Pub Date : 2023-08-14DOI: 10.1080/17451000.2023.2235590
A. Fernandes, A. D’Costa, Akhil Nair, S. Jathar, A. Yadav, P. Jha, Vinothkannan Ravichandran, R. Jobby
ABSTRACT Aquaculture is one of the fastest-growing sectors of the food industry and vibriosis is a major disease affecting finfish and shellfish production capabilities. In recent years, probiotics specifically lactic acid bacteria (LAB) have proven to be an environmentally friendly alternative to antibiotics to maintain aquatic animal health. In this study, five strains of indigenous LAB isolated from traditional and non-traditional sources were evaluated for their potency in the prevention of vibriosis in brine shrimp, Artemia salina as a model organism. The LAB were well tolerated at all doses, and no negative effects on the hatching ability of brine shrimps were observed when exposed to Lactiplantibacillus plantarum KCFe63 and Limosilactobacillus fermentum NCCu21. Furthermore, all the tested LAB were able to protect the brine shrimp from the pathogen Vibrio parahaemolyticus under co-exposure and pre-exposure conditions. Molecular docking analysis revealed a high binding affinity of common probiotic metabolites lactic, butyric and propionic acids to the PirAvp and PirBvp proteins of V. parahaemolyticus which can prevent toxin formation and thereby acute hepatopancreatic necrosis disease (AHPND). Overall results suggest that two strains, L. plantarum KCFe63 and L. fermentum NCCu21, are suitable candidates to reduce the incidence of vibriosis and AHPND during brine shrimp cultivation.
{"title":"Protective effects of indigenous lactic acid bacteria in Artemia salina challenged with Vibrio parahaemolyticus: an in vitro and in silico approach","authors":"A. Fernandes, A. D’Costa, Akhil Nair, S. Jathar, A. Yadav, P. Jha, Vinothkannan Ravichandran, R. Jobby","doi":"10.1080/17451000.2023.2235590","DOIUrl":"https://doi.org/10.1080/17451000.2023.2235590","url":null,"abstract":"ABSTRACT Aquaculture is one of the fastest-growing sectors of the food industry and vibriosis is a major disease affecting finfish and shellfish production capabilities. In recent years, probiotics specifically lactic acid bacteria (LAB) have proven to be an environmentally friendly alternative to antibiotics to maintain aquatic animal health. In this study, five strains of indigenous LAB isolated from traditional and non-traditional sources were evaluated for their potency in the prevention of vibriosis in brine shrimp, Artemia salina as a model organism. The LAB were well tolerated at all doses, and no negative effects on the hatching ability of brine shrimps were observed when exposed to Lactiplantibacillus plantarum KCFe63 and Limosilactobacillus fermentum NCCu21. Furthermore, all the tested LAB were able to protect the brine shrimp from the pathogen Vibrio parahaemolyticus under co-exposure and pre-exposure conditions. Molecular docking analysis revealed a high binding affinity of common probiotic metabolites lactic, butyric and propionic acids to the PirAvp and PirBvp proteins of V. parahaemolyticus which can prevent toxin formation and thereby acute hepatopancreatic necrosis disease (AHPND). Overall results suggest that two strains, L. plantarum KCFe63 and L. fermentum NCCu21, are suitable candidates to reduce the incidence of vibriosis and AHPND during brine shrimp cultivation.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42293851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-03DOI: 10.1080/17451000.2023.2235591
S. Paul, Samya Karan, B. Bhattacharya
ABSTRACT Tropical cyclones are increasingly affecting estuarine communities. The effects of category-5 tropical cyclone Amphan (landfall on 20 May 2020 near the Ganges estuary mouth) on the copepod community of the Ganges estuary were studied. Copepod assemblages were sampled before (February–December 2019), shortly after (31 May–12 June 2020) and post-(September–November 2020) Amphan periods. It was hypothesized that shortly after Amphan a relatively homogeneous community consisting of a few estuarine specialists would succeed but that would soon be replaced by a heterogeneous one; however, those specialists would continue their dominance. Shortly after Amphan species richness declined but the recovery process was completed within months, led by Paracalanus parvus, Bestiolina similis, Acartia spinicauda, Acartiella tortaniformis and Oithona brevicornis. Spatial homogeneity of the community that prevailed in pre- and shortly after Amphan was lost in post-Amphan. The unilateral dominance of B. similis observed in the pre-Amphan period was challenged by P. parvus, A. spinicauda, A. tortaniformis and O. brevicornis after Amphan. Shortly after Amphan A. spinicauda proliferated and co-dominated the estuary with A. tortaniformis but the latter replaced the former within a few months. The copepod community experienced rearrangements in species composition, abundance and dominance hierarchy; therefore, its regular monitoring is recommended.
