scholarly journals Population density and habitat preferences of the Black-cheeked Ant-tanager Habia atrimaxillaris

2014 ◽  
Vol 25 (3) ◽  
pp. 306-321 ◽  
Author(s):  
JESSICA S. CORNILS ◽  
ISABELL RIEDL ◽  
JULIAN FRICKE ◽  
MORITZ KATZ ◽  
CHRISTIAN H. SCHULZE
Keyword(s):  
Population Density ◽  
Population Size ◽  
National Park ◽  
Forest Cover ◽  
Negative Impact ◽  
Habitat Preferences ◽  
Distance Sampling ◽  
Old Growth ◽  
Lowland Forest ◽  
Old Growth Forest

SummaryThe lowland forest on the southern Pacific slope of Costa Rica has an extremely diverse avifauna, including the Black-cheeked Ant-tanager Habia atrimaxillaris. The only known remaining populations of this highly range-restricted species occur in the areas of Piedras Blancas and Corcovado National Park. It is assumed that the population is decreasing due to habitat loss and fragmentation. We assessed the species’ population density in a part of the Piedras Blancas National Park using distance sampling (in February–April 2009 and November 2010–January 2011) and territory mapping (November 2010–January 2011). We also examined habitat preferences based on vegetation structure at point count locations. Black-cheeked Ant-tanagers were exclusively found in old-growth forest. The species’ likelihood of occurrence at census points increased with forest cover (within a radius of 200 m around census points), canopy closure, and density of trees (with diameter at breast height >10 cm). Average population density estimated by distance sampling was 24–27 individuals per km², which is in accordance with the population size estimated by territory mapping (17–25 birds per km²). Based on these estimates, an overall population size of 12,432–20,720 birds is predicted for the remaining 592 km² lowland forest area of the Golfo Dulce region. The Black-cheeked Ant-tanager was only recorded in old-growth forest, but not in gallery forests embedded in a human-dominated landscape matrix. Since the species appears to avoid forest edges, further forest degradation and fragmentation will have a strong negative impact and should be rapidly reduced by adequate conservation measures.

Pollen productivity estimates from old-growth forest strongly differ from those obtained in cultural landscapes: Evidence from the Białowieża National Park, Poland

The Holocene ◽  
2015 ◽  
Vol 26 (1) ◽  
pp. 80-92 ◽  
Author(s):  
Ambroise G Baker ◽  
Marcelina Zimny ◽  
Andrzej Keczyński ◽  
Shonil A Bhagwat ◽  
Kathy J Willis ◽  
...  
Keyword(s):  
National Park ◽  
Cultural Landscapes ◽  
Old Growth ◽  
Old Growth Forest ◽  
Białowieża National Park ◽  
Pollen Productivity

Population density and habitat preferences of forest duikers in Moukalaba-Doudou National Park, Gabon

2013 ◽  
Vol 48 (2) ◽  
pp. 395-399 ◽  
Author(s):  
Yoshihiro Nakashima ◽  
Eiji Inoue ◽  
Etienne-François Akomo-Okoue
Keyword(s):  
Population Density ◽  
National Park ◽  
Habitat Preferences

scholarly journals Ecology and Conservation of the Endangered Banteng (Bos javanicus) in Indonesia Tropical Lowland Forest

2019 ◽  
Vol 26 (2) ◽  
pp. 68
Author(s):  
Dede Aulia Rahman ◽  
Riki Herliansyah ◽  
Puji Rianti ◽  
Ujang Mamat Rahmat ◽  
Asep Yayus Firdaus ◽  
...  
Keyword(s):  
National Park ◽  
Secondary Forest ◽  
Conservation Status ◽  
Activity Patterns ◽  
Habitat Preferences ◽  
Conservation Strategy ◽  
Ecological Data ◽  
Lowland Forest ◽  
Bos Javanicus ◽  
Distribution Point

Banteng, Bos javanicus, as wild cattle is a vital and importance source of germplasm in Indonesia. Various human activities currently threaten their conservation status. Nonetheless, no long-term monitoring programmes are in place for this species. Using distribution point and statistical analysis based on 46,116 camera trap days from December 2015 to January 2017, we aimed to provide habitat preferences, activity patterns and ecological data for banteng population in Ujung Kulon National Park (UKNP). It is the largest population of banteng in Indonesia and is living in a limited habitat area. According to the best occupancy model, the most suitable areas for this species were the secondary forest located at the center portion of UKNP. The presence of the invasive cluster sugar palm, Arenga obtusifolia, in dry season provides additional alternative food for banteng when its main food is scarcer in the forest. Banteng was cathemeral all year round, with the proportion of cathemeral records and the recording rate did not change with the protection of the level area, moon phase or season. To reduce the probability of encountering predators, banteng avoided the space use of dholes. Selection and avoidance of habitats was stronger than avoidance of the predator activity areas. Habitat competition from domestic cattle which grazed illegally in the national park appears to be a problem to the species since zoonosis appears from domestic cattle to banteng. Therefore, effective law enforcement and an adequate conservation strategy are required to eliminate the impacts of both direct and indirect threats.

scholarly journals Genetic heterogeneity in age classes of naturally regenerated old growth forest of Picea abies (L.) Karst

2014 ◽  
Vol 63 (1-6) ◽  
pp. 185-190 ◽  
Author(s):  
A. Wojnicka-Półtorak ◽  
W. Wachowiak ◽  
W. Prus-Głowacki ◽  
K. Celiński ◽  
A. Korczyk
Keyword(s):  
Picea Abies ◽  
Genetic Heterogeneity ◽  
Haplotype Diversity ◽  
Age Classes ◽  
Geographic Scale ◽  
Old Growth ◽  
Chloroplast Microsatellite ◽  
Lowland Forest ◽  
European Continent ◽  
Old Growth Forest

