A note on phenology and seed-germination behavior in two natural populations of the endangered aquatic macrophytes, Sparganium erectum var. erectum and S. erectum var. macrocarpum (Sparganiaceae).

天平, 石居; 祐一郎, 中山; 裕文, 山口

doi:10.3719/weed.50.82

Cited by 6 publications

(5 citation statements)

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“…The distribution of S. erectum ssp. stoloniferum , which also prefers wet and disturbed habitats (Ishii et al , ), was significantly positively affected by the number of confluences and total river length in the 10‐km grid but not in the 5‐km grid. One possible explanation for this difference between the two grids is that S. erectum ssp.…”

Section: Discussionmentioning

confidence: 99%

“…These three species were selected because the number of occurrences was higher than other species studied in the rivers of Hyogo Prefecture; they each exhibited ecological traits related to flooding (i.e. require some sort of water regime) and are well known endangered riparian species in Japan (Yonemura et al , ; Ishii et al , ; Takakuwa et al , ). During data collection, overlapping species records from two data sources were excluded.…”

Section: Methodsmentioning

confidence: 99%

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The role of river confluences and meanderings in preserving local hot spots for threatened plant species in riparian ecosystems

Osawa

Mitsuhashi

Niwa

et al. 2011

Aquatic Conserv: Mar. Freshw. Ecosyst.

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ABSTRACT1. While flooding creates diverse habitats for plants and animals in riparian ecosystems, it presents a nuisance to human settlement. Thus, such areas that are frequently disturbed by flooding are more likely to experience strong artificial control measures.2. This hypothesis was tested and a method was developed to identify these areas using river maps. The effects of two terrain components that could potentially influence flooding frequency (the number of confluences and the degree of meandering per unit area) on both the distribution of threatened species and the degree of artificial modification were examined at two different scales (grid sizes) using two riparian data sources.3. The numbers of threatened plant species and artificial constructions increased with the number of confluences and the degree of meandering per unit area. The number of threatened plant species was not correlated with the number of artificial constructions.4. In addition, the results suggest that confluences and meanderings provide different habitat conditions for threatened plant species. Confluences may provide more frequently disturbed habitats, whereas meanderings may provide relatively stable habitats.5. Based on these results, through flooding, both confluences and meanderings are important for creating and maintaining the diverse habitats used by threatened species, but these habitats are also currently threatened by artificial controls. We suggest that a per-unit-area confluence density and river length map is a helpful tool for locating local biodiversity hot spots. The identification of major reservoirs of biodiversity that are currently threatened can improve conservation and management planning.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The role of river confluences and meanderings in preserving local hot spots for threatened plant species in riparian ecosystems

Osawa

Mitsuhashi

Niwa

et al. 2011

Aquatic Conserv: Mar. Freshw. Ecosyst.

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“…erectum grows in lotic and lentic environments. Many species of this genus grow as a submerged form in running water [7]. However, the emergent of S. erectum occur commonly at the margins of low-and mediumenergy river systems across the northern temperature zone [8].…”

Section: The Growth Situation Of Sparganium In Each Sampling Locationmentioning

confidence: 99%

“…We consider that Sparganium is suitable for growth with the above-mentioned ditch. However, recent years, the habitat of Sparganium (i.e., S. erectum, S. emersum and S. emetsum) shows the tendency to decrease according to the influence of the development of the river maintenance [6,7]. In addition, basic information on the life history and habitat characteristics of Sparganium is lacking.…”

Section: Introductionmentioning

confidence: 99%

Effects of environmental factors on Sparganium emersum and Sparganium erectum colonization in two drainage ditches with different maintenance

Kaneko¹,

Jinguji²

2012

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In the Niheishimizu and Ooshimizu sections of the town of Misato in the Akita Prefecture, Northern Japan, there are many abundant spring water areas. Sparganium (Sparganium emersum and Sparganium erectum) species are widely distributed in the irrigation water that fed by spring water. The irrigation waters were divided the natural type ditch and the maintained ditch that connect with nearby natural ditch to promote environmentally friendly agriculture. This study was conducted in both sections to support the maintenance of the irrigation water fed by the abundant spring water. A vegetation survey was conducted in September of 2005. The survey collected data on the amount of vegetation cover and the stem lengths of the plant species found in selected locations of the study area. The water depths and the flow velocities were also measured in these locations. As for the growth situation of S. emersum and S. erectum, the submerged form of S. emersum was found in water approximately 15 cm deep with a surface flow velocity of approximately 7 cm/s. This species was characterised by a relatively fast flow and relatively shallow water. The emergent and submerged growth forms of S. emersum were found in waters having flow velocities faster than those associated with S. erectum. The emergent form of S. emersum grew in relatively deep water. S. emersum is more capable of adjusting to the conditions of stream habitats than S. erectum