{"title":"Effects of tropical cyclone Amphan on the copepods of the Ganges estuary","authors":"S. Paul, Samya Karan, B. Bhattacharya","doi":"10.1080/17451000.2023.2235591","DOIUrl":"https://doi.org/10.1080/17451000.2023.2235591","url":null,"abstract":"ABSTRACT Tropical cyclones are increasingly affecting estuarine communities. The effects of category-5 tropical cyclone Amphan (landfall on 20 May 2020 near the Ganges estuary mouth) on the copepod community of the Ganges estuary were studied. Copepod assemblages were sampled before (February–December 2019), shortly after (31 May–12 June 2020) and post-(September–November 2020) Amphan periods. It was hypothesized that shortly after Amphan a relatively homogeneous community consisting of a few estuarine specialists would succeed but that would soon be replaced by a heterogeneous one; however, those specialists would continue their dominance. Shortly after Amphan species richness declined but the recovery process was completed within months, led by Paracalanus parvus, Bestiolina similis, Acartia spinicauda, Acartiella tortaniformis and Oithona brevicornis. Spatial homogeneity of the community that prevailed in pre- and shortly after Amphan was lost in post-Amphan. The unilateral dominance of B. similis observed in the pre-Amphan period was challenged by P. parvus, A. spinicauda, A. tortaniformis and O. brevicornis after Amphan. Shortly after Amphan A. spinicauda proliferated and co-dominated the estuary with A. tortaniformis but the latter replaced the former within a few months. The copepod community experienced rearrangements in species composition, abundance and dominance hierarchy; therefore, its regular monitoring is recommended.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49186499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-26DOI: 10.1080/17451000.2023.2235571
Yuliya A. Zagorodnyaya, S. Piontkovski, Vladimir V. Gubanov
ABSTRACT Following up on the issue of worldwide growing gelatinous plankton dominance, we analysed historical records on zooplankton biomass from the 1970s to the present, in order to assess the ratio of gelatinous- to-non-gelatinous zooplankton (GN). The latter is poorly analysed in current publications featuring the Black Sea pelagic ecosystem. The GN characterizes the quality of zooplankton as a food source for small pelagic fishes which dominate Black Sea fishery. The retrospective analysis of zooplankton biomass constituents in coastal and open sea waters retrieved from published papers was complemented by an 11-year sampling (up until 2021), across the Crimean shelf. The comparison over regions (represented by the north-eastern, the northern, the north-western, the southern and the open sea) showed that the jellyfish Aurelia aurita, the ctenophore Mnemiopsis leidyi, and the dinoflagellate Noctiluca scintillans act as major contributors to the total gelatinous biomass of the 2000s, on a basin scale. On average, the wet gelatinous biomass is about one hundred times that of the non-gelatinous one. High values of the GN ratio (in wet mass and in carbon units) in coastal waters indirectly imply a leading role of a detritus pathway of organic matter in a pelagic ecosystem.
