Bacterial preferences of the bacterivorous soil nematode Cephalobus brevicauda (Cephalobidae): Effect of bacterial type and size

Salinas, Kimberly A.; Edenborn, Sherie L.; Sexstone, Alan J.; Kotcon, James B.

doi:10.1016/j.pedobi.2006.12.003

Cited by 47 publications

(26 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is known that even within a single feeding group, nematode species differ in their mouth cavity structure (Bongers, 1988), which could be related to feeding activities, resulting in the observed differences of the bacterial abundances. The highest bacterial diversity was associated with the bacterial-feeding Acrobeles (Cephalobidae), consistent with laboratory studies where bacterial-feeding nematodes from the Cephalobidae family preferentially fed on bacteria by selecting type and cell size (Salinas et al, 2007).…”

Section: Discussionsupporting

confidence: 87%

“…Such selectivity can be maintained by an ability of nematodes to distinguish chemically between the odours of different bacterial species (Grewal et al , 2006) or physically due to different size of buccal cavities of nematodes (Bongers, 1988). If bacterial cells are large or filamentous, then nematodes with a small buccal cavity are not able to consume them (Tietjen, 1980; Salinas et al , 2007).…”

Section: Discussionmentioning

confidence: 99%

“…The food choice of nematodes in soil has been described according to the morphological characteristics of their mouth parts and digestive system, which separate them into predators, bacterial‐, fungal‐, plant‐feeding or omnivorous groups (Yeates, 1971; Bongers, 1988; Yeates et al , 1993). The classification of nematodes into different feeding groups is supported by laboratory experiments where, for example, bacterial‐feeding nematodes feed on bacteria and can discriminate between gram‐negative and gram‐positive bacteria as well as bacterial size (Salinas et al , 2007). However, exceptions to the classification are common, as predatory nematodes may feed on amoebae as well as on bacteria (Elliott et al , 1980) and fungal‐feeding nematodes have been observed to feed on roots (Poinar, 1983).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Diversity of bacteria associated with grassland soil nematodes of different feeding groups

Ladygina

Johansson

Canbäck³

et al. 2009

FEMS Microbiology Ecology

View full text Add to dashboard Cite

The bacterial diversity associated with soil nematodes and its relationship with their feeding habits are as yet poorly understood. In the present study the diversity and abundance of bacteria from nematodes and their surrounding soil were analysed and compared. The nematodes were collected from a grassland soil and sorted into bacterial, fungal, plant, predatory and omnivore feeding groups and assigned to taxonomic groups. Total DNA was extracted from the nematodes and partial bacterial 16S rRNA genes were PCR amplified, cloned and sequenced. The abundance and composition of bacterial taxa differed between and within feeding groups. The lowest bacterial diversity was found in the predatory nematodes Prionchulus sp., whereas the highest bacterial diversity was associated with the bacterial-feeding nematode Acrobeles sp. The soil had a more diverse bacterial community than the communities found in the nematode groups. The 16S rRNA gene sequences of bacteria associated with nematodes did not overlap with those detected in soil as determined using the cloning screening approach. However, bacterial sequences identified from nematodes could be detected in the soil with targeted PCR. Our data suggest that the nematodes do not feed on the most abundant bacteria present in soil. Furthermore, several nematodes contained suspected bacterial symbionts and parasites.

show abstract

Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diversity of bacteria associated with grassland soil nematodes of different feeding groups

Ladygina

Johansson

Canbäck³

et al. 2009

FEMS Microbiology Ecology

View full text Add to dashboard Cite

show abstract

“…Trade‐offs between prey defence and performance are common, and the outcome of competition between resistant and sensitive prey species depends on both resource supply and predation pressure (Leibold, 1996). Prey selection by predators strongly varies with prey size (Jürgens and Simek, 2000; Salinas et al ., 2007) and, in particular at high resource availability, large bacteria are less consumed (Corno and Jurgens, 2008). Larger organisms have lower surface‐to‐volume ratios, and size is negatively correlated to resource uptake by algae (Sunda and Hardison, 2010).…”

Section: Ecological and Evolutive Implicationsmentioning

confidence: 99%

Ecological and evolutive implications of bacterial defences against predators

Jousset¹

2011

Environmental Microbiology

217

171

View full text Add to dashboard Cite

SummaryBacterial communities are often heavily consumed by microfaunal predators, such as protozoa and nematodes. Predation is an important cause of mortality and determines the structure and activity of microbial communities in both terrestrial and aquatic ecosystems, and bacteria evolved various defence mechanisms helping them to resist predation. In this review, I summarize known antipredator defence strategies and their regulation, and explore their importance for bacterial fitness in various environmental conditions, and their implications for bacterial evolution and diversification under predation pressure. I discuss how defence mechanisms affect competition and cooperation within bacterial communities. Finally I present some implications of bacterial defence mechanisms for ecosystem services provided by microbial communities, such as nutrient cycling, virulence and the biological control of plant diseases.

show abstract

“…It is plausible that this 'selective predation' is caused by size-selective feeding. Size is a common food selection criterion in meiofaunal organisms grazing bacteria (Salinas et al 2007) or microphytobenthos (Moens & Vincx 1997, De Troch et al 2006). However, size-dependent predation was not considered an important driver for the selective predation on different prey nematode species observed in a previous study with Enoploides, which contended that encounter probabilities together with the capacity of prey species for vigorous escape movements were the dominant drivers of selectivity (Moens et al 2000).…”

Section: Size-selective Predation and Predator Functional Response Almentioning

confidence: 99%

Populations of two prey nematodes and their interaction are controlled by a predatory nematode

Santos¹,

Moens²

2011

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Many nematode species are candidate predators of other nematodes. However, the impact of predation on prey population dynamics and assemblage structure is unknown. We performed microcosm experiments in which the effect of the predacious nematode Enoploides longispiculosus on the population development of 2 prey nematode species, Diplolaimelloides meyli and D. oschei, was investigated at different predator abundances. One experiment used monospecifc prey populations, another used a mixed assemblage with both prey species. With monospecific prey populations, abundances of both prey species decreased with increasing predator abundances. Sizeselective predation released small juveniles (J1, J2) completely, and older juveniles (J3, J4) partly, from predation. Since previous studies had demonstrated that D. meyli partially inhibits population development of D. oschei in the absence of predators, and Enoploides prefer D. oschei over D. meyli, we expected predation to emphasize the dominance of D. meyli over D. oschei in mixed prey populations. However, our results showed the opposite, viz. strong inhibition of D. oschei by D. meyli in control microcosms without predators, and decreasing inhibitory effects at increasing predator abundance, resulting in more equitable abundances of both prey species. Predation thus alleviated the inhibitory effect of 1 prey species over the other. We conclude that predatory nematodes like Enoploides exert pronounced effects on their prey populations, but are unlikely to drive individual prey populations to extinction. Further, predator effects on prey assemblage structure depend as much on indirect effects as on direct predator-induced prey mortality. Experiments with more complex and natural species combinations are required to allow proper assessment of the importance of the present findings for natural assemblages.

show abstract

Bacterial preferences of the bacterivorous soil nematode Cephalobus brevicauda (Cephalobidae): Effect of bacterial type and size

Cited by 47 publications

References 21 publications

Diversity of bacteria associated with grassland soil nematodes of different feeding groups

Diversity of bacteria associated with grassland soil nematodes of different feeding groups

Ecological and evolutive implications of bacterial defences against predators

Populations of two prey nematodes and their interaction are controlled by a predatory nematode

Contact Info

Product

Resources

About