scholarly journals Substrate use and selection in sympatric intertidal hermit crab species

2002 ◽  
Vol 62 (1) ◽  
pp. 107-112 ◽  
Author(s):  
A. TURRA ◽  
M. R. DENADAI
Keyword(s):  
High Tide ◽  
Single Species ◽  
Positive Influence ◽  
Substrate Preference ◽  
Hermit Crabs ◽  
Southeastern Brazil ◽  
Substrate Selection ◽  
Substrate Use ◽  
Competition For Space ◽  
Substrate Types

Coexisting hermit crabs may competitively interact for shells and microhabitats, mainly when shell availability is habitat-related. Three species of Clibanarius (C. antillensis, C. sclopetarius, and C. vittatus) coexist in the intertidal region of Pernambuco Islet, Araçá Region, São Sebastião Channel, southeastern Brazil. This study evaluated crab preferences for four substrate types used by these species in nature (rocky shore, pebbles, sand, and mud) in allopatric (single species) and sympatric (three species) treatments in simulations of high tide and low tide. The substrate preference of the three hermit crabs did not vary between low and high tide situations. At low tide the crabs either moved into holes in the highly complex rocky substrate or buried themselves in mud. Substrate selection may explain the patterns of substrate use in nature only for C. vittatus. Clibanarius antillensis and C. sclopetarius showed closer similarities in the pattern of substrate selection in the sympatric treatment with the substrate use in nature than in allopatric treatment, indicating a positive influence (dependence) of the presence of one species on the presence of another. Use of sub-optimal substrates, mainly by C. antillensis, may be caused by other factors such as its low desiccation tolerances. If competition for space takes place among these species, it would be more intense between C. sclopetarius and C. vittatus given their higher overlap in substrate preference than between them and C. antillensis.

scholarly journals Daily activity of four tropical intertidal hermit crabs from Southeastern Brazil

2003 ◽  
Vol 63 (3) ◽  
pp. 537-544 ◽  
Author(s):  
A. Turra ◽  
M. R. Denadai
Keyword(s):  
High Activity ◽  
Activity Pattern ◽  
Daily Activity ◽  
Activity Patterns ◽  
High Tide ◽  
Hermit Crabs ◽  
Activity Period ◽  
Southeastern Brazil ◽  
Intertidal Flat ◽  
Circadian Activity

This study describes the daily activity in a simulated high tide situation of four species of hermit crabs (Pagurus criniticornis, Clibanarius antillensis, C. sclopetarius, and C. vittatus) that coexist in an intertidal flat in southeastern Brazil. Observations were done in two-hour intervals during two subsequent days (48 h) in three replicate pools with thirty crabs each. Among species (between and within genera) there was an evident variation in activity patterns, of which three could be distinguished. The circadian activity patterns of C. antillensis and C. vittatus could be characterized as evening and nocturnal, with resting peaks during the morning and afternoon. The circadian activity pattern of C. sclopetarius was characterized by two marked peaks of inactivity, corresponding to dawn and evening, which could represent an intrinsic association with the semi-lunar tidal cycles of the study area. Pagurus criniticornis showed high activity not influenced by day/night conditions during the entire observed period. These activity pattern variations of the studied hermit crabs should be taken into account in designing further experiments. More precise and accurate interspecific behavioral comparisons among species could be achieved in nocturnal experiments, the high activity period of all species.

scholarly journals COMPETITION FOR SPACE BETWEEN FISHING AND EXPLORATORY OIL DRILLING, OBSERVED FROM A DRILLING PLATFORM IN THE ESPIRITO SANTO BASIN, SOUTHEASTERN BRAZIL

2015 ◽  
Vol 63 (1) ◽  
pp. 33-41 ◽  
Author(s):  
Alessandra Coutinho Thomé da Silva ◽  
Jean Louis Valentin ◽  
Marcelo Vianna
Keyword(s):  
Southeastern Brazil ◽  
Brazilian Coast ◽  
Factorial Correspondence Analysis ◽  
Artisanal Fishing ◽  
Oil Drilling ◽  
Espírito Santo ◽  
Fishing Vessels ◽  
Competition For Space ◽  
High Incidence ◽  
Espirito Santo

Fishing and oil drilling compete for space in some regions off the Brazilian coast. Fish congregate around drilling platforms, which attracts fishing vessels that may illegally breach the 500 m safety perimeter. The objective of this study was to identify the fleets that frequent the safety zone of a platform and their behavior and to determine if there was a seasonal relationship in this interaction, during two exploration campaigns, in different periods, carried out on the "Ocean Star" platform in the Espírito Santo Basin. The results indicated a high incidence of artisanal fishing vessels inside the prohibited area, and of uncooperative behavior on the part of the boat crews. The statistical method of Factorial Correspondence Analysis distinguished vessels that were using pelagic longlines to fish for dolphinfish, registered in the state of Espírito Santo and longer than 11 m, which operated during the summer campaign. Vessels fishing for scombrids, which were less than 11 m long and registered outside Espírito Santo, were prominent in the autumn-winter campaign. In conclusion, the data showed that the fleets involved in each exploratory campaign were different, but to determine the real reason why the boats insist on frequenting the area close to the platform further study is necessary.

