California vernal pool endemic responses to hydroperiod, plant thatch, and nutrients

Kneitel, Jamie M.; Samiylenko, Nestor; Rosas-Saenz, Luis; Nerida, Alyssa

doi:10.1007/s10750-017-3174-7

Cited by 10 publications

(12 citation statements)

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“…Environmental responses were measured from a 20-week mesocosm experiment (Kneitel et al 2017). It consisted of 12 treatments with hydroperiod (stable and unstable), nutrient addition (control and addition), and thatch (control, native plant thatch, and exotic plant thatch) in a full-factorial design.…”

Section: Methodsmentioning

confidence: 99%

“…Using taxonomically diverse invertebrate data from two separate studies (Kneitel , Kneitel et al. ), the goal was to test niche‐based predictions using species occupancy and environmental responses. Generalist species were expected to have higher occupancy (Swihart et al.…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this study was to assess specialist (vernal pool endemics) and generalist (widespread wetland) taxa found in California vernal pools along a latitudinal gradient and their responses to environmental variation. Using taxonomically diverse invertebrate data from two separate studies (Kneitel 2016, Kneitel et al 2017, the goal was to test niche-based predictions using species occupancy and environmental responses. Generalist species were expected to have higher occupancy (Swihart et al 2006, Verberk et al 2010 and less variance in their response to environmental conditions, whereas specialists (endemics) should have lower occupancy and greater variance to environmental conditions (Clavel et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Occupancy and environmental responses of habitat specialists and generalists depend on dispersal traits

Kneitel

2018

Ecosphere

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Abstract. Ecologists have been interested in understanding communities through the lens of specialists and generalists to predict species diversity and distribution patterns and to ameliorate worldwide declines in specialist species. Dispersal traits are assumed to be associated with specialization (specialists are weaker dispersers than generalists), but dispersal modes can be variable within groups. Niche-based predictions of occupancy and environmental responses were assessed using invertebrates from California vernal pools that were categorized by specialization (endemic or widespread taxa) and dispersal mode (passive or active dispersal). Data from a latitudinal gradient resulted in widespread taxa with greater percent occupancy than endemic taxa as predicted, but passive dispersers had greater occupancy than active dispersers in contrast to predictions. Endemic species and widespread-active dispersers exhibited similar levels of specialization measured as coefficient of variation among treatments in a mesocosm experiment. This suggested that habitat choice was important, and these differences in specialization were scale dependent (generalists across habitat types and specialists within a habitat type). A negative correlation between latitudinal occupancy and level of specialization demonstrated how local-scale responses and landscape patterns were related and depend on both specialization and dispersal traits. This study underscores how habitat heterogeneity and species traits, including specialization and dispersal, can interact to affect community patterns at different spatial scales.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Occupancy and environmental responses of habitat specialists and generalists depend on dispersal traits

Kneitel

2018

Ecosphere

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“…An additional reason for such rather low species diversity pointed out by the authors could be the lack of both surveys and specialists in several parts of this quite large area. Kneitel et al (2017) discuss that many large branchiopods exhibit high endemism levels and many are threatened or endangered; therefore there is an urgent need to better understand how ecological factors related to habitat periodicity influence life strategies. These authors examined the effects of hydroperiod stability, plant thatch and nutrient runoff on the emergence and density of four vernal pool endemic species (two anostracans, one notostracan and one spinicaudatan) in California (USA).…”

Section: Ecology Biogeography and Conservationmentioning

confidence: 99%

New challenges in anostracan research: old issues, new perspectives and hot topics

et al. 2017

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We present a summary of responses to our call among scientists working on Anostraca to commemorate the late Professor Graziella Mura, a pioneer of modern studies on this group of animals. Colleagues from all over the world promptly answered and contributed their works among which we selected the fourteen papers published in the Hydrobiologia Special Volume ''New Challenges in anostracan research: a tribute to Graziella Mura''. Although Anostraca are widespread globally, they are among the least known taxonomic groups. Although some biogeographical data are available for some species and higher taxa, we are still far from a clear understanding of the phylogeny, ecology and biogeography of the order. The papers collected in this Special Volume are therefore intended to represent a step ahead to solve phylogenetic and ecological issues relative to this charming group of crustaceans.

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“…The fairy shrimp Branchinecta orientalis (G. O. Sars 1901) is a non‐selective filter feeder of plankton and suspended material like other fairy shrimps (Beladjal, Peiren, Dierckens, & Mertens, ), which inhabits vernal pools. These pools periodically dry, particularly during summer, and are very important habitats for large branchiopods (Atashbar, Agh, Van Stappen, Mertens, & Beladjal, ), many of which are endangered (Kneitel, Samiylenko, Rosas‐Saenz, & Nerida, ).…”

Section: Introductionmentioning

confidence: 99%

Reproductive performance of fairy shrimpBranchinecta orientalis(G. O. Sars 1901) (Crustacea: Anostraca), fed with effluent of rainbow troutOncorhynchus mykiss(Walbaum 1792) ponds

et al. 2018

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Aquaculture production is predicted to increase sharply. In this regard, live feed plays a crucial role in the larval phase of many aquaculture organisms. Hence, a persistent concern in aquaculture is to find low‐cost and eco‐friendly feed sources to culture live feed organisms. Branchinecta orientalis (G. O. Sars 1901), a fresh/brackish water fairy shrimp, was reared using effluent from rainbow trout Oncorhynchus mykiss (Walbaum 1792) ponds, either fresh but supplemented with two species of microalgae, Scenedesmus sp. and Haematococcus sp., or non‐supplemented but after “ageing” of the culture medium. The feeding experiment was designed at a density of 100 individuals L−1 in 2‐L vessels. The results indicated that differences between final length, survival and most reproductive parameters of the treatment with aged medium and the treatment using fresh medium supplemented with Scenedesmus sp. were non‐significant (p > .05). Better results were obtained for a number of reproductive parameters in the treatment supplemented with Haematococcus sp. Thus, for intensive resting egg production of B. orientalis, microalgae can be replaced by aged non‐supplemented effluent from trout ponds as a nutrient‐rich feed source. This consequently can reduce drainage of nutrients into the environment and thus decrease aquatic pollution.

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California vernal pool endemic responses to hydroperiod, plant thatch, and nutrients

Cited by 10 publications

References 91 publications

Occupancy and environmental responses of habitat specialists and generalists depend on dispersal traits

Occupancy and environmental responses of habitat specialists and generalists depend on dispersal traits

New challenges in anostracan research: old issues, new perspectives and hot topics

Reproductive performance of fairy shrimpBranchinecta orientalis(G. O. Sars 1901) (Crustacea: Anostraca), fed with effluent of rainbow troutOncorhynchus mykiss(Walbaum 1792) ponds

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