Varying reef shark abundance trends inside a marine reserve: evidence of a Caribbean reef shark decline

Kathryn I. Flowers, Elizabeth A. Babcock, Yannis P. Papastamatiou, Mark E. Bond, Norlan Lamb, Ashbert Miranda, Randolph Nunez, Jasmine Valentin-Albanese, Gina M. Clementi, Megan C. Kelley, Demian D. Chapman

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Spatial comparisons of reef shark abundance inside and outside marine protected areas (MPAs) are common and generally report positive MPA effects, yet few studies have tracked abundance trends over long time periods. This is problematic because inside:outside comparisons at a single point in time cannot evaluate whether populations are declining. In Belize, the Caribbean reef shark Carcharhinus perezi is one of the most fished shark species and is more abundant inside MPAs. Although the relative abundance of C. perezi was stable inside Glover's Reef Marine Reserve (GRMR) from 2001 to 2013, using standard baited remote underwater video station surveys, we document a decline in relative abundance inside the no-take marine reserve from 2009 to 2019. We used a negative binomial generalized linear model and model averaging to test the ef fect of year, depth, and water temperature on C. perezi and nurse shark Ginglymostoma cirratum relative abundance. While model-averaged results indicated a C. perezi decline, G. cirratum remained stable from 2009 to 2019. We hypothesize that the C. perezi decline is a result of fishing along the edge of GRMR, while G. cirratum stability is related to their behavior and nationwide protection. Given the dynamic nature of fisheries regulations, economic pressures, and sitespecific environmental conditions, our results emphasize the need for standardized long-term monitoring of reef sharks inside and around MPAs globally.

Original languageEnglish (US)
Pages (from-to)97-107
Number of pages11
JournalMarine Ecology Progress Series
Volume683
DOIs
StatePublished - 2022
Externally publishedYes

Keywords

  • Baited remote underwater video stations
  • Carcharhinus perezi
  • Ginglymostoma cirratum
  • Glover's Reef Marine Reserve
  • Marine protected area
  • Shark relative abundance

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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