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Mapping the habitat suitability of Ottelia species in Africa

Plant Diversity 2022年第5期44卷 468-480页

作者： Boniface K.Ngarega John M.Nzei Josphat K.Saina Marwa Waseem A.Halmy Jin-Ming Chen Zhi-Zhong Li Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan430074China Center of Conservation Biology Core Botanical GardensChinese Academy of SciencesWuhan430074China University of Chinese Academy of Sciences Beijing100049China Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglun666303China Department of Environmental Sciences Faculty of ScienceAlexandria UniversityAlexandria21511Egypt

Understanding the influence of environmental covariates on plant distribution is critical,especially for aquatic plant *** change is likely to alter the distribution of aquatic ***,knowledge of this change on the burden of aquatic macroorganisms is often fraught with ***,a model genus for studying the evolution of the aquatic family Hydrocharitaceae,is mainly distributed in slow-flowing creeks,rivers,or lakes throughout pantropical regions in the *** to recent rapid climate changes,natural Ottelia populations have declined *** modeling the effects of climate change on the distribution of Ottelia species and assessing the degree of niche similarity,we sought to identify high suitability regions and help formulate conservation *** models use known background points to determine how environmental covariates vary spatially and produce continental maps of the distribution of the Ottelia species in ***,we estimated the possible influences of the optimistic and extreme pessimistic representative concentration pathways scenarios RCP 4.5 and RCP 8.5 for the *** results show that the distinct distribution patterns of studied Ottelia species were influenced by topography(elevation)and climate(e.g.,mean temperature of driest quarter,annual precipitation,and precipitation of the driest month).While there is a lack of accord in defining the limiting factors for the distribution of Ottelia species,it is clear that water-temperature conditions have promising effects when kept within optimal *** also note that climate change will impact Ottelia by accelerating fragmentation and habitat *** assessment of niche overlap revealed that Ottelia cylindrica and *** had slightly more similar niches than the other Ottelia *** present findings identify the need to enhance conservation efforts to safeguard natural Ottelia populations and provide a theoretical basis for the distr

关键词： African freshwater bodies Climate change Ecological niche modeling Habitat suitability niche overlap

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Functional composition of tall-statured trees underpins aboveground biomass in tropical forests

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Journal of Forestry Research 2023年第2期34卷 333-344页

作者： Suwash Kunwar Li-Qiu Wang Maryam Kazempour Larsary Rajeev Chaudhary Puspa Raj Joshi Arshad Ali Department of Forest Resources Management College of ForestryNanjing Forestry UniversityNanjing 210037JiangsuPeople’s Republic of China Forest Ecology Research Group College of Life SciencesHebei UniversityBaoding 071002HebeiPeople’s Republic of China Division Forest Offi ce DadeldhuraMinistry of ForestDhangadhiSudurpashchim ProvinceNepal Department of Forestry Faculty of Natural ResourcesUniversity of Guilan43619-96196 SomehsaraIran Division Forest Offi ce PahalmanpurMinistry of ForestDhangadhiSudurpashchim ProvinceNepal Institute of Forestry Tribhuvan UniversityHetauda CampusHetauda 44107Nepal

The influences of trait diversity(i.e.,the niche complementarity effect)and functional composition(i.e.,the mass ratio effect)on aboveground biomass(AGB)is a highly debated topic in forest ***,further studies are needed to explore these mechanisms in unstudied forest ecosystems to enhance our understanding,and to provide guidelines for specific forest ***,we hypothesized that functional composition would drive AGB better than trait diversity and stem size inequality in the(sub-)tropical forests of *** data from 101 forest plots,we tested 25 structural equation models(SEMs)to link elevation,stem DBH inequality,trait diversity(i.e.,trait richness,evenness,dispersion and divergence),functional composition[i.e.,community-weighted of maximum height mean(CWM of Hmax),specific leaf area(CWM of SLA),leaf dry matter content(CWM of LDMC),and wood density(CWM of WD)]and *** best-fitted SEMs indicated that CWM of Hmax promoted AGB while overruling the impacts of trait diversity indices on ***,low trait diversity indices were linked with higher AGB while overruling the effects of CWM of SLA,LDMC and WD on *** addition,AGB decreased with increasing elevation,whereas stem size inequality did not influence *** results suggest that divergent species’functional strategies could shape AGB along an altitudinal gradient in tropical *** argue that forest management practices should include plant functional traits in the management plan for the co-benefits of biodiversity conservation and carbon sequestration that underpins human wellbeing.

