Imperata ; carbohydrates ; carbon sinks ; chemical composition ; chromatography ; forests ; grasslands ; mass spectrometry ; soil ; soil organic matter ; Indonesia
Language	English
Dates of publication	2012-03
Size	p. 94-103.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	281080-3
ISSN	1872-6259 ; 0016-7061
ISSN (online)	1872-6259
ISSN	0016-7061
DOI	10.1016/j.geoderma.2011.12.024
Database	NAL-Catalogue (AGRICOLA)

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Article: Community Perceptions of Impacts of Ecotourism and Its Implications on Ecotourism Development in the Balikpapan Bay, East Kalimantan

Sayektiningsih, Tri / Nugroho, Ardiyanto W. / Yassir, Ishak / Sari, Ulfah K. / Ma’ruf, Amir / Mukhlisi / Surya, Adi / Suryanto

Jurnal Wasian : Wahana Informasi Penelitian Kehutanan (Media for Information in Forestry Research). 2019 June, v. 6, no. 1

2019

Abstract: Understanding local community perceptions towards ecotourism is important since community has a crucial role in determining sustainable ecotourism. This research aimed to identify community perceptions towards impacts of ecotourism as well as to analyse ... ...

Abstract	Understanding local community perceptions towards ecotourism is important since community has a crucial role in determining sustainable ecotourism. This research aimed to identify community perceptions towards impacts of ecotourism as well as to analyse the relationships between perception and ecotourism responsible behaviour. Other goal of this study was to analyse the relationship between ecotourism responsible behaviour and social factors. Data was collected in 4 villages adjacent to the Balikpapan bay, namely Maridan, Telemow, Binuang, and Mentawir. We used the quota technique to sample respondents. For each village, we took 40 respondents randomly. Data was then analysed using descriptive statistics, Spearman correlation, and Kruskal Wallis test. We found that community around the Balikpapan Bay thought that ecotourism was able to bring positive impacts for village and community. A Kruskal Wallis test revealed that there was no significant difference regarding perceptions among 4 villages. We found that there was a correlation between ecotourism responsible behaviour and gender. Implications of community’s perceptions to ecotourism development around the Balikpapan bay were then discussed.
Keywords	Borneo ; descriptive statistics ; ecotourism ; forestry ; gender ; information ; research ; villages
Language	English
Dates of publication	2019-06
Size	p. 57-67.
Publishing place	Balai Penelitian Kehutanan
Document type	Article
ISSN	2502-5198
DOI	10.20886/jwas.v6i1.4666
Database	NAL-Catalogue (AGRICOLA)

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Article: Learning to Be an Orangutan-Implications of Life History for Orangutan Rehabilitation.

Animals : an open access journal from MDPI

2021 Volume 11, Issue 3

Abstract: Orangutans depend on social learning for the acquisition of survival skills. The development of skills is not usually assessed in rescued orphans' pre-release. We collected data of seven orphans over an 18-months-period to monitor the progress of ... ...

Abstract	Orangutans depend on social learning for the acquisition of survival skills. The development of skills is not usually assessed in rescued orphans' pre-release. We collected data of seven orphans over an 18-months-period to monitor the progress of ontogenetic changes. The orphans, 1.5-9 years old, were immersed in a natural forest environment with human surrogate mothers and other orphans. Social interactions deviated significantly from those of wild mother-reared immatures. Infants spent more time playing socially with peers, at the expense of resting and solitary play. Infants were also more often and at an earlier age distant from their human surrogate mothers than wild immatures are from their biological mothers. We found important changes towards an orangutan-typical lifestyle in 4- to 7-year-old orphans, corresponding to the weaning age in maternally reared immatures. The older orphans spent less time interacting with human surrogate mothers or peers, started to use the canopy more than lower forest strata and began to sleep in nests in the forest. Their time budgets resembled those of wild adults. In conclusion, juvenile orphans can develop capacities that qualify them as candidates for release back into natural habitat when protected from humanising influences and immersed in a species-typical environment.
Language	English
Publishing date	2021-03-10
Publishing country	Switzerland
Document type	Journal Article
ISSN	2076-2615
ISSN	2076-2615
DOI	10.3390/ani11030767
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Reliability of Carbon Stock Estimates in Imperata Grassland (East Kalimantan, Indonesia), Using Georeferenced Information

Yassir, Ishak / van Putten, Bram / Buurman, Peter

Soil science. 2012 Jan., v. 177, no. 1

2012

Abstract: Knowledge of the spatial distribution of total carbon is important for understanding the impact of regional land use change on the global carbon cycle. We studied spatial total carbon variability using transect sampling in an Imperata grassland area. ... ...

Abstract	Knowledge of the spatial distribution of total carbon is important for understanding the impact of regional land use change on the global carbon cycle. We studied spatial total carbon variability using transect sampling in an Imperata grassland area. Spatial variability was modeled following an isotropic stationary process with spherical and exponential variogram functions. Range and sill were estimated at 100 m and 82.29 ton ha, respectively. For nugget, sill ratio was estimated at 24%, implying a rather strong spatial dependence. In a subsequent total carbon stock inventory based on the sampling design mentioned above, we applied three types of estimators, namely, “naive average procedure,” “spatial average procedure,” and “spatial optimal procedure.” Estimation of total carbon stock (in ton ha) following naive average procedure (which erroneously ignores the spatial dependence) resulted in a considerably too narrow 95% confidence interval of 37.52 to 39.75, whereas the outcomes using spatial average procedure and spatial optimal procedure were 36.54 to 40.73 and 37.14 to 40.78), respectively, using the spherical model, and 36.63 to 40.64 and 37.07 to 40.64, respectively, using the exponential model. Our research indicated that, when total carbon stock estimation is the main goal, random sampling is optimal, whereas wide design sampling (i.e., shortest distance between sampling locations not less than the range) can be preferred in some cases.
Keywords	Imperata ; carbon ; carbon cycle ; carbon sinks ; confidence interval ; georeferencing ; grasslands ; inventories ; isotropy ; land use change ; models ; soil science ; Borneo ; Indonesia
Language	English
Dates of publication	2012-01
Size	p. 22-30.
Publishing place	Lippincott Williams & Wilkins
Document type	Article
Note	Affiliations: 1Forestry Research Development Agency, Ministry of Forestry of Indonesia. Mr. Ishak Yassir is corresponding author. E-mail: ishak.yassir@wur.nl 2Earth System Science Group, Dept. of Environmental Sciences, Wageningen University, AA Wageningen, the Netherlands. 3Mathematical and Statistical Methods Group, Biometrics, Wageningen University, AC Wageningen, the Netherlands.
ZDB-ID	204569-2
ISSN	0038-075X
ISSN	0038-075X
DOI	10.1097/SS.0b013e3182380208
Database	NAL-Catalogue (AGRICOLA)

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