Influences of Natural and Anthropogenic Factors and Tidal Restoration on Terrestrial Arthropod Assemblages in West Coast North American Estuarine Wetlands

David, Aaron T.; Goertler, Pascale; Munsch, Stuart H.; Jones, Brittany R.; Simenstad, Charles A.; Toft, Jason D.; Cordell, Jeffery R.; Howe, Emily; Gray, Ayesha; Hannam, Michael; Matsubu, William; Morgan, Erin E.

doi:10.1007/s12237-016-0091-3

Cited by 9 publications

(12 citation statements)

References 61 publications

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“…Diptera, Hemiptera, Amphipoda, and Collembola are all important components of fish diets in other estuaries, particularly for juveniles salmonids [51, 64, 65]. Studies of fish diets from vegetated tidal wetlands in the Delta are scarce, but Sommer et al [50] found that salmon on the nearby Yolo Bypass floodplain derived the majority of their diets from chironomid midges (Diptera), which are plentiful in EAV (Fig 4).…”

Section: Discussionmentioning

confidence: 99%

“…While floating vegetation is not considered good habitat for native fishes, the invertebrates we found in this habitat may be an important resource. Terrestrial invertebrates are often an important component of salmonid diets [65], and Amphipoda and Diptera provide particularly high-energy food for at-risk fishes [51]. The benefits of these fish-food invertebrates may help offset the water quality problems associated with Eichhornia ; however, native species of floating vegetation, such as Hydrocotyle , often have a higher overall diversity of invertebrates and higher proportion of native invertebrates [27].…”

Section: Discussionmentioning

confidence: 99%

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Characterizing macroinvertebrate community composition and abundance in freshwater tidal wetlands of the Sacramento-San Joaquin Delta

Hartman¹,

Sherman²,

Contreras³

et al. 2019

PLoS ONE

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Restored tidal wetlands may provide important food web support for at-risk fish species in the Sacramento-San Joaquin Delta (Delta) of California, including Delta Smelt (Hypomesus transpacificus) and Chinook Salmon (Oncorhynchus tshawytscha). Since many tidal wetland restoration projects are planned or have recently been constructed in the Delta, understanding the diversity and variability of wetland invertebrates that are fish prey items is of increasing importance. During this study, two different invertebrate sampling techniques were tested (leaf packs and sweep nets) in four habitat types within three different wetland areas to evaluate which sampling technique provided the most reliable metric of invertebrate abundance and community composition. Sweep nets provided a better measure of fish food availability than leaf packs and were better able to differentiate between habitat types. Generalized linear models showed submerged and floating vegetation had higher abundance and taxa richness than channel habitats or emergent vegetation. Permutational multivariate analysis of variance showed significantly different communities of invertebrates in different habitat types and in different wetlands, and point-biserial correlation coefficients found a greater number of mobile taxa associated with sweep nets. There were more taxa associated with vegetated habitats than channel habitats, and one area had more taxa associated with it than the other two areas. These results suggest that restoration sites that contain multiple habitat types may enhance fish invertebrate prey diversity and resilience. However, the effect of habitat diversity must be monitored as restoration sites develop to assess actual benefits to at-risk fish species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Characterizing macroinvertebrate community composition and abundance in freshwater tidal wetlands of the Sacramento-San Joaquin Delta

Hartman¹,

Sherman²,

Contreras³

et al. 2019

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…While floating vegetation is not considered good habitat for native fishes, the invertebrates we found in this habitat may be an important resource. Terrestrial invertebrates are often an important component of salmonid diets [58], and Amphipoda and Diptera provide particularly high-energy food for at-risk fishes [59]. The benefits of these fish-food invertebrates may help offset the water quality problems associated with Eichhornia ; however, native species of floating vegetation, such as Hydrocotyle , often have a higher overall diversity of invertebrates and higher proportion of native invertebrates [25].…”

Section: Discussionmentioning

confidence: 99%

“…Amphipoda and Diptera may be particularly important in salmonid diets [51, 58], so SAV may provide a source of fish food, if the fishes can access it. However, recent expansions of Egeria and other invasive SAV in the Delta have been linked to reduced turbidity and increased habitat for non-native piscivores [20–22].…”

Section: Discussionmentioning

confidence: 99%

Characterizing macroinvertebrate community composition and abundance in freshwater tidal wetlands of the Sacramento-San Joaquin Delta