{"title":"The pelagic ecosystem of the Black Sea goes gelatinous","authors":"Yuliya A. Zagorodnyaya, S. Piontkovski, Vladimir V. Gubanov","doi":"10.1080/17451000.2023.2235571","DOIUrl":"https://doi.org/10.1080/17451000.2023.2235571","url":null,"abstract":"ABSTRACT Following up on the issue of worldwide growing gelatinous plankton dominance, we analysed historical records on zooplankton biomass from the 1970s to the present, in order to assess the ratio of gelatinous- to-non-gelatinous zooplankton (GN). The latter is poorly analysed in current publications featuring the Black Sea pelagic ecosystem. The GN characterizes the quality of zooplankton as a food source for small pelagic fishes which dominate Black Sea fishery. The retrospective analysis of zooplankton biomass constituents in coastal and open sea waters retrieved from published papers was complemented by an 11-year sampling (up until 2021), across the Crimean shelf. The comparison over regions (represented by the north-eastern, the northern, the north-western, the southern and the open sea) showed that the jellyfish Aurelia aurita, the ctenophore Mnemiopsis leidyi, and the dinoflagellate Noctiluca scintillans act as major contributors to the total gelatinous biomass of the 2000s, on a basin scale. On average, the wet gelatinous biomass is about one hundred times that of the non-gelatinous one. High values of the GN ratio (in wet mass and in carbon units) in coastal waters indirectly imply a leading role of a detritus pathway of organic matter in a pelagic ecosystem.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45518616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-28DOI: 10.1080/17451000.2023.2224026
S. Mgeleka, M. Silas, Cretus Mtonga, C. Rumisha, Elina Viinamäki, P. Polte, M. Sköld, M. Winder, M. Gullström
ABSTRACT The hound needlefish Tylosurus crocodilus (Belonidae) is a highly demanded fish in the local markets of Tanzania, but the growing coastal population threatens its sustainability. As belonids are highly migratory fishes utilising various parts of the seascape, increased fishing pressure may disrupt connectivity patterns on different spatiotemporal scales and disaggregate populations. Using the COI gene, this study assessed the genetic population structure, connectivity patterns, and historical demography of T. crocodilus collected in seven sites spread along Tanzanian coastal waters. Results showed fourteen haplotypes with low overall nucleotide and haplotype diversity. Pairwise FST comparisons revealed no significant differences among the sampled sites, except for the northernmost site (Tanga) and an island in the south (Songosongo). Analysis of molecular variance (AMOVA) revealed a non-significant genetic structure among populations (FST = 0.01782), suggesting the fishery across Tanzanian waters exploits the same population. Moreover, there was no correlative relationship between genetic and pairwise geographic distances, rejecting the isolation by distance hypothesis. However, neutrality tests and mismatch distribution analysis revealed that recent demographic expansion might exist. Empirical evidence of panmixia suggests high genetic connectivity. In combination with low genetic diversity, management should be directed to actions that prevent genetic diversity loss and the effect of genetic drift on populations.
{"title":"Population genetics of the hound needlefish Tylosurus crocodilus (Belonidae) indicate high connectivity in Tanzanian coastal waters","authors":"S. Mgeleka, M. Silas, Cretus Mtonga, C. Rumisha, Elina Viinamäki, P. Polte, M. Sköld, M. Winder, M. Gullström","doi":"10.1080/17451000.2023.2224026","DOIUrl":"https://doi.org/10.1080/17451000.2023.2224026","url":null,"abstract":"ABSTRACT The hound needlefish Tylosurus crocodilus (Belonidae) is a highly demanded fish in the local markets of Tanzania, but the growing coastal population threatens its sustainability. As belonids are highly migratory fishes utilising various parts of the seascape, increased fishing pressure may disrupt connectivity patterns on different spatiotemporal scales and disaggregate populations. Using the COI gene, this study assessed the genetic population structure, connectivity patterns, and historical demography of T. crocodilus collected in seven sites spread along Tanzanian coastal waters. Results showed fourteen haplotypes with low overall nucleotide and haplotype diversity. Pairwise FST comparisons revealed no significant differences among the sampled sites, except for the northernmost site (Tanga) and an island in the south (Songosongo). Analysis of molecular variance (AMOVA) revealed a non-significant genetic structure among populations (FST = 0.01782), suggesting the fishery across Tanzanian waters exploits the same population. Moreover, there was no correlative relationship between genetic and pairwise geographic distances, rejecting the isolation by distance hypothesis. However, neutrality tests and mismatch distribution analysis revealed that recent demographic expansion might exist. Empirical evidence of panmixia suggests high genetic connectivity. In combination with low genetic diversity, management should be directed to actions that prevent genetic diversity loss and the effect of genetic drift on populations.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43140069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-28DOI: 10.1080/17451000.2023.2203500
Yean Das, K. Karunarathne, Mishal Roy, M. S. N. Chowdhury, S. Sharifuzzaman
ABSTRACT Geographic ranges of some members of the genus Crambionella are not clarified so far. In the context of C. annandalei Rao, 1931, which has been reported only from India and Myanmar, herein we document the first record of this species from the coastal waters of Bangladesh, Bay of Bengal, providing a detailed account of characters, morphometric measurements and illustrations. A comparison of morphological features of C. annandalei from different geographic locations and its congeners is presented, including notes on its fishery value. A cautious review on the occurrence of Crambionella species within the Indian Ocean suggests that geographic distributions of each species are constrained within certain areas around their type localities. Thus, C. annandalei, C. helmbiru, C. orsini and C. stuhlmanni occur in the north-east, south-east, north-west and south-west regions of the Indian Ocean, respectively, without or with a minimum overlapping of each other. All four species occur during both summer and winter seasons of the Indian Ocean.