scholarly journals Population biology and distribution of the tanaid Kalliapseudes schubarti Mañé-Garzon, 1949, in an intertidal flat in Southeastern Brazil

2003 ◽  
Vol 63 (3) ◽  
pp. 469-479 ◽  
Author(s):  
F. P. P. Leite ◽  
A. Turra ◽  
E. C. F. Souza
Keyword(s):  
Population Biology ◽  
Temporal Distribution ◽  
Sampling Period ◽  
Positive Influence ◽  
Southeastern Brazil ◽  
Life Strategy ◽  
Intertidal Flat ◽  
Sediment Layer ◽  
High Fecundity ◽  
Seasonal Oscillation

The population biology and the spatial and temporal distribution of Kalliapseudes schubarti Mañé-Garzon, 1949, a common tanaidacean in mud flats and estuaries in southern and southeastern Brazil, was studied in the Araçá region, São Sebastião (SP), Brazil. This species showed a clustered dispersion in the area and the individuals were concentrated in the superficial sediment layer (5 cm). Higher densities of K. schubarti were recorded in areas characterized by moderately sorted fine sediment. Multiple regression analysis revealed a positive influence of the organic matter contents and a negative effect of the silt-clay contents on the abundance of K. schubarti. This species showed a marked temporal variation with very low abundance in winter and fall (March to August). Sexual dimorphism was evidenced with males being larger than females. Ovigerous females were also larger than pre-ovigerous ones. Sex ratio was skewed towards females. Seven cohorts were identified during the sampling period, the estimated longevity was 12 months, and no seasonal oscillation in growth was evidenced. The continuous reproduction, as evidenced by the presence of larval phases (manca II and neutron) and reproductive females throughout the year, and high fecundity among the tanaids associated with fast growth and limited longevity support the case for the opportunistic life strategy suggested for this species in the literature.

scholarly journals Substrate selection and spatial segregation by two congeneric species ofEustala(Araneae: Araneidae) in southeastern Brazil

2015 ◽  
Vol 43 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Hebert da Silva Souza ◽  
Yuri Fanchini Messas ◽  
Marcelo de Oliveira Gonzaga ◽  
João Vasconcellos-Neto
Keyword(s):  
Spatial Segregation ◽  
Southeastern Brazil ◽  
Congeneric Species ◽  
Substrate Selection

Parasitization of the white spotwrist hermit crab, Pagurus criniticornis (Dana, 1852) (Decapoda, Anomura), by the rhizocephalan barnacle Peltogasterella socialis (Müller, 1863) (Cirripedia, Rhizocephala) from southeastern Brazil

2007 ◽  
Vol 57 (3) ◽  
pp. 315-327 ◽  
Author(s):  
Fabíola Faria ◽  
Christopher Boyko ◽  
Fernando Mantelatto
Keyword(s):  
Size Distribution ◽  
Hermit Crab ◽  
Host Species ◽  
First Record ◽  
Species Description ◽  
Hermit Crabs ◽  
Southeastern Brazil ◽  
South American ◽  
The Bahamas ◽  
Sandy Area

AbstractHermit crabs of the species Pagurus criniticornis (Dana, 1852) parasitized by the poorly known colonial rhizocephalan Peltogasterella socialis (Müller, 1863), were collected in the infralittoral rocky/sandy area of Anchieta Island (São Paulo), Brazil. We report the presence and pattern of occurrence of this rhizocephalan in the P. criniticornis population. The hermit crabs were obtained monthly during 1999 by two people using SCUBA methods. A total of 992 hermit crabs were captured and examined for rhizocephalans. The studied population showed non-normal size distribution and only 2.11% of the sample specimens carried externae of P. socialis. The parasite occurrence was seasonal and varied with host size. Some signs of feminization were observed on P. criniticornis pleopods (elongation of the endopod and reduction of the exopod of pleopods for males and reduction in the size of endopods for females). This is the first report on this parasite/host relationship for this South American host species. This is the first record of P. socialis (Müller, 1863) subsequent to the species' description, and possible occurrence of the parasite on hermit crabs in the Bahamas is also reported.

scholarly journals Bird frugivory and seed germination of Myrsine umbellata and Myrsine lancifolia (Myrsinaceae) seeds in a cerrado fragment in southeastern Brazil

2011 ◽  
Vol 11 (4) ◽  
pp. 59-65 ◽  
Author(s):  
Rafael Soave Guerta ◽  
Lucas Gustavo Lucon ◽  
José Carlos Motta-Junior ◽  
Luís Augusto da Silva Vasconcellos ◽  
Rodolfo Antônio de Figueiredo
Keyword(s):  
Seed Germination ◽  
Digestive Tract ◽  
Germination Percentage ◽  
Positive Influence ◽  
Food Sources ◽  
Southeastern Brazil ◽  
Important Food

