Factors influencing the island‐mass effect of the Galápagos Archipelago

Palacios, Daniel M.

doi:10.1029/2002gl016232

Cited by 86 publications

(71 citation statements)

References 21 publications

(29 reference statements)

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“…The increase in biological productivity in the surrounding islands has been reported in several studies as a consequence of the island mass effect (Doty and Oguri, 1956;Palacios, 2002). Patterns of plankton biomass accumulation or productivity increase near the FNA have been frequently described (Lira et al, 2014;Tchamabi et al, 2017) and related as a consequence of the island effect.…”

Section: Discussionmentioning

confidence: 99%

Small-scale distribution of the mesozooplankton in a tropical insular system

et al. 2018

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In the present work, spatial and seasonal fluctuations of the abundance and diversity of mesozooplankton are presented, with special attention being given to copepod assemblages from coastal area of the Fernando de Noronha Archipelago (FNA) (3°50'24''S and 32°24'48''W). Sampling was carried out during the dry and rainy seasons of two consecutive years (July and December 2013) and (June and November 2014). A total of 37 mesozooplankton taxa were recorded, being the copepods the most diversified group (15 taxa). The Subclass Copepoda dominated in both periods sampled, comprising 53% and 86% of the total abundance in the dry and rainy season respectively. The species considered abundant were: Calanopia americana, Undinula vulgaris, Oithona plumifera and Corycaeus speciosus. The rainy season favored a significant increase in the abundance of mesozooplankton and copepods. However, a low value of the Shannon-Wiener diversity index was observed in this same seasonal period. This was explained by the dominance of the species C. americana and U. vulgaris in the studied area. Spatial differences have not been verified. The copepod assemblages was composed mostly by species considered as predator-carnivours of greater importance on the pelagic trophic web, indicators of oligotrophic conditions and components of a major portion of fish food items. Thus, we suggest that a spatially homogeneous mesozooplankton community characterizes the coastal area of Fernando de Noronha Archipelago with variations related mainly to the seasonal factor.

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Section: Discussionmentioning

confidence: 99%

Small-scale distribution of the mesozooplankton in a tropical insular system

et al. 2018

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“…These currents create a number of hydrogeographic regions within the islands that vary in temperature and productivity (see Glynn & Wellington 1983 for more details). Regions are separated by <150 km, but regional differences in sea surface temperature (SST) may exceed 5°C and productivity may vary 10-fold among regions (Wellington et al 2001, Palacios 2002, Ruttenberg et al 2005b. Over the scale of the entire archipelago, we divide the islands into 3 regions based on the largest differences in SST: (1) North, where temperatures are warmest, (2) West, where temperatures are coldest, and (3) Central/South (hereafter referred to as Central), where temperatures were generally intermediate between the North and West (Fig.…”

Section: Methodsmentioning

confidence: 99%

Spatial variation in the chemical composition of natal otoliths from a reef fish in the Galápagos Islands

Ruttenberg¹,

Warner²

2006

Mar. Ecol. Prog. Ser.

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Over the past decade, researchers have used variation in the chemical composition of fish otoliths (earstones) to address a number of ecological questions, such as stock assessment and assessing rates of movement of individuals among habitats or life-history stages. However, these methods have yet to be applied successfully to the study of larval connectivity, a major unanswered question in marine ecology. Accomplishing this task requires a reference collection of pre-pelagic natal otoliths and accurate measurement of the chemical signatures of otoliths cores of recruits. We analyzed the chemical composition of natal otoliths from near-term benthic eggs of a damselfish (Stegastes beebei) from all regions of the Galápagos Archipelago. There was no consistent variation in chemical signature at the largest scale, among regions in the archipelago (separated by ~100 to 150 km). However, we found significant variation among islands within each region (10s of km), and among clutches within islands. In addition, we found that otolith cores of newly settled recruits often differed chemically from natal otoliths (which ultimately make up the otolith core as the fish grows). Variation at smaller spatial scales but not larger ones implies that otolith chemistry will only be usable if larvae disperse short distances in this system, and additional work is required to understand the relationship between the chemistry of natal otoliths and recruit cores. Otolith chemistry has the potential to address questions of connectivity, but our data suggest that these methods should be applied cautiously. KEY WORDS: Otolith chemistry · Trace element · LA-ICPMS · Larval dispersal · GalápagosResale or republication not permitted without written consent of the publisher

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“…Promine nt to]Xlg raphic features in the ocean, such as island s and seamounts, are oft en associated with hi gher levels of biolog ical produ cti vity and di versit y than ope n wat ers (Pal acios 2002;Genin 20Cl4). Oceani c islands are res ponsible for the deve lopment of locali zed upwellings, eddies and conve rgence zo nes, which in tum may cause e nhanced primary producti vities and promote biomass accumulation at specific sites (Calde ira et al 2002;Palacios 2002). In addition, the islands may act as a barri er to the hori zontal dispersal of zooplankton and larval/ju ve nile fi sh that tends to become entrap ped in their vic init y (Palacios 2002), thereby increasing feeding opportunities for predators.…”

Section: Introductionmentioning

confidence: 99%