Bioenergetic and landscape considerations for scaling expectations of nekton production from intertidal marshes

Kneib, R. T.

doi:10.3354/meps264279

Cited by 79 publications

(65 citation statements)

References 84 publications

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“…This suggests that much of this species' scope for growth is unrealized, and growth of mummichogs may be resource limited even in the productive tidal marsh environment. Weisberg & Lotrich (1982) used field experiments to show that intertidal resources were an important energy source for mummichog populations, suggesting that access to the intertidal marsh was important.Early observations on Sapelo Island relating the complexity of tidal drainage networks to marsh elevation and distance to open water (Ragotzkie 1959) were confirmed by previously published measurements of elevation above mean low water at the present study sites (Kneib 2003): D simple (+ 221 to + 225 cm), O complex (+194 to +197 cm), and D complex (+155 to +189 cm). In the present study, growth was greater at the site highest in elevation (D simple ), which should have provided less access to intertidal marsh resources than either of the more frequently flooded sites.…”

supporting

confidence: 68%

“…Because there were no true replicates of any level of landscape complexity (i.e. groups of multiple sites with the same levels of landscape complexity), the field observations from this study cannot be extended with any statistical reliability beyond the sites examined here.Given that standing stock biomass of mummichogs and other tidal marsh nekton on Sapelo Island tend to be greater at sites with more complex channel networks (Kneib 2003), the present results show that landscape-related variation in production is not driven by differences in mean individual growth rates, but perhaps by differences in relative abundance (i.e. complex intertidal drainage networks support more individuals); a similar observation of a positive relationship between intertidal channel complexity and abundance also has been reported for juvenile penaeid shrimp in Georgia estuaries (Webb & Kneib 2002).…”

mentioning

confidence: 99%

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Genotypic variation does not explain differences in growth of mummichogs Fundulus heteroclitus from simple and complex tidal marsh landscapes

Kneib¹

2009

Mar. Ecol. Prog. Ser.

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Decimal coded wire tags were used to measure individual growth rates of mummichogs (Pisces: Fundulidae) within tidal marshes on Sapelo Island, Georgia, USA. Mummichogs (n = 17 508) were marked and released at 3 sites with different levels of complexity in their tidal channel drainage networks. The proportion of recaptures (average 19%), which varied from 6.4 to 43.3% among sites and release dates, was inversely related to relative complexity of the tidal drainage networks. Gender-specific differences were detected in size metrics and growth rates. Mean (± SD) growth rates (mm d -1 total length, TL) of individuals at large for 28 to 56 d prior to recapture ranged from 0.062 ± 0.044 to 0.274 ± 0.060 for males and 0.071 ± 0.036 to 0.279 ± 0.062 for females, with the least and most rapid growth rates associated with complex and simple tidal drainage networks, respectively. A 'common garden' experiment was conducted to test the hypothesis that there were genotypic differences in growth potential seemingly associated with landscape structure. Two size classes (40-50 and 55-65 mm TL) of individually marked mummichogs from drainage networks characterized as simple (high growth) and complex (low growth) were raised in the laboratory for 42 d on each of 2 daily rations (10 and 30% wet body mass) of minced fresh-frozen grass shrimp. There was no significant difference in mean (± SD) daily growth rates of mummichogs from the 2 sites (simple: 0.283 ± 0.124 and complex: 0.299 ± 0.131) when reared under the same conditions. Although there was no evidence of a genotypic difference in growth potential between these local populations of mummichogs, a possible association between landscape structure and gene expression reflected in the spatial variation of fish growth within tidal marsh ecosystems remains to be explored. KEY WORDS: Coded wire tags · Estuary · Genome · Fundulus heteroclitus · Killifish · Mummichog · WetlandsResale or republication not permitted without written consent of the publisher Mar Ecol Prog Ser 386: 207-219, 2009 with spawning areas, as a likely mechanism producing genetic and phenotypic population sub-structuring from limited gene flow among locations even in the absence of effective physical barriers to movement.The research reported in this paper begins to explore the issue of whether spatial variation at a landscape scale is reflected in biotic variation at the molecular level (i.e. genetic variation or variation in gene expression) within estuarine organisms. In this study, spatial variation in the complexity of tidal marsh channel networks was used as a metric of estuarine landscape structure, and individual growth rates within populations of the mummichog Fundulus heteroclitus was a metric of phenotypic variation that could reflect spatial variation in the genome.Populations of Fundulus heteroclitus are resident year-round in marshes along most of the Atlantic coast of North America, where 2 sub-species seem to divide the range (F. h. macrolepidotus northward of Chesapeake Bay, and F. h....