Hartman

Sherman

Contreras

et al. 2019

Preprint

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28Restored tidal wetlands may provide important food web support for at-risk fish species in the 29 Sacramento-San Joaquin Delta (Delta) of California, including Delta Smelt (Hypomesus 30 transpacificus) and Chinook Salmon (Oncorhynchus tshawytscha). Since many tidal wetland 31 restoration projects are planned or have recently been constructed in the Delta, understanding the 32 diversity and variability of wetland invertebrates that are fish prey items is of increasing 33 importance. During this study, two different invertebrate sampling techniques were tested (leaf 34 packs and sweep nets) in four habitat types within three different wetland sites to evaluate which 35 sampling technique provided the most reliable metric of invertebrate abundance and community 36 composition. Sweep nets provided a better measure of fish food availability than leaf packs and 37 were better able to differentiate between habitat types. Generalized linear models showed 38 submerged and floating vegetation had higher abundance and species richness than channel 39 habitats or emergent vegetation. Permutational multivariate analysis of variance showed 40 significantly different communities of invertebrates in different habitat types and in different 41 wetlands, and point-biserial correlation coefficients found a greater number of mobile taxa 42 associated with sweep nets. There were more taxa associated with vegetated habitats than 43 channel habitats, and one region had more taxa associated with it than the other two regions. 44These results suggest that restoration sites that contain multiple habitat types may enhance fish 45 invertebrate prey diversity and resilience. However, the effect of habitat diversity must be 46 monitored as restoration sites develop to assess actual benefits to at-risk fish species. 47 48 3 49Tidal wetlands provide an important source of productivity to many estuaries worldwide, 50 subsidizing the surrounding open-water areas with vascular plant detritus, phytoplankton, 51 zooplankton, and nekton biomass [1][2][3][4][5]. Productive freshwater tidal wetlands dominated the 52 landscape of California's Sacramento-San Joaquin Delta (Delta) prior to the Gold Rush, but, by 53 1930, the vast majority of wetlands were reclaimed, primarily for agriculture [6] (see Fig 1A). 54While there is currently no quantitative estimate of the impact of wetland loss on aquatic primary 55 productivity, production most likely declined drastically post-reclamation [7]. 56 57 Figure 1. A) Map of California (USA) with the San Francisco Bay-Delta watershed. The inset is 58 a finer-scale map of the Legal Delta, with the focal area in the Cache Slough Complex outlined 59 with a dashed box. B) The Cache Slough complex, with sampling regions circled. Each region 60 contained four sampling sites with different habitat types: SAV, FAV, EAV, and channel. 61 62 Restoration of tidal wetland habitat in the Delta may increase overall primary and secondary 63 production, and thus multiple regulatory mandates now include tidal wetland restoratio...

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“…The spatiotemporal patterns of earthworm community were shown to indicate different habitats in the coastal grass of West Africa (Rossi & Lavelle, 2015;Jaikishun et al, 2015). Soil fauna were found to exhibit the natural and anthropogenic effects on the west coast of North American, and the most influential natural factors on the abundance and composition of soil fauna were found to be vegetation conditions (David et al, 2016). However, few studies concentrating on the responses of soil faunal communities to the environmental variations caused by the coastal-inland gradient.…”

Section: Introductionmentioning

confidence: 99%

Soil macro-fauna respond to environmental variations along a coastal-inland gradient

Zheng

Tao

Wang

et al. 2020

PeerJ

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Varied environmental conditions in coastal-inland zones tend to influence soil faunal communities. However, few studies have focused on the responses of soil fauna to environmental variations along the coastal-inland gradient. In order to better understand the aforementioned responses, a total of 80 soil macro-faunal samples were collected at the five different distances from the coastline of China’s Bohai Bay. The results revealed that the compositions, structural characteristics and diversity of the soil macro-fauna varied among the different habitats. With the increases in the distance from the sea, the individual density, richness and diversity levels of the soil macro-fauna all first increased and then decreased. The individual density, richness and diversity values were all at their maximum at 30 km from the sea. The Edge effect promoted unique and rare soil macro-faunal taxa. Formicidae, Curculionidae and Aphodiidae were found to be the edge taxa. Agelenidae, Liocranidae and Nematocera were considered to be indicator taxa of severe sea effects. Paradoxosomatidae was an indicator taxon of slight effects. Overall, the environmental variations along the coastal-inland gradient were found to have the potential to affect the soil macro-faunal communities, and the different taxa of the soil macro-fauna responded to those variations in different ways. This study further revealed the processes and mechanisms of the sea influencing the soil macro-faunal communities, which had been caused by the coastal-inland gradient. The results of this study also provided a theoretical basis for developing future biodiversity guidelines for coastal ecosystems.

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Influences of Natural and Anthropogenic Factors and Tidal Restoration on Terrestrial Arthropod Assemblages in West Coast North American Estuarine Wetlands

Cited by 9 publications

References 61 publications

Characterizing macroinvertebrate community composition and abundance in freshwater tidal wetlands of the Sacramento-San Joaquin Delta

Characterizing macroinvertebrate community composition and abundance in freshwater tidal wetlands of the Sacramento-San Joaquin Delta

Characterizing macroinvertebrate community composition and abundance in freshwater tidal wetlands of the Sacramento-San Joaquin Delta

Soil macro-fauna respond to environmental variations along a coastal-inland gradient

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