Spatial Patterns of a Lethal White Syndrome Outbreak in Pseudodiploria strigosa
Por:
Guzman-Urieta, Edgar O., Jordan-Dahlgren, Eric
Publicada:
3 sep 2021
Resumen:
We analyzed the spatial distribution patterns of a white syndrome (WS)
outbreak affecting Pseudodiploria strigosa colonies in the northern
Mexican Caribbean during 2018-2019. The purpose of the study was to
describe the outbreak progression in a single species and determine if
this WS incidence is related to the nearest diseased neighbor distance.
Two separated sites with different P. strigosa colonial densities
(Bocana: 0.08 col/m(2); Picudas: 0.2 col/m(2)) were selected in similar
habitats of the same reef complex. P. strigosa colonies within the
survey sites were mapped, and their status was recorded (healthy,
diseased, or dead) in sequential surveys until colonies died or the
study terminated (306 days). Spatial distribution modes were assessed
using Ripley's K function. The spatial colony distribution was random in
one site (Bocana) and clustered in the other (Picudas). However, the WS
disease incidence per survey was randomly distributed in both sites
throughout the observation period of the outbreak, suggesting that WS
transmission at small spatial scales was independent of the colony
distribution pattern and from the nearest diseased colonies. Survival
probability since WS onset in surveyed colonies was different: 0% at
Bocana and 14% at Picudas by April 2019. But, eventually, all diseased
colonies died in both sites. WS outbreak timing was different at the two
sites: Initial prevalence 8% at the Bocana site vs. 44% at Picudas
site. Distribution of time to disease onset shown multimodality, with
modes varying from 17 to 184 days and wide main modes amplitude suggest
a highly variable resistance to the WS. Disease incidence was not abated
during winter surveys. Differences between sites in the WS disease
outbreak distribution and progression suggest that colony condition,
environmental quality, and perhaps several transmission events played an
essential role in the complex outbreak dynamics at the local spatial
scale of our study.
Filiaciones:
Jordan-Dahlgren, Eric:
Guzman-Urieta, EO (Corresponding Author), Univ Nacl Autonoma Mexico, Inst Ciencias Mar & Limnol, Unidad Acad Sistemas Arrecifales, Puerto Morelos, Mexico. Guzman-Urieta, EO (Corresponding Author), Univ Nacl Autonoma Mexico, Posgrad Ciencias Mar & Limnol, Mexico City, DF, Mexico. Guzman-Urieta, Edgar O
Gold
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