IF 0.7

Tropics Pub Date : 2022-06-01 DOI: 10.3759/tropics.ms21-13

Yuya Ogawa, Resurreccion Bitoon Sadaba, M. Kanzaki

引用次数: 0

New locality and bud growth of the world biggest flower, Rafflesia tuan-mudae, in Naha Jaley, Sarawak, Malaysia 马来西亚沙捞越那哈贾利的世界最大花团花莱佛士的新产地和芽生长

IF 0.7

Tropics Pub Date : 2022-03-01 DOI: 10.3759/tropics.ms21-14

B. Diway, Y. Yasui, H. Innan, Y. Takeuchi

{"title":"New locality and bud growth of the world biggest flower, Rafflesia tuan-mudae, in Naha Jaley, Sarawak, Malaysia","authors":"B. Diway, Y. Yasui, H. Innan, Y. Takeuchi","doi":"10.3759/tropics.ms21-14","DOIUrl":"https://doi.org/10.3759/tropics.ms21-14","url":null,"abstract":"A new Rafflesia population was found in Naha Jaley, Sarawak, in 2012. This study aimed to identify this Rafflesia species and investigate its bud growth. First, we described the flower characteristics and compared them with Rafflesia keithii and R. tuan-mudae, which are candidate species for the flower. Also, we investigated the phylogenetic position of this Rafflesia within Rafflesiaceae using DNA analysis. To estimate bud growth curve, we observed bud development from April 2013 to November 2013 in the field. Based on morphological comparisons and phylogenetic analysis, we confirmed the newly discovered population of the Rafflesia at Naha Jaley was R. tuan-mudae, which is the new locality of the species at the most Eastern side of the known distribution for this species. The results indicated that absolute growth rate was greater in larger buds. We also estimated that it took a year to bloom from the initial bud stage. The mortality in one of our sites was very high, with more than 80 % of buds dead prior to flower opening. This flower would be vulnerable to extinction due to their extraordinary characteristics and anthropogenetic effects. Finally, we discussed how Rafflesia populations in Naha Jaley can be conserved both in-situ and ex-situ.","PeriodicalId":51890,"journal":{"name":"Tropics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44820028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Longitudinal and geographic variations in the green moisture content and basic density of bamboo culm in three species naturally grown in Lombok Island, Indonesia 印度尼西亚龙目岛自然生长的三种竹竿的绿色水分含量和基本密度的纵向和地理变化

IF 0.7

Tropics Pub Date : 2022-03-01 DOI: 10.3759/tropics.ms21-06

Dwi Sukma Rini, F. Ishiguri, I. Nezu, Irwan Mahakam Lesmono Aji, D. Irawati, J. Ohshima, S. Yokota

引用次数: 1

Colony composition and behavioral characteristics of the myrmicine ant, Aphaenogaster rugulosa, an endemic species to Yonagunijima Island, the westernmost point of Japan (Hymenoptera: Formicidae) 日本最西端与那元岛特有种金蚁的种群组成及行为特征(膜翅目:蚁科)

IF 0.7

Tropics Pub Date : 2022-03-01 DOI: 10.3759/tropics.ms21-11

S. Aupanun, W. Jaitrong, F. Ito

引用次数: 0

Effects of host tree size on the species richness and abundance of epiphyte assemblages in a Bornean lowland tropical forest 宿主树大小对婆罗洲低地热带森林附生植物物种丰富度和丰度的影响

IF 0.7

Tropics Pub Date : 2022-03-01 DOI: 10.3759/tropics.ms21-12

N. Komada, T. Itioka, Akira Nakanishi, S. Tagane, Usun Shimizu-Kaya, M. Nakagawa, P. Meleng, R. S. Pungga, M. Kanzaki

{"title":"Effects of host tree size on the species richness and abundance of epiphyte assemblages in a Bornean lowland tropical forest","authors":"N. Komada, T. Itioka, Akira Nakanishi, S. Tagane, Usun Shimizu-Kaya, M. Nakagawa, P. Meleng, R. S. Pungga, M. Kanzaki","doi":"10.3759/tropics.ms21-12","DOIUrl":"https://doi.org/10.3759/tropics.ms21-12","url":null,"abstract":"This study clariﬁed the eﬀects of host tree size on the numbers of epiphyte species and individuals on a tree, based on observation of 122 species and 2,162 individuals of epiphytes on 430 target trees in a Bornean primary lowland dipterocarp forest. We analyzed relationships of the diameter at breast height (DBH) of target host trees with the probability of epiphyte presence, number of epiphyte species on each target tree (species richness), number of epiphyte individuals on each target host tree (abundance), and cumulative number of epiphyte species. The probability of epiphyte presence was estimated by a generalized linear model (GLM) with a logistic distribution to be higher than 50 % on trees with DBH ＞ 40 cm. A GLM with a quasi-Poisson distribution showed that both species richness and epiphyte abundance increased exponentially with DBH. The most rapid increase was found for trees with DBH ＞ 40 cm. Also, about half of all epiphyte species recorded in this study were only found on trees with DBH ＞ 60 cm. These results suggest that in lowland tropical rainforests in the Southeast Asian tropics, large trees play an important role in maintaining the species diversity of epiphyte assemblages by providing them with habitats. Meanwhile, several epiphyte species were found only trees with DBH ≤ 40 cm, suggesting that the small trees also provide essential habitats with such epiphyte species. Primary forests with various sizes of trees are necessary for conservation of the epiphyte assemblages.","PeriodicalId":51890,"journal":{"name":"Tropics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44824243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temporal fluctuation of patchy stomatal closure in leaves of Dipterocarpus sublamellatus at upper canopy in Peninsular Malaysia over the last decade 近十年来马来西亚半岛亚层龙脑香叶片斑片状气孔关闭的时间波动

