Wave exposure and hydrologic connectivity create diversity in habitat and zooplankton assemblages at nearshore Long Point Bay, Lake Erie

Thomasen, Sarah; Gilbert, Janice M.; Chow‐Fraser, Patricia

doi:10.1016/j.jglr.2012.12.014

Cited by 9 publications

(6 citation statements)

References 38 publications

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“…Both jellyfish species richness and zooplankton density were the lowest during pre‐summer monsoon sampling. High waves may be the underlying factor for the depletion of jellyfish and non‐gelatinous zooplankton assemblages during this sampling period (Thomasen, Gilbert, & Chow‐Fraser, ). The sea during the pre‐summer monsoon was characterized by high waves in the Gulf of Oman (Sanilkumar, Pathak, Pednekar, Raju, & Gowthaman, ).…”

Section: Discussionmentioning

confidence: 99%

The relationship among environmental variables, jellyfish and non‐gelatinous zooplankton: A case study in the north of the Gulf of Oman

et al. 2017

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Processes underlying the temporal and spatial variations observed in the distribution of jellyfish and non‐gelatinous zooplankton in the Gulf of Oman are not well understood. This information gap is clearly a major issue in controlling the harmful blooms of jellyfish and non‐gelatinous zooplankton. Samples of jellyfish and non‐gelatinous zooplankton were collected from six stations in Chabahar Bay and three stations in Pozm Bay within four seasons. At each station, environmental variables were also recorded from bottom and surface water. A total of 83 individuals of medusae representing four species of Scyphozoa (i.e., Cyanea nozakii, Chrysaora sp., Pelagia noctiluca, Catostylus tagi) and species of Hydrozoa (i.e., Diphyes sp., Rhacostoma sp., Aequorea spp.) were observed in the study area. A total of 70,727.25 individuals/m−3 of non‐gelatinous zooplankton dominated by copepods and cladocerans were collected in nine stations within the four seasons. The results of a RELATE analysis yielded no significant association between species composition for jellyfish and non‐gelatinous zooplankton. Among environmental variables, water transparency, nitrite concentration, water depth and temperature were better associated with the total variation in jellyfish species composition than with that of non‐gelatinous zooplankton. Dissolved oxygen, pH, and phosphate concentration were significant environmental variables associated with the variation in the spatial and temporal distribution patterns of non‐gelatinous zooplankton assemblages. Although some jellyfish species (i.e., Rhacostoma sp., Pelagia noctiluca, Catostylus tagi) occur independently of non‐gelatinous zooplankton assemblages, other jellyfish (i.e., Chrysaora sp., Aequorea spp., Cyanea nozakii, Diphyes sp.) are strongly correlated with non‐gelatinous zooplankton assemblages.

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Section: Discussionmentioning

confidence: 99%

The relationship among environmental variables, jellyfish and non‐gelatinous zooplankton: A case study in the north of the Gulf of Oman

et al. 2017

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“…This study was conducted at a site known as “Lake Erie Farms” (42.651469, −80.567886), a 69 ha former agricultural field that produced tobacco and rye grain, and more recently corn and soybean, from 1925 until 2006. Lake Erie Farms is located in southwestern Ontario just north of Long Point, an area that has received numerous natural heritage designations and is a globally recognized biodiversity hotspot (Thomasen et al ). This area is part of Ecoregion 7E, colloquially known as the Carolinian Life Zone.…”

Section: Methodsmentioning

confidence: 99%

Evaluating outcomes of restoration ecology projects on limited budgets: assessment of variation in sampling intensity and sampling frequency for four habitat types

Henry

Murphy

McFarlane

et al. 2018

Restoration Ecology

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While best practices for evaluating restoration ecology projects are emerging rapidly, budget constraints often limit postrestoration monitoring, which emphasizes the need for practical and efficient monitoring strategies. We examined the postrestoration outcome for an ENGO (Nature Conservancy of Canada) project, to assess retroactively how variation in intensity and frequency of sampling would have affected estimates of plant species composition, diversity, and richness over time. The project restored four habitat types (mesic forest, oak woodland, wet meadow, and sand barren) using sculptured seeding of tallgrass prairie and woody species. Species-level plant cover was monitored annually for 10 years in 168 2 × 2-m quadrats. We performed randomization tests to examine estimates of species diversity and richness as a function of the number of quadrats sampled, and assessed the necessity of annual sampling for describing changes in species composition and successional trajectories. The randomization tests revealed that sampling 10-17 quadrats, depending on habitat type, was sufficient to obtain estimates of species diversity that were at least 95% of values obtained from the whole dataset. Species richness as a function of number of quadrats sampled did not plateau, which suggests that rather than increasing the number of sampling quadrats, richness could be estimated more efficiently using nonquadrat based sampling techniques. Nonmetric multidimensional scaling analysis revealed that plant species composition largely stabilized by 3-5 years postrestoration depending on habitat type. By that time, native, seeded species dominated the restoration, and the benefits of annual sampling for tracking changes in species composition diminished.

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“…Lakebed sediment resuspension has been shown to be dominated by wave-generated shear stress during large storm events [Schwab et al, 2006]. Approximately 3% of the coastline in the Apostle Islands National Lakeshore of Lake Superior is designated as wetland [Kraft et al, 2007], which is significantly affected by wave exposure [Thomasen et al, 2013]. Last but not least, lake trout are economically important species that preferentially spawn in a threshold of elevated wave disturbance or turbulence [Fitzsimons and Marsden, 2014].…”

Section: Introductionmentioning

confidence: 99%

Wave climatology in the Apostle Islands, Lake Superior

Anderson

Schwab

2015

J. Geophys. Res. Oceans

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The wave climate of the Apostle Islands in Lake Superior for 35 year was hindcast and examined using a third-generation spectral wave model. Wave measurements within the Apostle Islands and offshore NOAA buoys were used to validate the model. Statistics of the significant wave height, peak wave period, and mean wave direction were computed to reveal the spatial variability of wave properties within the archipelago for average and extreme events. Extreme value analysis was performed to estimate the significant wave height at the 1, 10, and 100 year return periods. Significant wave heights in the interior areas of the islands vary spatially but are approximately half those immediately offshore of the islands. Due to reduced winter ice cover and a clockwise shift in wind direction over the hindcast period, long-term trend analysis indicates an increasing trend of significant wave heights statistics by as much as 2% per year, which is approximately an order of magnitude greater than similar analysis performed in the global ocean for areas unaffected by ice. Two scientific questions related to wave climate are addressed. First, the wave climate change due to the relative role of changing wind fields or ice covers over the past 35 years was revealed. Second, potential bluff erosion affected by the change of wave climate and the trend of lower water levels in the Apostle Islands, Lake Superior was examined.

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Wave exposure and hydrologic connectivity create diversity in habitat and zooplankton assemblages at nearshore Long Point Bay, Lake Erie

Cited by 9 publications

References 38 publications

The relationship among environmental variables, jellyfish and non‐gelatinous zooplankton: A case study in the north of the Gulf of Oman

The relationship among environmental variables, jellyfish and non‐gelatinous zooplankton: A case study in the north of the Gulf of Oman

Evaluating outcomes of restoration ecology projects on limited budgets: assessment of variation in sampling intensity and sampling frequency for four habitat types

Wave climatology in the Apostle Islands, Lake Superior

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