Intertidal invertebrate harvesting: a meta-analysis of impacts and recovery in an important waterbird prey resource

Clarke, Leo J.; Hughes, Kathryn M.; Esteves, Luciana S.; Herbert, Roger J.H.; Stillman, Richard A.

doi:10.3354/meps12349

Cited by 16 publications

(8 citation statements)

References 65 publications

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“…This differentiation in predictability may also require different management strategies to enable recovery in disturbed ecosystems. Several additional analyses have quantified the responses to a certain type of disturbance (Cameron et al ; Clarke et al ) or for a certain ecosystem (Winfree et al ; Holden & Treseder ).…”

Section: Introductionmentioning

confidence: 99%

Meta‐analysis on pulse disturbances reveals differences in functional and compositional recovery across ecosystems

2020

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Most ecosystems are affected by anthropogenic or natural pulse disturbances, which alter the community composition and functioning for a limited period of time. Whether and how quickly communities recover from such pulses is central to our understanding of biodiversity dynamics and ecosystem organisation, but also to nature conservation and management. Here, we present a meta-analysis of 508 (semi-)natural field experiments globally distributed across marine, terrestrial and freshwater ecosystems. We found recovery to be significant yet incomplete. At the end of the experiments, disturbed treatments resembled controls again when considering abundance (94%), biomass (82%), and univariate diversity measures (88%). Most disturbed treatments did not further depart from control after the pulse, indicating that few studies showed novel trajectories induced by the pulse. Only multivariate community composition on average showed little recovery: disturbed species composition remained dissimilar to the control throughout most experiments. Still, when experiments revealed a higher compositional stability, they tended to also show higher functional stability. Recovery was more complete when systems had high resistance, whereas resilience and resistance were negatively correlated. The overall results were highly consistent across studies, but significant differences between ecosystems and organism groups appeared. Future research on disturbances should aim to understand these differences, but also fill obvious gaps in the empirical assessments for regions (especially the tropics), ecosystems and organisms. In summary, we provide general evidence that (semi-)natural communities can recover from pulse disturbances, but compositional aspects are more vulnerable to long-lasting effects of pulse disturbance than the emergent functions associated to them.

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Section: Introductionmentioning

confidence: 99%

Meta‐analysis on pulse disturbances reveals differences in functional and compositional recovery across ecosystems

2020

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“…Recovery of benthic invertebrate assemblages from dredging disturbances varies according to local environmental conditions, gear type, and substrate (Ferns et al, ; Hall & Harding, ) and the feeding quality of cleared areas is likely to change over time. Following mechanical dredging on intertidal mudflats, a significant recovery of non‐target species abundance is highly variable and could be up to 500 days, and a significant recovery of species biomass could exceed this time period (Clarke et al, ). After 6 months, the higher benthic macroinvertebrate biomass measured in the cleared area in comparison with the undisturbed mudflats could suggest that the removal of the oysters did not significantly disturb the benthos that had become established beneath.…”

Section: Discussionmentioning

confidence: 99%

“…Although there have been attempts to remove wild Pacific oysters from rocky habitats where density has been low (Guy & Roberts, 2010;Herbert et al, 2016;McKnight & Chudleigh, 2015), mechanical dredging of oysters would appear to be the only practical solution to reef removal on soft-sediment habitats. However, mobile gears can cause significant disturbance to intertidal benthic habitats and both target and non-target species (Clarke, Hughes, Herbert, Esteves, & Stillman, 2017;Ferns, Rostron, & Sima, 2000;Piersma et al, 2001;Spencer, Kaiser, & Edwards, 1998). In the Wadden Sea, where wild settlement is extensive, total eradication of Pacific oysters through dredging has not occurred owing to concerns that it would harm the ecosystem (Reise, Wegener, Sea, & List, 2010).…”

Section: Introductionmentioning

confidence: 99%

The importance of nonnative Pacific oyster reefs as supplementary feeding areas for coastal birds on estuary mudflats

