Possible effects of downwelling on the recruitment of coral reef fishes to the Eilat (Red Sea) coral reefs

Kiflawi, Moshe; Gildor, Hezi; Abelson, Avigdor

doi:10.4319/lo.2007.52.6.2618

Cited by 13 publications

(16 citation statements)

References 39 publications

(51 reference statements)

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“…snail (these are gradual mortalities which can last from several weeks to a few months depending on the colony's size and the number of snails; the snails are easily observed at the edges of the dead area). Similar data on fish settlement and coral mortality were collected during 2003-2005 using the same methods (Ben-Tzvi et al 2007. each of these 5 events.…”

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confidence: 96%

“…Schools of Chromis viridis are abundant at the study site at depths of 1 to 10 m, and are found mainly in 2 Acropora species: A. eurystoma and A. hyacintus, with a preference for the former (Ben-Tzvi et al 2008). Settlement of C. viridis in the northern Gulf may occur from late May to February, in discrete events of different durations (10 to 45 d) separated by periods of similarly varying durations (Ben-Tzvi et al 2007. Although some C. viridis settle directly to their final habitat and should be considered recruits (McCormick & Makey 1997), we will use the term settlement since some of the settlers migrate a few weeks after settlement to another habitat that might become their final habitat (Ben-Tzvi et al 2008).…”

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“…Except for the water transport we did not change any parameter; the colonies were not relocated and their inhabitant stayed in the colony. Preliminary trials using fluorescein dye established that the residence time of the pumped water within the target colonies was > 30 min.With one exception, colonies were paired during periods of little or no settlement (Ben-Tzvi et al 2007). Paired colonies were monitored daily until the end of the subsequent settlement event (see Table 2 Fig.…”

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Role of coral-derived chemical cues in microhabitat selection by settling Chromis viridis

Ben-Tzvi¹,

Tchernov²,

Kiflawi³

2010

Mar. Ecol. Prog. Ser.

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Insight into the mechanisms that underlie settlement and recruitment is important for our understanding of the demography and ecology of coral reef fish and the biology of their coral host. Current knowledge of larval behaviour leading up to settlement is rather meager, and is mostly derived from controlled experiments under artificial conditions. However, it has been shown that presettlement juvenile fishes use acoustic and olfactory cues to locate the reef and, together with visual cues, to choose their first habitat in the reef. Chromis viridis (Pomacentridae) also use chemical and physical cues to locate the coral colonies on which they settle. Moreover, they appear to consistently and preferentially utilize some, but not other, conspecific colonies. To further evaluate the cues involved in microhabitat choice at settlement, we used in situ manipulation in which water from Acropora spp. coral colonies with positive settlement histories (SH+) was transferred to colonies with negative settlement histories (SH-) and vice versa. By closely monitoring settlement to manipulated and non-manipulated colonies, we found that at least 2 different water-borne cues are informing micro-habitat selection by C. viridis. Water transferred from SH-to SH+ A. hyacintus colonies was found to discourage settlement in the SH+ colonies. On the other hand, water transferred from SH+ to SH-A. eurystoma colonies encouraged settlement in the SH-colonies. These findings show that dissolved coral-derived cues dictate the fishes' settlement decisions, which raises an intriguing question as to the information content of these cues and their evolutionary context. KEY WORDS: Settlement · Coral reef fish · Odour Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 409: [181][182][183][184][185][186][187] 2010 aid in identifying and locating conspecifics (Sweatman 1988, Lecchini et al. 2005a.In a previous study (Ben-Tzvi et al. 2008), we have shown that settling Chromis viridis (Cuvier) prefer to settle with conspecific adults within Acropora spp. colonies (see also Lecchini et al. 2005b). However, not all colonies housing adults received settlers, whereas some colonies that were not inhabited by adults did receive settlers. This may not be surprising if it was not for the fact that the same colonies were consistently selected or rejected over 2 major settling events in 2004 and 2005. Although these data suggest that settling with conspecifics may not be as important as originally thought, it is not clear what drives C. viridis settlers to prefer specific colonies (whether inhabited by conspecifics or not) over others.Scleractinian corals are known to be a critical settlement habitat for many coral reef fishes, of which many are not strictly coral-dependent as adults (Jones et al. 2004, Wilson et al. 2006, Pratchett et al. 2008). Thus it is important to understand why fish select specific coral colonies and not others. Since no physical parameters were found to explain the pattern of col...