{"title":"Record of Crambionella annandalei Rao, 1931 from Bangladesh, with a review of the geographic distribution of the genus Crambionella (Cnidaria: Scyphozoa)","authors":"Yean Das, K. Karunarathne, Mishal Roy, M. S. N. Chowdhury, S. Sharifuzzaman","doi":"10.1080/17451000.2023.2203500","DOIUrl":"https://doi.org/10.1080/17451000.2023.2203500","url":null,"abstract":"ABSTRACT Geographic ranges of some members of the genus Crambionella are not clarified so far. In the context of C. annandalei Rao, 1931, which has been reported only from India and Myanmar, herein we document the first record of this species from the coastal waters of Bangladesh, Bay of Bengal, providing a detailed account of characters, morphometric measurements and illustrations. A comparison of morphological features of C. annandalei from different geographic locations and its congeners is presented, including notes on its fishery value. A cautious review on the occurrence of Crambionella species within the Indian Ocean suggests that geographic distributions of each species are constrained within certain areas around their type localities. Thus, C. annandalei, C. helmbiru, C. orsini and C. stuhlmanni occur in the north-east, south-east, north-west and south-west regions of the Indian Ocean, respectively, without or with a minimum overlapping of each other. All four species occur during both summer and winter seasons of the Indian Ocean.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44558450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-28DOI: 10.1080/17451000.2023.2213894
M. Akrong, A. Anning, G. Addico, J. Hogarh, A. A. fi, K. deGraft-Johnson, M. Ale, J. Ampofo, A. Meyer, C. Quintana
ABSTRACT Seaweed associated bacteria can be exploited for sustainable production and conservation of seaweeds, although limited information exists in several coastal waters in West Africa. Here, the diversity and abundance of bacteria on five seaweeds, Sargassum vulgare, Padina durvillaei, Hydropuntia dentata, Hypnea musciformis and Ulva fasciata, and surrounding seawaters across five coastal sites in the Central and Western regions of Ghana were investigated. Biochemical tests and MALDI–TOF identification system were used to determine the bacteria diversity and abundance on the seaweeds and seawater. A total of 530 bacterial isolates, belonging to 28 species (and mostly Proteobacteria and Firmicutes) were identified. A higher diversity of bacteria species was found associated with the seaweeds (83%) than in seawater (17%). Bacterial composition was similar among taxonomically-related seaweeds. The brown (S. vulgare) and red (H. musciformis) seaweeds recorded the most and least diverse bacterial assemblage, respectively. Seasonally, bacterial diversity and abundance were marginally higher in the wet season. The study provides important baseline information on the spatial, temporal and taxonomic distribution of bacteria associated with commercially valuable seaweed species in the coastal areas of Ghana. The results are also important for the sustainable exploitation and conservation of these important macroalgae in Ghana and elsewhere.