Abstract The Białowiez·a Primeval Forest is located northeastern Poland. It is one of Europe’s most precious old growth forests in terms of abundance and richness of vegetation, retaining features of a primeval lowland forest which cannot be found anywhere else on the European continent. The aim of the study was to assess the genetic heterogeneity of the naturally regenerated Picea abies population using five chloroplast microsatellite markers. In total, 290 trees representing five age classes were studied. Clear patterns of genetic differentiation in relation to demographic substructuring were found within the population. The class of embryos exhibited the greatest genetic richness as evident from the highest number of alleles and haplotypes, the highest mean number of private alleles and haplotypes and the highest haplotype diversity. In the subsequent age classes, a significant decrease in the level of genetic variation was observed. Our data demonstrate that long-lived, highly outcrossing tree species growing in continuous stands can be genetically heterogeneous on a small geographic scale. The heterogeneity is related to age structure and it is likely due to the underlying mating system and selection processes.

Deforestation and forest regeneration following small-scale gold mining in the Amazon: the case of Suriname

2001 ◽  
Vol 28 (2) ◽  
pp. 117-126 ◽  
Author(s):  
Garry D. Peterson ◽  
Marieke Heemskerk
Keyword(s):  
Gold Mining ◽  
Forest Cover ◽  
Qualitative Interviews ◽  
Gold Rush ◽  
Forest Recovery ◽  
Small Scale ◽  
Old Growth ◽  
Mining Sites ◽  
Mining Areas ◽  
Old Growth Forest

Despite scientific concern about Amazon deforestation and the impacts of the Amazon gold rush, few researchers have assessed the long-term impacts of small-scale gold mining on forest cover. This study estimates deforestation from gold mining and analyses the regeneration of abandoned mining areas in the Suriname Amazon. Fieldwork in December 1998 included observations and ecological measurements, as well as qualitative interviews with local miners about mining history and technology. Vegetation cover of abandoned mining sites of different ages was compared with that in old-growth forest. By present estimates, gold miners clear 48–96 km2 of old-growth forest in Suriname annually. Based on different assumptions about changes in technology and the amount of mining that takes place on previously mined sites, cumulative deforestation is expected to reach 750–2280 km2 by 2010. Furthermore, the analysis of abandoned mining sites suggests that forest recovery following mining is slow and qualitatively inferior compared to regeneration following other land uses. Unlike areas in nearby old-growth forest, large parts of mined areas remain bare ground, grass, and standing water. The area deforested by mining may seem relatively small, but given the slow forest recovery and the concentration of mining in selected areas, small-scale gold mining is expected to reduce local forest cover and ecosystem services in regions where mining takes place.

Population Density and Habitat Preferences of Forest Duikers in Moukalaba-Doudou National Park, Gabon

2013 ◽  
Vol 48 (2) ◽  
pp. 395-399 ◽  
Author(s):  
Yoshihiro Nakashima ◽  
Eiji Inoue ◽  
Etienne-François Akomo-Okoue
Keyword(s):  
Population Density ◽  
National Park ◽  
Habitat Preferences

New and interesting lichen records from old-growth forest stands in the German National Park Bayerischer Wald

Nova Hedwigia ◽  
2002 ◽  
Vol 74 (1-2) ◽  
pp. 25-49 ◽  
Author(s):  
Christian Printzen ◽  
Josef Halda ◽  
Zdeněk Tønsberg Palice
Keyword(s):  
National Park ◽  
Forest Stands ◽  
Old Growth ◽  
Old Growth Forest

Detecting changes in the state of reindeer pastures in northernmost Finland, 1995–2005.

Polar Record ◽  
2011 ◽  
Vol 48 (1) ◽  
pp. 74-82 ◽  
Author(s):  
Alfred Colpaert ◽  
Jouko Kumpula
Keyword(s):  
Remote Sensing ◽  
Forest Cover ◽  
Grid Cell ◽  
The State ◽  
Ancillary Data ◽  
Old Growth ◽  
Field Methods ◽  
Old Growth Forest ◽  
Management Area ◽  
In The Beginning

ABSTRACTThe state of pastures in the Finnish reindeer management area has been monitored since 1995 using remote sensing and field inventory. The first inventory was made in 1995–1996, updated in the beginning of 2000s and repeated in 2005–2008. By comparing results from 1995–1996 and 2005–2008 we can observe clear changes in forest cover, structure and ground lichen abundance. To evaluate pasture/vegetation changes on the basis of separate classifications we have used a grid approach. By implementing a 500 by 500 m grid network and summarizing pasture classes for every grid cell we can visualize and quantify intensity of change. By comparing 1995–1996 and 2005–2008 we can see a clear decrease in the number of cells classified old growth dominated forest, and also an increase of fragmentation can be detected. With a 7.5 ha threshold the amount of old growth forest was reduced by 5%, for 20 ha the decrease was 21%. This indicates a significant change in forest landscape structure, fragmentation and reduction of reindeer winter pasture value in large areas. Pixel wise comparison showed no substantial changes in pasture areas. There is a degree of uncertainty in change detection; changes in remote sensing instrument, changes in processing software and methodology, changes in field methods and ancillary data, and obviously also bias introduced by differences between analysts. When comparing reindeer lichen biomass between 1995–1996 and 2005–2008 on the basis of field site data, the measured lichen biomass has declined in 19 out of the 20 reindeer management districts. Only one district showed slight improvement, in three districts there was a notable drop in lichen biomass, from over 1500 kg/ha to about 500 kg/ha. Also amount of arboreal lichens declined due to felling of old growth forest, confirming the findings on the grid cell level. Consequently grass, shrub and sapling stands increased as felled areas start to grow graminoids and herbs.

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