Birds are known to be important dispersers of plants, since the passage of seeds through the digestive tract often has a positive influence on germination percentage and speed. In this study, proportions of germination in different substrates were compared between Myrsine (Myrsinaceae) seeds collected manually and those ingested by birds. The guilds of birds that fed on M. umbellata and M. lancifolia were identified and comprise 24 and 12 species, respectively. A higher germination proportion was found among seeds defecated by birds and sowed in the study area. The study also found differences between the guilds of frugivores in both synchronopatric species. Therefore, we suggest that M. umbellata and M. lancifolia are important food sources by birds that play a positive influence for enhance germination of Myrsine.

scholarly journals Oviposition Substrate Selection, Egg Mass Characteristics, Host Preference, and Life History of the Spotted Lanternfly (Hemiptera: Fulgoridae) in North America

2019 ◽  
Author(s):  
Houping Liu
Keyword(s):  
Host Preference ◽  
Fourth Instar ◽  
Egg Mass ◽  
Black Cherry ◽  
Substrate Selection ◽  
Egg Masses ◽  
Tree Of Heaven ◽  
History Of ◽  
Oviposition Substrate ◽  
Substrate Types

Abstract Oviposition substrate selection, egg mass characteristics, host preference, and life history of Lycorma delicatula (White) (Hemiptera: Fulgoridae) were studied in Pennsylvania between 2016 and 2017. Twenty-four substrate types (trees, shrubs, and nonliving materials) were selected by females for oviposition. Tree-of-heaven, black cherry, black birch, and sweet cherry were favored at 62.5% of the types and accounted for 68.5% of the egg masses based on survey results 200 cm above ground. Egg mass density ranged between 0.2 and 75.2 egg masses/m2 with no significant difference among substrate types. Egg mass size ranged between 0 and 192 eggs/egg mass, with 91.8% containing <50 eggs. Significantly larger egg masses were found on sweet and black cherry compared with tree-of-heaven, with significantly higher hatch success on black locust. Eggs hatched between May 2 and June 5 and peaked on 18 May 2017. Tree-of-heaven and summer grape were preferred by nymphs and adults, while multiflora rose and black walnut were favored by the first, second, and the fourth instar nymphs, respectively. The first, second, third, fourth instars and adults lasted for 62 (2 May–3 July), 42 (8 June–20 July), 35 (26 June—31 July), 39 (10 July—18 Aug.), and 114 (24 July—15 Nov.) days, with peaks on 25 May, 22 June, 6 July, 31 July, and 22 Aug., respectively. Adult feed for 2 months before laying eggs in early October. Cumulative degree-days were 0–325, 153–652, 340–881, 567–1,020, 738–1,227, and 942–1,795 for the egg, first, second, third, fourth instar, and adult stage, respectively. Oviposition strategies and development patterns were discussed.

scholarly journals Both Intrinsic Substrate Preference and Network Context Contribute to Substrate Selection of Classical Tyrosine Phosphatases

2017 ◽  
Vol 292 (12) ◽  
pp. 4942-4952 ◽  
Author(s):  
Anita Palma ◽  
Michele Tinti ◽  
Serena Paoluzi ◽  
Elena Santonico ◽  
Bernd Willem Brandt ◽  
...  
Keyword(s):  
Substrate Preference ◽  
Substrate Selection ◽  
Tyrosine Phosphatases ◽  
Selection Of

scholarly journals Diel density variation of amphipods associated with Sargassum beds from two shores of Ubatuba, Southeastern, Brazil

2007 ◽  
Vol 97 (4) ◽  
pp. 400-405 ◽  
Author(s):  
Fosca P. P. Leite ◽  
Marcel O. Tanaka ◽  
Daniela B. Sudatti ◽  
Raquel S. Gebara
Keyword(s):  
High Tide ◽  
Density Variation ◽  
Southeastern Brazil ◽  
Diel Variation ◽  
Water Turbidity ◽  
Turbid Waters ◽  
Density Peaks ◽  
Epifaunal Assemblages ◽  
The Times ◽  
Amphipod Density

Densities of mobile epifaunal assemblages associated with macrophytes are very variable during the day and the activity of visually-oriented predators is thought to have an important influence on this pattern. Here we compared densities of amphipods associated with a common brown alga, Sargassum stenophyllum (Phaeophyceae), at sites contrasting in water turbidity. We expected that diel variation of amphipods would occur in a shore with clear waters (Perequê), whereas no variation was expected in a shore with turbid waters (Lamberto). Amphipod density varied during the day at both shores, with no indication of a larger variation at Perequê. Most species showed two density peaks, one at night and the other in the afternoon. These peaks occurred close the times of high tide, suggesting that tidal rhythms could influence more amphipod densities than the activity of predators. Thus, more studies are necessary to understand factors that influence short-term variation of epifaunal assemblages.

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