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Differences in life-histories refute ecological equivalence of cryptic species and provide clues to the origin of bathyal Halomonhystera (Nematoda)

Jelle Van Campenhout (UGent) , Sofie Derycke (UGent) , Tom Moens (UGent) and Ann Vanreusel (UGent)
(2014) PLOS ONE. 9(11).
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Abstract
The discovery of morphologically very similar but genetically distinct species complicates a proper understanding of the link between biodiversity and ecosystem functioning. Cryptic species have been frequently observed to co-occur and are thus expected to be ecological equivalent. The marine nematode Halomonhystera disjuncta contains five cryptic species (GD1-5) that co-occur in the Westerschelde estuary. In this study, we investigated the effect of three abiotic factors (salinity, temperature and sulphide) on life-history traits of three cryptic H. disjuncta species (GD1-3). Our results show that temperature had the most profound influence on all life-cycle parameters compared to a smaller effect of salinity. Life-history traits of closely related cryptic species were differentially affected by temperature, salinity and presence of sulphides which shows that cryptic H. disjuncta species are not ecologically equivalent. Our results further revealed that GD1 had the highest tolerance to a combination of sulphides, high salinities and low temperatures. The close phylogenetic position of GD1 to Halomonhystera hermesi, the dominant species in sulphidic sediments of the Hakon Mosby mud volcano (Barent Sea, 1280 m depth), indicates that both species share a recent common ancestor. Differential life-history responses to environmental changes among cryptic species may have crucial consequences for our perception on ecosystem functioning and coexistence of cryptic species.
Keywords
BRACKISH-WATER NEMATODES, FREE-LIVING MARINE, MOSBY-MUD-VOLCANO, MONHYSTERA-DISJUNCTA, PELLIODITIS-MARINA, BRACHIONUS-PLICATILIS, NICHE CONSERVATISM, GENETIC-STRUCTURE, TEMPERATURE, COEXISTENCE

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Citation

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Chicago
Van Campenhout, Jelle, Sofie Derycke, Tom Moens, and Ann Vanreusel. 2014. “Differences in Life-histories Refute Ecological Equivalence of Cryptic Species and Provide Clues to the Origin of Bathyal Halomonhystera (Nematoda).” Plos One 9 (11).
APA
Van Campenhout, Jelle, Derycke, S., Moens, T., & Vanreusel, A. (2014). Differences in life-histories refute ecological equivalence of cryptic species and provide clues to the origin of bathyal Halomonhystera (Nematoda). PLOS ONE, 9(11).
Vancouver
1.
Van Campenhout J, Derycke S, Moens T, Vanreusel A. Differences in life-histories refute ecological equivalence of cryptic species and provide clues to the origin of bathyal Halomonhystera (Nematoda). PLOS ONE. 2014;9(11).
MLA
Van Campenhout, Jelle, Sofie Derycke, Tom Moens, et al. “Differences in Life-histories Refute Ecological Equivalence of Cryptic Species and Provide Clues to the Origin of Bathyal Halomonhystera (Nematoda).” PLOS ONE 9.11 (2014): n. pag. Print.
@article{5974091,
  abstract     = {The discovery of morphologically very similar but genetically distinct species complicates a proper understanding of the link between biodiversity and ecosystem functioning. Cryptic species have been frequently observed to co-occur and are thus expected to be ecological equivalent. The marine nematode Halomonhystera disjuncta contains five cryptic species (GD1-5) that co-occur in the Westerschelde estuary. In this study, we investigated the effect of three abiotic factors (salinity, temperature and sulphide) on life-history traits of three cryptic H. disjuncta species (GD1-3). Our results show that temperature had the most profound influence on all life-cycle parameters compared to a smaller effect of salinity. Life-history traits of closely related cryptic species were differentially affected by temperature, salinity and presence of sulphides which shows that cryptic H. disjuncta species are not ecologically equivalent. Our results further revealed that GD1 had the highest tolerance to a combination of sulphides, high salinities and low temperatures. The close phylogenetic position of GD1 to Halomonhystera hermesi, the dominant species in sulphidic sediments of the Hakon Mosby mud volcano (Barent Sea, 1280 m depth), indicates that both species share a recent common ancestor. Differential life-history responses to environmental changes among cryptic species may have crucial consequences for our perception on ecosystem functioning and coexistence of cryptic species.},
  articleno    = {e111889},
  author       = {Van Campenhout, Jelle and Derycke, Sofie and Moens, Tom and Vanreusel, Ann},
  issn         = {1932-6203},
  journal      = {PLOS ONE},
  language     = {eng},
  number       = {11},
  pages        = {14},
  title        = {Differences in life-histories refute ecological equivalence of cryptic species and provide clues to the origin of bathyal Halomonhystera (Nematoda)},
  url          = {http://dx.doi.org/10.1371/journal.pone.0111889},
  volume       = {9},
  year         = {2014},
}

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