Effects of trampling by humans on animals inhabiting coralline algal turf in the rocky intertidal

Brown, Pam J.; Taylor, Richard B.

doi:10.1016/s0022-0981(98)00186-5

Cited by 76 publications

(105 citation statements)

References 17 publications

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“…Algal turf and the fauna associated with it are particularly vulnerable to human trampling, (Addessi, 1994;Brosnan & Crumrine, 1994;Keough & Quinn, 1998;Brown & Taylor, 1999). So as human visitation to the rocky intertidal increases with increasing coastal populations in California (e.g., Roy et al, 2003), the high diversity of turf-associated ostracodes may be substantially affected.…”

Section: Discussionmentioning

confidence: 99%

“…This lack of baseline information complicates efforts to understand how these communities respond to natural and anthropogenic changes in the environment. This concern is particularly acute for intertidal meiofauna because this habitat is easily accessible and increasingly impacted by human activities and many meiofaunal taxa maybe particularly sensitive to such disturbances (Moore & Bett, 1989;Brown & Taylor, 1999;Ruiz et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Intertidal meiofaunal biodiversity with respect to different algal habitats: a test using phytal ostracodes from Southern California

2007

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Rocky intertidal algae harbor a diverse invertebrate meiofauna of arthropods, nematodes and other invertebrates. Despite its ecological importance, relatively little is known about the diversity and composition of this important component of intertidal biodiversity. In this study, we quantified species composition, abundance and distribution of ostracodes, an important group of phytal meiofauna, at two different intertidal areas in southern California. In total, we recovered 22 ostracode species from three different orders (16 podocopids, five myodocopids and one platycopid), nearly a quarter of which could not be assigned to existing taxa. The abundance of ostracodes differed significantly among algal types, with structurally complex algae bearing many more ostracodes per gram of algae than simple forms (blade-like algae and the surfgrass Phyllospadix). Although most ostracode species were recovered from multiple kinds of algae, different algae harbored distinct assemblages that could be discriminated statistically on the basis of relative abundances of ostracode species. This segregation of the ostracode fauna according to algal species is evident even over very short spatial scales (<1 m). Finally, ostracode samples from turf-forming algae were more species rich than samples from other kinds of macroalgae. Since turf-forming algae are easily damaged by human trampling, this component of ostracode biodiversity may be particularly vulnerable to anthropogenic impacts on the intertidal habitat.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intertidal meiofaunal biodiversity with respect to different algal habitats: a test using phytal ostracodes from Southern California

2007

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“…This is because anthropogenic stresses are superimposed on stresses caused by natural environmental factors (Raffaelli & Hawkins, 1996). Strong linkages often exist among species (Paine, 1980) and therefore, rocky shore communities are sensitive to human induced disturbances that may play an important role in the shaping of species diversity through indirect influences on species abundances (Addessi, 1994;Brosnan & Crumrine, 1994;Keough & Quinn, 1998;Brown & Taylor, 1999;Milazzo, et al, 2004). Through the years, humans have substantially affected intertidal zones across the globe and this scenario has been proven by human exclusion experiments in rocky shore communities (Castilla & Duran, 1985;Castilla & Bustamante, 1989;Hockey, 1994), although this approach is difficult to implement in most places.…”

Section: Anthropogenic Disturbancesmentioning

confidence: 99%

Community-level analysis of anthropogenic impacts on rocky shore communities in Sri Lanka

Manage

2008

Nature Precedings

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Statement according to § 6 (8) Final Examination Regulations of the University of Bremen for the Master's Degree "ISATEC" I herewith confirm that I have elaborated my diploma thesis titledCommunity-level analysis of anthropogenic impacts on rocky shore communities in Sri Lanka single-handed and without using other resources than mentioned therein. Page | VI ----------------------------------------------------------------------------------------------------------------------------- Place and Date Signature ABSTRACTHuman activities threat seashore communities in many areas of the world and their impacts on coastal ecosystem are a matter of increasing concern. Present study describes the anthropogenic disturbances on the rocky shore community structure by comparing the benthic communities of disturbed and non-disturbed areas in Sri Lanka where rocky shores remain virtually untouched so far by experimental studies. Impacts of human disturbances; trampling, handling and exploitation on the community structure of rocky macro benthic assemblages were tested in high-, mid-and lowintertidal area by stratified sampling method at Rumassala marine sanctuary and adjacent two localities at either side of the marine sanctuary, Galle and Unawatuna. Univariate measures, log series model and multivariate techniques were used to discriminate the communities with respect to the disturbances. Proximity of study localities and indistinguishable physicochemical parameters of sea surface water (temperature, Salinity, conductivity, dissolved oxygen and pH) indicated that overall environment of the study area was relatively uniform and changes in community structure was due to human disturbances. Human disturbances documented as visitor censuses by transect walk method lead to categorize the Rumassala as non-disturbed, Unawatuna as disturbed with Galle being of moderately disturbance. Community abundance showed a decreasing trend along with increasing disturbances, albeit community biomass, due to opportunistic algae species, increased in parallel to disturbances. Computed Index of disturbance revealed that macrofauna was very sensitive to the disturbances and increased disturbances reduced their competitive pressure on macroalgae, leading to outstanding macroalgal growth. Macroalgal domination in disturbed communities contributed to lessen the heterotrophic dominance in Galle and Unawatuna. 96 macrobenthic taxa were encountered from the study and Species richness, Shannon and Fisher's diversity index showed decreasing trend with increasing disturbances. Moreover, initial rising slope of species accumulation curves for three communities indicated that community evenness was low in disturbed communities. The community compositions from dominant conservative species to fast growing opportunistic species were well described by the log series model, showing left skewed distribution. The SIMPER analysis further confirmed that most biomass dominant species in stress status were the opportunistic species such as Valoniopsis pachynema, Gracilari...

