The inshore fish assemblages of the Galápagos archipelago

Jennings, Simon; Brierley, Andrew S.; Walker, Jarrod

doi:10.1016/0006-3207(94)90298-4

Cited by 30 publications

(20 citation statements)

References 16 publications

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“…comm.). However it disappeared during this El Niño and has not been seen since (Jennings, Brierley & Walker, 1994;Grove & Lavenberg, 1997). Perhaps this regional disturbance had such a great impact on its food source and habitat that the fish has become extinct.…”

Section: Discussionmentioning

confidence: 98%

The threatened status of restricted‐range coral reef fish species

Hawkins¹,

Roberts²,

Clark³

2000

Animal Conservation

102

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Coral reefs are the most diverse ecosystem in the sea. Throughout the world they are being overfished, polluted and destroyed, placing biodiversity at risk. To date, much of the concern over biodiversity loss has centred on local losses and the possibility of global extinction has largely been discounted. However, recent research has shown that 24% of reef fish species have restricted ranges (< 800 000 km 2 ), with 9% highly restricted (< 50 000 km 2 ). Restricted-range species are thought to face a greater risk of extinction than more widespread species since local impacts could cause global loss. We searched for information on status in the wild and characteristics of 397 restricted-range reef fish species. Fish body size, habitat requirements and usefulness to people were compared with those of a taxonomically-matched sample of more widespread species. We found that on average species with restricted ranges were significantly smaller (mean total length 19.1 cm versus 24.4 cm), tended to have narrower habitat requirements and were less used by people. Greater habitat specificity will tend to increase extinction risk while, if real, more limited usefulness (equivalent to exploitation) may reduce risk. Fifty-eight percent of restricted-range species were considered common/abundant in the wild and 42% uncommon/rare. Population status and threats to 319 species for which data were available were assessed according to the categories and criteria of the IUCN red list of threatened animals. A number of species were found to be rare, were exploited and had highly restricted ranges overlapping areas where reef degradation is particularly severe, placing them at a high risk of extinction. Five species were listed as Critically Endangered, two of them possibly already extinct in the wild, one as Endangered and 172 as Vulnerable. A further 126 species fell into Lower Risk categories and 11 were considered Data Deficient. Given the intensity of impacts to reefs, the broad geographical areas affected and the large numbers of restricted-range species, global extinctions seem likely. Urgent management action is now crucial for the survival of several species of reef fishes.

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Section: Discussionmentioning

confidence: 98%

The threatened status of restricted‐range coral reef fish species

Hawkins¹,

Roberts²,

Clark³

2000

Animal Conservation

102

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“…In northern (~18-30ºS) Chile (only 650 km east of our study sites), pomacentrids, haemulids, and cheilodactylids dominate the fish assemblages (Angel & Ojeda, 2001;Pérez-Matus et al, 2007), and similar families dominate the Peruvian coasts (~12ºS) (Gárate & Pacheco, 2004), while notothenids dominate the southern Chilean (~50ºS) fish faunas (Moreno & Jara, 1984). At the Galápagos Archipelago (Jennings et al, 1994), three western Pacific temperate families (Pomacentridae, Labridae, and Serranidae) dominate the assemblages, although biogeographical differences occur within the archipelago (Edgar et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Subtidal reef fish and macrobenthic community structure at the temperate Juan Fernandez Archipelago, Chile

