Papers by Rodrigo Johnsson
PeerJ
Background The increasing habitat heterogeneity and complexity shows positive effects over differ... more Background The increasing habitat heterogeneity and complexity shows positive effects over different communities, leading to environmental diversity, access to resources and reducing the effectiveness of predation. In the present study we evaluate the structural and functional patterns of polychaete assemblages of three Mussismilia species with different coral morphology. Mussismilia hispida has a massive growth pattern; M. braziliensis also is a massive coral but forms a crevice in the corallum base; and M. harttii has a meandroid pattern. Methods Ten individuals of the three Mussismilia species were sampled in two reefs in the Todos-os-Santos Bay, and we analyzed the differences in richness and abundance of polychaete species and the functional diversity metrics: Rao’s quadratic entropy, functional dispersion, functional evenness, number of functional groups and functional richness, among Mussismilia species. Results Two-way ANOVA with permutations showed significant differences f...
Protocolos para o monitoramento de habitats bentônicos costeiros - Rede de Monitoramento de Habitat Bentônicos Costeiros - ReBentos, 2015
Available from SciELO Books <http://books.scielo.org>. All the contents of this work, except wher... more Available from SciELO Books <http://books.scielo.org>. All the contents of this work, except where otherwise noted, is licensed under a Creative Commons Attribution-Non Commercial-ShareAlike 3.0 Unported. Todo o conteúdo deste trabalho, exceto quando houver ressalva, é publicado sob a licença Creative Commons Atribuição-Uso Não Comercial-Partilha nos Mesmos Termos 3.0 Não adaptada. Todo el contenido de esta obra, excepto donde se indique lo contrario, está bajo licencia de la licencia Creative Commons Reconocimento-NoComercial-CompartirIgual 3.0 Unported.
Journal of the Marine Biological Association of the United Kingdom, 2021
Habitat structure increases richness and abundance of species in many environments by providing e... more Habitat structure increases richness and abundance of species in many environments by providing easy access to resources and refuge from predators. In coral reefs, corals are habitat for many organisms and differences in their morphologies may act as variation in habitat structure for associated fauna. In the present study, we investigate whether there are differences in the richness and abundance of molluscs associated with three species of Mussismilia corals exhibiting different growth morphologies, in two different reef areas of the Bahia state. Mussismilia harttii has a meandroid pattern, M. hispida is a massive coral, M. braziliensis also has a massive growth pattern with crevices at the corallum base. Coral characteristics were measured in the laboratory. Significant differences were identified for richness among coral species – higher values were reported in colonies of M. harttii and no significant statistical differences were observed between M. braziliensis and M. hispida....
Marine Biodiversity, Jul 13, 2023
Research Square (Research Square), Mar 7, 2023
Two Astrangia Milne Edwards & Haime, species have been identi ed in shallow water environments al... more Two Astrangia Milne Edwards & Haime, species have been identi ed in shallow water environments along the Brazilian coast: A. solitaria (Le Sueur, 1817) and A. rathbuni Vaughan, 1906. Astrangia woodsi Wells, 1955 is an incrusting coral with blue-gray polyps, and a darker skeleton originally described to the Eastern Coast of Australia. This species was for the rst time identi ed out of its natural border in 2021, on a rocky reef in the Arabian Sea. In the last decades, Indo-Paci c dendrophylliids belonging to the genus Tubastraea Lesson 1830 became widespread in the Atlantic. Indeed, two other exotic marine cnidarians have been recently introduced in the Tropical Atlantic, the octocorals Sarcothelia sp. Verrill, 1928 and Briareum hamrum (Gohar, 1948). Here, we describe a new Astrangia species to the Northeastern Brazilian coast. Scanning electron microscopy images of the corallites supported the taxonomic analysis and description of the new astrangiid. Early confounded with the A. woodsi, this new coral may be promptly recognized in biofouling because of its color and solitary development. Indeed, the incorporation of iron salts into the aragonite bers may result in blue carbonate skeletons-an exquisite condition observed in a small group of reef-building octocorals, the Helioporidae Moseley, 1876. Scleractinians have usually white aragonite skeletons. However, like the helioporids, Astrangia sp. nov. has also a blue skeleton, a natural camou age that is likely to prevent it to be noticed somewhere else. Finally, a key of the world Astrangia species is provided for the rst time.
