scholarly journals Method of capture and population structure of Aegla georginae Santos and Jara, 2013 (Decapoda: Anomura: Aeglidae) in a tributary of the Ibicuí River in southern Brazil

2016 ◽  
Vol 76 (4) ◽  
pp. 1035-1042 ◽  
Author(s):  
C. E. Copatti ◽  
R. P. Legramanti ◽  
A. Trevisan ◽  
S. Santos
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
River Basin ◽  
Frequency Distribution ◽  
Relative Abundance ◽  
Carapace Length ◽  
Grouped Data ◽  
Southern Brazil ◽  
Size Classes ◽  
Males And Females

Abstract In the current study, we investigated population aspects of Aegla georginae in the Ibicuí River Basin by considering different capture methods and the implication of these data in the analysis of population dynamics. We sampled 1774 individuals: 1259 males (21 and 97 juveniles and 1029 and 113 adults in trap and handnet, respectively), 512 females (05 and 140 juveniles, 184 and 64 adults, and 81 and 38 ovigerous in trap and handnet, respectively) and 03 unsexed individuals (02 and 01 in trap and handnet, respectively). The frequency distribution in size classes shows a bimodal model for both sexes. The carapace length (CL) in males and females varied from 3.11 to 26.00 and 3.73 to 22.36 mm, respectively. Males presented significantly larger sizes than females. The relative abundance between males and females was significantly different from 1:1 with more males than females in most sampling periods (p < 0.05) when considering the grouped data (handnet + trap) and trap captures, but followed the expected ratio in most months when considering individuals sampled only with handnet (p > 0.05). Juveniles were recorded in all seasons, and reproduction occurs throughout the year. The population structure is similar to the model known for aeglids, and the capture methods affected the analysis of A. georginae, where the grouped data and trap captures presented greater abundance of individuals than handnet and males predominate in the larger size classes, and females in the intermediary size classes. Therefore, an integrated view of the capture methods is the best model for studying the population dynamics of aeglids.

scholarly journals Population dynamics of mantis shrimp Harpiosquilla harpax and Oratosquillina sp. in the waters south of Madura Island, Indonesia

2020 ◽  
Vol 21 (4) ◽  
Author(s):  
Yenni Arista ◽  
ZAIRION ◽  
YUSLI WARDIATNO
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
Life Span ◽  
Fishery Resource ◽  
Growth Coefficient ◽  
Mantis Shrimp ◽  
Exploitation Rate ◽  
L Value ◽  
Males And Females

Abstract. Ekalaturrahmah YAC, Zairon, Wardiatno Y. 2020. Population dynamics of mantis shrimp Harpiosquilla harpax and Oratosquillina sp. in the waters south of Madura Island, Indonesia. Biodiversitas 21: 1458-1466. Mantis shrimps are a potential fishery resource in Indonesia, but information about their population dynamics in the southern waters of Madura is limited. This study aimed to determine the population structure, growth, life span, and rate of exploitation for two taxa of mantis shrimp (Harpiosquilla harpax and Oratosquillina sp.). The research was conducted from September 2018 to February 2019 in the southern waters of Madura. The results showed that for H. harpax the majority of males caught ranged in length between 132.50 and 139.37 mm while the majority of females were between 153.45 and 160.22 mm. For Oratosquillina sp., the majority of males caught ranged from 84.70 and 89.60 mm while the majority of females were between 89.85 and 95.30 mm. The Growth Coefficient (K) for H. harpax was estimated to be 0.65 per year for males and 0.60 per year for females; while for Oratosquillina sp. the estimates were 0.81 and 0.78 per year, respectively. The L∞ value for H. harpax males was 183.00 mm and for females 250.55 mm, while the L∞ values for Oratosquillina sp. were 112.64 mm for males and 137.02 for females. The life span of H. harpax was estimated at 5 years, while for Oratosquillina sp. it was 4 years. The exploitation rate (E) for H. harpax males and females was 0.65 and 0.67 respectively, while for Oratosquillina sp. it was 0.54 and 0.58. These estimations indicated overexploitation of the resource, particularly in the case of H. harpax.

