Spatial, Environmental, and Biotic Determinants of Zooplankton Community Composition in Subarctic Lakes and Ponds in Wapusk National Park, Canada

Symons, Celia C.; Pedruski, Michael T.; Arnott, Shelley E.; Sweetman, Jon N.

doi:10.1657/1938-4246-46.1.159

Cited by 18 publications

(10 citation statements)

References 89 publications

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“…The mean Shannon diversity for zooplankton in the thermokarst ponds was 2.97 (range from 1.04 to 6.07), which is higher than that observed in subarctic ponds on the western side of Hudson Bay (mean 0.5, ranging from 0.06 to 1.02) (Symons et al 2014) but similar to the rock-basin reference lakes (mean 2.51, ranging from 1.34 to 3.75). The abundant rotifer communities in the thermokarst ponds were dominated by few species.…”

Section: Taxonmentioning

confidence: 53%

Permafrost thaw lakes and ponds as habitats for abundant rotifer populations

Bégin

Vincent

2017

Arctic Science

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Thermokarst lakes and ponds were sampled across a range of permafrost landscapes in subarctic Québec (Nunavik, Canada) to compare their rotifer and other zooplankton characteristics with a set of rock-basin lakes and ponds in the region. A total of 24 rotifer species were identified, with an average of seven taxa per waterbody. Rotifer abundance was an order of magnitude higher in the thaw ponds than in rock-basin waters. In some thaw ponds, rotifers accounted for >50% of the total zooplankton biomass, but for <10% in all of the rock-basin waters. Neither α-nor β-diversity was significantly different between the two waterbody types. Grazing experiments with microspheres (0.5-6 μm diameter) showed that medium-sized particles (2-3 μm) were preferred to smaller and larger particles; clearance rates were <0.05% of the water column per day, implying that the rotifer populations were unlikely to be bottom-up limited by food availability. Rotifer abundance was negatively correlated with cladoceran densities, suggesting possible interference effects. Chaoborus larvae were also present and may exert a top-down control. Thermokarst ponds are currently favorable environments for rotifers, but the rapid change they have begun to experience brings uncertainty about their ongoing capacity to sustain these prolific communities.Key words: diversity, permafrost, rotifers, thermokarst, zooplankton.Résumé : Des lacs et des mares thermokarstiques ont fait l'objet de prélèvement d'échan-tillons dans divers paysages de pergélisol à travers le Québec subarctique (Nunavik, Canada), afin de comparer les caractéristiques de leurs rotifères et autres zooplanctons, et ce, à un ensemble de lacs et de mares d'ombilic glaciaire dans la région. On a identifié un total de 24 espèces de rotifères, avec une moyenne de sept taxons par plan d'eau. L'abondance de rotifères était d'un ordre de grandeur plus élevé dans les mares de fonte que dans les eaux d'ombilic glaciaire. Dans quelques mares de fonte, les rotifères représentaient >50% de l'ensemble de la biomasse du zooplancton, mais elles en représentaient <10% dans toutes les eaux d'ombilic glaciaire. Ni la diversité α ni β ne se distinguait sensiblement entre les deux types de plan d'eau. Des expériences de broutage avec des microsphères (0,5 à 6 μm de diamètre) ont montré que les particules de taille moyenne (2-3 μm) étaient préférées comparativement aux plus petites et aux grandes particules; les taux d'élimination étaient <0,05% de la colonne d'eau par jour, ce qui laisse entendre qu'il était peu probable que les populations de rotifères subissent une limitation ascendante en raison de la disponibilité alimentaire. L'abondance de rotifères était négativement corrélée avec les densités de cladocères, suggérant des effets d'interférence possibles. Des larves Chaoborus étaient aussi pré-sentes et pouvaient exercer un contrôle descendant. Les mares thermokarstiques sont For personal use only.actuellement des environnements propices aux rotifères, mais le changement rapide que ces env...

