Growth rates of interface-feeding polychaetes: combined effects of flow speed and suspended food concentration

Hentschel, Brian T.; Larson, Amy A.

doi:10.3354/meps293119

Cited by 26 publications

(25 citation statements)

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“…For example, both facultative feeding and changes in species interactions are known to be associated with changes in flow in both marine and freshwater systems Hentschel and Larson 2005). This contextdependency of performance or interaction strength can influence ecosystem-level processes such as production and resource utilization (Cardinale et al 2001;Stachowicz et al 2007).…”

Section: Scale and Context Dependency Of Ecological Responsementioning

confidence: 99%

Reforming Watershed Restoration: Science in Need of Application and Applications in Need of Science

Palmer

2008

Estuaries and Coasts

196

159

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Coastal and inland waters are continuing to decline in many parts of the world despite major efforts made to restore them. This is due in part to the inadequate role that ecological science has played in shaping restoration efforts. A significant amount of fundamental ecological knowledge dealing with issues such as system dynamics, state changes, context-dependency of ecological response, and diversity is both under-used by managers and practitioners and under-developed by ecologists for use in realworld applications. Some of the science that is being 'used' has not been adequately tested. Thus, restoration ecology as a science and ecological restoration as a practice are in need of reform. I identify five ways in which our ecological knowledge should be influencing restoration to a far greater extent than at present including a need to: shift the focus to restoration of process and identification of the limiting factors instead of structures and single species, add ecological insurance to all projects, identify a probabilistic range of possible outcomes instead of a reference condition, expand the spatial scale of efforts, and apply hierarchical approaches to prioritization. Prominent examples of restoration methods or approaches that are commonly used despite little evidence to support their efficacy are highlighted such as the use of only structural enhancements to restore biodiversity. There are also major gaps in scientific knowledge that are of immediate need to policy makers, managers, and restoration practitioners including: predictive frameworks to guide the restoration of ecological processes, identification of social-ecological feedbacks that constrain ecosystem recovery and data to support decisions of where and how to implement restoration projects to achieve the largest gains. I encourage ecologists to respond to the demand for their scientific input so that restoration can shift from an engineering-driven process to a more sustainable enterprise that fully integrates ecological processes and social science methods.

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Section: Scale and Context Dependency Of Ecological Responsementioning

confidence: 99%

Reforming Watershed Restoration: Science in Need of Application and Applications in Need of Science

Palmer

2008

Estuaries and Coasts

196

159

View full text Add to dashboard Cite

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“…After staining, worms were anesthetized in 5% MgCl and photographed individually with a Sony camcorder (model HDR-HC7) connected to a Leica MZ 12.5 stereomicroscope and a Macintosh computer with iMovie software. Using ImageJ software, we measured the body length of each individual and its width at five locations to calculate its body volume as the sum of four conical frustums (Hentschel andLarson 2005, 2006). The volume of each frustum is calculated as…”

Section: Methodsmentioning

confidence: 99%

“…where V f and V i are measurements of each individual's final and initial body volume, respectively (Hentschel andLarson 2005, 2006). Precipitation, salinity, and other environmental data were acquired from data loggers operated by the National Oceanic and Atmospheric Administration (2004) National Estuarine Research Reserve Network.…”

Section: Methodsmentioning

confidence: 99%

“…Although individual spionids are not labeled as easily as infaunal bivalves (e.g., by applying coded paint dots to their shells: Peterson and Black 1987), Polydora cornuta and most other infaunal spionids reside in sediment tubes that are amenable to transplantation experiments. Spionids are common members of many soft-sediment communities, often having densities over 10,000 m 22 (Zajac 1991;Hentschel and Larson 2006). Their tube-building, feeding, and bioturbation activities alter the sediment and affect other members of the community (Thrush et al 1996;Bolam and Fernandes 2003).…”

mentioning

confidence: 99%

“…Along with other opportunistic spionid species, the abundance of P. cornuta in estuaries has been used as an indicator of habitat quality (Dix et al 2005). Most spionids are interface feeders that switch between deposit feeding and suspension feeding in response to flow and the flux of suspended food particles, and laboratory flume experiments have revealed that the growth rates of juvenile P. cornuta are greatly enhanced when fluxes of suspended food favor suspension feeding (Hentschel andLarson 2005, 2006).…”

mentioning

confidence: 99%

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Seasonal variability in the juvenile growth rate of an infaunal polychaete is related to major rain events

