Responses of common SE Australian herbivores to three suspected invasive Caulerpa spp.

Davis, Andrew R.; Benkendorff, Kirsten; Ward, David William

doi:10.1007/s00227-004-1499-z

Cited by 53 publications

(42 citation statements)

References 53 publications

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“…Our results are similar to those found on other invasive seaweeds where amphipods and other herbivores and omnivores fed very little on the invasive species, and therefore the spread of introduced seaweeds is not under herbivore control (Trowbridge, 1995;Levin et al, 2002;Britton-Simmons, 2004;Chavanich & Harris, 2004;Conklin & Smith, 2005;Davis et al, 2005;Sumi & Scheibling, 2005;Gollan & Wright, 2006;Box et al, 2009). 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 caulerpa racemosa---feeding habits---amphipodsLow herbivore diversity and abundance, combined with very little feeding on and weak habitat preference for invasive algae result in limited grazing pressure, as has been reported for the amphipod Cymadusa setosa on C. taxifolia (Gollan & Wright, 2006).…”

Section: Discussionsupporting

confidence: 87%

Does the invasion ofCaulerpa racemosavar.cylindraceaaffect the feeding habits of amphipods (Crustacea: Amphipoda)?

2012

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Ecological interactions involving introduced seaweeds constitute an important research gap, since they could alter the trophic dynamics of native populations, but indirect effects on trophic levels are poorly known. The seaweedCaulerpa racemosais one of the most notable invaders in the Mediterranean Sea. It is well known thatC. racemosamodifies the amphipod community with respect to native habitats, but nothing is known regarding the common use of the same trophic resources. Therefore, the aim of this study was to assess if the feeding habits of amphipods associated with algal habitats are affected by the spread of the invasiveC. racemosa, through stomach content analysis of amphipods living in both native and invaded seaweed assemblages. A total of 240 specimens of 14 species of amphipods were examined. Ten species were present in both studied habitats (native and invaded), while two were exclusive to native and invaded habitats, respectively. Ten individuals of each species at each habitat were selected and their gut contents were examined. A total of 11 different items was found in the gut contents: detritus; vegetal detritus; algae; animal tissue; Oligochaeta; Polychaeta; Foraminifera; Crustacea; Sipuncula; diatoms; and non-identified items. The expansion ofC. racemosainto the native algal community changes the feeding habits of herbivorous amphipods, since their preferred food (epiphytic algae) is not available in the new habitat produced byC. racemosa. This community change occurs because of the presence of caulerpenyne inC. racemosa, which retards the growth of epiphytic algae. Nevertheless, other species are not affected or benefited by the invasion, such as detritivorous species whose main food source and habitat remains available. Altogether, slight changes in the trophodynamism of amphipod assemblages have been detected, which are not seen as relevant in an initial stage. However, they might be promoting some indirect effects in the energetic budget of populations, which may affect the life history. Further studies on food-web interactions in the ecosystems affected by invasive species are necessary.

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Section: Discussionsupporting

confidence: 87%

Does the invasion ofCaulerpa racemosavar.cylindraceaaffect the feeding habits of amphipods (Crustacea: Amphipoda)?

2012

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“…It has been hypothesized that the chemical defenses of C. taxifolia may have facilitated its biological invasion into Mediterranean waters, where it reduces biodiversity, thus negatively affecting the benthic community structure in areas where it occurs (Francour et al, 1995;Bellan-Santini et al, 1996). Davis et al (2005) reached similar conclusions for invasive Caulerpa spp. in Southeastern Australia, because fish and invertebrate herbivores largely avoided these algae and their extracts in feeding trials.…”

Section: Caulerpenynesupporting

confidence: 69%

Chemical Defenses: From Compounds to Communities

Paul

Arthur

Ritson‐Williams

et al. 2007

The Biological Bulletin

177

152

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“…Similarly, with the potential for C. taxifolia to contribute much of the primary production in an invaded ecosystem, the role of these different sources of production in C. taxifolia communities (C. taxifolia foliage, BMA, epiphytes) in supporting both microbial and macrofaunal food chains is also an area for further study (see Holmer et al 2004, Davis et al 2005, Casu et al 2009 press for examples of the use of Caulerpa spp. as food sources for bacteria and macrofauna).…”

Section: Discussionmentioning

confidence: 99%

Differences in benthic metabolism, nutrient fluxes, and denitrification in Caulerpa taxifolia communities compared to uninvaded bare sediment and seagrass (Zostera capricorni) habitats

Eyre

Maher

Oakes

et al. 2011

Limnology & Oceanography

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Benthic metabolism, nutrient fluxes, and denitrification were measured in Caulerpa taxifolia communities that had recently invaded (between 2003 and 2008) bare sediments following the loss of Zostera capricorni (prior to 2003), and in adjacent Z. capricorni communities and bare sediments, to determine the likely changes in ecosystem function following C. taxifolia colonization. Areas colonized by C. taxifolia had higher gross primary production (GPP), net primary production (NPP), and dark benthic N 2 effluxes than adjacent bare sediments, but lower dark benthic NH z 4 effluxes. C. taxifolia invasion of bare sediments had a beneficial role in removing excess nitrogen from the system through enhanced denitrification. In contrast, areas occupied by C. taxifolia had similar GPP and NPP relative to Z. capricorni beds and similar benthic N 2 and NH z 4 effluxes. Thus, C. taxifolia appears to play a comparable role to Z. capricorni in terms of some ecosystem functions, although the degree of similarity is likely to be affected by the relative densities of the two macrophytes. However, replacement of Z. capricorni communities by C. taxifolia appears to significantly alter the quantity and quality (higher ratio) of benthic dissolved organic carbon and dissolved organic nitrogen fluxes.

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Responses of common SE Australian herbivores to three suspected invasive Caulerpa spp.

Cited by 53 publications

References 53 publications

Does the invasion ofCaulerpa racemosavar.cylindraceaaffect the feeding habits of amphipods (Crustacea: Amphipoda)?

Does the invasion ofCaulerpa racemosavar.cylindraceaaffect the feeding habits of amphipods (Crustacea: Amphipoda)?

Chemical Defenses: From Compounds to Communities

Differences in benthic metabolism, nutrient fluxes, and denitrification in Caulerpa taxifolia communities compared to uninvaded bare sediment and seagrass (Zostera capricorni) habitats

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