Seasonality and phenology of an epiphytic calcareous red alga, Hydrolithon boreale, on the leaves of Posidonia oceanica (L) Delile in the Turkish water

Mutlu, Erhan; Karaca, Doğukan; Duman, Güler; Şahin, Ahmet; Özvarol, Yaşar; Olguner, Cansu

doi:10.1007/s11356-022-23333-w

Cited by 9 publications

(13 citation statements)

References 65 publications

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“…Mutlu and Olguner [61] estimated the contribution of a calcareous alga, Pneophyllum fragile to the EDSUs of leaves of C. nodosa, and the contributions remained below the threshold of the leaves depending on abundance (ind/m 2 ) of the alga. Another calcareous alga, Hydrolithon boreale occurred recently on leaves of P. oceanica at the present study, its abundances were found to be low as compared of that of C. nodosa [35,61].…”

Section: Discussionsupporting

confidence: 40%

“…Regarding to the package POSIBIOM, one issue is the avoidance from the usage of the destructive methods to study the meadows under the protection [34][35][36]. Besides, the previous remote sensing techniques produced only coverage and mapping of the different habitats (e.g., Fakiris et al [48]; Dimas et al [49]).…”

Section: Discussionmentioning

confidence: 99%

“…In many cases, the macrophytes and seagrass had unstable relationships specifically with oscillation between the EDSUs and biometrics in time and space [60,61]. These all relationships biased the estimates besides the other scatterers were available suchlike as epiphytes on the leaves and fishes among the seagrass [35,59,61]. The meadow showed inconsistent linear relationships in some seasons [60] when its biological and physiological activities were intensified [83].…”

Section: Discussionmentioning

confidence: 99%

“…Compared to fish and zooplankton acoustics, vegetations acoustics have not however attracted significant attention of researchers. The destructive sampling methods (SCUBA sampling to pick up the seagrass) are not generally desired to sample the meadow under the protection [34][35][36]. Therefore, many studies were fronted to apply non-destructive methods, remote sensing systems to study sensitive and vulnerable seaweeds and seagrass [37].…”

Section: Introductionmentioning

confidence: 99%

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A Package of Script Codes, POSIBIOM for Vegetation Acoustics;<em> POSIdonia</em> BIOMass

Mutlu¹

2023

Preprint

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Macrophytes and seagrasses play a crucial role with a variety of the functions in the marine ecosystem and respond synchronized-promptly to the changing climate, followed by ecological status. Monitoring of the seagrasses was one of the paramount topics at the marine environment. One of the fast monitoring techniques is the vegetation acoustics with the advantages compared to the other remote sensing techniques. The acoustic method alone is ambitious to sea-truth identities of the backscatterers at the sea. Therefore, a package of computer programs was developed to identify, estimate leaf biometrics (leaf length and biomass) of one of the common seagrasses, Posidonia oceanica. Some troubleshooting in the acoustical data were fixed and then solved to reach the estimates regarding to the matters encountered for the vegetation as well as fisheries and plankton acoustics. One of the trouble was the “Lost” bottom which occurred during the data collection and post-processing due to occurrence of the acoustical noises, reverberations, interferences and intense scatterers suchlike fish schools. Another problem to remove was the occurrence as studying the near-bottom echoes belonging to submerged vegetations such as seagrasses, followed by spurious echoes. Last one was recognition of the seagrass to estimate leaf length and biomass calibrating the sheaths/vertical rhizome of the seagrass and establishing relationships between acoustical units and biometrics, respectively. As a consequence, an autonomous package of the code written in language MatLab was developed to perform all processes, and the name of the package was abbreviated as POSIBIOM, POSIdonia BIOMass. This study presented the algorithms, methodology, acoustics-biometrics relation, and mapping of the biometrics for the first time, and discussed advantages and disadvantages of the package compared to the software purposed for the bottom types, habitat and vegetation acoustic. The future studies were recommended to improve the package.