{"title":"Variations in seaweed-associated and planktonic bacterial communities along the coast of Ghana","authors":"M. Akrong, A. Anning, G. Addico, J. Hogarh, A. A. fi, K. deGraft-Johnson, M. Ale, J. Ampofo, A. Meyer, C. Quintana","doi":"10.1080/17451000.2023.2213894","DOIUrl":"https://doi.org/10.1080/17451000.2023.2213894","url":null,"abstract":"ABSTRACT Seaweed associated bacteria can be exploited for sustainable production and conservation of seaweeds, although limited information exists in several coastal waters in West Africa. Here, the diversity and abundance of bacteria on five seaweeds, Sargassum vulgare, Padina durvillaei, Hydropuntia dentata, Hypnea musciformis and Ulva fasciata, and surrounding seawaters across five coastal sites in the Central and Western regions of Ghana were investigated. Biochemical tests and MALDI–TOF identification system were used to determine the bacteria diversity and abundance on the seaweeds and seawater. A total of 530 bacterial isolates, belonging to 28 species (and mostly Proteobacteria and Firmicutes) were identified. A higher diversity of bacteria species was found associated with the seaweeds (83%) than in seawater (17%). Bacterial composition was similar among taxonomically-related seaweeds. The brown (S. vulgare) and red (H. musciformis) seaweeds recorded the most and least diverse bacterial assemblage, respectively. Seasonally, bacterial diversity and abundance were marginally higher in the wet season. The study provides important baseline information on the spatial, temporal and taxonomic distribution of bacteria associated with commercially valuable seaweed species in the coastal areas of Ghana. The results are also important for the sustainable exploitation and conservation of these important macroalgae in Ghana and elsewhere.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42159709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-28DOI: 10.1080/17451000.2023.2224025
Jiang Fang, Qi Li
ABSTRACT The Pacific oyster (Crassostrea gigas) is a commercially important shellfish widely cultured worldwide. Understanding the effect of inbreeding on C. gigas is critical to the long-term feasibility of breeding programmes, especially when selected lines are developed in hatcheries with limited effective population sizes. The effect of inbreeding on stress resistance in C. gigas remains to be explored. The present study evaluated the physiological and immune responses to different temperatures (16–36°C) and salinities (20–40 psu) in an inbreeding line and a wild population of C. gigas. Two physiological parameters, including ammonia-N excretion rate (AER) and oxygen consumption rate (OCR), and three enzyme activities including superoxide dismutase activity (SOD), catalase activity (CAT), and contents of malondialdehyde (MDA) were measured on day 14 of the temperature and salinity exposure. Compared with the wild population, the physiological parameters (AER and OCR) were significantly lower, and the enzyme activities (SOD, CAT, and MDA) were significantly higher in the inbreeding line at suboptimal temperatures or salinities. These results showed that inbreeding has negative effects on stress resistance in C. gigas. In addition, multiple groups with different inbreeding levels would be needed to quantify the effects of inbreeding on stress resistance in C. gigas. KEY POLICY HIGHLIGHTS This is the first study to examine the effect of inbreeding on the stress resistance of C. gigas under temperature and salinity challenges. Inbred oysters showed an equally good performance as wild oysters under benign conditions. The potential disadvantages of inbred oysters in adaptive capacity were shown at suboptimal conditions.
{"title":"The effects of inbreeding on stress resistance of the Pacific oyster Crassostrea gigas at different temperatures and salinities","authors":"Jiang Fang, Qi Li","doi":"10.1080/17451000.2023.2224025","DOIUrl":"https://doi.org/10.1080/17451000.2023.2224025","url":null,"abstract":"ABSTRACT The Pacific oyster (Crassostrea gigas) is a commercially important shellfish widely cultured worldwide. Understanding the effect of inbreeding on C. gigas is critical to the long-term feasibility of breeding programmes, especially when selected lines are developed in hatcheries with limited effective population sizes. The effect of inbreeding on stress resistance in C. gigas remains to be explored. The present study evaluated the physiological and immune responses to different temperatures (16–36°C) and salinities (20–40 psu) in an inbreeding line and a wild population of C. gigas. Two physiological parameters, including ammonia-N excretion rate (AER) and oxygen consumption rate (OCR), and three enzyme activities including superoxide dismutase activity (SOD), catalase activity (CAT), and contents of malondialdehyde (MDA) were measured on day 14 of the temperature and salinity exposure. Compared with the wild population, the physiological parameters (AER and OCR) were significantly lower, and the enzyme activities (SOD, CAT, and MDA) were significantly higher in the inbreeding line at suboptimal temperatures or salinities. These results showed that inbreeding has negative effects on stress resistance in C. gigas. In addition, multiple groups with different inbreeding levels would be needed to quantify the effects of inbreeding on stress resistance in C. gigas. KEY POLICY HIGHLIGHTS This is the first study to examine the effect of inbreeding on the stress resistance of C. gigas under temperature and salinity challenges. Inbred oysters showed an equally good performance as wild oysters under benign conditions. The potential disadvantages of inbred oysters in adaptive capacity were shown at suboptimal conditions.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48280539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-28DOI: 10.1080/17451000.2023.2224027
Raibel Núñez-González, S. M. Pauls
ABSTRACT Echinometra lucunter is a common Caribbean sea urchin, which the abundance and distribution were evaluated along a rocky platform at Cepe beach, Venezuela. Two surveys were conducted along transects perpendicular and parallel to the coast, from the shore to the wave breaking zone (WB), using 1m2 quadrat method. In survey-1 the smaller sea urchins (<1.8 cm) occurred in the tide pool zone (TP) and medium and large dominated in the WB. The average density recorded in the WB and TP (140.2 and 272.7 ind/m2 respectively) are among the highest values reported in the Caribbean. The maximum density recorded was 562 ind/m2 in the TP and most of them were juveniles (<1.8 cm). In survey-2 sea urchins (³3.0 cm) density ranged from 1 to 156 ind/m2 and the overall average was 29.6 (± 32.4) ind/m2. The highest density occurred in the platform western sector (average 43.2 ±41.3 ind/m2). In the transects parallel to the coast the sea urchin's abundance gradually decreased from the WB (130 ±12 ind/m2) towards the coast (0.3 ±0.37 ind/m2). In conclusion, the E. lucunter densities recorded on the Cepe beach platform are the highest values reported in the Caribbean.
