Cross-continent comparisons reveal differing environmental drivers of growth of the coral reef fish, Lutjanus bohar

Ong, Joyce J.L.; Rountrey, Adam N.; Marriott, Ross J.; Newman, Stephen J.; Meeuwig, Jessica J.; Meekan, Mark G.

doi:10.1007/s00338-016-1520-2

Cited by 13 publications

(6 citation statements)

References 56 publications

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“…1). Furthermore, the unpublished data from WA is supported with an approach similar to dendrochronology where identifiable growth events were well-correlated in time (e.g., Ong et al, 2016). Longevity is lower than originally estimated by Scofield (2013) and may be closer to 30 years in Hawaii.…”

Section: Fisheries and Aquatic Sciencessupporting

confidence: 57%

“…The reason for this approach is to use the different forms of growth structure (alternating densities due to inclusion of otolin; Campana, 1999) in which angled light transmitted through the otolith can exploit variations in diffraction indices of the otolith matrix -the Leica stereo microscope S8 APO outfitted with the Rotterman Contrast TM transmitted light base (TL4000 RC) is an optimal system for taking advantage of this otolith section artifact to view growth zone structure that is simply not visible with direct transmission (perpendicular to the otolith plane) of light through the otolith section. However, a technique used by Ong et al (2016) described a method that used a brightfield on thin sectioned otoliths (0.15-0.19 mm) and the growth zone structure was clearly visible. While the older growth zones were fairly well defined for gindai in thicker sections, the problems with grouping early zones may not be solved with ultra-thin sections.…”

Section: Resultsmentioning

confidence: 99%

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Early overcounting in otoliths: a case study of age and growth for gindai (Pristipomoides zonatus) using bomb 14C dating

Andrews¹,

Scofield²

2021

Fish Aquat Sci

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Gindai (Pristipomoides zonatus) is one of six snappers in a management complex called the Deep 7 of the Hawaiian Islands. Little is known about its life history and a preliminary analysis of otolith thin sections indicated the species may exhibit moderate growth with a lifespan approaching 40 years. Preliminary age estimates from the previous study were reinvestigated using the same otolith sections in an attempt to validate those ages with bomb radiocarbon (14 C) dating. From the misalignment of birth years for the otolith 14 C measurements with regional references-the post-peak bomb 14 C decline period-it was concluded that previous ages were inflated from overcounting of the earliest growth zone structure in otolith sections. The oldest gindai was re-aged to 26 years once the age reading was adjusted for early overcounting, 13 years younger than the original estimate of 39 years for this fish. In general, the earliest otolith growth of gindai was massive and complicated by numerous subannual checks. The approach of lumping the early growth structures was supported by the alignment of 14 C measurements from otolith core material (first year of growth). The result was greater consistency of calculated birthdates with the 14 C decline reference, along with minor offsets that may indicate age estimation was imprecise by a few years for some individuals. The revised von Bertalanffy growth function applied to the validated age-at-length estimates revealed more rapid growth (k = 0.378 cf. 0.113) and a lifespan of approximately 30 years. The findings presented here are a case study of how the bomb 14 C decline period can be used as a tool in the refinement of age reading protocols.

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Section: Fisheries and Aquatic Sciencessupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Early overcounting in otoliths: a case study of age and growth for gindai (Pristipomoides zonatus) using bomb 14C dating

Andrews¹,

Scofield²

2021

Fish Aquat Sci

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“…Variation in demographics among reefs within a latitude may be due to factors such as the density of conspecifics, availability of prey and predatory regimes. Ong et al [37] examined differences between Lutjanus bohar populations at the same latitude from the and west coast of Australia. They argued that the differences they found local factors such as oceanography and ecological differences were the primary drivers of differences in demographics.…”

Section: Discussionmentioning

confidence: 99%

“…Our findings concur with other studies that variation in environmental conditions within a latitude can have a strong influence on demographic characteristics and in some cases this variation can be a great as some purported 'gradient models'. For example, Ong et al [37] studied spatial patterns in the growth variability of Lutjanus bohar over a similar latitudinal range in tropical waters, they concluded that the major drivers were variation in local climatic patterns (e.g., oceanography) and biological factors. Similarly, Gust et al [19] found differences in size and age-maxima of scarids between mid and outer reefs of the GBR over a narrow latitudinal range.…”

Section: Discussionmentioning

confidence: 99%

Latitudinal and Cross-Shelf Patterns of Size, Growth and Mortality of a Tropical Damselfish Acanthochromis polyacanthus on the Great Barrier Reef

