Impacts of fishing and environmental factors driving changes on littoral fish assemblages in a subtropical oceanic island

Sangil, Carlos; Martín-García, Laura; Hernández, José Carlos; Concepción, Laura; Fernández, Raúl Gómez; Clemente, Sabrina

doi:10.1016/j.ecss.2013.04.023

Cited by 15 publications

(12 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water temperature was found to play a critical role in the completion of fish life histories, especially the spawning stage (Chang et al, ; Wang et al, ). Nevertheless, previous studies have reported that temperature had less of an effect on fish assemblages than sediment characteristics (Sangil et al, ; Wolter, ), similar to the results of this study (Table ). The fragmentation of habitat of endemic species downstream of the Gezhouba Dam via substrate erosion has also been documented (Tao et al, ).…”

Section: Discussionsupporting

confidence: 92%

“…In the subsequent DistLM analysis, the Akaike information criterion (AIC) and 9999 permutations based on similarity matrices were used to identify the model with optimal fitness of prediction. The Bray–Curtis index was used to determine the Euclidean distances between the relative species abundance and the abiotic variables (Sangil et al, ). During this process, the relative species abundances were log‐transformed to reduce the influence of extreme values, whereas the abiotic variables were normalized to guarantee comparable scales with different measurement scales.…”

Section: Methodsmentioning

confidence: 99%

“…Meanwhile, to avoid the potential negative and positive effects as well as interactions between biotic–abiotic relationships, both marginal and sequential tests were used separately to examine the responses of relative species abundances to the changes of each variable and entire abiotic variables, thereby identifying the significant abiotic variables for the subsequent DistLM analysis. Finally, a distance‐based RDA (dbRDA) was used to visualize the effects of abiotic variables on the temporal changes in fish assemblages (i.e., the clustered groups from the CA analysis) according to the multivariate regression model generated from the DistLM (Anderson et al, ; Sangil et al, ).…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Multivariate analysis performed to identify the temporal responses of fish assemblages to abiotic changes downstream of the Gezhouba Dam on the Yangtze River

Yang

Tao

Qiao

et al. 2018

River Research & Apps

View full text Add to dashboard Cite

Impoundment of the Three Gorges Reservoir (TGR) and overharvesting are anthropogenic factors that have had a dramatic effect on Yangtze fish. This study used the multivariate analysis to quantify the relationship between abiotic alterations (seven variables from the TGR impoundment and fishing activities) and fish response, revealing the processes through which abiotic changes affect fish assemblages over a 14-year period (1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012). Fish assemblages temporally clustered into three groups that were strongly associated with the TGR impoundment. Eleven species that accounted for 98.44% of dissimilarities contributed to these three clustered groups.Variation in fish assemblages primarily resulted from a decline in three lotic species without spawning grounds downstream, fluctuations in four lotic species with spawning grounds downstream, and increases in three eurytopic species. Abiotic changes resulted from the TGR impoundment (TGR water levels, sediment, and water temperature), together with fish activities (fishing intensity), significantly affected the temporal patterns of the fish assemblages. Results suggest that the decline in lotic species can be attributed to the blocking and declines in the downstream movement of lotic species caused by increased water levels in the TGR. Increases in eurytopic species and declines in other species were caused by habitat fragmentation via a decline in sediment discharge and changes in water temperature. Fishing activities affected fish assemblages throughout the entire period of observation, particularly during the initial impoundment period from 2003 to 2005. These findings highlight the degree to which those anthropogenic factors affected the fish assemblages in temporal processing.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Multivariate analysis performed to identify the temporal responses of fish assemblages to abiotic changes downstream of the Gezhouba Dam on the Yangtze River

Yang

Tao

Qiao

et al. 2018

River Research & Apps

View full text Add to dashboard Cite

show abstract

“…The narrow and steep insular platforms, along with low productivity waters, limit the available habitat for demersal fisheries species, and restricts the fishing methods that are suitable for these habitats [ 15 ]. Intensive overfishing of many prized nearshore species has been a concern throughout the region for decades [ 16 – 18 ]. This has not only reduced nearshore fish stocks, but has also had a cascading effect on the entire ecosystem by removing the predators of sea urchins, which have proliferated in the absence of these predators.…”