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“…The effects of human trampling on intertidal fauna have been intensively studied, especially in temperate zones (Povey and Keough, 1991;Brosnan and Crumrine, 1994;Fletcher and Frid, 1996;Keough and Quinn, 1998;Schiel and Taylor, 1999). Most studies have observed a reduction in abundance of some taxa, such as polychaetes (Brown and Taylor, 1999), bivalves (Beauchamp and Gowing, 1982) and barnacles (Brosnan and Crumrine, 1994) that may affect population dynamics and diversity of the entire community.…”

Section: Introductionmentioning

confidence: 99%

“…Previous research has mostly focused on large conspicuous organisms, even though smaller cryptic animals also deserve attention due to their great abundance, high productivity and importance as food for higher trophic levels (Brown and Taylor, 1999).…”

Section: Introductionmentioning

confidence: 99%

Effects of human trampling on a rocky shore fauna on the Sao Paulo coast, southeastern Brazil

Ferreira

Rosso

2009

Braz. J. Biol.

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Increased tourist activity in coastal regions demands management strategies to reduce impacts on rocky shores. The highly populated coastal areas in southeastern Brazil are an example of degradation caused by development of industry and tourism. Among different shore impacts, trampling has been intensively studied, and may represent a significant source of stress for intertidal fauna. A randomised blocks design was applied to experimentally study the effects of two different trampling intensities on richness, diversity, density and biomass of the rocky shore fauna of Obuseiro beach, Guarujá, southeastern Brazil. Blocks were distributed in two portions of the intertidal zone, dominated respectively by Chthamalus bisinuatus (Cirripedia) and Isognomon bicolor (Bivalvia). Blocks were trampled over three months, simulating the vacation period in Brazil and were monitored for the following nine months. Results indicate that Chthamalus bisinuatus is vulnerable to trampling impacts. Richness, diversity and turn-over index tended to be higher in trampled plots four months after trampling ceased. In general, results agree with previous trampling studies, suggesting that even low intensities of trampling may cause some impact on intertidal communities. Management strategies should include isolation of sensitive areas, construction of boardwalks, visitor education and monitoring programmes. In Brazil, additional data obtained from experimental studies are necessary in order to achieve a better understanding of trampling impacts on rocky shore communities.Keywords: rocky shore, intertidal community, trampling, tourism impacts.Impactos do pisoteio humano na fauna de um costão rochoso do litoral de São Paulo, no sudeste brasileiro ResumoO aumento da atividade turística em áreas costeiras nas últimas décadas faz necessária a adoção de estratégias de manejo para reduzir os impactos gerados às comunidades de costões rochosos. A região costeira do sudeste brasileiro possui bons exemplos de degradação causada pelo turismo e desenvolvimento industrial. Dentre os diferentes distúr-bios causados pela visitação, o pisoteio têm sido estudado de forma intensa e pode representar uma fonte significativa de impactos para as comunidades da zona entre-marés. Neste projeto, foi aplicado um desenho de blocos randômicos para se avaliar experimentalmente os efeitos de duas intensidades de pisoteio na riqueza, diversidade, densidade, recobrimento e biomassa da fauna de um costão situado na praia do Obuseiro, no município do Guarujá, São Paulo, Brasil.

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Effects of trampling by humans on animals inhabiting coralline algal turf in the rocky intertidal

Cited by 76 publications

References 17 publications

Intertidal meiofaunal biodiversity with respect to different algal habitats: a test using phytal ostracodes from Southern California

Intertidal meiofaunal biodiversity with respect to different algal habitats: a test using phytal ostracodes from Southern California

Community-level analysis of anthropogenic impacts on rocky shore communities in Sri Lanka

Effects of human trampling on a rocky shore fauna on the Sao Paulo coast, southeastern Brazil

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