Effects of cadmium on the fitness of, and interactions between, two bacterivorous nematode species

Martinez, Joey Genevieve; Santos, Giovanni dos; Derycke, Sofie; Moens, Tom

doi:10.1016/j.apsoil.2012.02.001

Cited by 16 publications

(14 citation statements)

References 69 publications

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“…Also in the 1-1.5 cm layer of normoxia the abundances were significantly higher with RB. The presence of lower numbers of live -CTG-labelled -nematodes in top normoxic layer might reflect the short generation time of some species, namely days to weeks (Platt et al, 1985;Martinez et al, 2012). Even though the decomposition is relatively fast (Kammenga et al, 1996), nematodes do not disintegrate within hours/days; therefore the density of living nematodes may be overestimated in ecological/monitoring studies based solely on RB staining.…”

Section: Meiofauna Densitiesmentioning

confidence: 99%

CellTracker Green labelling vs. rose bengal staining: CTG wins by points in distinguishing living from dead anoxia-impacted copepods and nematodes

et al. 2013

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Abstract. Hypoxia and anoxia have become a key threat to shallow coastal seas. Much is known about their impact on macrofauna, less on meiofauna. In an attempt to shed more light on the latter group, in particular from a process-oriented view, we experimentally induced short-term anoxia (1 week) in the northern Adriatic Sea (Mediterranean) and examined the two most abundant meiofauna taxa – harpacticoid copepods and nematodes. Both taxa also represent different ends of the tolerance spectrum, with copepods being the most sensitive and nematodes among the most tolerant. We compared two methods: CellTracker Green (CTG) – new labelling approach for meiofauna – with the traditional rose bengal (RB) staining method. CTG binds to active enzymes and therefore colours live organisms only. The two methods show considerable differences in the number of living and dead individuals of both meiofauna taxa. Generally, RB will stain dead but not yet decomposed copepods and nematodes equally as it does live ones. Specifically, RB significantly overestimated the number of living copepods in all sediment layers in anoxic samples, but not in any normoxic samples. In contrast, for nematodes, the methods did not show such a clear difference between anoxia and normoxia. RB overestimated the number of living nematodes in the top sediment layer of normoxic samples, which implies an overestimation of the overall live nematofauna. For monitoring and biodiversity studies, the RB method might be sufficient, but for more precise quantification of community degradation, especially after an oxygen depletion event, CTG labelling is a better tool. Moreover, it clearly highlights the surviving species within the copepod or nematode community. As already accepted for foraminiferal research, we demonstrate that the CTG labelling is also valid for other meiofauna groups.

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Section: Meiofauna Densitiesmentioning

confidence: 99%

CellTracker Green labelling vs. rose bengal staining: CTG wins by points in distinguishing living from dead anoxia-impacted copepods and nematodes

et al. 2013

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“…Different responses among genera in the same trophic group are common (Porazinska et al, 1999), and nematode genera within the same trophic group can exhibit asymmetric competition, negatively influencing the abundance of other genera (Postma-Blaauw et al, 2005). Such interaction outcome may be due to the limited similar food source, which resulted to competition and resource depletion, and in turn increased the competition between species (Martinez et al, 2012). Eventually, uninterrupted competition may lead to inhibition where individuals of one species suffer a reduction in growth, survivorship and fecundity as a consequence of resource exploitation or interference of the other species (Begon et al, 1996;Keddy, 2001).…”

Section: Resultsmentioning

confidence: 99%

“…Sublethal Cd concentrations used in the study were 1.4 mg L -1 and 1.9 mg L -1 . Sublethal concentrations were determined based on the LC 50 of Cd on both A. nanus and P. parvus (Martinez et al, 2012). Using a fine copper wire, five A. nanus and five B. monhystera adults were selected and placed in the partitioned Petri dish (monoculture set-up), and a combination of the nematode species (5 A. nanus : 5 B. monhystera) was placed in full Petri dish (interaction set-up).…”

Section: Preparation Of a Nematode Culturementioning

confidence: 99%

“…A study of Martinez et al (2012) demonstrated that sublethal pollution level can change the interaction of two nematode species, P. parvus and A. nanus owing to their differential tolerance -P. parvus being the more sensitive species than A. nanus, leading to counterintuitive result such as increase in A. nanus fitness during pollution.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, it has been shown that nematodes are appropriate bioindicators of soil condition, and they are also suitable organisms for laboratory toxicity testing (Sochova et al, 2006). Nematodes offer perspectives for ecotoxicological research because of their abundance, species diversity and differences in sensitivity to chemicals (Kammenga et al, 1994) such as cadmium (Alvarez et al, 2006;Kammenga et al, 1994Kammenga et al, , 1996Martinez et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Cadmium on the Interactions between Bacterivorous Nematode Species, Acrobeloides

Bendoy

Tumang

Moneva

et al. 2014

JMDS

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Interactions of species have been recognized to play an important role in the structure and functioning of the environment. However, the exact mechanism is not well understood particularly under shifting environmental conditions like pollution. To determine the effects of pollutants/contaminants on the fitness of two soil nematodes (Acrobeloides nanus and Bursilla monhystera) under pristine and polluted condition, we performed experimental set-ups (monoculture and combined cultures) and exposed the organisms to varying sublethal cadmium (Cd) concentrations (0 mg/L, 1.4 mg/L and 1.9 mg/L). In monoculture, results showed continuous increase in the abundances of A. nanus and B. monhystera in non-polluted condition. Abundance of A. nanus remained increased in polluted condition, however, B. monhystera responded negatively to increasing Cd concentrations. In combination, results in non-polluted condition showed that B. monhystera exhibited a negative effect on the abundance of A. nanus, suggesting that B. monhystera is a stronger competitor than A. nanus. However, a shift in abundance pattern was observed when both species were exposed to pollutants particularly on the positive effect by A. nanus on B. monhystera which implies that sublethal Cd concentrations can potentially alter species interactions. Thorough assessment of nematode interactions is essential in explaining patterns of community structure in disturbed systems and determining proper functioning in the ecosystem.

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Effects of Mercury (Hg) on Soil Nematodes: A Microcosm Approach

Martinez

Quiobe

Moens

2019

Arch Environ Contam Toxicol

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Effects of cadmium on the fitness of, and interactions between, two bacterivorous nematode species

Cited by 16 publications

References 69 publications

CellTracker Green labelling vs. rose bengal staining: CTG wins by points in distinguishing living from dead anoxia-impacted copepods and nematodes

CellTracker Green labelling vs. rose bengal staining: CTG wins by points in distinguishing living from dead anoxia-impacted copepods and nematodes

Effects of Cadmium on the Interactions between Bacterivorous Nematode Species, Acrobeloides

Effects of Mercury (Hg) on Soil Nematodes: A Microcosm Approach

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