Pérez‐Matus

Ramírez

Eddy

et al. 2014

lajar

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ABSTRACT. The Juan Fernández Archipelago (33º37'S, 78º51'W), an isolated group of islands 650 km west of continental Chile, has a high degree of endemism in its marine biota. Despite numerous scientific expeditions to these islands that have identified this high endemism, few studies have attempted to identify patterns of community structure in subtidal habitats. Using visual census, we surveyed fish and habitat associations at five sites located at two of the three islands of the archipelago. Given the isolation of the archipelago we asked: What is the composition of the reef fish fauna at these isolated islands? What habitats dominate subtidal environments? What influences the abundances of reef fishes? Our analysis confirms that fish communities at the archipielago are dominated by endemic species. The ichthyofauna is comprised of a mixture of subtropical and temperate taxa, with greater similarity to western than eastern South Pacific fauna. We identified different fish assemblages at wave-exposed and wave-sheltered sites. Brown and red macroalgae were correlated with the abundances of some reef fishes. Four broad trophic categories of reef fishes were present at the archipelago, with invertebrate consumers dominating abundance. To our knowledge, this is the first attempt to quantify patterns of community structure in subtidal environments at the Juan Fernández Archipelago. Keywords: rocky reefs, fish assemblages, distribution, oceanic islands, Juan Fernández Archipelago, Chile.Estructura comunitaria del macrobentos y peces costeros submareales del archipiélago Juan Fernández, Chile RESUMEN. El archipiélago Juan Fernández (33º37'S, 78º51'W), es un grupo de islas situadas a 650 km al oeste de Chile continental, con alto grado de endemismo en su biota marina. A pesar de numerosas expediciones científicas a estas islas que han identificado este alto endemismo, pocos estudios han tratado de identificar los patrones de estructura de la comunidad en hábitats submareales. Mediante censos visuales, se registraron los peces y su asociación con el hábitat en cinco sitios de estudio, en dos de las tres islas del archipiélago. Dado el aislamiento del archipiélago nos preguntamos: ¿Cuál es la composición de la fauna de peces de arrecife en estas aisladas islas? ¿Qué hábitats dominan los ambientes submareales? ¿Qué influye en la abundancia de peces de arrecife? Los análisis realizados sugieren que la comunidad de peces en el archipiélago está dominada por especies endémicas. La ictiofauna se compone de una mezcla de taxa de origen subtropical y templado, con una mayor similitud a las especies del Pacífico occidental que a las del Pacífico suroriental. Se identificaron diferentes ensambles de peces en sitios expuestos y protegidos. Las macroalgas pardas y rojas limitaron la abundancia de algunos peces de arrecife. Cuatro categorías tróficas de peces de arrecife, estuvieron presentes en el archipiélago, siendo los invertívoros los consumidores dominantes. Hasta donde se sabe, este es el primer intento en identificar los pat...

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“…For example, fish distributions vary with respect to local topographic complexity (Risk 1972, de Boer 1978, Luckhurst & Luckhurst 1978, Carpenter et al 1981, Thresher 1983, Kaufman & Ebersole 1984, Patton et al 1985, Roberts & Ormond 1987, Grigg 1994, current flow and exposure (Talbot 1965, Hobson & Chess 1978, Williams 1982, Thresher 1983 or coral cover (Luckhurst & Luckhurst 1978, Bell & Galzin 1984, Sano et al 1987, Bell et al 1985a, Bouchon-Navaro et al 1985 et al. 1988) and, on a wider basis, with respect to geographic region or reef area (Williams 1982, Russ 1984a, b, Galzin 1987, Kulbicki 1988, Jennings et al 1994.…”

Section: Introductionmentioning

confidence: 97%

Habitat correlates of the distribution and biomass of Seychelles' reef fishes

1996

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SynopsisRelationships between quantitative measures of habitat type and the biomass of Chaetodon, Scarus and Parupeneus species were investigated across 35 reef sites in the Inner Seychelles Group. Multiple regression was used to determine the proportion of variance in biomass between sites which could be explained by depth, exposure, vertical relief, topographic complexity, live coral cover, coral rubble cover, rock cover, sand cover, underlying carbonate substrate, underlying sand substrate, underlying rock substrate and an index of fishing intensity. A significant proportion of the variance in biomass was explained by habitat variables and the index of fishing intensity for 7 of 12 Chaetodon species (23-52% of variance explained), 3 of 6 Parupeneus species (33-40%), and 10 of 13 Scarus species (1446%). Within genera, different groups of habitat variables explained the variance in biomass for different species and, of the variables studied, only the proportion of underlying sand substrate failed to explain a significant proportion of the variance in biomass for any species. Quantitative relationships between the biomass of Chaetodon and habitat were often in accordance with those suggested by previous studies of their ecology, life-history and distribution at other Indo-Pacific locations. However, the habitat associations of the Parupeneus and some Scarus species have not been studied at other locations and clearly warrant further investigation. It was concluded that habitat was an important determinant of the distribution of many Seychelles reef fishes, but that the habitat variables examined were rarely the most important determinant of biomass. However, the inclusion of a procedure to collect habitat data provided a useful means by which to reduce the unexplained variance associated with visual census biomass estimates and therefore improves the possibility of elucidating the effects of other factors on the biomass of Seychelles reef fishes.

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The inshore fish assemblages of the Galápagos archipelago

Cited by 30 publications

References 16 publications

The threatened status of restricted‐range coral reef fish species

The threatened status of restricted‐range coral reef fish species

Subtidal reef fish and macrobenthic community structure at the temperate Juan Fernandez Archipelago, Chile

Habitat correlates of the distribution and biomass of Seychelles' reef fishes

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