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Section: Discussionsupporting

confidence: 40%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Package of Script Codes, POSIBIOM for Vegetation Acoustics;<em> POSIdonia</em> BIOMass

Mutlu¹

2023

Preprint

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“…Most seaweeds have been under protection. Therefore, the description of the destructive sampling has been specialized for the seagrass as follows; sampling more than 1000 shoots (Mutlu et al, 2022c), more than orthotropic shoots n = 20 (Pergent et al, 1995), and more than one-third of the sampling quadrant by cutting leaves above the ligule to recover (Gobert et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Density-depended Acoustical Identification of Two Common Seaweeds (Posidonia Oceanica and Cymodocea Nodosa) in the Mediterranean Sea

Mutlu

Olguner²

2023

Thalassas

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The non-destructive samplings are very important in not damaging seagrasses and seaweed under protection, at the eld studies. The grasses are prominent in the assessment of the ecological status of the marine environments. One of the effective non-destructive samplings was the acoustical methods which need a low level of the sea and atmospheric conditions as compared to the other remote sensing system. Like the others, acoustic data alone are inherently ambiguous concerning the identities of the scatterers and need sea-truthing at the eld studies. Considering the requirements above and the advantages of the acoustical methods, an acoustical in situ study was conducted to discriminate two dominant seagrasses along the western Turkish Mediterranean coast in August (in the year 2012) when biometrics of both species was at maxima. Four different regions were involved in the study during data collection using a split beam echosounder operated at 206 kHz since each region had different strengths of their biometrics re ecting regional variations of the acoustical measurements. For discrimination, a statistical approach based on the acoustical parameters and their statistics was enriched and validated with multivariate analyses (Silhouette, k-means, PCA and CAP analyses). Posidonia oceanica was correlated with mean, median, SD and maximum value of Sa, whereas Cymodocea nodosa was characterized by hardness and roughness of leaf echo, followed by skewness and kurtosis of Sa. The acoustics of C. nodosa were related to regional differences, but P. oceanica was related to the depthwise difference. Both species had highly different densities (g/cm 3 ), followed by biomass. The present study will interactively help acoustical studies to be more common and comprehensible and the other previous studies published did as well.Recently, in/ex situ acoustical studies have increased to relate the biometrics to the Elementary Distance Sampling Unit (EDSU, Simmonds and

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A Broad-scale Biometrical Response of Pristine Posidonia Oceanica Meadow to Winter and Summer Conditions in the North-eastern Mediterranean Coast

Mutlu,

Duman,

Karaca

et al. 2024

Thalassas

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The concept of the present study was derived from a study to ground-truth the acoustical echo energy of the seagrass biometrics in order not to use any destructive method and was scoped to study the estimated environment-related biometrical distribution of a pristine marine phanerogam, Posidonia oceanica meadow, along the entire Turkish Mediterranean coast. This study also provided the rst knowledge on the broad-scale extent of the meadow from a signi cant coast length in the Mediterranean Sea. For this purpose, two surveys were conducted covering bottom depths of 5-35 m in the critical seasons (winter and summer 2019) of a subtropical coast for the growth dynamics of the meadow. The meadow samples were collected in a frame of 0.4 x 0.4 m by SCUBA divers, which was a destructive method. The physicochemical and optical environments of the water were evaluated with the biometrical dynamics of the meadow. Orderly, season, region, bottom types, and bottom depths dictated the biometrical distribution. The meadow shoot density showed the environment to be in good ecological condition without changing the average shoot density in season. Other biometrics grew 2-fold higher in summer compared to winter (water temperature and salinity). The region in uenced by the Aegean Sea had lower biometrical values than the other two regions. Hard (rock and matte) and soft (sand and mud) benthic environments differentiated the biometrics as follows: Contrary to the morphometric variables, the density biometrics decreased linearly from the hard bottom to the soft bottom. The density dynamics were partially contrasted with the morphometrical dynamics. Rhizome-related biometrics were independently governed by the leaf-related biometrics, especially by nitrogen-based nutrients in nearbottom water. The optical parameter, especially PAR, a certain percent of the daylight was effective during the growth of the biometrics. The present study provided the rst knowledge on a broad-scale biometrical distribution from the entire Turkish Mediterranean coast to the seagrass studies.

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Seasonality and phenology of an epiphytic calcareous red alga, Hydrolithon boreale, on the leaves of Posidonia oceanica (L) Delile in the Turkish water

Cited by 9 publications

References 65 publications

A Package of Script Codes, POSIBIOM for Vegetation Acoustics;<em> POSIdonia</em> BIOMass

A Package of Script Codes, POSIBIOM for Vegetation Acoustics;<em> POSIdonia</em> BIOMass

Density-depended Acoustical Identification of Two Common Seaweeds (Posidonia Oceanica and Cymodocea Nodosa) in the Mediterranean Sea

A Broad-scale Biometrical Response of Pristine Posidonia Oceanica Meadow to Winter and Summer Conditions in the North-eastern Mediterranean Coast

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