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“…An overview of germination at initial stages of the development of seedlings (mainly S. emersum Rehm. and S. erectum L.) is given in studies by a number of foreign scientists (Muenscher, 1936;Steinbauer & Neal, 1950;Ishii et al, 2005;Kim et al, 2017). Studies by Dutch scientists (Pollux, 2011;Pollux et al, 2006;2007) were focused on study of germination of seeds of S. emersum as a result of their travelling through the gastrointestinal tract of various agents (birds, fish).…”

Section: Introductionmentioning

confidence: 99%

Ontogenesis of the genets and ramets of some European species of the genus Sparganium subgenus Xanthosparganium

Belyakov

Lapirov

2019

Regul. Mech. Biosyst.

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Representatives of the Sparganium L. genus belong to an ecological group of short grass helophytes which live in the shoreline area of different water bodies. Despite the fact that most representatives of the genus exhibit notable polymorphism (depending on the level regime of a water body, they can form various ecological forms), characteristic of all of them is presence of only one living form – vegetative mobile clear polycentric long-rhizomatous pseudoannual polycarpic plant with racemose root system. The objective of the article was to study the ontogenesis of genets and ramets on the example of representatives of the Xanthosparganium subgenus (S. emersum Rehm., S. glomeratum (Laest. ex Beurl.) Neum., S. gramineum Georgi and S. natans L.). The research was conducted using the ontogenetic approach. In the study, we analyzed ontogenesis of genet (from generative diaspore) and ontogenesis of ramets (from vegetative diaspores – tuber-like structures and axillary buds of vegetative-generative monocarpic and vegetative rosette shoots). We demonstrated that ontogenesis of genets and ramets (on the basis of tuber-like structures) in laboratory conditions is abrupt. It was found that the model species of Sparganium are characteristic in combining of incomplete and special ontogenesis, which is related to the omission of phases of the post-generative period. Such peculiarity is conditioned by increase in tempi of ontogenetic development. On the basis of specific ontogenesis, a variant of shortened ontogenesis is possible, during which the virginile ontogenetic condition is omitted. This feature could be characterized as dynamic polyvariance of ontogenesis, whereas bud initiation and development of shoots throughout the vegetative season, characterized as heterochrony, has been formed over the process of natural selection. Heterochrony (on the basis of iterative branching without periods of rest) includes a property of formation of vegetative-generative shoots which develop on the basis of sylleptic shoots of subsequent orders of branching. The main course of ontogenesis in natural conditions corresponds to D-type which occurs in order of generations of individuals of vegetative origin.

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A note on phenology and seed-germination behavior in two natural populations of the endangered aquatic macrophytes, Sparganium erectum var. erectum and S. erectum var. macrocarpum (Sparganiaceae).

Cited by 6 publications

References 5 publications

The role of river confluences and meanderings in preserving local hot spots for threatened plant species in riparian ecosystems

The role of river confluences and meanderings in preserving local hot spots for threatened plant species in riparian ecosystems

Effects of environmental factors on <i>Sparganium emersum</i> and <i>Sparganium erectum</i> colonization in two drainage ditches with different maintenance

Ontogenesis of the genets and ramets of some European species of the genus Sparganium subgenus Xanthosparganium

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A note on phenology and seed-germination behavior in two natural populations of the endangered aquatic macrophytes, Sparganium erectum var. erectum and S. erectum var. macrocarpum (Sparganiaceae).

Cited by 6 publications

References 5 publications

The role of river confluences and meanderings in preserving local hot spots for threatened plant species in riparian ecosystems

The role of river confluences and meanderings in preserving local hot spots for threatened plant species in riparian ecosystems

Effects of environmental factors on &lt;i&gt;Sparganium emersum&lt;/i&gt; and &lt;i&gt;Sparganium erectum&lt;/i&gt; colonization in two drainage ditches with different maintenance

Ontogenesis of the genets and ramets of some European species of the genus Sparganium subgenus Xanthosparganium

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Effects of environmental factors on <i>Sparganium emersum</i> and <i>Sparganium erectum</i> colonization in two drainage ditches with different maintenance