IF 0.7

Tropics Pub Date : 2021-12-01 DOI: 10.3759/tropics.ms21-05

Mai Kamakura, Y. Kosugi, S. Takanashi, N. Matsuo, A. Uemura, M. Lion

{"title":"Temporal fluctuation of patchy stomatal closure in leaves of Dipterocarpus sublamellatus at upper canopy in Peninsular Malaysia over the last decade","authors":"Mai Kamakura, Y. Kosugi, S. Takanashi, N. Matsuo, A. Uemura, M. Lion","doi":"10.3759/tropics.ms21-05","DOIUrl":"https://doi.org/10.3759/tropics.ms21-05","url":null,"abstract":"In the southeast Asian lowland dipterocarp forest of Peninsular Malaysia (Pasoh Forest Reserve), upper canopy tree species with heterobaric leaves show severe midday depression of net assimilation rate ( A ) accelerated by patchy stomatal closure, although it is still unclear whether it always happens or not. We added the in situ observations at various meteorological conditions over the last decade to evaluate the frequency and environmental conditions of patchy stomatal closure in Dipterocarpus sublamellatus Foxw., an emergent tree with heterobaric leaves through leaf–gas exchange measurements combined with numerical simulations and chlorophyll ﬂuorescence imaging. Our observation revealed that on days with moderate leaf temperature ( ＜ 35 ℃ ) and vapor pressure deﬁcit (VPD), which consist four of nine measurement days during 2003 (cid:514) 2015, uniform stomatal behavior could explain observed A during the day. The patterns of stomatal behavior shifted from ‘ uniform ’ to ‘ patchy ’ even within a day depending on increases in leaf temperature and VPD according to irradiation of sunlight. However, it did not return from ‘ patchy ’ to ‘ uniform ’ once patchy stomatal closure happened in a day.","PeriodicalId":51890,"journal":{"name":"Tropics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46968362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biomass and tree diversity in a fragmented secondary forest in Tanah Laut Regency, South Kalimantan Province, Indonesia 印度尼西亚南加里曼丹省Tanah Laut Regency零星次生林的生物量和树木多样性

IF 0.7

Tropics Pub Date : 2021-11-01 DOI: 10.3759/tropics.ms21-01

Kazuo Tanaka, Y. Morikawa, Y. Nagai, T. Satriadi, H. Fauzi, M. Aryadi, M. Hiratsuka

引用次数: 0

Ratios of phosphatase activity to activities of carbon and nitrogen-acquiring enzymes in throughfall were larger in tropical forests than a temperate forest 热带森林的磷酸酶活性与碳和氮获取酶活性的比值大于温带森林

IF 0.7

Tropics Pub Date : 2021-09-01 DOI: 10.3759/TROPICS.MS21-03

Taiki Mori, Senhao Wang, Kaijun Zhou, J. Mo, Wei Zhang

引用次数: 2

Anatomical observations on pistil morphogenesis and fertilization in salak (Salacca wallichiana C. Mart.) salak（Salaca wallichiana C.Mart.）雌蕊形态发生和受精的解剖学观察

IF 0.7

Tropics Pub Date : 2021-06-01 DOI: 10.3759/TROPICS.MS20-09

H. Matsuda, H. Higuchi, Naoki Miyaji, Masanori Okabe

引用次数: 1

Aboveground biomass and carbon sequestration potential of tea and shade trees in Miang tea gardens, an agroforestry system in Northern Thailand 泰国北部农林业系统Miang茶园中茶叶和遮荫树的地上生物量和碳固存潜力

IF 0.7

Tropics Pub Date : 2021-03-01 DOI: 10.3759/TROPICS.MS20-01

Ayako Sasaki, M. Kanzaki, Keisuke Mochizuki, Chalathon Choocharoen, P. Preechapanya

{"title":"Aboveground biomass and carbon sequestration potential of tea and shade trees in Miang tea gardens, an agroforestry system in Northern Thailand","authors":"Ayako Sasaki, M. Kanzaki, Keisuke Mochizuki, Chalathon Choocharoen, P. Preechapanya","doi":"10.3759/TROPICS.MS20-01","DOIUrl":"https://doi.org/10.3759/TROPICS.MS20-01","url":null,"abstract":"In the mountainous areas of northern Thailand, a tea agroforestry system referred to as the “ miang tea garden ” has been maintained by smallholders for more than a hundred years. To discuss the ecological advantages of the miang tea garden system, we determined the spatial distribution patterns of these gardens and the relationship between shade trees and tea trees, emphasizing their aboveground biomass. We developed an allometric model for estimating the aboveground biomass of the stool-shaped tea trees. The area utilized for tea tree cultivation was approximately 72 % of the total study area, and the remaining 28 % was classified as forest patches or abandoned gardens. In miang tea gardens, trees other than tea trees were used by farmers to moderate the amount of sunlight reaching the tea leaves. Additionally, these trees ensured an alternative source of income for the farmers. However, we suggest that the canopy openness should be maintained at more than 25 % to prevent tea leaf growth inhibition. The carbon content in the miang tea garden system was 45.51 ± 21.68 Mg C ha − 1 , considerably higher than that in other types of upland agriculture. The miang tea garden could represent an efficient land-use system supporting sustainable economic activities in areas with geographical limitations for the of other crops.","PeriodicalId":51890,"journal":{"name":"Tropics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44196292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

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