Germination niches and seed persistence of tropical epiphytic orchids in an urban landscape

Izuddin, Muhammad; Yam, Tim Wing; Webb, Edward L.

doi:10.1007/s10265-019-01110-0

Cited by 11 publications

(5 citation statements)

References 70 publications

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“…Furthermore, all species occurred at this elevation range except Paphiopedilum armeniacum, which was distributed within a range of 1696-2024 m (Table S3). The results indicated that ecological preferences and niche breadth vary among species, which is consistent with Tsiftsis et al [51], possibly because orchid germination niches are complex [71]. A better understanding of how niche breadth is associated with environmental gradients is crucial to species conservation, especially when considering the distribution of orchids [72].…”

Section: Conservation Of Brachypetalum Orchids In Southwest Chinasupporting

confidence: 80%

Geographical Distribution and Relationship with Environmental Factors of Paphiopedilum Subgenus Brachypetalum Hallier (Orchidaceae) Taxa in Southwest China

et al. 2021

Diversity

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The determination of the geographic distributions of orchid species and their relationships with environmental factors are considered fundamental to their conservation. Paphiopedilum subgenus Brachypetalum is one of the most primitive, ornamental, and threatened groups of Orchidaceae. However, little is known about the distribution of Brachypetalum orchids and how they are influenced by environmental factors. In this study, we developed a database on the geographical distribution of Brachypetalum orchids based on a large-scale field investigation in the Guangxi, Guizhou, and Yunnan provinces of southwest China (2019–2020). Using this database, we first adopted the nonparametric Mann–Whitney U test to analyze the differences in the geographical distributions and growth environments of Brachypetalum orchids. In addition, we also used the method of principal component analysis (PCA) to explore distribution patterns of Brachypetalum orchids in relation to environmental factors (topography, climate, anthropogenic disturbance, productivity, and soil) in southwest China. Our results indicated that Brachypetalum orchid species were mainly distributed in the karst limestone habitats of southwest China. In general, there were 194 existing localities with the occurrence of seven target orchids in the investigated area. Of the discovered species in our study, 176 locations (~90.7%) were distributed primarily in the karst habitat. Among them, the range of 780–1267 m was the most concentrated elevation of Brachypetalum orchids. In addition, the findings also suggested that the distribution of Brachypetalum orchids in southwest China was relatively scattered in geographical space. However, the density of the distribution of Brachypetalum orchids was high, between 104° and 108° E and between 25° and 26° N. The results of the Mann–Whitney U test revealed that there are obviously different geographical distributions and growth environments of Brachypetalum in southwest China. More specifically, we found some extremely significant differences (p < 0.001) in elevation, mean diurnal range, precipitation of coldest quarter, solar radiation, and exchangeable Ca2+ between the provinces of southwest China. The PCA analysis revealed that elevation, solar radiation, temperature (mean diurnal range, annual temperature range) and precipitation (precipitation seasonality, precipitation of the warmest quarter) were found to be the most significant factors in determining Brachypetalum orchids’ distribution. These findings have implications in assessing conservation effectiveness and determining niche breadth to better protect the populations of these Brachypetalum orchid species in the future.

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Section: Conservation Of Brachypetalum Orchids In Southwest Chinasupporting

confidence: 80%

Geographical Distribution and Relationship with Environmental Factors of Paphiopedilum Subgenus Brachypetalum Hallier (Orchidaceae) Taxa in Southwest China

et al. 2021

Diversity

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“…In situ seed baiting utilises seed enclosed in nylon mesh pouches buried in the soil to measure germination (Rasmussen & Whigham 1993, Brundrett et al 2003. This method has also been adapted for epiphytic orchids (Izuddin et al 2019). Ex situ seed germination was successful with orchids from 6 different genera in WA (Brundrett et al 2003) and tubers sometimes formed within pouches (Batty et al 2001a).…”

Section: Seed Baiting To Locate Compatible Fungi and Suitable Habitatsmentioning

confidence: 99%

A Proposed Framework for Efficient and Cost-Effective Terrestrial Orchid Conservation