Kingsford¹,

Welch²,

O’Callaghan³

2018

Preprint

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Patterns of age and growth of a sedentary damsel fish Acanthochromis polyacanthus were tested over a latitudinal range of approximately 10 degrees (1,200 km) on the Great Barrier Reef, Australia. Within latitudes these patterns were also compared on reefs across a continental shelf that ranged in width from 52 to 128 km. Although variation in length-max, growth, age-max and the von-Bertalanffy metrics of L, and K were found within and among latitudes, greatest variation in some demographic characteristics were found across the shelf regardless of latitude. Fish were always smaller at inner shelf reefs and grew more slowly when compared to mid and outer shelf reefs. The oldest fish collected was 11 years old and, there were no consistent variation in age-max among distances from shore. On outer reefs, there was a linear relationship with age-max and latitude. This ‘tropical gradient’ of age only explained 34% of the variation, further this was not found when the oldest 10% of fish were considered. Fish only reached an age-max of 6 years on the southern-most reefs. There was a trend for a smaller L with latitude but, it was not significant and L did not vary predictably with water temperature. The sampling of MPAs did not confound the resultant patterns. Instantaneous mortality rates were 0.245-0.685, highest at inner reefs and showed no consistent MPA-related patterns. Our study suggested that the mid and outer shelf waters of the GBR appeared best suited for growth of A. polyacanthus. In conclusion, position on continental shelves and related local environmental conditions needs to be considered in spatial models of growth.

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“…Variation in demographics among reefs within a latitude may be due to factors such as the density of conspecifics, availability of prey, and predatory regimes. Ong et al [42] examined differences in otolith increment spacing, as a proxy for growth, between Lutjanus bohar populations at the same latitude from the west coast of Australia. They argued that the differences they found in local factors such as oceanography and ecological differences were the primary drivers of differences in demographics.…”

Section: Discussionmentioning

confidence: 99%

Latitudinal and Cross-Shelf Patterns of Size, Age, Growth, and Mortality of a Tropical Damselfish Acanthochromis polyacanthus on the Great Barrier Reef

2019

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Patterns of age and growth of a sedentary damsel fish Acanthochromis polyacanthus were tested over a latitudinal range of approximately 10 degrees (1200 km) on the Great Barrier Reef (GBR), Australia. Within latitudes, these patterns were also compared on reefs in distance strata (inner, mid, and outer) across a continental shelf that ranged in width from 52 to 128 km. Although variation in length-max (SLMAX), growth, age-max (AMAX), and the von Bertalanffy metrics of Linf and K were found within and among latitudes, the greatest variation in some demographic characteristics was found among distance strata across the shelf regardless of latitude. Fish were always relatively smaller at inner shelf reefs and grew more slowly when compared to mid and outer shelf reefs; this was true regardless of the color morph of fish. The oldest fish collected was 11 years old, and there was no consistent variation in age-max among distances from shore. On outer reefs, there was a negative linear relationship with age-max and latitude. This “tropical gradient” of age only explained 34% of the variation; furthermore, this was not found when only the oldest group of fish was considered (top 10%). Fish only reached an age-max of six years on the southernmost reefs. There was a trend for a smaller Linf with latitude but it was not significant and Linf did not vary predictably with water temperature. The sampling of marine protected areas (MPAs) and fished zones did not confound the resultant patterns in that fish were not consistently larger or older in MPAs or fished zones. Instantaneous mortality rates were 0.245–0.685; they were highest at inner reefs and also showed no consistent MPA-related patterns. Our study suggested that the mid and outer shelf waters of the GBR appeared best suited for growth of A. polyacanthus. In conclusion, the position on continental shelves dominated other geographical patterns and needs to be considered in spatial models of growth. We suggest that local environmental conditions such as turbidity and the quality and quantity of plankton likely have a strong influence on distance across the shelf-based demographic patterns of planktivores.

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Cross-continent comparisons reveal differing environmental drivers of growth of the coral reef fish, Lutjanus bohar

Cited by 13 publications

References 56 publications

Early overcounting in otoliths: a case study of age and growth for gindai (Pristipomoides zonatus) using bomb 14C dating

Early overcounting in otoliths: a case study of age and growth for gindai (Pristipomoides zonatus) using bomb 14C dating

Latitudinal and Cross-Shelf Patterns of Size, Growth and Mortality of a Tropical Damselfish Acanthochromis polyacanthus on the Great Barrier Reef

Latitudinal and Cross-Shelf Patterns of Size, Age, Growth, and Mortality of a Tropical Damselfish Acanthochromis polyacanthus on the Great Barrier Reef

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