The Role of Estuarine Hydrodynamics in the Distribution of Kelp Forests in Kachemak Bay, Alaska**

Schoch, G. Carl; Chenelot, Heloise

doi:10.2112/si45-179.1

Cited by 14 publications

(15 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Temporal and spatial distributions of Nereocystis and Eualaria have changed over the years, such as in Kachemak Bay, Alaska (Lees 1976, Schoch 2001, Schoch and Chenelot 2004, and this variablility can have effects on abundance and diversity of kelp-associated communities (Dayton 1985). It was hypothesized here that the spores of these kelp species would exhibit species-specific responses to various sedimentation rates, with Eualaria exhibiting a stronger negative response to increases in sedimentation.…”

Section: Discussionmentioning

confidence: 98%

“…Kachemak Bay is an estuarine fjord under strong influence of glacial sediment discharge (VanLooy et al 2006, Spurkland andIken 2011). This high sedimentation may be a variable that prevents one or both canopy-forming species from settling and establishing in areas of high sedimentation (Schoch and Chenelot 2004), an effect that may increase with increasing glacial discharge.…”

Section: Sorus Collection and Spore Releasementioning

confidence: 99%

See 1 more Smart Citation

Susceptibility of Nereocystis luetkeana (Laminariales, Ochrophyta) and Eualaria fistulosa (Laminariales, Ochrophyta) spores to sedimentation

Deiman¹,

Iken²,

Konar³

2012

ALGAE

View full text Add to dashboard Cite

The establishment of algal spores plays an essential role in adult kelp distribution and abundance patterns. Sedimentation is a key variable regulating algal spore settlement and success, possibly controlling species-specific dominance in situ. Laboratory experiments were used to determine spore attachment and survival rates of two Alaskan canopy-forming kelps, Nereocystis luetkeana (K. Mertens) Postels & Ruprecht and Eualaria fistulosa (Postels & Ruprecht) M. J. Wynne, to various types of sediment loading. Spore attachment for both species was significantly and similarly affected by three sediment treatments: suspended particles; settled sediment covering the substratum; and smothering of attached spores by settling sediment. Spore attachment decreased by approximately 90% at 420 mg sediment L -1, the highest sediment load tested here, under all three treatments for both species. These results suggest that increases in sedimentation may constrain the success of the spore stages, but sediment does not seem to be a likely factor explaining species-specific distribution patterns. However, while sedimentation affected spores of both species similarly, timing of spore release in relation to times of maximum sediment load in the water might differ for different species, possibly explaining kelp species distribution patterns.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Sorus Collection and Spore Releasementioning

confidence: 99%

Susceptibility of Nereocystis luetkeana (Laminariales, Ochrophyta) and Eualaria fistulosa (Laminariales, Ochrophyta) spores to sedimentation

Deiman¹,

Iken²,

Konar³

2012

ALGAE

View full text Add to dashboard Cite

show abstract

“…Where mean density‐driven flow is westward (along the northern shore), the onset of westward tidal flow (flood tide) occurs earlier and has longer duration than the onset and duration of eastward tidal flow. This results in a net westward excursion as shown by Lagrangian drifter experiments [ Schoch and Chenelot , 2004]. It can be inferred from the asymmetry of the tidal flow that, over the fortnightly tidal cycle, tidal current velocities will be stronger during the spring tide and weaker during the neap tide.…”

Section: Settingmentioning

confidence: 97%

“…Furthermore, it can be inferred from the seasonal cycle of freshwater inputs to Cook Inlet (high inputs in summer and low inputs in winter) that density‐driven currents will be weaker during winter than in summer. The general circulation pattern and drifter data are shown in Figure 3 and described by Schoch and Chenelot [2004].…”

Section: Settingmentioning

confidence: 99%

Intertidal sand body migration along a megatidal coast, Kachemak Bay, Alaska

et al. 2007

Self Cite

View full text Add to dashboard Cite

[1] Using a digital video-based Argus Beach Monitoring System (ABMS) on the north shore of Kachemak Bay in south central Alaska, we document the timing and magnitude of alongshore migration of intertidal sand bed forms over a cobble substrate during a 22-month observation period. Two separate sediment packages (sand bodies) of 1-2 m amplitude and $200 m wavelength, consisting of well-sorted sand, were observed to travel along shore at annually averaged rates of 278 m/yr (0.76 m/d) and 250 m/yr (0.68 m/d), respectively. Strong seasonality in migration rates was shown by the contrast of rapid winter and slow summer transport. Though set in a megatidal environment, data indicate that sand body migration is driven by eastward propagating wind waves as opposed to net westward directed tidal currents. Greatest weekly averaged rates of movement, exceeding 6 m/d, coincided with wave heights exceeding 2 m suggesting a correlation of wave height and sand body migration. Because Kachemak Bay is partially enclosed, waves responsible for sediment entrainment and transport are locally generated by winds that blow across lower Cook Inlet from the southwest, the direction of greatest fetch. Our estimates of sand body migration translate to a littoral transport rate between 4,400-6,300 m 3 /yr. Assuming an enclosed littoral cell, minimal riverine sediment contributions, and a sea cliff sedimentary fraction of 0.05, we estimate long-term local sea cliff retreat rates of 9-14 cm/yr. Applying a numerical model of wave energy dissipation to the temporally variable beach morphology suggests that sand bodies are responsible for enhancing wave energy dissipation by $13% offering protection from sea cliff retreat.

show abstract

“…Chlorophyll concentrations are not always predictors of benthic mussel and barnacle growth (Phillips 2005(Phillips , 2007Blanchette et al 2006) and support the possibility of alternative hypotheses. Terrestrial and macroalgae sources of carbon may supplement or displace phytoplankton production (Foley 2009;Tallis 2009) and drive interannual differences in nearshore fish growth (Schoch and Chenelot 2004;Miller et al 2011). Indeed, carbon stable isotope values from kelp greenling muscle tissue indicate high (>50 %) proportions of kelpderived carbon (von Biela et al submitted).…”

Section: Upwelling and Chlorophyllmentioning

confidence: 99%

Evidence of bottom-up limitations in nearshore marine systems based on otolith proxies of fish growth

et al. 2015

View full text Add to dashboard Cite

The Role of Estuarine Hydrodynamics in the Distribution of Kelp Forests in Kachemak Bay, Alaska**

Cited by 14 publications

References 40 publications

Susceptibility of Nereocystis luetkeana (Laminariales, Ochrophyta) and Eualaria fistulosa (Laminariales, Ochrophyta) spores to sedimentation

Susceptibility of Nereocystis luetkeana (Laminariales, Ochrophyta) and Eualaria fistulosa (Laminariales, Ochrophyta) spores to sedimentation

Intertidal sand body migration along a megatidal coast, Kachemak Bay, Alaska

Evidence of bottom-up limitations in nearshore marine systems based on otolith proxies of fish growth

Contact Info

Product

Resources

About