Melanoides tuberculata (Müller, 1774) (Gastropoda: Thiaridae) is a freshwater gastropod native to... more Melanoides tuberculata (Müller, 1774) (Gastropoda: Thiaridae) is a freshwater gastropod native to Africa and Asia. It is a bioinvader of remarkable ecological capabilities presenting euryoic and highly adaptable to eutrophic conditions, M. tuberculata has also been found in estuarine environments. The first occurrence of the species in South America was reported from Brazil, in the late 60’s. The current literature documents a broader distribution of M. tuberculata in the rivers and reservoirs of the Brazilian north and northeast as well as in the Brazilian middle-west. The aim of this study is to analyze the salt tolerance of M. tuberculata, comparing the effects of salinity variation on adults and juveniles collected from a eutrophic lentic system in Bahia State (Brazil). Survival tests based on salinity exposure shows that the 50% survival salt concentration (salt LC50) for adults is 22.82‰ (CI= 20.46‰-25.19‰) and that the LC50 for juveniles was 21.56‰ (CI= 20.06‰-23.07‰). Activi...
Journal of Natural History, 2020
Scientia Marina, 2012
Members of the Cryptochiridae are small gall-crabs that live as obligate symbionts of scleractini... more Members of the Cryptochiridae are small gall-crabs that live as obligate symbionts of scleractinian corals. Only two species have so far been recorded in the western Atlantic Ocean. Herein a new Cryptochiridae genus and species is described, and new information is added on the life history of cryptochirids. The new genus is characterized by having the carapace with the lowest deflection angle among the genera, and also shows the following features: thoracic sternite 4 with setules and constriction smaller than half of the width of the basis, anterior margin curved with apical row of granules; third maxilliped with subcircular exopod reaching medially the lateral margin of the ischium; pereiopod 2 with prominent distomesial and anterolateral expansion on the merus, propodus almost twice larger than dactylus; thoracic sternite 7 with complete medial suture, female pleopod 3 uniramous with longitudinal opening. Male first pleopod straight with subdistal curvature of approximately 90°. Individuals belonging to the new genus are found in galls in massive corals although this structure is cited as being characteristic of ramified corals. The long plumose setae of the maxilliped 3 suggest a filter-feeding function, but the toothless chelae suggest that they are used to gather mucus.
Scientia Marina, 2009
the genus Madracis has been known in brazil from four deep water species, namely M. mirabilis, M.... more the genus Madracis has been known in brazil from four deep water species, namely M. mirabilis, M. asperula, M. brueggemanni, and M. pharensis, and one zooxanthellate species from shallow water environments, M. decactis. delicate fragments of a small branching colony of an undescribed Madracis were collected at 73 m depth, northern salvador (bahia state). although resembling the congeners M. asperula and M. brueggemanni, the new species has distinct features including reduced branch thickness, smaller diameter of corallite and columella structure and pattern of coenosteum ornamentation. because of the worldwide focus on reef-building corals, knowledge of azooxanthellate scleractinians remains scarce. in addition to contributing to the inventory of brazilian coral fauna, the occurrence of a new species of Madracis provides further evidence of the high diversity of deep-water coral communities in the tropical south atlantic.
Journal of Natural History
Zootaxa
Eriopisidae is a widespread amphipod family, whose members have subcylindrical bodies, often do n... more Eriopisidae is a widespread amphipod family, whose members have subcylindrical bodies, often do not have eyes, showing elongate third uropods in which the endopod is reduced and the exopod can become very long. This is the first record of Eriopisidae from Central America. Here, we describe the new genus and species Panamapisa guaymii gen. nov., sp. nov. from Bocas del Toro, Panama. The taxon differs from other members of the family in having a greatly enlarged merus on gnathopod 1, marginal setae on the dactyls of pereopod 5 to 7 and a third uropod nearly as long as the body.
