Habitat of juvenile Caribbean reef sharks, Carcharhinus perezi, at two oceanic insular marine protected areas in the southwestern Atlantic Ocean: Fernando de Noronha Archipelago and Atol das Rocas, Brazil

Garla, Ricardo C.; Chapman, Demian D.; Shivji, Mahmood S.; Wetherbee, Bradley M.; Amorim, Alberto Ferreira de

doi:10.1016/j.fishres.2006.07.003

Cited by 47 publications

(37 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These studies have typically used either underwater visual survey techniques or fishing data to examine the presence and abundance of shark species at different coral reef platforms. Much of this research has focused on contrasts between human-inhabited and isolated reefs or regions that have been open or closed to fishing, and has found that in general, sharks occur more often at isolated reef sites that are closed to fishing (Friedlander & DeMartini 2002, Garla et al 2006, Robbins et al 2006, Sandin et al 2008, Nadon et al 2012. Separate from this issue are the implications of predator roles in these communities.…”

Section: Coral Reefs As a Community Case Studymentioning

confidence: 99%

Sizing up the ecological role of sharks as predators

Heupel¹,

Knip²,

Simpfendorfer³

et al. 2014

Mar. Ecol. Prog. Ser.

222

147

View full text Add to dashboard Cite

The decline of predators in a variety of ecosystems has transformed community structure through mesopredator release and trophic cascades. Elasmobranch fishes, one of the earth's most ubiquitous and diverse clade of predatory species, provide a model group for defining marine predator roles. We consider whether the ecological predatory role of sharks is adequately defined by terrestrial-derived notions of apex-and mesopredation. Indeterminate growth and ontogenetic diet shifts may mean species-level classification of predatory roles is inadequate. We propose that examining the trophic level and body size of species might be the most pragmatic and informative way to define the ecological roles of predators.

show abstract

Section: Coral Reefs As a Community Case Studymentioning

confidence: 99%

Sizing up the ecological role of sharks as predators

Heupel¹,

Knip²,

Simpfendorfer³

et al. 2014

Mar. Ecol. Prog. Ser.

222

147

View full text Add to dashboard Cite

show abstract

“…Fundamental ecological information pertaining to the diversity, distribution and abundance of sharks is vital for the development of effective management and conservation initiatives (Southwood & Henderson 2000, Garla et al 2006. However, for most species, even the most basic ecological information is lacking, which has led to 46% of sharks, skates and rays being listed as 'Data Deficient' on the IUCN Red List of Threatened Species (IUCN 2010).…”

Section: Introductionmentioning

confidence: 99%

Validating the use of baited remote underwater video surveys for assessing the diversity, distribution and abundance of sharks in the Bahamas

Brooks¹,

Sloman²,

Sims³

et al. 2011

Endang. Species. Res.

108

112

View full text Add to dashboard Cite

Baited remote underwater video surveys (BRUVS) are a novel, non-invasive method of generating relative abundance indices for a number of marine species, including sharks. This technique has become increasingly prevalent in shark ecology literature, but has yet to be formally validated against more traditional shark survey methods. BRUVS and longline surveys were conducted over 4 seasons from summer 2008 to spring 2009, in 3 habitat zones in the waters off Cape Eleuthera, The Bahamas. By the end of the project, both techniques generated similar values of species richness; however, longline surveys reached these values faster and with fewer replicates than BRUVS. Overall there was a significant positive correlation of relative abundance between the 2 survey techniques, but when analysed on a species-by-species basis, correlations were not statistically significant for the less abundant species. This suggests a threshold level of abundance, below which relative abundance estimates generated by the different survey techniques do not agree. In addition, this study identified shortcomings in the ability of BRUVS to accurately identify the species, size and sex of individuals captured on video due to the variable behaviour of the sharks in front of the camera; however, technological improvements incorporated into contemporary studies are identified which might improve data quality. BRUVS offer a non-invasive alternative to longline surveys for monitoring broad trends in the relative abundance of sharks, although in the format tested in this study they may lack the resolution required to approach finer scale, intra-species studies.

show abstract

“…The frequent catch of juvenile specimens of C. perezii by the coastal bottom longline fishery ( Fig. 1) could indicate that shallow areas of the Trindade-Martin Vaz insular complex served as nursery for this species, as has been observed at other Brazilian oceanic islands (Garla et al, 2006). This raises the concern for conservation of this species on the island.…”

Section: Discussionmentioning

confidence: 85%