{"title":"Abundance and distribution of Echinometra lucunter (Echinodermata, Echinoidea) at a rocky platform on the central coast of Venezuela","authors":"Raibel Núñez-González, S. M. Pauls","doi":"10.1080/17451000.2023.2224027","DOIUrl":"https://doi.org/10.1080/17451000.2023.2224027","url":null,"abstract":"ABSTRACT Echinometra lucunter is a common Caribbean sea urchin, which the abundance and distribution were evaluated along a rocky platform at Cepe beach, Venezuela. Two surveys were conducted along transects perpendicular and parallel to the coast, from the shore to the wave breaking zone (WB), using 1m2 quadrat method. In survey-1 the smaller sea urchins (<1.8 cm) occurred in the tide pool zone (TP) and medium and large dominated in the WB. The average density recorded in the WB and TP (140.2 and 272.7 ind/m2 respectively) are among the highest values reported in the Caribbean. The maximum density recorded was 562 ind/m2 in the TP and most of them were juveniles (<1.8 cm). In survey-2 sea urchins (³3.0 cm) density ranged from 1 to 156 ind/m2 and the overall average was 29.6 (± 32.4) ind/m2. The highest density occurred in the platform western sector (average 43.2 ±41.3 ind/m2). In the transects parallel to the coast the sea urchin's abundance gradually decreased from the WB (130 ±12 ind/m2) towards the coast (0.3 ±0.37 ind/m2). In conclusion, the E. lucunter densities recorded on the Cepe beach platform are the highest values reported in the Caribbean.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41893764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-12DOI: 10.1080/17451000.2023.2203499
N. Başçınar, D. Misir, C. Altuntaş, Y. Genç, M. Dağtekin, M. Erbay, Gülsüm Balçık Mısır, Erdinç Aydın
ABSTRACT The sex ratio, length–weight relationship (LWR) and diets based on stomach contents of whiting (Merlangius merlangus) were investigated in the south-eastern Black Sea, Turkey. A total of 3507 females (7.5–24.0 cm), 1602 males (9.4–20.0 cm), and 78 unidentified sex (5.5–16.5 cm) whiting were caught during monthly sampling from February to December 2017. The sex ratio was dominated by females, and their ratio (♀:♂, 1:0.46) significantly deviated from 1:1. The LWR indicated a negative allometric growth for males, while females had a positive allometric growth pattern. The stomach content analysis based on the relative importance index (IRI%) indicated exclusively piscivorous diets dominant by Sprattus sprattus and Engraulis encrasicolus made up more than 91 IRI% of the total diets of M. merlangus. The modified Costello-Amundsen’s graphical analyses evinced the specialized feeding strategy of M. merlangus throughout this study. The contribution of these two preys to the diets of M. merlangus showed considerable seasonal variations that were totally dependent on their abundance. Sprattus sprattus contributed to more than 98% of the total diets during June, July and August, while in the following months, E. encrasicolus appeared to take its position. Based on fish size, a general trend of a rise in prey diversity was found with increasing fish size. Also, the contribution of S. sprattus tended to decrease with increasing predator size, which is replaced by a rise in E. encrasicolus contribution. Hence, larger M. merlangus predominantly fed on E. encrasicolus while smaller size predators preferred to feed on S. sprattus.