Zootaxa
Cryptopontius is the most species-rich genus in the family Artotrogidae with 25 species, being re... more Cryptopontius is the most species-rich genus in the family Artotrogidae with 25 species, being recorded in almost all oceans, except in the Arctic. However only three species of this genus have been recorded from the Brazilian coast, all of them along the coast of Pernambuco state. This study describes two new species of the genus. Cryptopontius phyllogorgius sp. nov. differs from other species by having 9-segmented antennule, and nine elements on the third exopodal segment of leg 4. Cryptopontius pentadikos sp. nov. differs from its congeners by having five expressed antennulary segments proximal to fused ancestral IX-XII, two setae on second endopodal segment of leg 1, eight elements on third exopodal segment of leg 1 and the free segment of leg 5 with two setae. A key to species of the genus Cryptopontius is provided.
Zootaxa
A new monotypic superfamily, family, genus and species of Hadziida is described from the Brazilia... more A new monotypic superfamily, family, genus and species of Hadziida is described from the Brazilian continental shelf. Magnovioidea superfam. nov. Magnovidae fam. nov. and Magnovis gen. nov. are distinguished by the presence of: antenna 1 shorter than the peduncle of antenna 2; maxilliped outer plate falcate; palp, article 4 reduced and left and right mandibles with a well-developed molar that dominates the mandibular area. Eyes are absent. The type-species Magnovis elizabethae sp. nov. has strongly sexually dimorphic males in which gnathopod 2 is larger than gnathopod 1. Magnovidae fam. nov. occurs on the mid-continental shelf.
Zootaxa
Two new species of amphipods associated with the bioinvasive coral Tubastraea coccinea from Todos... more Two new species of amphipods associated with the bioinvasive coral Tubastraea coccinea from Todos-os-Santos Bay are described. The bioinvasive sun coral is known for competing with native coral species, which shelter a big diversity of associated fauna, especially amphipods. Leucothoe oxumae sp. nov. shows acute rostrum, antenna 1 about 1/4 of body length; gnathopod 1 carpochelate, propodus with 5 anterodistal robust setae; gnathopod 2 propodus fusiform, slightly serrated on palmar margin and posterodistal corner of epimeral plate 3 produced and rounded. Stenothoe ogumi sp. nov. is unique by showing a pronounced and developed maxilliped inner plate, gnathopod 2 propodus palm pointed with slightly undulated processes and two developed ones near hinge of dactylus and palmar margin beset with dense fringe of long setae. Updated taxonomic key to Leucothoe and Stenothoe species from Brazil are provided.
Zoosymposia
In Brazil, knowledge on copepods of the order Siphonostomatoida dates back to the late 1800s, wit... more In Brazil, knowledge on copepods of the order Siphonostomatoida dates back to the late 1800s, with the earliest record concerning parasitic copepods of fish. In contrast, the first record in Brazil of a copepod associated with an unknown marine invertebrate did not appear until 1988, with further studies on this copepod group occurring only during the last 15 years. The aim of this paper is to summarize the knowledge on the diversity of the siphonostome copepods, focusing on the associates of marine invertebrates, and to add new data on the distribution of known species and on the utilization of host species. Finally, an evaluation is carried out on the results and the effort expended during this period, and some objectives are proposed for improving the knowledge of the siphonostome copepods associated with marine invertebrates in Brazil.
Zoosymposia
Asterocheres Boeck, 1859 is the most speciose genus within the copepod family Asterocheridae Gies... more Asterocheres Boeck, 1859 is the most speciose genus within the copepod family Asterocheridae Giesbrecht, 1899. Its main hosts are sponges, cnidarians, bryozoans, and echinoderms. Among the latter there are records of Asterocheres associations with some species of the echinoid genus Eucidaris Pomel, 1883. Despite the wide distribution of Eucidaris tribuloides (Lamarck, 1883) in the coastal waters of Brazil, no records exist as yet of any copepod associated with this species. Asterocheres siphunculus sp. nov. is described herein based on samples collected from E. tribuloides sampled from two different sites off the coast of Salvador city, Bahia state, in northeastern Brazil. The new species shares a 20-segmented antennule with 20 congeners, but differs from them by having a very short siphon that reaches the insertion of the maxilla, a very wide rostrum that occupies the entire area between the antennules, and a pedigerous somite 4 with pointed and narrow posterolateral corners and a ...
