@article{fdi:010044048,
  title = {{C}ultivation, {A}llee effect and resilience of large demersal fish populations},
  author = {{V}ergnon, {R}{\'e}mi and {S}hin, {Y}unne-{J}ai and {C}ury, {P}hilippe},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the marine environment, small forage species can predate on, or compete with, the pre-recruits of their larger predators. {T}he "cultivation effect" hypothesis proposes that this mechanism can slow down the recovery of depleted populations of large demersal fishes by creating {A}llee effects that lower their recruitment success. {U}sing an individual based fish community model applied to the southern {B}enguela ecosystem, we simulate situations of potential cultivation effect on a population of shallow water hake {M}erluccius capensis. {W}e search for evidence of {A}llee effects due to cultivation and investigate how complex trophic interactions could influence their underlying mechanisms and impact. {T}he resilience of the shallow water hake population was measured by following the variations of the ratio {R}/{S} (the number of recruits over the number of spawners) when population size decreases and the predators and competitors of shallow water hake pre-recruits were identified. {S}imulations suggest that cultivation effects are likely to emerge within the fish community of the southern {B}enguela ecosystem. {O}ur twelve species model emphasizes that cultivation effects result from complex influences of predation and competition on the different pre-recruit stages, whose trophic role depends on both body size and geographical distribution. {F}or realistic linkages between forage species and shallow water hake pre-recruits, cultivation effects occurring in the limits of the southern {B}enguela fish community are predicted to delay population recovery by several decades. {T}hese significant delays are not characterized by a decrease of {R}/{S} at low stock size, which is the sign usually tracked when looking for {A}llee effects. {O}ur study suggests that cultivation effects could play a major role in the dynamics of overexploited large demersal fish populations and pleads for the development of improved detection techniques for these processes.},
  keywords = {{M}arine ecosystem dynamics ; {F}ishery exploitation ; {R}ecruitment ; {S}pawning abundance ; {F}ish competitors ; {P}redators ; {M}odel ; {B}enguela system},
  booktitle = {},
  journal = {{A}quatic {L}iving {R}esources},
  volume = {21},
  numero = {3 {S}pecial {I}ssue},
  pages = {287--295},
  ISSN = {0990-7440},
  year = {2008},
  DOI = {10.1051/alr:2008042},
  URL = {https://www.documentation.ird.fr/hor/fdi:010044048},
}