关键词： Functional traits Mass ratio niche complementarity niche overlap Topography

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niches of dominant fish in the waters surrounding the Taishan Islands, China

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Chinese Journal of Oceanology and Limnology 2016年第4期34卷 697-708页

作者：杨璐陈杰杨圣云钟慧琪鞠培龙杨顺良孙芹芹陈明茹 College of Ocean and Earth Sciences Xiamen University Xiamen 361105 China Fujian Institute of Oceanography Xiamen 361013 China Fujian Provincial Key Laboratory of Coast and Island Management Technology Study Xiamen 361013 China

An index of relative importance(IRI) was employed to screen for dominant fish in the waters surrounding the Taishan Islands, China, using data from four seasonal trawl surveys undertaken between 2012 and 2013. niche breadth and niche overlap were measured using the Feinsinger and Morisita-Horn indices, respectively, and the characteristics and seasonal variations in the niches of dominant fish were assessed via non-metric multidimensional scaling(NMDS) and cluster analysis. A total of 80 fish species, including 16 dominant species, were recorded. Only A mblychaeturichthys hexanema was dominant in all seasons. According to niche breadth values and NMDS, the 16 dominant species were grouped into the following three types:(1) wide niche breadth species, including Cynoglossus macrolepidotus, A. hexanema, and Trypauchen vagina, among others;(2) medium niche breadth species, including Setipinna taty and Johnius belangerii; and(3) narrow niche breadth species, including A trobucca nibe and Coilia mystus. Most species with a wider niche breadth were demersal fish with a lower swimming capability and even distribution. The niche breadth of migrating fish was narrower than that of settled fish. At a given spatial scale, fish with stronger swimming capabilities had a narrower niche breadth. niche overlap, which is associated with niche specialization, ranged from 0.000 to 0.886 and had an annual mean value of 0.314. In summer and autumn, niche overlap was relatively high within species of the Sciaenidae family and within species of the Gobiidae in autumn. Dif ferences in thermophily, feeding habits, food organism abundance/distribution and predator-prey relationships af fected the niche overlap of fish in this area. Cluster analysis revealed that species with the narrowest niche breadth and lowest niche overlap values usually displayed lower aggregation and greater distribution dif ferences compared with other species.

关键词： Taishan Islands dominant fish niche breadth niche overlap niche specialization

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Identifying important habitats for waterbird conservation at a Greek Regional Nature Park

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Avian Research 2020年第4期11卷 452-464页

作者： Vasilios Liordos Vasileios J.Kontsiotis Hellenic Forest Service 12 Minoas str19100 MegaraAttikiGreece Department of Forest and Natural Environment Sciences International Hellenic UniversityP.O.Box 17266100 DramaGreece.

Background:Small coastal wetlands are vital sites for wintering *** important habitats is critical for managing waterbirds *** Vourkari inlet is a small coastal wetland located near the capital Athens,within the most urbanized and industrialized area of *** aimed at identifying the most important habitats for waterbirds at the Vourkari inlet during ***:Data about habitat use and availability were collected for 14 waterbird species and for seven habitat *** selection(Manly’s selection ratio),overlap indices(Pianka’s niche overlap index)and null models were ***:All the studied waterbird species selected available habitats *** waters(0–2 m),were used by 13 waterbirds and selected by five *** and channels were used and selected by 10 *** was used by nine species and selected by six *** with rocky substrate was used by nine species and selected by eight ***(2–4 m)and deep(4–6 m)open water habitats were used by seven species and selected by four *** vegetation was used by six species and selected by two *** habitats were selected by nationally important populations:mudflat habitats(i.e.,mud,mud with rocky substrate and pools and channels)by Common Redshanks(Tringa totanus),halophytic vegetation by Little Egrets(Egretta garzetta),shallow waters by Common Shelducks(Tadorna tadorna)and medium and deep waters by Sandwich Terns(Thalasseus sandvicencis),whilst shallow waters and mudflat habitats were preferred by a possibly internationally important population of Mediterranean Gulls(Ichthyaetus melanocephalus).Although overlap in habitat use between species was generally low,null models indicated habitat sharing and a lack of ***:Waterbirds coexisted in the absence of competition for habitats at Vourkari,where they mostly used and preferred shallow water and *** coastal wetlands are numerous,

关键词： Habitat selection Habitat use Mudflats niche overlap Null models Open water Small coastal wetlands

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Diversity analysis of soil dematiaceous hyphomycetes from the Yellow River source area:Ⅰ

