The interactive effects of water flow and reproductive strategies on seed and seedling dispersal along the substrate in two sub-tropical seagrass species

Darnell, Kelly M.; Booth, Dale M.; Koch, Evamaría W.; Dunton, Kenneth H.

doi:10.1016/j.jembe.2015.05.006

Cited by 20 publications

(17 citation statements)

References 46 publications

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“…It is for these reasons we suspect the newly established patch found at the KB shallow planting area in November 2013 was most likely derived from a seedbank. Seedbank formation occurs when seeds are deposited at or below the sediment with minimal dispersal distance from the parent plant (Darnell, Booth, Koch, & Dunton, ). Seedbanks are a vital recovery feature for H. wrightii , as limited carbohydrate storage potential makes this species vulnerable to severe or extended stress events (Biber, Kenworthy, & Paerl, ).…”

Section: Discussionmentioning

confidence: 99%

The influence of seagrass donor source on small‐scale transplant resilience

McDonald

Christiaen

Major

et al. 2020

Aquatic Conservation

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1. Concern for conservation of seagrass habitat has prompted international transplantation-style restoration efforts. A recent review of these restoration efforts has highlighted the low success associated with small-scale restorations, yet scaling up transplantation effort may be too costly for underfunded regions. Small-scale transplant survival can be enhanced with alleviation of two underlying issues: restoration site selection and donor site selection. 2. To investigate appropriate donor source selection, donor site environmental influence on seagrass (Halodule wrightii) transplant survival was examined by transplanting donor cores from two environmentally disparate sites to a transplantation site with limited environmental uncertainties. Donor sites were chosen to represent either end of a benthic light gradient (high versus low) to elucidate seagrass resilience to transplantation stress, with respect to donor site conditions. 3. After total loss of the first trial, a second trial was conducted with stabilizing mesh placed over transplants to reduce stingray bioturbation. The second trial resulted in 100% survival of high light transplants after 12 months and moderate survival (30-60%) of low light transplants for the first six months. 4. At 18 months, the second trial ended after sediment burial from a hurricane. One year post-burial, a patch of H. wrightii recovered at the high light transplant site; after six years the patch expanded to approximately 74 m 2 , an area 37-fold larger than originally planted. 5. Results from this transplant experiment provide evidence that donor environment plays a role in transplant resilience. The transplants sourced from high light had 47% greater leaf area per shoot, were more resistant to transplantation stress, and recovered following an extreme event relative to low light transplants. Therefore, selection of donor plants with more resilience features, a transplantation site with limited environmental uncertainties, and adaptive intervention can enhance seagrass resilience at a small planting scale.

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Section: Discussionmentioning

confidence: 99%

The influence of seagrass donor source on small‐scale transplant resilience

McDonald

Christiaen

Major

et al. 2020

Aquatic Conservation

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“…The dispersal routes of plant seeds include direct dispersal as a result of gravity, wind, and mechanical effects, and also secondary dispersal caused by animal foraging or water after direct dispersal (Thompson, Assouline, Chen, Trahktenbrot, & Svoray, ; Darnell, Booth, Kochv, & Dunton, ). In riparian ecosystems, once plant seeds have been dispersed by the wind to the surface of the soil or into the current, secondary dispersal often occurs due to water level fluctuations (Middleton, ; Nilsson, Brown, Jansson, & Merritt, ).…”

Section: Introductionmentioning

confidence: 99%

“…In riparian ecosystems, once plant seeds have been dispersed by the wind to the surface of the soil or into the current, secondary dispersal often occurs due to water level fluctuations (Middleton, ; Nilsson, Brown, Jansson, & Merritt, ). Therefore, secondary seed dispersal is one of the main sources for riparian soil seed banks (Huiskes, Koutstaal, Herman, Beeftink, & Markusse, ) and has important effects on species composition and diversity and on their spatial distribution in the riparian soil seed banks (Darnell et al, ; Nilsson et al, ), thereby influencing seedling regeneration and the spatial distribution patterns of riparian plant communities (Dixon, ). Water currents can disperse seeds at both the surfaces and base of riverbanks (Parolin, ).…”

Section: Introductionmentioning

confidence: 99%

Secondary seed dispersal in hydro‐fluctuation belts and its influence on the soil seed bank