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confidence: 68%

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confidence: 99%

Genotypic variation does not explain differences in growth of mummichogs Fundulus heteroclitus from simple and complex tidal marsh landscapes

Kneib¹

2009

Mar. Ecol. Prog. Ser.

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“…However, most of these studies were conducted in the northern Gulf of Mexico. On the US Atlantic coast, Kneib (2003) demonstrated a positive relationship between nekton production and edge density within a 200 m radius of sampling locations on the interior intertidal marsh plain. Webb & Kneib (2002) also identified a relationship between the amount of intertidal marsh edge and the abundance of white shrimp Litopenaeus setiferus in adjacent subtidal channels of Georgia (USA) salt marshes.…”

Section: Edge Effectsmentioning

confidence: 99%

“…However, sigmoid relationships between nekton produc-tion and salt marsh landscape pattern have been demonstrated. For example, Kneib (2003) described steep declines in both resident and migrant nekton production when the amount of marsh edge within a 200 m radius of a sampling point dropped below a 3000 m threshold. However, duration of tidal inundation, i.e.…”

Section: Non-linearities In Animal-habitat Configuration Relationshipsmentioning

confidence: 99%

Seascape ecology of coastal biogenic habitats: advances, gaps, and challenges

Boström¹,

Pittman²,

Simenstad³

et al. 2011

Mar. Ecol. Prog. Ser.

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370

301

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We review the progress made in the emerging field of coastal seascape ecology, i.e. the application of landscape ecology concepts and techniques to the coastal marine environment. Since the early 1990s, the landscape ecology approach has been applied in several coastal subtidal and intertidal biogenic habitats across a range of spatial scales. Emerging evidence indicates that animals in these seascapes respond to the structure of patches and patch mosaics in different ways and at different spatial scales, yet we still know very little about the ecological significance of these relationships and the consequences of change in seascape patterning for ecosystem functioning and overall biodiversity. Ecological interactions that occur within patches and among different types of patches (or seascapes) are likely to be critically important in maintaining primary and secondary production, trophic transfer, biodiversity, coastal protection, and supporting a wealth of ecosystem goods and services. We review faunal responses to patch and seascape structure, including effects of fragmentation on 5 focal habitats: seagrass meadows, salt marshes, coral reefs, mangrove forests, and oyster reefs. Extrapolating and generalizing spatial relationships between ecological patterns and processes across scales remains a significant challenge, and we show that there are major gaps in our understanding of these relationships. Filling these gaps will be crucial for managing and responding to an inevitably changing coastal environment. We show that critical ecological thresholds exist in the structural patterning of biogenic ecosystems that, when exceeded, cause abrupt shifts in the distribution and abundance of organisms. A better understanding of faunal-seascape relationships, including the identifications of threshold effects, is urgently needed to support the development of more effective and holistic management actions in restoration, site prioritization, and forecasting the impacts of environmental change.

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“…Powers et al (2003) present an analogous synthesis and quantitative model to establish how installation of an offshore artificial reef is expected to affect fish production in the southeast USA. Kneib (2003) combines a bioenergetic approach with a landscape perspective to develop realistic expectations for augmentation of nekton associated with restoration of salt marsh habitat. Finally, Peterson & Lipcius (2003) use the preceding papers in the Theme Section to suggest how the discipline of restoration ecology has been and can further be advanced to better predict (e.g.…”

mentioning

confidence: 99%

Scaling restoration actions in the marine environment to meet quantitative targets of enhanced ecosystem services

Peterson

Kneib²,

Manen³

2003

Mar. Ecol. Prog. Ser.

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Bioenergetic and landscape considerations for scaling expectations of nekton production from intertidal marshes

Cited by 79 publications

References 84 publications

Genotypic variation does not explain differences in growth of mummichogs Fundulus heteroclitus from simple and complex tidal marsh landscapes

Genotypic variation does not explain differences in growth of mummichogs Fundulus heteroclitus from simple and complex tidal marsh landscapes

Seascape ecology of coastal biogenic habitats: advances, gaps, and challenges

Scaling restoration actions in the marine environment to meet quantitative targets of enhanced ecosystem services

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