Section: Introductionmentioning

confidence: 99%

Contrasts in the marine ecosystem of two Macaronesian islands: A comparison between the remote Selvagens Reserve and Madeira Island

et al. 2017

Self Cite

View full text Add to dashboard Cite

The islands of Madeira and Selvagens are less than 300 km apart but offer a clear contrast between a densely populated and highly developed island (Madeira), and a largely uninhabited and remote archipelago (Selvagens) within Macaronesia in the eastern Atlantic. The Madeira Archipelago has ~260,000 inhabitants and receives over six million visitor days annually. The Selvagens Islands Reserve is one of the oldest nature reserves in Portugal and comprises two islands and several islets, including the surrounding shelf to a depth of 200 m. Only reserve rangers and a small unit of the maritime police inhabit these islands. The benthic community around Selvagens was dominated by erect and turf algae, while the community at Madeira was comprised of crustose coralline and turf algae, sessile invertebrates, and sea urchin barrens. The sea urchin Diadema africanum was 65% more abundant at Madeira than at Selvagens. Total fish biomass was 3.2 times larger at Selvagens than at Madeira, and biomass of top predators was more than 10 times larger at Selvagens. Several commercially important species (e.g., groupers, jacks), which have been overfished throughout the region, were more common and of larger size at Selvagens than at Madeira. Important sea urchin predators (e.g., hogfishes, triggerfishes) were also in higher abundance at Selvagens compared to Madeira. The effects of fishing and other anthropogenic influences are evident around Madeira. This is in stark contrast to Selvagens, which harbors healthy benthic communities with diverse algal assemblages and high fish biomass, including an abundance of large commercially important species. The clear differences between these two island groups highlights the importance of expanding and strengthening the protection around Selvagens, which harbors one of the last intact marine ecosystems in the North Atlantic, and the need to increase management and protection around Madeira.

show abstract

“…Once generated, different layers were added to the map, includ- The great depths surrounding the island of Gran Canaria act as an insuperable physical barrier to the adults of the majority of marine species (Sangil et al, 2013). Therefore, it can be considered that stocks of fishes, crustaceans and molluscs that comprise the marine fauna of the island are geographically limited to the waters surrounding it.…”

Section: Ecospace Baseline Maps Habitats and Regionsmentioning

confidence: 99%

Temporal and spatial predictions of effect of alternative fishing policies for the Gran Canaria marine ecosystem

Couce-Montero

Christensen

Sieyro

et al. 2019

Journal of Fish Biology

View full text Add to dashboard Cite

In this paper we consider what may happen to the marine ecosystem of Gran Canaria Island within the 2030 horizon, if fishing strategies different from those currently in place were implemented and we evaluate the effect of, for example, reduction of recreational–artisanal fishing, limitation of catches (e.g. total allowable catches, TAC), or spatial distribution of fishing sectors. From all scenarios tested, only those that significantly reduce the high effort of the recreational fishing would allow the recovery of the most exploited stocks in the marine ecosystem in the short and medium‐term. Moreover, the best management strategy, in contribution to abundance, was obtained with a scenario that has a spatial partition of exploitation rights between artisanal and recreational fishermen and includes no‐fishing zones (NTZ). This work is a first attempt to use spatial and temporal models to assess the effectiveness of alternative fishery policies in the Canary Islands.

show abstract

Impacts of fishing and environmental factors driving changes on littoral fish assemblages in a subtropical oceanic island

Cited by 15 publications

References 48 publications

Multivariate analysis performed to identify the temporal responses of fish assemblages to abiotic changes downstream of the Gezhouba Dam on the Yangtze River

Multivariate analysis performed to identify the temporal responses of fish assemblages to abiotic changes downstream of the Gezhouba Dam on the Yangtze River

Contrasts in the marine ecosystem of two Macaronesian islands: A comparison between the remote Selvagens Reserve and Madeira Island

Temporal and spatial predictions of effect of alternative fishing policies for the Gran Canaria marine ecosystem

Contact Info

Product

Resources

About