Chen

Zhang

et al. 2019

River Research & Apps

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The completion of the Three Gorges project altered the water level fluctuations from "summer submersion and winter exposure" to "summer exposure and winter submersion." The reverse seasonal flooding has dramatically changed both the time and duration of exposure and submergence of reservoir banks. Secondary seed dispersal by water is the primary method of dispersal in hydro-fluctuation belts. This study conducted field sampling and germination experiments to evaluate the effects of reverse seasonal flooding on species composition, diversity, and density of the secondary seed dispersal system and the soil seed bank, and their changes with elevation, in the Xiangzi River. The results indicate that that the secondary seed dispersal system and soil seed bank were associated with 42 and 50 plant species, respectively, and their average seed densities were 1,876.27 and 7,322.18 seeds/m 2 , respectively.The quantity of seeds from secondary seed dispersal accounted for 20.40% of the soil seed bank. The species life-form composition of both consisted mainly of annual and perennial grasses. Among these grasses, the dominant species in the secondary seed dispersal system were Cynodon dactylon and Paspalum distichum, whereas the dominant species in the soil seed bank were Solanum nigrum and Rumex dentatus. Due to the effects of reverse seasonal water level fluctuations, the species composition and quantity of the soil seed bank and secondary seed dispersal system largely exhibited similar spatial distribution characteristics, but some differences were observed. The species quantity, species diversity index, and seed density in the soil seed bank were the highest in the middle section of the hydro-fluctuation belt, followed by the top section and then the bottom section. Conversely, the species quantity, species diversity index, and seed density in the secondary seed dispersal system were highest at the top section, followed by the middle section and then the bottom section.

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“…As such they have gained widespread use in marine research documenting trawl net interactions with wildlife (Ferrari et al, 2015), monitoring fish assemblages (Letessier et al, 2013) and even documenting seagrass dispersal (Darnell et al, 2015). Features such as durability, high waterproof rating, high-definition (HD) resolution, ease of use and long battery life have led to the uptake of the technology across many disciplines such as videography and action sports and there is growing use in biological applications.…”

Section: Introductionmentioning

confidence: 99%

“…When compared with video units available only a decade ago, action cameras are far more powerful and substantially cheaper than equivalent older model waterproof cameras. As such they have gained widespread use in marine research documenting trawl net interactions with wildlife (Ferrari et al, 2015), monitoring fish assemblages (Letessier et al, 2013) and even documenting seagrass dispersal (Darnell et al, 2015). Terrestrial uses for the technology are growing, with documentation of prey cue preferences in the dusky pygmy rattlesnake (Sistrurus miliarius barbouri) (Holding et al, 2016), of the feeding behaviour of large mammals (Owen et al, 2015) and some use in pollination biology (Steen & Thorsdatter Orvedal Aase, 2011;Lortie et al, 2012;Edwards et al, 2015;Nakase & Suetsugu, 2015).…”

Section: Introductionmentioning

confidence: 99%

The use of digital video recorders in pollination biology

Gilpin

Denham

Ayre

2017

Ecological Entomology

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1. Digital video recording (DVR) devices, such as the GoPro Hero, have the potential to greatly benefit pollination ecology, but the advantages of digitally recording pollinator activity over direct human observation have not been formally assessed.2. Two plant taxa, Lavandula angustifolia and Canna 'sp.', with differing floral morphology, were used to compare the value of DVR and direct observations in estimating honeybee (Apis mellifera) visitation, flower density and number of flowers visited per foraging bout.3. The two methods yielded identical results when observing the structurally simple L. angustifolia at both high (10.54 ± 0.52 per plant) and low honeybee density (2.24 ± 0.20 per plant). However, DVR underestimated the number of flowers scored in the field of view (28.7 ± 1.8 direct vs. 22.7 ± 0.9 DVR), the number of honeybees observed (5.3 ± 0.8 direct vs. 3.7 ± 0.7 DVR) and the number of flowers visited during foraging bouts (8.3 ± 1.2 direct vs. 5.5 ± 1.0 DVR) on the more complex Canna 'sp.' 4. It is concluded that portable weatherproof DVR devices such as the GoPro Hero are valuable tools for pollination biologists, allowing a single researcher to make simultaneous observations of multiple plants in one or more sites, whilst also allowing the footage to be reviewed. However, DVR devices are limited by their depth and field of view when target plants are large or structurally complex.

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The interactive effects of water flow and reproductive strategies on seed and seedling dispersal along the substrate in two sub-tropical seagrass species

Cited by 20 publications

References 46 publications

The influence of seagrass donor source on small‐scale transplant resilience

The influence of seagrass donor source on small‐scale transplant resilience

Secondary seed dispersal in hydro‐fluctuation belts and its influence on the soil seed bank

The use of digital video recorders in pollination biology

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