Sources of organic matter in Ria Formosa revealed by stable isotope analysis

Machás, Raquel; Santos, Rui

doi:10.1016/s1146-609x(99)00122-8

Cited by 39 publications

(20 citation statements)

References 18 publications

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“…1). The Ria Formosa is a productive coastal lagoon (Sprung 1994a) characterized by high water turnover rates, sand flats, salt marshes and a network of channels and tidal creeks (Sprung 1994a, Machás & Santos 1999, Newton & Mudge 2003. From July 2001 to September 2002, water temperature varied seasonally from 10 to 28°C.…”

Section: Methodsmentioning

confidence: 99%

Distribution of sympatric seahorse species along a gradient of habitat complexity in a seagrass-dominated community

Curtis

Vincent²

2005

Mar. Ecol. Prog. Ser.

128

199

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We present estimates of local population abundance, distribution and habitat preference for 2 European seahorse species, Hippocampus guttulatus and H. hippocampus. We predicted that these sympatric species would partition their habitat into 2 broadly defined habitat types: complex vegetated habitats and sparsely vegetated sand flats. We sampled populations using underwater visual census techniques over landscape (100s to 1000s m) and microhabitat scales (<1 m). Over landscape scales, we estimated abundance and quantified habitat associations using generalized linear models. Over microhabitat scales, we tested for holdfast (attachment site) preferences using selection indices. Both species were patchy in distribution, but H. guttulatus mean density (0.073 ind. m ). At a landscape scale, H. guttulatus abundance was positively correlated with an index of habitat complexity, the percentage of substrate covered by flora and sessile fauna. Conversely, H. hippocampus used more open and less speciose habitats that were subjected to greater oceanic influences. At microhabitat scales, both species significantly preferred grasping holdfasts over barren surfaces, but the species differed in holdfast preferences: H. guttulatus grasped all prospective holdfast types with equal probability while H. hippocampus significantly avoided both fauna and flora that formed large colonies or tracts of dense vegetation. Patterns in habitat use were consistent with differences in morphology and foraging strategy. Despite similar life histories, these sympatric species may respond differently to disturbances that modify habitat structure and complexity over landscape or microhabitat scales.KEY WORDS: Habitat selection · Habitat complexity · Hippocampus · Syngnathidae · Habitat suitability models · Underwater visual census · Foraging strategy Resale or republication not permitted without written consent of the publisher

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Section: Methodsmentioning

confidence: 99%

Distribution of sympatric seahorse species along a gradient of habitat complexity in a seagrass-dominated community

Curtis

Vincent²

2005

Mar. Ecol. Prog. Ser.

128

199

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“…Higher light intensity has been shown to increase sulfate reduction in Z. capricorni vegetated sediments (Hansen et al 2000), which may lead to lower 8 34 S values. Of all the seagrass community food web studies using S isotopes (Peterson et al 1986;Stribling & Cornwell 1997;Machas & Santos 1999;Peterson 1999 ;Kharlamenko et al 2001 ;Machas et al 2003), none have taken into account the potentially high variability of seagrass 8 34 S values over short spatial scales. The data presented here support the findings of Oakes & Connolly (2004) who found a high variability in the 8 34 S signature of Z. capricorni, and stresses the importance of accounting for the high variability in the isotopic signature of primary producers.…”

Section: Nomentioning

confidence: 99%

Macroinvertebrate diet in intertidal seagrass and sandflat communities: A study using C, N, and S stable isotopes

Leduc¹,

Probert²,

Frew³

et al. 2006

New Zealand Journal of Marine and Freshwater Research

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Most seagrass community food-web studies using stable isotopes have been carried out in subtidal habitats during one sampling event. We used C, N, and S stable isotopes to characterise the diet of the dominant macroinvertebrates found in intertidal Zostera capricorni and sandflat communities of southern New Zealand in late summer and winter. The range of δ 13 C and δ 34 S values for Z. capricorni was wide (>5‰), which highlights the importance of accounting for spatial and temporal variability in primary producer isotopic signatures. The range of δ 15 N values for Z. capricorni was comparatively small (

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“…Stable isotope analyses have been used extensively in temperate coastal systems to investigate trophic relationships (Dauby et al 1998, Schaal et al 2010, nutrient inputs (Machás & Santos 1999) and human impacts (McClelland et al 1997). Natural isotopic ratios of carbon and nitrogen in organisms provide information relating to their trophic level relative to each other and possible dietary constituents (Phillips & Gregg 2003, Layman et al 2012), which in turn can help reveal species interactions within a system.…”

Section: Introductionmentioning

confidence: 99%

Biodiversity surveys and stable isotope analyses reveal key differences in intertidal assemblages between tropical seawalls and rocky shores

Lai¹,

Loke²,

Bouma³

et al. 2018

Mar. Ecol. Prog. Ser.

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As coastal cities around the world expand, and sea levels and the frequency of storms rise, natural shorelines are steadily being replaced by artificial defences such as seawalls. A growing number of studies have documented the assemblages that inhabit these novel environments, and some have contrasted them against those found in their natural analogues: rocky shores. Most of this work has, however, been conducted in temperate regions, and there is limited research on seawalls in the tropics. To address this, we conducted monthly surveys of adjacent seawall and rocky shores at multiple sites around Singapore for 1 yr. Our results concur with previous temperate studies -artificial seawalls support a lower diversity but share a substantial number of species with rocky shores. Multivariate analyses reveal that assemblage differences were largely driven by species that were found in both habitats (e.g. detritivore Ligia exotica, grazer Monodonta labio and carnivorous whelk Drupella margariticola) but occurred in different abundances. We also conducted (for the first time on seawalls) stable isotope analyses to elucidate the diets of the common species found in both habitats. Turf algae, which were found to be present in significantly lower abundances on seawalls, could possibly contribute substantially to the diets of many dominant herbivores. Future seawall enhancement efforts in the tropics could therefore look into whether enhancing turf algae will improve biodiversity.

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Sources of organic matter in Ria Formosa revealed by stable isotope analysis

Cited by 39 publications

References 18 publications

Distribution of sympatric seahorse species along a gradient of habitat complexity in a seagrass-dominated community

Distribution of sympatric seahorse species along a gradient of habitat complexity in a seagrass-dominated community

Macroinvertebrate diet in intertidal seagrass and sandflat communities: A study using C, N, and S stable isotopes

Biodiversity surveys and stable isotope analyses reveal key differences in intertidal assemblages between tropical seawalls and rocky shores

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