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Section: Taxonmentioning

confidence: 53%

Permafrost thaw lakes and ponds as habitats for abundant rotifer populations

Bégin

Vincent

2017

Arctic Science

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“…Previous research by Bos and Pellatt (2012) examined the water chemistry of several ponds within and adjacent to WNP and reported gradients in ion concentration related to the proximity of Hudson Bay, and dissolved organic carbon (DOC) concentration related to variation in vegetation density. Other studies have documented the diversity in zooplankton communities and underscored the importance of nutrients in limiting phytoplankton growth (Symons et al 2012(Symons et al , 2014. Here, we add to the existing knowledge of the freshwater biotic communities of WNP by characterizing the distribution and diversity of their modern diatom (Bacillariophyceae) assemblages.…”

Section: Introductionmentioning

confidence: 96%

“…Other studies have documented the diversity in zooplankton communities and underscored the importance of nutrients in limiting phytoplankton growth (Symons et al. , ). Here, we add to the existing knowledge of the freshwater biotic communities of WNP by characterizing the distribution and diversity of their modern diatom (Bacillariophyceae) assemblages.…”

Section: Introductionmentioning

confidence: 99%

Distribution and diversity of diatom assemblages in surficial sediments of shallow lakes in Wapusk National Park (Manitoba, Canada) region of the Hudson Bay Lowlands

Jacques

Bouchard

MacDonald

et al. 2016

Ecology and Evolution

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The hydrology of shallow lakes (and ponds) located in the western Hudson Bay Lowlands (HBL) is sensitive to climate warming and associated permafrost thaw. However, their biological characteristics are poorly known, which hampers effective aquatic ecosystem monitoring. Located in northern Manitoba along the southwestern coast of Hudson Bay, Wapusk National Park (WNP) encompasses numerous shallow lakes representative of the subarctic zone. We analyzed the distribution and diversity of diatom (microscopic algae; class Bacillariophyceae) assemblages in surficial sediments of 33 lakes located in three different ecozones spanning a vegetation gradient, from NE to SW: the Coastal Fen (CF), the Interior Peat Plateau (IPP), and the Boreal Spruce Forest (BSF). We found significant differences (P < 0.05) in diatom community composition between CF and IPP lakes, and CF and BSF lakes, but not between IPP and BSF lakes. These results are consistent with water chemistry measurements, which indicated distinct limnological conditions for CF lakes. Diatom communities in CF lakes were generally dominated by alkaliphilous taxa typical of waters with medium to high conductivity, such as Nitzschia denticula. In contrast, several IPP and BSF lakes were dominated by acidophilous and circumneutral diatom taxa with preference for low conductivity (e.g., Tabellaria flocculosa, Eunotia mucophila, E. necompacta var. vixcompacta). This exploratory survey provides a first detailed inventory of the diatom assemblages in the WNP region needed for monitoring programs to detect changes in shallow lake ecosystems and ecozonal shifts in response to climate variations.

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“…Isso faz com que esses ecossistemas tenham características de região litorânea, com menor profundidade e maior influência do entorno, o que lhes conferem características ecológicas únicas (SOUSA; ELMOOR-LOUREIRO, 2008). No Brasil há uma grande ocorrência de pequenos ambientes lênticos, e apesar de sua importância ecológica, a maior parte dos estudos de diversidade de espécies, principalmente sobre a comunidade zooplanctônica, são voltados para os ecossistemas aquáticos de grande porte, como os reservatórios, rios e grandes lagos (NEVES et al, 2013;MASSICOTTE et al, 2014;SYMONS et al, 2014). Como a biota desses ecossistemas está submetida a uma série de impactos decorrentes das atividades antrópicas, uma das maneiras de se avaliar e detectar as mudanças nesses ambientes é o estudo das suas comunidades biológicas.…”

Section: Introductionunclassified

Comunidade zooplanctônica de dois corpos d'água em uma área prioritária de conservação no município de Guaxupé - MG

Silva¹,

Santos-Wisniewski²

2016

ANAP

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Spatial, Environmental, and Biotic Determinants of Zooplankton Community Composition in Subarctic Lakes and Ponds in Wapusk National Park, Canada

Cited by 18 publications

References 89 publications

Permafrost thaw lakes and ponds as habitats for abundant rotifer populations

Permafrost thaw lakes and ponds as habitats for abundant rotifer populations

Distribution and diversity of diatom assemblages in surficial sediments of shallow lakes in Wapusk National Park (Manitoba, Canada) region of the Hudson Bay Lowlands

Comunidade zooplanctônica de dois corpos d'água em uma área prioritária de conservação no município de Guaxupé - MG

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