Population structure of Sinelobus cf. stanfordi (Crustacea, Tanaidacea) from Pinheiros River mangrove, Guaratuba Bay, southern Brazil

2016 ◽  
Vol 97 (2) ◽  
pp. 243-247
Author(s):  
A. D. Kassuga ◽  
A. Marafon-Almeida ◽  
S. Masunari
Keyword(s):  
Population Structure ◽  
Carapace Length ◽  
Reproductive Period ◽  
Southern Brazil ◽  
Ucides Cordatus ◽  
Temporal Fluctuations ◽  
Mangrove Crab ◽  
Sexually Mature

An analysis of the population structure of the tanaid Sinelobus cf. stanfordi was performed at Pinheiros River mangrove, Guaratuba Bay, Paraná State, southern Brazil (25°49′S 48°34′W). Fifteen samples of 12 × 12 cm were obtained bimonthly from the surface of galleries (interconnected burrow complex) constructed by the adult mangrove crab Ucides cordatus from June 2007 to April 2008. The carapace length (CL) of a total of 714 tanaids was measured. Tanaids were divided into four demographic categories: males (M), ovigerous females (OV), preparatory females (PREP) and non-reproductive individuals (NREP) with a mean CL of 0.55, 0.49, 0.48 and 0.43 mm, respectively. In the NREP group, specimens smaller than 0.32 mm were classified as juveniles. NREP predominated in all sampling months, and among sexually mature individuals, a strong predominance of females was observed throughout the study period. Temporal fluctuations in abundance were observed, with a peak in August 2007. The reproductive period of this species is continuous, with a peak in the summer, like most S. cf. stanfordi populations.

scholarly journals Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

2005 ◽  
Vol 48 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Glaucia Dalabona ◽  
Jayme de Loyola e Silva ◽  
Marcelo Antonio Amaro Pinheiro
Keyword(s):  
Sexual Dimorphism ◽  
Sexual Maturity ◽  
Carapace Length ◽  
Carapace Width ◽  
Southern Brazil ◽  
Monthly Basis ◽  
Ucides Cordatus ◽  
Size At Sexual Maturity ◽  
Males And Females ◽  
One Year

Morphometry and maturity of Ucides cordatus were analyzed with males and females collected during one year on a monthly basis at Laranjeiras Bay, Paraná State, Brazil. Carapace length, chelipeds propodus length and abdominal width were measured and related to carapace width to verify sexual dimorphism and size at morphological maturity of each sex. Carapace and propodus length of larger and smaller cheliped presented difference between sexes, confirming the use of both as secondary sexual characters. MATURE II program indicated 44mm and 43mm of carapace width to represent the size at sexual maturity of males and females, respectively.

scholarly journals POPULATION BIOLOGY OF SEABOB-SHRIMP Xiphopenaeus kroyeri (Heller, 1862) CAPTURED ON THE SOUTH COAST OF PERNAMBUCO STATE, NORTHEASTERN BRAZIL

2014 ◽  
Vol 62 (4) ◽  
pp. 331-340 ◽  
Author(s):  
Danilo Francisco Corrêa Lopes ◽  
Emanuell Felipe Beserra da Silva ◽  
Silvio Ricardo Maurano Peixoto ◽  
Flavia Lucena Frédou
Keyword(s):  
Population Dynamics ◽  
Population Biology ◽  
Carapace Length ◽  
Total Weight ◽  
South Coast ◽  
Northeastern Brazil ◽  
Southern Coast ◽  
Xiphopenaeus Kroyeri ◽  
Males And Females ◽  
The Relationship

This paper aims to describe the population dynamics and to evaluate the stock of the seabob-shrimp Xiphopenaeus kroyeri on the coast of Pernambuco. Sampling was carried out between August/2011 and July/2012 in Sirinhaém, southern coast of Pernambuco. A total of 1201 individuals were analyzed, 673 females and 528 males. Total length (Lt) of females varied from 4.5 to 13.5 cm while the Lt of males ranged between 4.0 and 11.0 cm. The relationship between the Lt and carapace length and Lt and total weight showed negative allometry (males, females and pooled sexes). The slope of the curve "b" was statistically different between males and females for both relationships. Females mature with 8.90 cm. Asymptotic length L∞ was lower for males than for females (12.26 to 14.79 and 10.72 to 11.5 cm, respectively), K was similar between sexes (1.00-2.04 and 1.00-2.63 cm/year-1 respectively) as well as the longevity and size at 1st capture (1.50 to 1.97) years and 7.9 to 8.9 cm for males and females, respectively). The results indicate that X. kroyeri in the region is not overexploited for males, however considering females and pooled sexes the stock is near to being fully exploited.