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第10期9卷 829-834页

作者： Hao-qin PAN Jin-feng YU Yue-ming WU Tian-yu ZHANG Hong-feng WANG Mycological Laboratory Department of PlantPathology Shandong Agricultural University Tai＇an 271018 China

Twenty-four soil samples of eight ecosystem-types around the Yellow River source area were investigated for the number and specific composition of soil dematiaceous hyphomycetes by dilution plate technique. And then the co-relationship between genus species of soil dematiaceous hyphomycetes and ecosystem-types was analyzed. The results show that the amount and species distribution of soil dematiaceous hyphomycetes had an obvious variability in different ecosystem-types, and that the dominant genus species varied in the eight ecosystem-types studied, with Cladosporium being the dominant genus in seven of the eight ecosystem-types except wetland. The index of species diversity varied in different ecosystem-types. The niche breadth analysis showed that Cladosporium had the highest niche breadth and distributed in all ecosystem-types, while the genera with a narrow niche breadth distributed only in a few ecosystem-types. The results of niche overlap index analysis indicated that Stachybotrys and Torula, Doratomyces and Scolecobasidium, Cladosporium and Chrysosporium had a higher niche overlap, whereas Arthrinium and Gliomastix, Phialophora and Doratomyces, Oidiodendron and Ulocladium had no niche overlap.

关键词： Yellow River source area Ecosystems Fungal species diversity Soil dematiaceous hyphomycetes niche breadth niche overlap

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A niche model to predict Microcystis bloom decline in Chaohu Lake, China

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Chinese Journal of Oceanology and Limnology 2012年第4期30卷 587-594页

作者：汪志聪李钟杰李敦海 Institute of Hydrobiology Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

Cyanobacterial blooms occur frequently in lakes due to eutrophication. Although a number of models have been proposed to forecast algal blooms, a good and applicable method is still lacking. This study explored a simple and effective mathematical-ecological model to evaluate the growth status and predict the population dynamics of Microcystis blooms. In this study, phytoplankton were collected and identified from 8 sampling sites in Chaohu Lake every month from July to October, 2010. The niche breadth and niche overlap of common species were calculated using standard equations, and the potential relative growth rates of Microcystis were calculated as a weighted-value of niche overlap. In July, the potential relative growth rate was 2.79 (a.u., arbitrary units) but then rapidly declined in the following months to -3.99 a.u. in September. A significant correlation (R=0.998, Pniche model, we concluded that the niche model is suitable for forecasting the dynamics of Microcystis blooms. Redundancy analysis indicated that decreases in water temperature, dissolved oxygen and total dissolved phosphorus might be major factors underlying bloom decline. Based on the theory of community succession being caused by resource competition, the growth and decline of blooms can be predicted from a community structure. This may provide a basis for early warning and control of algal blooms.

关键词： Microcystis bloom niche breadth niche overlap predictive model Chaohu Lake

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Stable isotope evidence for trophic niche partitioning in a South African savanna rodent community

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Current Zoology 2015年第3期61卷 397-411页

作者： Jacqueline CODRON Kevin J DUFFY Nico L AVENANT Matt SPONHEIMER Jennifer LEICHLITER Oliver PAINE Paul SANDBERG Daryl CODRON Institute of Systems Science Durban University of Technology Durban South Africa Karoo Palaeontology Deparlnaent National Museum PO Box 266 Bloemfontein 9301 RSA School of Mathematics Statistics and Computer Science University of KwaZulu-Natal Private Bag X01 Scottsville 3209 RSA Denartment of Mammalogv. National Museum. PO Box 266. Bloemfontein 9301. RSA Department of Anthropology University of Colorado at Boulder Boulder CO80309 USA Florisbad Quaternary Research Department National Museum PO Box 266 Bloemfontein 9301 RSA

Species＇ partitioning of resources remains one of the most integral components for understanding community assem- bly. Analysis of stable carbon and nitrogen isotopes in animal tissues has the potential to help resolve patterns of partitioning be- cause these proxies represent the individual＇s diet and trophic niche, respectively. Using free-ranging rodents in a southern Afri- can savanna as a model community, we find that syntopic species within habitats occupy distinct isotope niches. Moreover, spe- cies with strongly overlapping isotope niches did not overlap in their spatial distribution patterns, suggesting an underlying effect of competitive exclusion. niche conservatism appears to characterize the behaviour of most species in our sample - with little or no observed changes across habitats - with the exception of one species, Mastomys coucha. This species displayed a generalist distribution, being found in similar abundances across a variety of habitats. This spatial pattern was coupled with a generalist isotope niche that shifted across habitats, likely in response to changes in species composition over the same spatial gradient. The case for M. coucha supports contentions that past competition effects played a significant evolutionary role in shaping community structures of today, including the absence of strong interspecific niche overlaps within particular habitats. Our study highlights the value of stable isotope approaches to help resolve key questions in community ecology, and moreover introduces novel ana- lytical approaches to quantifying isotope niche breadths and niche overlaps that are easily comparable with traditional metrices