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Role of coral-derived chemical cues in microhabitat selection by settling Chromis viridis

Ben-Tzvi¹,

Tchernov²,

Kiflawi³

2010

Mar. Ecol. Prog. Ser.

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“…The usefulness of PVDs for studying coastal transport problems, then, is questionable. Despite this known limitation, PVDs have been used to examine a number of different coastal physical and biological processes including larvae dispersal (Epifanio et al 1989;Ben-Tzvi et al 2007;Fiechter et al 2008), sediment transport (Ogston et al 2004), and current variability (Berman et al 2000). Even in these applications, the limitations of PVDs often emerge.…”

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How useful are progressive vector diagrams for studying coastal ocean transport?

Carlson

Muscarella

Gildor

et al. 2010

Limnology & Ocean Methods

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Progressive vector diagrams (PVDs) have been used to estimate transport in the coastal ocean from point measurements of velocity time series, although they strictly only approximate true particle trajectories in regions where the currents are spatially uniform. Currents in most coastal regions vary significantly in both space and time, making coastal transport estimates from PVDs questionable. Here, we used synoptic surface currents measured over periods of several months by HF radars in two coastal areas with distinctly different circulation features (the Gulf of Eilat, a deep, semi-enclosed basin, and the Delaware Bay mouth, a coastal estuarine outflow) to assess the time scales over which PVD paths computed from velocity time series at fixed points separate from particle trajectories computed from two-dimensional measured horizontal currents that vary in both space and time. In both study regions, PVDs and particle trajectories separate by 1 km over a mean time period of 7-10 h with no significant month-to-month variation in either region. The separation time statistics presented here should serve as a strong caution for investigators motivated to estimate transport using only point measurements.

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“…Consequently, larval dispersal has been examined through modeling (McLay 1970;Denny 1988;Eckman 1990), comparing model results with larval distribution in the field (Reyns et al 2006), and by associating recruitment levels with currents and hydrodynamic events (Sponaugle et al 2005;Ben-Tzvi et al 2007). Denny (1988) and Denny and Shibata (1989) developed a method for predicting particle (e.g., larvae) transport times to the substratum in a turbulent boundary layer, which was refined by McNair et al (1997).…”

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Dispersion of freshwater mussel larvae in a lowland river

Schwalb

Garvie

Ackerman

2010

Limnology & Oceanography

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We examined the dispersal of larvae (glochidia) of a common unionid mussel species, Actinonaias ligamentina, which need to attach to a host fish in order to develop into juveniles, in a lowland river (Sydenham River, Ontario, Canada). Generally, the decline in the number of glochidia captured with distance from release was best described by an inverse power function. The highest proportion was found in the first net 4 m downstream (range 0.1-3.6%), but a small proportion of glochidia was captured 96 m downstream (0-0.03%). This indicates that infestation of host fish may occur several tens to hundreds of meters downstream of the adults' location, even at relatively low flow conditions (mean velocity, 15 cm s 21 ). Dispersal distances increased with velocity, but the number of glochidia sampled at a given location can vary considerably due to stochastic effects of turbulence, especially at shorter distances. Individual trials could, therefore, deviate considerably from the predictions of an existing turbulent transport model (local exchange model), but overall there was a good correlation between measured data and model prediction. However, model predictions were quantitatively much higher than measured values (i.e., . 50 fold in some cases), which could be in part due to several simplifying assumptions of the model.

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Possible effects of downwelling on the recruitment of coral reef fishes to the Eilat (Red Sea) coral reefs

Cited by 13 publications

References 39 publications

Role of coral-derived chemical cues in microhabitat selection by settling Chromis viridis

Role of coral-derived chemical cues in microhabitat selection by settling Chromis viridis

How useful are progressive vector diagrams for studying coastal ocean transport?

Dispersion of freshwater mussel larvae in a lowland river

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