Effect of environmental gradients on tree distribution in lowland dry evergreen forest, northeastern Thailand

2021 ◽  
Vol 55 (5) ◽  
2016 ◽  
Vol 31 (4) ◽  
pp. 836-846 ◽  
Author(s):  
Hiroyuki Sase ◽  
Naoyuki Yamashita ◽  
Jesada Luangjame ◽  
Hathairatana Garivait ◽  
Bopit Kietvuttinon ◽  
...  

1989 ◽  
Vol 5 (2) ◽  
pp. 151-158 ◽  
Author(s):  
Hiroyuki Watanabe ◽  
Sawaeng Ruaysoongnern

ABSTRACTThe density of arboreal arthropods in a dry evergreen forest in Northeastern Thailand was investigated by the insecticide fogging (knockdown) method. Arthropod densities of 256.4 and 140.4 m-2 were recorded in the dry season and 195.2 and 123.1 m-2 in the rainy season. The main orders were Collembola, Thysanoptera, Hymenoptera (mainly Formicidae) and Hemiptera. Distinct differences were not found in the arthropod faunal structure and density between the dry and rainy seasons. However, this fauna is completely eliminated by the clearing and burning of forest for shifting cultivation.The results of an experiment investigating the rate of arthropod fall after application of insecticide are presented and problems concerning the efficiency of the estimation methods used in this study are discussed.


2019 ◽  
Vol 11 (4) ◽  
pp. 13448-13458 ◽  
Author(s):  
Wyatt Joseph Petersen ◽  
Tommaso Savini ◽  
Robert Steinmetz ◽  
Dusit Ngoprasert

The Leopard Cat Prionailurus bengalensis is thought to be Asia’s most abundant wild cat.  Yet, the species’ status is poorly known due to a lack of rigorous population estimates.  Based on the few studies available, Leopard Cats appear to be more abundant in degraded forests, potentially due to increased prey availability.  We conducted camera trap surveys, rodent live-trapping, and spatially-explicit capture-recapture analyses to estimate the density of Leopard Cats within a degraded tropical forest fragment (148km2) in northeastern Thailand.  A total effort of 12,615 camera trap nights across 65km2 of trapping area resulted in at least 25 uniquely identified individuals.  Average rodent biomass (the main prey of Leopard Cats) was highest in the dry evergreen forest (469.0g/ha), followed by dry dipterocarp forest (287.5g/ha) and reforested areas (174.2g/ha).  Accordingly, Leopard Cat densities were highest in the dry evergreen forest with 21.42 individuals/100km2, followed by the reforested areas with 7.9 individuals/100km2.  Only two detections came from the dry dipterocarp forest despite both an extensive survey effort (4,069 trap nights) and available prey.  Although the dipterocarp supported the second highest average rodent biomass, it lacked a key prey species, Maxomys surifer, possibly explaining low encounter rates in that habitat.  Our results provide important baseline information concerning the population status of Leopard Cat in southeastern Asia.  Further, our findings corroborate with other studies that found a tolerance among Leopard Cats for degraded forests, highlighting the potential for forest fragments to serve as long-term conservation areas for the species.


The Condor ◽  
2019 ◽  
Vol 121 (1) ◽  
Author(s):  
Rongrong Angkaew ◽  
Wangworn Sankamethawee ◽  
Andrew J Pierce ◽  
Tommaso Savini ◽  
George A Gale

ABSTRACT Road edges in the temperate zone often negatively affect reproductive success, post-fledging survival, and dispersal of forest birds through processes associated with edge habitats. This pattern is less clear in the tropics due to a lack of studies using natural nests and radio-tagged fledglings as well as an almost complete absence of information on nest and fledgling predators. We investigated the influence of road edge on nest success, post-fledging survival, and dispersal of White-rumped Shama (Copsychus malabaricus) in a dry evergreen forest in northeastern Thailand. One hundred nest boxes were placed in forest interior (≥1,000 m from edge of a 5-lane highway) and 100 near forest edge (≤200 m) to assess nesting success. We radio-tracked 50 fledglings from these boxes, 25 each for edge and interior, for 7 weeks after fledging. Nest success and post-fledging survival were 11.6% and 23.6% higher at the edge versus the interior. Predation had the strongest influence on survival, accounting for 100% of nest and 94% of fledgling mortality. Fledglings used locations with denser understory vegetation cover relative to the available habitat, probably to reduce predation risk. Green cat snake (Boiga cyanea) and northern pig-tailed macaque (Macaca leonina), which likely prefer forest interiors over edges, were the primary predators of nests and fledglings in this landscape. There were no significant differences in timing of dispersal and dispersal distance or dispersal direction in relation to proximity to edge. Our results suggest that the impacts of edge effects on the reproductive success of birds appear to be strongly dependent on the habitat preferences of locally dominant predators. Further research will be needed to identify key predators and broadly assess their foraging behaviors in individual landscapes.


Tropics ◽  
2007 ◽  
Vol 16 (4) ◽  
pp. 323-336 ◽  
Author(s):  
Naoko TOKUCHI ◽  
Muneto HIROBE ◽  
Asami NAKANISHI ◽  
Chongrak WACHIRINEAT ◽  
Hiroshi TAKEDA

Geoderma ◽  
2011 ◽  
Vol 165 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Naoyuki Yamashita ◽  
Seiichi Ohta ◽  
Hiroyuki Sase ◽  
Bopit Kievuttinon ◽  
Jesada Luangjame ◽  
...  

2009 ◽  
Vol 01 (05) ◽  
pp. 325-335 ◽  
Author(s):  
Tatsuhiko NOBUHIRO ◽  
Akira SHIMIZU ◽  
Katsunori TANAKA ◽  
Koji TAMAI ◽  
Naoki KABEYA ◽  
...  

Geoderma ◽  
2008 ◽  
Vol 146 (1-2) ◽  
pp. 94-101 ◽  
Author(s):  
Yasuhiro Ohnuki ◽  
Akira Shimizu ◽  
Sophal Chann ◽  
Jumpei Toriyama ◽  
Chansopheaktra Kimhean ◽  
...  

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