Brundrett¹

2020

Preprint

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This paper presents a comprehensive and adaptive framework for orchid conservation programs illustrated with data from published and unpublished case studies. There is a specific focus on West Australian terrestrial orchids, but many of the approaches have universal relevance. Aspects of the framework include (1) setting appropriate objectives, (2) establishing effective collaborations between scientists, volunteers and regulators to fill knowledge and funding gaps, (3) use of survey and demographics data to determine extinction risks and management requirements for species, (4) effective habitat management to overcome threats such as grazing, (5) finding potential new habitats by modelling climate and site data, (6) investigating the effectiveness of pollinators and (7) using seed baiting to detect mycorrhizal fungi. The relative cost and effectiveness of different methods used to propagate orchids for translocation are compared. Methods known to be successful, in order of complexity, include placement of seed in situ, vegetative propagation, symbiotic germination in non-sterile organic matter, symbiotic germination in sterile culture, asymbiotic sterile germination and clonal division in tissue culture. These form a continuum of complexity, cost, time required, faculties needed, as well as the capacity to maintain genetic diversity and produce seedlings preadapted to survive in situ. They all start with seed collection and lead to seed storage, living collections used as tuber banks and seed orchards, as well as translocation for conservation. They could also lead to commercial availability and sustainable ecotourism, both of which are needed to reduce pressure on wild plants. Overall, there has been a strong preference to use relatively complex, expensive and time-consuming methods for orchid conservation, despite evidence that simpler approaches have also been successful. These simpler methods, which include in situ seed placement and non-sterile germination on inorganic substrates, should be trialled in combination with more complex orchid propagation methods as part of an adaptive management framework. It is essential that orchid conservation projects harness the unique biological features of orchids, such as abundant seed production and mycorrhizal fungi which are far more widespread than their hosts. This is necessary to increase the efficiency and coverage of recovery actions for the largest and most threatened plant family.Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 26 April 2020

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“…While some OMF have a very broad distribution, on a local scale they are not ubiquitous so that local orchid populations may associate with different sets of fungi that may involve niche and/or spatial segregation (Fernández et al 2023;McCormick et al 2018;Swift et al 2019), although this is not always the case (Suarez et al 2016). The spatial distribution of the fungi may be dependent on biophysical factors which, in turn, would affect the distribution of their orchid symbionts (Izuddin et al 2019;Jacquemyn et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Climate change will likely facilitate invasion of Asian orchid Eulophia graminea into new areas

Kolanowska,

Rewicz,

Ackerman

2024

Biol Invasions

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Climate change plays an increasing role in the global biodiversity crisis. Alteration in local climatic conditions not only can negatively affect native biodiversity but also can accelerate the introduction and spread of invasive species. In this study the ecological niche modelling approach was used to evaluate possible changes in the distribution of suitable niches of invasive orchid Eulophia graminea within its native (Asia) and non-native geographical range (America, Australia). We mapped the current potential range of this species and analysed three various projections of future climate (for 2100) each with four different climate change scenarios (SSPs). Calculated niche overlap indexes indicated low similarity of niches occupied by native and invasive populations of E. graminea and Australian populations seem to be the most unique, while American and Asian groups share partially similar niches. The occurrence of the American population of E. graminea was correlated especially with the temperature seasonality, while the Asian and Australian populations with annual precipitation and precipitation of the wettest quarter. As indicated in our analyses within Asia and America, E. graminea does not occupy all climatically suitable niches. On the other hand, in Australia the species studied already occupies all appropriate niche space. Climate change will likely be favorable for species studied to expand its range if the biotic components of its niche space (e.g., mycorrhizal fungi) will respond similarly. The most significant range expansion is predicted to occur in Australia which is interesting considering the marginally suitable habitats that E. graminea currently occupies.

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Germination niches and seed persistence of tropical epiphytic orchids in an urban landscape

Cited by 11 publications

References 70 publications

Geographical Distribution and Relationship with Environmental Factors of Paphiopedilum Subgenus Brachypetalum Hallier (Orchidaceae) Taxa in Southwest China

Geographical Distribution and Relationship with Environmental Factors of Paphiopedilum Subgenus Brachypetalum Hallier (Orchidaceae) Taxa in Southwest China

A Proposed Framework for Efficient and Cost-Effective Terrestrial Orchid Conservation

Climate change will likely facilitate invasion of Asian orchid Eulophia graminea into new areas

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