@article{fdi:010076039, title = {{F}ringing reefs of {R}eunion {I}sland and eutrophication effects. {P}art 1: {L}ong-term monitoring of two shallow coral reef communities}, author = {{T}ourrand, {C}. and {N}aim, {O}. and {B}igot, {L}. and {C}adet, {C}. and {C}auvin, {B}. and {S}emple, {S}. and {M}ontaggioni, {L}.{F}. and {C}habanet, {P}ascale and {B}ruggemann, {H}.}, editor = {}, language = {{ENG}}, abstract = {{T}his study assesses changes in subtidal benthic communities on the largest reef flat in {R}eunion, {S}aint-{G}illes {L}a {S}aline, using several types of surveys. {T}emporal and spatial trends are documented over a 22 year period (1987-2009), thus spanning the 1998 and 2000s bleaching events. {T}he most plausible explanations for the observed trends are proposed. {W}e chose two sites that are characterized by two types of community and metabolism: (1) an oligotrophic site dominated by {A}cropora corals ({S}ite-{T}oboggan), where sea-urchins are numerous and macroalgae rare and (2) a dystrophic site dominated by non-{A}cropora corals, mostly massive and submassive, where macroalgae abound and sea-urchins are almost absent ({S}ite-{P}lanch’{A}liz{\'e}s). {R}esults are presented in three parts : {P}art 1 : general trends of the communities, part 2 : primary producers, part 3 : living corals. {P}art 1 presents three surveys. {S}urvey 1 reports status and trends across the reef flats in 1993, 1996, and 2002, with all attached benthic components reported at the level of the species where possible. {S}urvey 2 reports composition and changes in associated sedentary organisms such as sea urchins, holothurids, and the {P}omacentridae fish {S}tegastes. {S}urvey 3 focuses on the period 1998 to 2009 on permanent transects established in 1987 and monitored periodically, partly as a contribution to the {G}lobal {C}oral {R}eef {M}onitoring {N}etwork ({GCRMN}). {I}n general, community structures at both locations remained stable, with primary producer coverage around 5% at {T}oboggan ({T}) and around 60% at {P}lanch’{A}liz{\'e}s ({P}). {L}iving coral coverage averaged around 17% at both sites, but it was dominated by {A}cropora on {S}ite-{T} (68%) and by massive corals on {S}ite-{P} (88%). {R}egular echinoids were very abundant at {T} but almost absent from {P}, while the opposite was true for holothurids. {T}he territorial damselfish {S}tegastes was of comparable abundance at both sites (<1 individuals per m2). {T}here were large changes in coral cover in some zones, especially due to growth in {A}cropora from 1993 to 2002. {O}n the two {GCRMN} permanent transects, 1999 and 2004 were turning points, so results are reported in three blocks: 1987-98, 1999-2003 and 2004-09. {F}rom 1987 to 1998 primary producers were inconspicuous on {T} transect but increased after that, suggesting abiotic conditions had become more favorable to algae. {O}n the other transect ({P}-one), algae began to decline from 1999 and massive corals increased. {P}ossible causes for these changes are discussed.}, keywords = {{RECIF} {FRANGEANT} ; {CORAIL} ; {POISSON} {MARIN} ; {INVERTEBRE} {AQUATIQUE} ; {OURSIN} ; {BENTHOS} ; {ASSOCIATION} {D}'{ESPECES} ; {PRODUCTION} {PRIMAIRE} ; {HOLOTHURIE} ; {REUNION}}, booktitle = {}, journal = {{A}toll {R}esearch {B}ulletin}, numero = {596}, pages = {35}, ISSN = {0077-5630}, year = {2013}, DOI = {10.5479/si.00775630.596}, URL = {https://www.documentation.ird.fr/hor/fdi:010076039}, }