Life history of the spotted spiny lobster, Panulirus guttatus, an obligate reef-dweller

1997 ◽  
Vol 48 (8) ◽  
pp. 687 ◽  
Author(s):  
William C. Sharp ◽  
John H. Hunt ◽  
William G. Lyons
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
Carapace Length ◽  
Spiny Lobster ◽  
Minimum Size ◽  
Size At Maturity ◽  
Panulirus Guttatus ◽  
History Of ◽  
Males And Females ◽  
Initial Capture

Population dynamics of the spotted spiny lobster, Panulirus guttatus, were examined at Looe Key Reef, Florida, USA, from April 1987 to August 1989. The 347 lobsters captured (including recaptures), ranged from 9 mm (puerulus) to 75 mm carapace length (X = 54 mm CL). Pueruli settled all year round into small holes along the underside of the reef. All lobsters recaptured were found at the site of their initial capture; one was captured four times, all on the same reef spur, over 762 days. Adults sheltered within the reef during the day and foraged on top of the reef at night. Males and females were captured in equal proportions (1.2 M:1 F) from den entrances during the day; females were numerically dominant on foraging grounds at night (3 F:1 M). Reproduction occurred all year round but peaked between March and June; minimum size at maturity was 38 mm CL for females and 48 mm CL for males. The sheltering behaviour of P. guttatus, typically found on the ceiling of dens, contrasted markedly with that of the sympatric P. argus, typically found on the floor; both species used many of the same dens, but simultaneous co-occupancy was rare.

scholarly journals Reproductive strategies of a population of a freshwater amphipod (Crustacea, Amhipoda, Hyalellidae) from southern Brazil

2018 ◽  
Vol 18 (2) ◽  
Author(s):  
Daniela da Silva Castiglioni ◽  
Morgana Taís Streck ◽  
Stella Gomes Rodrigues ◽  
Alessandra Angélica de Padua Bueno
Keyword(s):  
Body Size ◽  
Reproductive Success ◽  
Reproductive Strategies ◽  
Reproductive Period ◽  
Lower Probability ◽  
Southern Brazil ◽  
Size Classes ◽  
Cephalothorax Length ◽  
Males And Females ◽  
The Mean

Abstract: The aim of this study was to characterize the reproductive strategies of a population of Hyalella bonariensis from southern Brazil. Pairing success, reproductive period of males and females, fecundity, and body size at the onset of reproduction were evaluated. Animals were sampled four times (August 2012, October 2012, January 2013, and April 2013) with the 250 µm-mesh dip net during 20 minutes by only one person. In the field, precopulatory pairs and ovigerous females were individualized. In the laboratory, cephalothorax length (CL) were measured and eggs and juveniles were removed from the females' marsupium and counted. The mean CL of paired males and females was significantly higher than that of non-paired males and females. A sexual dimorphism in body size was observed in the population - both paired and non-paired males were larger than females. Probably larger males have a higher probability of losing females during precopulatory behavior. A significant correlation was observed between the size of paired males and females - larger males often paired with larger females and smaller males paired with smaller females (r = 0.81). The pairing success of males increased with body size and we can assume that males from all size classes are able to find mates. The pairing success of females was independent of body size - paired and non-paired females had similar mean CL. The reproductive success increased with body size in males and females, and was more evident in males. Females from the largest size classes had null reproductive success. The idea that larger females can produce more eggs but might have a lower probability of finding a mate than smaller females was corroborated by our results. Therefore, smaller females have higher pairing success because they are capable of mating with a higher percentage of males. The estimated mean fecundity of H. bonariensis was 17.4 (± 3.89) eggs/juveniles. Our results are similar to those of other species of Hyalella from Brazil.

Population structure, fecundity and embryo loss of the sea grass shrimp Latreutes pymoeus (Decapoda: Hippolytidae) at Inhaca Island, Mozambique

2007 ◽  
Vol 87 (4) ◽  
pp. 879-884 ◽  
Author(s):  
Gil Penha-Lopes ◽  
Paulo Torres ◽  
Adriano Macia ◽  
José Paula
Keyword(s):  
Population Structure ◽  
Brood Size ◽  
Carapace Length ◽  
Grass Shrimp ◽  
Stage Iv ◽  
Development Stage ◽  
Size Class ◽  
Morphometric Measurements ◽  
Sea Grass ◽  
Males And Females

Latreutes pymoeus is a poorly studied tropical and sub-tropical shrimp species that mainly lives on sea grass beds. Samples were collected from sea grass beds of Inhaca Island, Mozambique, during August 2005 at neap/spring and low/high tides. Specimens were identified, sexed, counted and morphometric measurements were made. Ovigerous females were classified as small (carapace length (CL): 2.7–3.2 mm), medium (CL: 3.3–3.8 mm) and large (CL: 3.9–4.4 mm). Embryo masses were carefully removed from the pleopods with forceps, eggs staged and counted. On average, about 20% more males were found than females (0.64 ±0.25 and 0.56 ±0.28 ind m-2, respectively), but males were significantly smaller (2.25 ±0.32 and 2.60 ±0.47 mm CL for males and females, respectively). At 3.1 mm CL at least 50% of the females found carried embryos in the pleopods. Average (±SD) brood size increased significantly with female length (76 ±18, 133 ±64 and 205 ±61, for small, medium and large ovigerous females). The number of embryos decreased significantly over the incubation period for each size-class of the shrimp. Brood loss from embryonic Stage I to Stage IV for small, medium and large shrimp were 19.8%, 36.5% and 41.8%, respectively. Although an increase in brood loss was observed with increasing shrimp size, senescence did not seem to occur since larger shrimps carried a higher number of embryos and negative allometry was not recorded. Mean embryo volume, in the same development stage, was not significantly different among the small, medium and large shrimp, increasing significantly from 0.014 mm3 to 0.029 mm3 from the first to last embryonic stages.