Colvin

Hentschel

2011

Limnology & Oceanography

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We measured juvenile growth rates of the spionid polychaete Polydora cornuta in situ by transplanting and recovering small vials containing labeled individuals and measuring each worm's body volume before and after week-long transplantations into field sediments. To measure seasonal variation of in situ growth rates, we performed 15 intertidal transplantations between November 2008 and January 2010 in Oneonta Slough within the Tijuana River National Estuarine Research Reserve. Our study period included four major rain events with precipitation greater than 2 cm d 21 that reduced salinity in the tidal channel below 20%. On average, we recovered one third of the 72 juveniles that were deployed during each transplantation. Mean relative growth rates ranged from 0% to 15% d 21 among the 15 transplantations and were positively correlated with the mean salinity during each transplantation period. Mean relative growth rates during or a few days after major rain events averaged 2% d 21 , whereas relative growth rates during all other weeks exceeded 7% d 21 . During the NovemberMarch rainy season, mean relative growth rates exceeded 8% d 21 when rain did not occur during a transplantation or during the preceding 7 d, indicating that environmental conditions favoring rapid growth of P. cornuta juveniles returned approximately 1 week after a major rain event. Although the small size of P. cornuta juveniles imposes methodological challenges, their rapid growth and our transplantation methods provide a way to assess environmental quality from the perspective of infaunal performance on small temporal and spatial scales.

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Hydrodynamic mediation of killifish predation on infaunal polychaetes

Hentschel

Hayman

Anderson

2017

Limnology & Oceanography

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To explore predator‐prey interactions between California killifish (Fundulus parvipinnis) and spionid polychaetes (Polydora cornuta and Streblospio benedicti) in saltmarsh creeks, we conducted a laboratory flume experiment to quantify whether killifish prey‐patch selectivity varies with water flow. The flume included a 300‐cm2 area of defaunated sediment within which we centrally positioned 24 P. cornuta, 24 S. benedicti, or no worms as a control. We videotaped groups of three killifish for 50 min at one of six unidirectional flow speeds (3 cm s−1, 6 cm s−1, 9 cm s−1, 12 cm s−1, 15 cm s−1, or 18 cm s−1) and recorded their bite rate anywhere in the sediment vs. bites directed at the central patch containing worms (98 cm2). The number of bites anywhere in the 300‐cm2 sediment area increased as flow increased from 3 cm s−1 to 6 cm s−1 and declined linearly as flow increased further. The number of bites anywhere was lower in treatments with no worms than when either worm species was present. The percentage of bites directed at the central patch varied significantly with flow speed and worm presence. With defaunated sediment only, ∼ 33% of bites were directed at the central patch at all flows, consistent with a null model of nonselective foraging. When either worm species inhabited the central patch, ∼ 65% of bites were directed at the central patch at 3 cm s−1 and 6 cm s−1, with patch selection declining as flow increased. Despite differences in morphology and behavior, the two prey species elicited similar foraging activity by killifish. These results suggest the importance of hydrodynamics in driving these epibenthic predator‐prey interactions.

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Growth rates of interface-feeding polychaetes: combined effects of flow speed and suspended food concentration

Cited by 26 publications

References 54 publications

Reforming Watershed Restoration: Science in Need of Application and Applications in Need of Science

Reforming Watershed Restoration: Science in Need of Application and Applications in Need of Science

Seasonal variability in the juvenile growth rate of an infaunal polychaete is related to major rain events

Hydrodynamic mediation of killifish predation on infaunal polychaetes

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