Herbert

Davies

Bowgen

et al. 2018

Aquatic Conservation

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A combined empirical and modelling approach was used to investigate the value of a Pacific oyster reef to feeding shorebirds and to observe and predict the impact of reef clearance on bird populations in the Colne Estuary, a protected area in south‐east England. Macro‐invertebrate biomass and numbers of feeding birds were measured on a Pacific oyster reef, an adjacent uncolonized mudflat, and an area of mudflat that had been cleared of oysters 6 months previously. These data were used to parameterize an individual‐based model (MORPH) to predict the impact of clearance of the reef on winter bird survival. Feeding success and intake rates of Eurasian oystercatcher, Eurasian curlew, and Eurasian common redshank were also recorded during the course of a winter. The macro‐invertebrate diversity and biomass within both the oyster reef and the cleared area were significantly greater than the adjacent uncolonized mudflat. The density and biomass of large invertebrate prey in the mudflat were low, yet the Pacific oyster reef had much higher densities and biomass of large prey, especially annelids and shore crabs. The winter assemblage of feeding birds differed significantly between each of the areas. The mean total number of feeding birds was significantly greater on the uncolonized mudflat; however, mean peak counts, feeding success rate and prey intake rate of Eurasian oystercatcher were greater on the reef. Significantly greater intake rates and feeding success rates were also observed on the reef for Eurasian curlew, a species of conservation concern. Field data and model predictions show that Pacific oyster reefs can provide valuable supplementary feeding areas for some shorebirds, yet other species avoided the reef. However, as estuaries vary in available feeding resources, it is important that the value of reefs and their management is determined regionally.

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“…Parameter yang dibandingkan adalah nilai rata-rata panjang karapas dan standar deviasi dari masingmasing penelitian (Curtin et al 2002). Perbandingan dilakukan dengan menggunakan nilai standard mean difference (Dick et al 2017;Clarke et al 2017) yang diolah menggunakan perangkat lunak Review Manger 5.3 (academic version). Varian antar penelitian (Vwithin) diperoleh dengan membandingkan jumlah standar deviasi penelitian tahun ke-i (S1) dengan standar deviasi penelitian tahun eksisting (S2) terhadap jumlah sampel tahun ke-i (n1) dan jumlah sampel tahun eksisting (n2).…”

Section: Metodeunclassified

“…Nilai standard mean differrence (d) diperoleh dengan membandingkan selisih rata-rata lebar karapas hasil penelitian tahun ke-i (X1) dan lebar karapas hasil penelitian tahun eksisting (X2) terhadap nilai variana antar penelitian (Vwithin). Formula perhitungannya adalah sebagai berikut (Clarke et al 2017).…”

Section: Metodeunclassified

META ANALISIS PENGARUH TEKANAN PENANGKAPAN TERHADAP UKURAN RAJUNGAN (Portunus pelagicus) DI TELUK BANTEN

et al. 2019

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Blue swimming crab (Portunus pelagicus) is an important economical fishery commodity for fishermen in Banten Bay that are caught using gill nets and collapsible traps. The increasing of fishing pressure has highly potential to reduce the quality of the catch as exposed in previous studies. However, the comprehensive, and time series analysis of the previous research results have not been conducted. The purpose of this study is to analyze the variations of blue swimming crab caught in Banten Bay through a combination of meta-analysis techniques, fishing trials and field obser-vations to determine the effect of fishing activities on swimming crab sizes, and evaluate the status of swimming crab fisheries in Banten Bay. Standard mean difference from 10 different studies was used as a meta-analysis parameter. The results of the meta-analysis showed that fishing activities were conducted from 2004 to 2018 had a significant effect on the decreasing of the swimming crab size. The average of swimming crab carapace width caught in 2019 approximately 121.66 mm. The proportion of legal swimming crabs in 2014, 2015 and 2019 was more than 80%, so that the status of swimming crab fisheries in Banten Bay is still environmentally friendly.Keywords: carapace width, meta analysis, fisheries, Portunus pelagicus, blue swimming crab

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Intertidal invertebrate harvesting: a meta-analysis of impacts and recovery in an important waterbird prey resource

Cited by 16 publications

References 65 publications

Meta‐analysis on pulse disturbances reveals differences in functional and compositional recovery across ecosystems

Meta‐analysis on pulse disturbances reveals differences in functional and compositional recovery across ecosystems

The importance of nonnative Pacific oyster reefs as supplementary feeding areas for coastal birds on estuary mudflats

META ANALISIS PENGARUH TEKANAN PENANGKAPAN TERHADAP UKURAN RAJUNGAN (Portunus pelagicus) DI TELUK BANTEN

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