Untitled

Stansfield, Julia; Perrow, Martin R.; Tench, Louise D.; Jowitt, Adrian J. D.; Taylor, Ayesha A. L.

doi:10.1023/a:1017091407556

Cited by 129 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the establishment of submerged macrophytes or an increase in turbidity, visual cues become less reliable as guides for prey consumption (Brönmark and Hansson 2012). Submerged macrophytes provide structural complexity that increases refuge availability for prey (Savino and Stein 1982;Stansfield et al 1997) and limits the swimming movement of certain predators (Diehl 1988). Turbidity decreases the contrast between the background and the prey (Utne-Palm 1999), providing a visual refuge (Jacobsen et al 2004;Ranåker et al 2012) by making prey less noticeable and decreasing the predator's reaction distance (Confer et al 1978).…”

Section: Introductionmentioning

confidence: 99%

Structural complexity and turbidity do not interact to influence predation rate and prey selectivity by a small visually feeding fish

Figueiredo

Mormul

Benedito

2015

Mar. Freshwater Res.

View full text Add to dashboard Cite

Structural complexity and turbidity decrease predation by respectively providing a physical and visual refuge for prey. It is still unclear how the covariance between these variables could drive predation and prey selectivity. We experimentally simulated scenarios that are temporally observed in floodplain rivers. In the experiments, we crossed different prey types, structural complexity and turbidity. We hypothesised that the negative relationship between structural complexity and predation would become stronger with a linear increase in the turbidity level and that an increase in structural complexity and in turbidity would change prey selectivity from a selective to a random pattern. Our results showed that the effects of structural complexity and turbidity on predation may not covary; a linear increase in turbidity did not significantly change the patterns of predation or prey selectivity. In contrast, structural complexity significantly reduced prey consumption according to prey size. We argue that areas with low macrophyte cover may provide an efficient refuge for smaller prey, whereas an efficient refuge for larger prey can be attained only in areas with high macrophyte cover. In highly complex habitats, specificity in prey consumption is precluded because both prey species can hide amid the interstices of the macrophytes, leading to random prey selectivity.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural complexity and turbidity do not interact to influence predation rate and prey selectivity by a small visually feeding fish

Figueiredo

Mormul

Benedito

2015

Mar. Freshwater Res.

View full text Add to dashboard Cite

show abstract

“…The spatial distribution of two cladoceran species, especially those with restricted niches, allow us to understand biodiversity responses of wetland littorals under changing limnological regimes.Furthermore, the morphology of the macrophytes has a significant bearing upon the availability of zooplankton as a food source, because of detritus tapping [14], and the growth of periphytic algae [15]. Consequently, the development of various macrophytes in wetlands leads to diverse cladoceran communities, and supports abundant cladoceran populations [16,17]. The heterogeneous structure of the vegetated habitat has also been demonstrated to affect the abundance of cladoceran species [18].…”

mentioning

confidence: 99%

“…Moreover, the complex structure of macrophytes can lower the predatory pressure by reducing predator feeding efficiency [12,23], and protects cladocerans against hydrological disturbance such as rainfall and high water velocity [24]. Additionally, the fecundity of cladocerans can increase because of a relatively higher availability of food in the complexly vegetated habitat, which results in the active selection of complex macrophyte species as cladoceran habitat [25].The majority of studies that have focused on the interactions between macrophytes and cladocerans have considered the role of submerged macrophytes [17,26]. These studies argued that submerged macrophytes were capable of providing a suitable habitat for cladocerans (e.g., daphniids) due to an increase of refuge space in the water.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A Study of the Distribution of Daphnia obtusa and Simocephalus vetulus in Response to Varying Environmental Conditions Using Field and Microcosm Approaches

Choi¹,

Kim²

2020

Water

View full text Add to dashboard Cite

We investigated three shallow wetlands in South Korea to understand the spatial distribution of cladoceran species (Simocephalus vetulus and Daphnia obtusa) associated with different environmental variables, through field sampling, stable isotope analysis, and an experimental approach. The surface and bottom layer of the water was occupied by surface-dwelling and submerged macrophytes, respectively, and the two cladoceran species were distributed correspondingly to the macrophyte distribution pattern. The results of a stable isotope analysis showed cladocerans’ large dependency on the particulate organic matter (POM). The microcosm experimental approach revealed that the life forms of macrophytes determined the vertical distribution of cladoceran species. A greater number of S. vetulus were found on the surface-dwelling macrophytes on the surface, whereas D. obtusa was more abundant in the bottom layer (only in submerged macrophytes) in all treatments. This distribution pattern was largely extended by predation. We identified that the varying distribution pattern would be due to the characteristic habitat utilization of each cladoceran species. Their different habitat use facilitated the coexistence of the two species. Significantly, the macrophytes were supporting the coexistence of the Cladocera species, and may play an important role in enhancing the biodiversity of the wetlands and sustaining its complex food web. The spatial distribution of two cladoceran species, especially those with restricted niches, allow us to understand biodiversity responses of wetland littorals under changing limnological regimes.