{"title":"Length–weight relationship and seasonal variations in diet composition of whiting (Merlangius merlangus) in the South-eastern Black Sea","authors":"N. Başçınar, D. Misir, C. Altuntaş, Y. Genç, M. Dağtekin, M. Erbay, Gülsüm Balçık Mısır, Erdinç Aydın","doi":"10.1080/17451000.2023.2203499","DOIUrl":"https://doi.org/10.1080/17451000.2023.2203499","url":null,"abstract":"ABSTRACT The sex ratio, length–weight relationship (LWR) and diets based on stomach contents of whiting (Merlangius merlangus) were investigated in the south-eastern Black Sea, Turkey. A total of 3507 females (7.5–24.0 cm), 1602 males (9.4–20.0 cm), and 78 unidentified sex (5.5–16.5 cm) whiting were caught during monthly sampling from February to December 2017. The sex ratio was dominated by females, and their ratio (♀:♂, 1:0.46) significantly deviated from 1:1. The LWR indicated a negative allometric growth for males, while females had a positive allometric growth pattern. The stomach content analysis based on the relative importance index (IRI%) indicated exclusively piscivorous diets dominant by Sprattus sprattus and Engraulis encrasicolus made up more than 91 IRI% of the total diets of M. merlangus. The modified Costello-Amundsen’s graphical analyses evinced the specialized feeding strategy of M. merlangus throughout this study. The contribution of these two preys to the diets of M. merlangus showed considerable seasonal variations that were totally dependent on their abundance. Sprattus sprattus contributed to more than 98% of the total diets during June, July and August, while in the following months, E. encrasicolus appeared to take its position. Based on fish size, a general trend of a rise in prey diversity was found with increasing fish size. Also, the contribution of S. sprattus tended to decrease with increasing predator size, which is replaced by a rise in E. encrasicolus contribution. Hence, larger M. merlangus predominantly fed on E. encrasicolus while smaller size predators preferred to feed on S. sprattus.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46967672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-03DOI: 10.1080/17451000.2023.2203504
Hellen Ceriello, S. Stampar
ABSTRACT Behaviour research on Cnidaria, particularly Ceriantharia (Cnidaria, Anthozoa), is generally uncommon. Although ceriantharians or tube-dwelling anemones are known to build soft tubes, their tube-building behaviours remain unknown. In this study, we describe for the first time the tube-building behaviour of Ceriantheomorphe brasiliensis and detail its behaviour in natural habitat, including illustrations and videos of live specimens. Our results showed that C. brasiliensis can build more than one tube throughout its life, the tubes are usually ‘L-shaped’, longer than the polyp, and vertically oriented when built in deeper substrates, but horizontally oriented when built in shallower substrates. During tube construction, the polyp does not feed or use its tentacles to catch or select specific sediment particle sizes for tube construction. Given the vertical orientation of the tube, it is possible that the tube-building behaviour of C. brasiliensis differs from that of other species. Although this study only included a single specimen, the behaviours observed were constantly repeated by the animal in every test, from the first trial to the last, suggesting that they can occur on occasion. Furthermore, this research contains useful information that may guide future studies of tube-building behaviour in Ceriantharia which are, currently, non-existent.
{"title":"Ceriantheomorphe brasiliensis (Cnidaria; Ceriantharia): how does it behave?","authors":"Hellen Ceriello, S. Stampar","doi":"10.1080/17451000.2023.2203504","DOIUrl":"https://doi.org/10.1080/17451000.2023.2203504","url":null,"abstract":"ABSTRACT Behaviour research on Cnidaria, particularly Ceriantharia (Cnidaria, Anthozoa), is generally uncommon. Although ceriantharians or tube-dwelling anemones are known to build soft tubes, their tube-building behaviours remain unknown. In this study, we describe for the first time the tube-building behaviour of Ceriantheomorphe brasiliensis and detail its behaviour in natural habitat, including illustrations and videos of live specimens. Our results showed that C. brasiliensis can build more than one tube throughout its life, the tubes are usually ‘L-shaped’, longer than the polyp, and vertically oriented when built in deeper substrates, but horizontally oriented when built in shallower substrates. During tube construction, the polyp does not feed or use its tentacles to catch or select specific sediment particle sizes for tube construction. Given the vertical orientation of the tube, it is possible that the tube-building behaviour of C. brasiliensis differs from that of other species. Although this study only included a single specimen, the behaviours observed were constantly repeated by the animal in every test, from the first trial to the last, suggesting that they can occur on occasion. Furthermore, this research contains useful information that may guide future studies of tube-building behaviour in Ceriantharia which are, currently, non-existent.","PeriodicalId":18195,"journal":{"name":"Marine Biology Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44586866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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