Abstract
Ottelia alismoides is now at risk of extinction and listed as a threatened aquatic plant species in China. We investigated the responses of O. alismoides to four amplitudes (static, ± 25, ± 50 and ± 75 cm) of water level fluctuations. In all treatments, the water level fluctuated around an initial water depth of 100 cm. Within each amplitude treatment, two fluctuating frequencies were chosen: two cycles (low frequency) and six cycles (high frequency) during the 72 days of the experiment. Leaf characters (number and area) were not affected by the amplitudes. Below-ground dry weight (DW) allocation was proportionally similar in all treatments. Though there were no significant differences between the static and fluctuating water levels in the total DW, total DW had a decreasing trend in the ± 75 cm amplitude. Interestingly, the largest total DW for O. alismoides occurred in the ± 25 cm amplitude suggesting the species prefers moderately fluctuating water levels. Fruit DW allocation and fruit number were similar in all water regimes, but seed number per fruit decreased in the ± 75 cm amplitude. O. alismoides generally did not respond to the fluctuating frequencies. We conclude that O. alismoides can tolerate moderate water level fluctuations, but high fluctuating amplitude (± 75 cm) reduced the plant performance. Decisions related to conservation of this species should take the disturbance caused by water level fluctuations into consideration.
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Claims 11
Claim · model-written summary
Leaf number and leaf area of O. alismoides were not affected by the water level fluctuation amplitudes.
- Taxon
- Ottelia alismoides
Ottelia alismoidest0 - Treatment
- amplitudese0
- Outcome
- Leaf characters (number and area)e0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“Leaf characters (number and area) were not affected by the amplitudes”
Claim · model-written summary
Below-ground dry weight allocation was proportionally similar in all water level treatments.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- water level fluctuationst1
- Outcome
- Below-ground dry weight (DW) allocatione0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“Below-ground dry weight (DW) allocation was proportionally similar in all treatments”
Claim · model-written summary
Total dry weight did not differ significantly between static and fluctuating water levels.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- fluctuating water levelse0
- Outcome
- total DWe0
- Direction
- no significant differencese0
- Comparator
- statice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“there were no significant differences between the static and fluctuating water levels in the total DW”
Claim · model-written summary
Total dry weight tended to decrease at the +/-75 cm amplitude.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- ± 75 cm amplitudee0
- Outcome
- total DWe0
- Direction
- decreasing trende0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“total DW had a decreasing trend in the ± 75 cm amplitude”
Claim · model-written summary
The largest total dry weight occurred at the +/-25 cm amplitude, suggesting a preference for moderately fluctuating water levels.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- ± 25 cm amplitudee0
- Outcome
- the largest total DWe0
- Direction
- largeste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“the largest total DW for O. alismoides occurred in the ± 25 cm amplitude”
Claim · model-written summary
Fruit dry weight allocation and fruit number were similar in all water regimes.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- water regimese0
- Outcome
- Fruit DW allocation and fruit numbere0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“Fruit DW allocation and fruit number were similar in all water regimes”
Claim · model-written summary
Seed number per fruit decreased at the +/-75 cm amplitude.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- ± 75 cm amplitudee0
- Outcome
- seed number per fruite0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“seed number per fruit decreased in the ± 75 cm amplitude”
Claim · model-written summary
O. alismoides generally did not respond to the two fluctuation frequencies.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- fluctuating frequenciese0
- Outcome
- responde0
- Direction
- did not responde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“O. alismoides generally did not respond to the fluctuating frequencies”
Claim · model-written summary
High fluctuation amplitude (+/-75 cm) reduced plant performance.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- high fluctuating amplitude (± 75 cm)e0
- Outcome
- plant performancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“high fluctuating amplitude (± 75 cm) reduced the plant performance”
Claim · model-written summary
O. alismoides can tolerate moderate water level fluctuations.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Treatment
- moderate water level fluctuationse0
- Outcome
- toleratee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
t1“water level fluctuations”
e0“O. alismoides can tolerate moderate water level fluctuations”
Claim · model-written summary
Conservation decisions for this threatened species should consider the disturbance caused by water level fluctuations.
- Taxon
- Ottelia alismoidesOttelia alismoidest0
- Outcome
- conservation of this speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ottelia alismoides”
e0“Decisions related to conservation of this species should take the disturbance caused by water level fluctuations into consideration”