Zoosymposia
The family Entomolepididae is represented in the South Atlantic Ocean solely by Spongiopsyllus, a... more The family Entomolepididae is represented in the South Atlantic Ocean solely by Spongiopsyllus, a monotypic genus found previously in association with sponges. A recent survey on the Boa Viagem Reefs, located off Salvador, Bahia State, on the northeastern region of Brazil, has revealed a new species of the genus, Spongiopsyllus redactus n. sp., found associated with the endemic scleractinian coral Mussismilia hispida (Verrill). The new species is distinguished from its congener, S. adventicius Johnsson, 2000, by differences in the number of segments of the antennule, the ornamentation of the distal endopodal segment of the antenna, and the setation of the maxilliped and P1. An updated key to the species of Entomolepididae is also provided.
Helgoland Marine Research
Predation is an interaction between species that influences community organisation by the direct ... more Predation is an interaction between species that influences community organisation by the direct consumption of prey, influencing prey numbers, behaviours and traits. The intensity of predation is greatly influenced by the environment, and the physical structure of habitats may influence predation intensity by providing refuge for prey or reducing the foraging efficiency of predators. In this context, the aim of the present study is to verify the influence of predation on the richness and density patterns of crustaceans inhabiting different species of Mussismilia corals, which provide various habitat structures for the associated fauna. We conducted an exclusion experiment to include total, partial and no cage treatments. The richness and density of crustaceans differed among coral species and cage treatments, except between partial cage and no cage treatment. Mussismilia harttii showed higher richness and density in uncaged and partial cage treatments compared with M. braziliensis, which in turn showed higher values than M. hispida. These findings indicate the importance of predation in the structure of crustacean assemblage associated with Mussismilia species and that differences in the richness and abundance of associated fauna result from the different habitat structures provided by each species of Mussismilia.
Zootaxa
The Family Entomolepididae is composed by 7 genera and 15 species. During a survey on the known s... more The Family Entomolepididae is composed by 7 genera and 15 species. During a survey on the known species and the search for new species, a new Spongiopsyllus is described associated with sponge Aplysina insularis. The new species has antennule 14-segmented, four setae on both lobes of maxillule, some unique features on the leg setation and the armature of the maxilliped. These characteristics make the new species different from all other congeners in Spongiopsyllus. The diagnosis of Entomopsyllus was also revised once it does not consider the differences to Spongiopsyllus which was created posteriorly to its erection. An analysis of Entomopsyllus stocki also indicated that leg 5 somite and the genital somite are fused, instead of separated as originally stated, the structure is also redescribed. Finally, Parmulodes verrucosus is studied and an up-to-date description is provided, correcting some inconsistencies in the armature formula of the antennule and the leg setation, and providi...
Zootaxa
Identification of scleractinian corals is traditionally based upon morphological analysis of skel... more Identification of scleractinian corals is traditionally based upon morphological analysis of skeleton traits. However, due to the influence of the environment on coral development, and the pattern highly variable of most diagnostical characters, additional information related to anatomy of soft parts, reproductive behavior and ecological interactions have been argued to support the distinction among similar morphotypes. Caribbean and South Atlantic Scolymia comprise a small group of solitary zooxanthellate corals: Scolymia lacera, S. cubensis and S. wellsii have been far subject of taxonomical misunderstandings. Aggressive interactions bewteen S. lacera and S. cubensis were useful to validate their specific status. Nevertheless, S. wellsii has been erroneously suggested to be synonym of S. cubensis. Following Laborel, Lang and Wells’ studies, we reinforce the individuality of the Atlantic Scolymia species, confirming the occurrence of S. cubensis to Brazil. Supporting newly-reported...
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Papers by Rodrigo Johnsson