Demographic patterns in the peacock grouper (Cephalopholis argus), an introduced Hawaiian reef fish

Donovan, Mary K.; Friedlander, Alan M.; DeMartini, Edward E.; Donahue, Megan J.; Williams, Ivor D.

doi:10.1007/s10641-012-0095-1

Cited by 11 publications

(6 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These local influences can translate to spatial differences in growth rates and maturation schedules of reef fishery resources (Donovan, Friedlander, DeMartini, Donahue, & Williams, 2013;Gust, 2004;Taylor et al, 2015). Western scientific management guidelines and customary management practices thus converge on the need for management at the local scale.…”

Section: Discussionmentioning

confidence: 99%

Human‐induced gradients of reef fish declines in the Hawaiian Archipelago viewed through the lens of traditional management boundaries

Friedlander

Donovan

Stamoulis

et al. 2017

Aquatic Conservation

Self Cite

View full text Add to dashboard Cite

1. Large declines in reef fish populations in Hawai'i have raised concerns about the sustainability of these resources, and the ecosystem as a whole. To help elucidate the reasons behind these declines, a comprehensive examination of reef fish assemblages was conducted across the entire 2500 km Hawaiian Archipelago.2. Twenty-five datasets were compiled, representing >25 000 individual surveys conducted throughout Hawai'i since 2000. To account for overall differences in survey methods, conversion factors were created to standardize among methods.3. Comparisons of major targeted resource species (N = 35) between the densely populated main (MHI) and remote north-western Hawaiian Islands (NWHI) revealed that 40% of these species had biomass in the MHI below 25% of NWHI levels. In total, 54% of the species examined had biomass <50% of NWHI biomass. 4. The moku or district was a basic unit of resource management in pre-contact Hawai'i and was used as a unit of spatial stratification for comparisons within the MHI. Biomass of resource species was negatively correlated with human population density within moku boundaries, with extremely low biomass in areas with highest human population densities. No such relationship was found for species not targeted by fishing. 5. A number of remote areas with small human populations in the MHI still support high standing stock of fished species, and these areas are likely important refugia for maintaining fisheries production and biodiversity functioning.6. These results highlight the large gradient of human impacts on fish assemblages across the Hawaiian Archipelago and the potential in using landscape and seascape units, such as those that are watershed and bio-physically-based, when managing in part based on a framework of traditional ecological knowledge.

show abstract

Section: Discussionmentioning

confidence: 99%

Human‐induced gradients of reef fish declines in the Hawaiian Archipelago viewed through the lens of traditional management boundaries

Friedlander

Donovan

Stamoulis

et al. 2017

Aquatic Conservation

Self Cite

View full text Add to dashboard Cite

show abstract

“…For many species, we had to use life history parameters from other Pacific areas. It is possible that these values change geographically and with environmental conditions ([ 47 , 48 ], although see [ 49 ]). The availability of an extensive underwater visual survey dataset for the relatively pristine NWHI allowed us to evaluate the validity of the length-based mortality model used in this study [ 16 , 19 ] as well as the validity of our life history information.…”

Section: Discussionmentioning

confidence: 99%

Length-Based Assessment of Coral Reef Fish Populations in the Main and Northwestern Hawaiian Islands

et al. 2015

Self Cite

View full text Add to dashboard Cite

The coral reef fish community of Hawaii is composed of hundreds of species, supports a multimillion dollar fishing and tourism industry, and is of great cultural importance to the local population. However, a major stock assessment of Hawaiian coral reef fish populations has not yet been conducted. Here we used the robust indicator variable “average length in the exploited phase of the population ()”, estimated from size composition data from commercial fisheries trip reports and fishery-independent diver surveys, to evaluate exploitation rates for 19 Hawaiian reef fishes. By and large, the average lengths obtained from diver surveys agreed well with those from commercial data. We used the estimated exploitation rates coupled with life history parameters synthesized from the literature to parameterize a numerical population model and generate stock sustainability metrics such as spawning potential ratios (SPR). We found good agreement between predicted average lengths in an unfished population (from our population model) and those observed from diver surveys in the largely unexploited Northwestern Hawaiian Islands. Of 19 exploited reef fish species assessed in the main Hawaiian Islands, 9 had SPRs close to or below the 30% overfishing threshold. In general, longer-lived species such as surgeonfishes, the redlip parrotfish (Scarus rubroviolaceus), and the gray snapper (Aprion virescens) had the lowest SPRs, while short-lived species such as goatfishes and jacks, as well as two invasive species (Lutjanus kasmira and Cephalopholis argus), had SPRs above the 30% threshold.

show abstract

“…Age at L T for each sample was calculated using an age-length key from aged C. argus collected in Puako, Hawaii from July-November 2011 (Donovan et al, 2013). The age-length key was created following methods from Kimura (1977), where the aged samples were divided into 3 cm bins ranging from the minimum to the maximum L T of the un-aged sample and calculating the probability of age given the L T interval.…”

Section: S E X Ua L M At U R I T Y a N D S E X C H A N G Ementioning

confidence: 99%

“…Knowledge of the biology of C. argus is, however, currently limited to studies on social structure, territoriality, movement and growth from Hawaii (Meyer & Dierking, 2011;Donovan et al, 2013;Giddens et al, 2014) and across their native range (Shpigel & Fishelson, 1989;Pears, 2005;Meyer, 2008), but nothing is known about their reproductive biology. Cephalopholis argus is reef associated and common in exposed reef habitats up to 40 m (Choat et al, 2011), and is known to form social groups with one male and several females occupying individual territories within the male's larger territory (Shpigel & Fishelson, 1989;Meyer, 2008).…”

Section: Introductionmentioning

confidence: 99%

Reproductive life history of the introduced peacock grouper Cephalopholis argus in Hawaii

Schemmel

Donovan

Wiggins

et al. 2016

Journal of Fish Biology

View full text Add to dashboard Cite

This research investigated the reproductive biology (sex ratio, hermaphroditic pattern, size and age at maturity) of Cephalopholis argus, known locally in Hawaii by its Tahitian name roi. The results suggest that C. argus exhibits monandric protogyny (female gonad differentiation with female to male sex change) with females reaching sexual maturity at 1.2 years (95% c.i.: 0.6, 1.6) and 20.0 cm total length (LT ; 95% c.i.: 19.6, 21.2). The female to male sex ratio was 3.9:1. The average age and LT at sex change was 11.5 years (95% c.i.: 11.1, 12.9) and 39.9 cm (95% c.i.: 39.5, 41.2), respectively. Current information on spawning seasonality of this species is incomplete, but based on the occurrence of spawning capable and actively spawning females, spawning probably takes place from May to October. Evidence of lunar spawning periodicity was found, with an increased proportion of spawning capable and actively spawning females, and an increased female gonado-somatic index during first quarter and full-moon phases. This information fills a valuable information gap in Hawaii and across the species' native range.

show abstract

Demographic patterns in the peacock grouper (Cephalopholis argus), an introduced Hawaiian reef fish

Cited by 11 publications

References 58 publications

Human‐induced gradients of reef fish declines in the Hawaiian Archipelago viewed through the lens of traditional management boundaries

Human‐induced gradients of reef fish declines in the Hawaiian Archipelago viewed through the lens of traditional management boundaries

Length-Based Assessment of Coral Reef Fish Populations in the Main and Northwestern Hawaiian Islands

Reproductive life history of the introduced peacock grouper Cephalopholis argus in Hawaii

Contact Info

Product

Resources

About