scholarly journals Population structure and condition factor of Pseudotothyris obtusa (hypoptopomatinae) from three coastal streams in southern Brazil

1999 ◽  
Vol 42 (4) ◽  
Author(s):  
Denise de Freitas Takeuti ◽  
José Roberto Verani ◽  
José Marcelo Rocha Aranha ◽  
Márcia Santos de Menezes
Keyword(s):  
Young Adults ◽  
Population Structure ◽  
Sex Ratio ◽  
Condition Factor ◽  
Stream Fishes ◽  
Southern Brazil ◽  
Size Classes ◽  
Relative Condition Factor ◽  
Coastal Streams ◽  
Electric Fishing

Population structure features and condition factor of Pseudotothyris obtusa were compared between three coastal streams in southern Brazil. Fishes were monthly collected through electric fishing and measured in the total length. Fifteen fishes from each stream were dissected to identify their sex. The structure in size, sex ratio and young/adults ratio of populations were analysed and the length-weight relationship was obtained. The condition factor (K1) and the relative condition factor (Kn) were calculated for each stream. Fishes were grouped in 11 lenght classes of 3mm. The intermediate and bigger size classes were preponderant in the "Mergulhão" and "Colônia Pereira" streams, and the smaller and intermediate ones in the "Ribeirão" stream. Females prevailed in bigger size classes, reached bigger lengths than males, and were preponderant in all streams. The condition factors (K1 and Kn) were different in all streams, indicating better condition and higher weight values in fishes from the "Mergulhão" and "Colônia Pereira" streams.

scholarly journals Catchability of the southern rock lobster Jasus edwardsii. II. Effects of size

2002 ◽  
Vol 53 (8) ◽  
pp. 1149 ◽  
Author(s):  
P. E. Ziegler ◽  
C. R. Johnson ◽  
S. D. Frusher ◽  
C. Gardner
Keyword(s):  
Frequency Distribution ◽  
Rock Lobster ◽  
Size Frequency Distribution ◽  
Frequency Distributions ◽  
Size Classes ◽  
Size Frequency ◽  
Jasus Edwardsii ◽  
Behavioural Interactions ◽  
Males And Females ◽  
Relative Selectivity

For most of the year, the size-frequency distribution of trap-caught southern rock lobster, Jasus edwardsii, reflected size-specific catchability rather than the size-frequency distribution of the population in a scientific reserve in Tasmania, Australia. The size-frequency distributions of the population on the ground and of lobsters captured in traps were similar only during a few months, typically during moulting and mating. Small males and females were usually under-represented in traps. Catchability generally increased with size, but varied with sex and season. During moulting and mating, size-specific catchability and relative selectivity of larger animals were similar to or lower than for smaller animals. The relative pattern of catchability throughout the year was similar for most size classes within each sex. Negative associations between small and large lobsters in traps were stronger in winter than in summer, indicating strong behavioural interactions. These interactions could explain the lower catchability of smaller lobsters. Relative selectivity estimates using tag–recapture and size-specific catchability data provided generally similar results.

Ukuran Gejala Pusat Data Belum Dikelompokan(Kebakaran di Provinsi-Provinsi Tertentu di Indonesia Tahun 2015-2016)

2020 ◽  
Author(s):  
Riska Nurhapsari Santoso ◽  
Yudis Satrio Utomo ◽  
Yuliani Luturmasse
Keyword(s):  
Statistical Analysis ◽  
Frequency Distribution ◽  
Data Center ◽  
Grouped Data ◽  
Sample Data ◽  
Calculated Average

Abstract - Statistics is a framework of theories and methods that have been developed to collect, analyze, and write sample data in order to obtain useful conclusions. Statistics is the science of ways of collecting, classifying, analyzing, and searching for information related to the collection of data that investigations and conclusions based on evidence in the form of figures.Based on the results of the study can be concluded as follows: the size of the symptoms of the data center has not been grouped is the data compiled into the frequency distribution so that it does not have class intervals and midpoints of the class. Symptom Size Un-Grouped Data Center The size of the data center included in the statistical analysis is the calculated average (mean), median, mode, and fractil (quartile, decile, percentile)

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