关键词： Competition Diet niche breadth niche overlap Sterkfontein Valley

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The effects of prey depletion on dietary niches of sympatric apex predators in Southeast Asia

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Integrative Zoology 2021年第1期16卷 19-32页

作者： Robert STEINMETZ Naret SEUATURIEN Pairoj INTANAJITJUY Pichet INRUEANG Kittipat PREMPREE World Wide Fund for Nature-Thailand BangkokThailand and 2 Kuiburi National ParkPrachuapkirikhanThailand

Resource depletion exerts opposing pressures on co-occurring consumers to expand diets while limiting overlap with *** foraging theory as a framework,we tested the effects of prey availability on diet spe-cialization and overlap among competing Asian predators:dhole,leopard,and *** used scat analysis from a prey-poor site,combined with a quantitative synthesis of 40 other diet studies,to determine biomass of different prey types consumed by each *** then assessed diet composition in relation to prey density,and compared diet breadth and overlap between prey-poor and prey-rich *** prey rich areas,all three predators specialized on energetically profitable medium and large ungulates(>30 kg),resulting in narrow,overlapping *** predator shifted toward less profitable small-bodied prey(≤30 kg)as preferred ungulates declined,whereas con-sumption of preferred ungulates was unrelated to small prey abundance,as predicted by foraging *** breadths doubled under prey depletion(except leopard),but overlap declined as diets diverged via species-specific traits that facilitated capture of different types of alternative ***’s apex predators adapt similarly to depletion of mutually preferred ungulates by switching to more numerous but less profitable small *** they can also partition a depleted prey base through intrinsic niche differences,thereby avoiding competitive *** find-ings illuminate the stabilizing properties of adaptive foraging and niche differences in ecological communities,and provide insights into the behavior and resilience of Asia’s endangered apex predators in response to prey depletion in the heavily poached forests of this region.

关键词： coexistence dhole leopard niche overlap optimal foraging theory

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Multiple Spatial Scale Analysis of the niche Characteristics of the Rhododendron dauricum Plant Communities in Northeast China

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Chinese Geographical Science 2020年第4期30卷 614-630页

作者： LU Yupeng CHEN Wei YAO Jing HUANG Yanqing ZHANG Yue LIU Huanchu HE Xingyuan Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Shenyang Arboretum Chinese Academy of SciencesShenyang 110016China

This study aims to verify the concept of niches at multiple spatial scales in plant *** this end,we analyzed the niche characteristic of Rhododendron dauricum plant communities in Northeast China at three spatial *** the local scale,we calculated the Importance Value(IV)of species in five communities in the north of the Da Hinggan *** the intermediate scale,we examined five communities in their entirety,calculated the niche breadth of the species,and integrated niche overlap and interspecific association to analyze interspecific ***,the generalized additive model(GAM)was used to analyze the impact of topography and soil factors on niche *** the regional scale,we analyzed the geographical distribution of dominant species of *** plant communities in Northeast China and used principal component analysis(PCA)to analyze the impact of geographical and climate factors on species *** results show that at the local scale,the IV of the species in each community varies *** the intermediate scale,species with a wide niche breadth tend to have a high value for *** gmelinii,Betula platyphylla,***,Ledum palustre,and Vaccinium vitis-idaea had a relatively wide niche breadth and a high niche overlap,and the interspecific associations were almost all *** and soil nutrients were the most dominant environmental *** the regional scale,species with a wide niche breadth tend to have a wide range of distribution,and temperature and precipitation were the most dominant environmental *** study suggests that the niche characteristics at three scales are both related and *** characteristics at the local scale were various and labile,and niche characteristics at the intermediate and regional scales were relatively *** results show some degree of consistency with previous studies from an evolutionary *** action mechanisms of these commu

关键词： niche spatial scale Rhododendron dauricum niche breadth niche overlap interspecific association environmental factor

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