show abstract

“…As a shallower lake, if compared to Bonita lake, submerged and rooted macrophyte tend to predominate and can provide a suitable habitat for colonization by zooplankton, as discussed by Meerhoff et al (2006). These submerged macrophytes can enhance the refuge of zooplankton threatened by predators, and high phosphorus concentration can indicate food items (Stansfield et al, 1997;Muylaert et al, 2010;Choi et al, 2014).…”

Section: Factors That Structure the Alpha Diversity Of Zooplankton Comentioning

confidence: 99%

Factors that drive zooplankton diversity in Neo-Tropical Savannah shallow lakes

Padovesi-Fonseca

Rezende

2017

Acta Limnol. Bras.

View full text Add to dashboard Cite

Abstract:Zooplankton is an important community in aquatic ecosystems due to its linkage between primary producers and secondary consumers also playing a key role in cycling of organic materials. Aim: Therefore, our objective was to evaluate the effects of physicochemical variables of the water on the diversity of zooplankton community in seven tropical shallow lakes of Brazilian savannah. Methods: Zooplankton samples were taken using a bucket and filtered 200 L by a 64 µm-mesh-plankton-net, and preserved for subsequent identification. Water temperature, dissolved oxygen, pH, electrical conductivity, turbidity, chlorophyll-a, ammonium, nitrate, nitrite, total phosphorus, and soluble reactive phosphorus were measured. Results: The turbidity (decreases the temperature, luminosity and the system productivity) and ammonium (increases the toxicity) values were the major factors responsible for structuring the zooplankton community. On the other hand, also nitrogen and phosphorus (increase the productivity) are limiting in savannah lentic systems for the zooplankton. The higher α diversity was positively associated with aquatic macrophytes (increase of niches and refuge), whereas lakes with geographic proximity increase the similarity in species composition, decreasing the β diversity. Conclusions: We conclude that the deterministic processes (niche theory), due to species have different ecological requirements, are different responses to environmental gradients and increase the diversity in heterogenic lentic systems.Keywords: α diversity; β diversity; nutrients; habitat heterogeneity; lentic systems.Resumo: O zooplâncton é uma comunidade importante nos ecossistemas aquáticos por ser o elo entre os produtores primários e os consumidores secundários, além de desempenharem um papel fundamental no ciclo de materiais orgânicos. Objetivo: Nosso objetivo foi avaliar os efeitos das variáveis físicas e químicas da água na diversidade de zooplâncton em sete lagoas rasas tropicais da savana brasileira. Métodos: As amostras de zooplâncton foram coletadas usando balde e filtrando 200 litros em rede de plâncton com abertura de 64 µm, e preservadas para posterior identificação. A temperatura da água, oxigênio dissolvido, pH, condutividade elétrica, turbidez, clorofila-a, amônio, nitrato, nitrito, fósforo total, fósforo reativo solúvel, cobertura de macrófita da lamina d'água foram obtidos. Resultados: A turbidez (ao diminui a temperatura, a luminosidade e a produtividade do sistema) e os valores de amônio (por aumenta a toxicidade) foram os principais fatores responsáveis pela estruturação do zooplâncton. Por outro lado, o nitrogênio e o fósforo (por aumentar a produtividade) são limitantes para o zooplâncton nos sistemas lênticos de savana. A maior diversidade α foi associada 2 Padovesi-Fonseca, C. and Rezende, R.S.

show abstract

Untitled

Cited by 129 publications

References 0 publications

Structural complexity and turbidity do not interact to influence predation rate and prey selectivity by a small visually feeding fish

Structural complexity and turbidity do not interact to influence predation rate and prey selectivity by a small visually feeding fish

A Study of the Distribution of Daphnia obtusa and Simocephalus vetulus in Response to Varying Environmental Conditions Using Field and Microcosm Approaches

Factors that drive zooplankton diversity in Neo-Tropical Savannah shallow lakes

Contact Info

Product

Resources

About