Responses of Baltic benthic invertebrates to hypoxic events

Modig, H.; Ólafsson, Emil

doi:10.1016/s0022-0981(98)00043-4

Cited by 136 publications

(80 citation statements)

References 43 publications

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“…Such severe mortality was however observed for the macrobenthos (see Van Colen et al 2008), which, consistent with the findings of Josefson & Widbom (1988) and Mödig & Olafsson (1998), indicates a higher resistance of nematodes to hypoxic conditions as compared to the macrobenthos. Nonetheless, hypoxia adversely affected the nematode community, i.e.…”

Section: Nematode Response To Hypoxiasupporting

confidence: 87%

Tidal flat nematode responses to hypoxia and subsequent macrofauna-mediated alterations of sediment properties

Colen¹,

Montserrat²,

Verbist³

et al. 2009

Mar. Ecol. Prog. Ser.

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To assess the role of macrofauna-mediated sediment changes on nematode community recovery, we examined the temporal development of macrobenthos, nematode communities and sediment properties following hypoxia in 16 m 2 replicated plots over a 6 mo period. Hypoxia drastically changed nematode community composition (i.e. reduced diversity and abundances of all dominant nematodes, except Odontophora spp.), but complete mortality, as was the case for the macrobenthos, did not occur. Macrofauna diversity recovered slowly, but community composition approached that of control communities after several months. In contrast, nematode diversity recovered to control values within 1 mo but, subsequently, decreased again; hence, no clear convergence towards the control community composition was apparent. This diversity decline and lack of community recovery was mainly attributed to abundance overshoots of the epistrate feeding nematodes Chromadora spp., Daptonema spp. and Ptycholaimellus ponticus in the treatments, which dominated the treatment community after 2 mo. Nematode community reassembling was strongly related to the coupled macrobenthos-environmental temporal development. The dynamics of 2 sediment characteristics, which were both mediated by the colonizing macrobenthos, are presented as possible determinant factors for this relationship: (1) low nematode post-settlement resuspension resulting from stable sediments at early macrofauna recovery stages and (2) enhanced nematode reproduction and settlement success in a dense microphytobenthos mat in relation to the temporal variation in macrobenthos grazing pressure and bioturbation. In conclusion, the strong relationships between macrobenthos recovery, environmental development and nematode community development after hypoxia highlight the importance of macrobenthos-sediment interactions in the recovery and structuring of nematode communities.

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Section: Nematode Response To Hypoxiasupporting

confidence: 87%

Tidal flat nematode responses to hypoxia and subsequent macrofauna-mediated alterations of sediment properties

Colen¹,

Montserrat²,

Verbist³

et al. 2009

Mar. Ecol. Prog. Ser.

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“…After 50 d, the presence of patchy black sediment was detected in jars with only juveniles at medium respectively high food levels, suggesting occurrence of oxygen deficiency due to food decomposition. Monoporeia affinis has been classified as very sensitive to low oxygen concentrations (Johansson 1997) and has been shown to die in pulses of hypoxia (Modig & Ólafsson 1998).…”

Section: Discussionmentioning

confidence: 99%

Intraspecific competition for food within and between year classes in the deposit-feeding amphipod Monoporeia affinis-the cause of population fluctuations?

Wenngren¹,

Ólafsson²

2002

Mar. Ecol. Prog. Ser.

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We investigated whether intraspecific competition for food and/or other possible densitydependent interactions occurred within and between 2 age classes of the deposit-feeding amphipod Monoporeia affinis. A 2-factor laboratory experiment was conducted, where juveniles (0+) and adults (1+) were kept in experimental jars for 2 mo at densities of 2000, 4000 and 8000 ind. m -2 , which corresponds to natural abundances in the Baltic Sea. The amphipods were fed on a mixture of naturally occurring algae at 3 food levels: zero, medium (representing a diatom spring-bloom) and high (representing a 2 × diatom spring-bloom). The level of food added to the experimental jars determined whether food competition occurred, both within and between the 2 age classes. Growth of juveniles was not density-dependent, at any food level, in the absence of adults, but clearly dependent on presence or absence of fresh algal material. In presence of high adult densities, the growth of juveniles was significantly reduced at food levels that corresponded to a single and twice a diatom springbloom, while such reduction was not found in jars without added algae. Growth of adults was both density-and food-dependent. Juveniles did not affect the survival and growth of adults. As high densities of amphipods in jars without added food affected neither growth nor mortality, we conclude that crowding effects such as predation or directly damaging interference are not important regulating mechanisms. The results indicate that exploitative intraspecific competition for food occurs both between and within year classes, but depends on the resource levels and is likely to be most intense under a regime of low to medium input of phytodetritus. The experiment lends support to the hypothesis that intraspecific competition for food acts as an important process causing fluctuations in the Baltic Sea populations of M. affinis.

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“…Several studies showed that nematodes are generally more resistant to hypoxia than copepods (Murrell and Fleeger 1989;Modig and Olafsson 1998;Grego et al 2013;Sergeeva and Zaika 2013). Nematodes are adapted to these extreme conditions (e.g.…”

Section: Adaptation Of Meiofauna To Hypoxia and Anoxiamentioning

confidence: 99%

Characteristics of meiofauna in extreme marine ecosystems: a review

et al. 2017

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Extreme marine environments cover more than 50% of the Earth's surface and offer many opportunities for investigating the biological responses and adaptations of organisms to stressful life conditions. Extreme marine environments are sometimes associated with ephemeral and unstable ecosystems, but can host abundant, often endemic and welladapted meiofaunal species. In this review, we present an integrated view of the biodiversity, ecology and physiological responses of marine meiofauna inhabiting several extreme marine environments (mangroves, submarine caves, Polar ecosystems, hypersaline areas, hypoxic/anoxic environments, hydrothermal vents, cold seeps, carcasses/sunken woods, deep-sea canyons, deep hypersaline anoxic basins [DHABs] and hadal zones). Foraminiferans, nematodes and copepods are abundant in almost all of these habitats and are dominant in deep-sea ecosystems. The presence and dominance of some other taxa that are normally less common may be typical of certain extreme conditions. Kinorhynchs are particularly well adapted to cold seeps and other environments that experience drastic changes in salinity, rotifers are well represented in polar ecosystems and loriciferans seem to be the only metazoan able to survive multiple stressors in DHABs. As well as natural processes, human activities may generate stressful conditions, including deoxygenation, acidification and rises in temperature. The behaviour and physiology of different meiofaunal taxa, such as some foraminiferans, nematode and copepod species, can provide vital information on how organisms may respond to these challenges and can provide a warning signal of anthropogenic impacts. From an evolutionary perspective, the discovery of new meiofauna taxa from extreme environments very often sheds light on phylogenetic relationships, while understanding how meiofaunal organisms are able to survive or even flourish in these conditions can explain evolutionary pathways. Finally, there are multiple potential economic benefits to be gained from ecological, biological, physiological and evolutionary studies of meiofauna in extreme environments. Despite all the advantages offered by meiofauna studies from extreme environments, there is still an urgent need to foster meiofauna research in terms of composition, ecology, biology and physiology focusing on extreme environments.

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Responses of Baltic benthic invertebrates to hypoxic events

Cited by 136 publications

References 43 publications

Tidal flat nematode responses to hypoxia and subsequent macrofauna-mediated alterations of sediment properties

Tidal flat nematode responses to hypoxia and subsequent macrofauna-mediated alterations of sediment properties

Intraspecific competition for food within and between year classes in the deposit-feeding amphipod Monoporeia affinis-the cause of population fluctuations?

Characteristics of meiofauna in extreme marine ecosystems: a review

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