@article{fdi:010086765,
  title = {{C}ompeting with each other : fish isotopic niche in two resource availability contexts},
  author = {{P}elage, {L}. and {L}ucena-{F}redou, {F}. and {E}duardo, {L}. {N}. and {L}e {L}oc'h, {F}ran{\c{c}}ois and {B}ertrand, {A}rnaud and {L}ira, {A}. {S}. and {F}redou, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}ntroduction{C}ompetition embodies species struggle for space and food and is, therefore, a critical evolutionary mechanism influencing species spatiotemporal patterns and persistence. {O}ne of the main drivers of competition is resource availability. {I}n marine ecosystems, resource availability is determined, among other things, by habitat structural complexity, as it increases biodiversity and species abundance. {I}n this context, our study aims at understanding how the differences in substrate complexity affect potential trophic competition between demersal fishes in {N}ortheast {B}razil. {M}ethods{W}e selected two zones contrasted in terms of substrates, one dominated by sand (zone {A}) and the other by complex substrates such as reefs and calcareous algae (zone {B}). {W}e used {S}table {I}sotope {A}nalysis ({SIA}) to quantify intraspecific and interspecific interactions of demersal fishes in both zones. {W}e compared the competitive interactions between zones using social network analysis ({SNA}), a suitable method to quantitatively study a set of interactions. {R}esults{I}n the sand-dominated zone, demersal fish showed greater interspecific competition and occupied a larger isotopic niche suggesting that a resource-limited context led to diet diversification in the community. {S}ome species expanded their niche through diet plasticity, while others showed higher intraspecific competition than in {Z}one {B} to cope with the greater interspecific competition. {D}iscussion{C}ombining {SNA} and {SIA} provided a new method to investigate competition. {T}his study potentially gives a perspective on the future ecological response of the demersal fishes at the community and species level. {W}ith habitat degradation and climate change, the complex substrates in zone {B} will probably disappear gradually, transforming this zone into an ecosystem akin to zone {A}. {T}his would be detrimental to species more vulnerable to interspecific competition, particularly those targeted by fisheries.},
  keywords = {social network analysis ({SNA}) ; isotopic niche ; trophic competition ; climate change ; tropical ecosystems ; {BRESIL} ; {ATLANTIQUE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{F}rontiers in {M}arine {S}cience},
  volume = {9},
  numero = {},
  pages = {975091 [14 p.]},
  year = {2022},
  DOI = {10.3389/fmars.2022.975091},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086765},
}