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7 results on '"Papa, Rey Donne S."'

1. Temperature as main driver of the growth of an endemic Philippine freshwater copepod (Copepoda: Calanoida: Diaptomidae).

Author

Leon, Justine R de, Tordesillas, Dino T, Souissi, Sami, Cuadrasal, Grei Angelo, Guinto, Shea Kathleen P, Rizo, Eric Zeus C, and Papa, Rey Donne S

Subjects
COPEPODA, CALANOIDA, FRESH water, WATER quality, WATER depth, FRESHWATER zooplankton
Abstract

We conducted a preliminary analysis on the effects of various physical and chemical parameters on the morphometry and reproductive capacity of the calanoid copepod Filipinodiaptomus insulanus (Wright, 1928), endemic to the Philippines, by proxying clutch size (CS). Specimens and water quality readings were obtained between October 2019 and February 2020 from four sites in northern Philippines. Only the sizes of adult males and non-ovigerous adult females showed significant differences (P < 0.05) among populations. Non-eutrophic, temporary shallow waters were the predominant habitat type of F. insulanus , corroborating earlier observations that it is mainly found in relatively pristine environments. Correlation analysis showed a significant indirect relationship (P < 0.001) between the size of individuals and temperature, a potential adaptive response to its environment. Such observations may be valuable in preventing the disappearance of this species from parts of its previously known range. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Geography, ecology, and history synergistically shape across-range genetic variation in a calanoid copepod endemic to the north-eastern Oriental.

Author

Zhang, Xiaoli, Huang, Qi, Liu, Ping, Sun, Chenghe, Papa, Rey Donne S, Sanoamuang, Laorsri, Dumont, Henri J, and Han, Bo-Ping

Subjects
GENETIC variation, PHYLOGEOGRAPHY, LAST Glacial Maximum, POPULATION differentiation, CLIMATE change, GEOGRAPHY
Abstract

The center-periphery hypothesis (CPH) predicts that peripheral populations will have lower genetic variation than those at the center of a species' distribution. However, ecological margins do not always coincide with geographical edges when topographies are diverse. Historical climate changes can also strongly affect genetic variation. Here, we examined genetic variation in Phyllodiaptomus tunguidus , a calanoid copepod endemic to the north-eastern Oriental. This species was predicted to exhibit a complex pattern of genetic variation across its range due to the diverse topographies and stable climate history of the north-eastern Oriental. To test this, we used geographic distance to the center of the distribution, current ecological suitability, and climate during the last glacial maximum as geographical, ecological, and historical factors, respectively, in our analyses. We measured genetic diversity and population differentiation using mitochondrial and nuclear markers. This showed that P. tunguidus had 3 refugia during the last glacial maximum (LGM). Such a pattern of multiple refugia complicates the determination of the center and periphery of spatial genetic diversity. Both regression models and redundancy analyses failed to support the CPH. Instead, they showed that geographical, ecological, and historical factors together shaped population genetic structure in this species. Ecological factors explained significantly more genetic variation than did geographical and historical factors—however, all three factors interacted significantly to affect the pattern of genetic variation. The results extend our understanding of the CPH and the extent to which it can explain genetic variation across populations. [ABSTRACT FROM AUTHOR]

Published
2023
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3. Philippine Seven Tropical Maar Lakes are Ideal Habitats for the Invasive Arctodiaptomus dorsalis Marsh, 1907 (Copepoda: Calanoida).

Author

de Leon, Justine R., Tordesillas, Dino T., Biag, Irian J. L., Cusi, Sean H. L., Tan, John A. B., Mijares, Edna Marie, Aguilar, Jaydan I., and Papa, Rey Donne S.

Subjects
ORIENTAL fruit fly, COPEPODA, WATER quality, LAKE management, CALANOIDA, LAKES, MARSHES
Abstract

The presence of the invasive calanoid copepod Arctodiaptomus dorsalis in Philippine inland waters has been reported in numerous studies. Attempts to understand how it effectively proliferated in the country's freshwaters have shown its preference towards shallow and productive waters - a feature shared by most lakes in the Philippines. In this study, we compared the body size and reproductive capacity - proxied by clutch size (CS) - of ovigerous female A. dorsalis obtained from established populations in the seven maar lakes (SML) of San Pablo, Laguna, Philippines. These measurements were also correlated with selected water quality parameters. Collection of ovigerous A. dorsalis and water quality parameters were conducted on a 3-mo sampling period during the southwest monsoon season in 2016. Statistical analysis shows that there exists a significant difference between the prosome length (PL) and CS of A. dorsalis from the seven lakes (p < 0.001), with the shallowest and most productive lake containing the most fecund population. Additionally, all water quality parameters showed a positive correlation with the PL and CS of ovigerous A. dorsalis from the SML (p < 0.01). This shows that the SML provides favorable conditions for the propagation of A. dorsalis, making it a model for in situ investigation of this invasive species' ecology; the first step in incorporating zooplankton ecology as a tool for the development of lake management systems. [ABSTRACT FROM AUTHOR]

Published
2022

4. Arctodiaptomus dorsalis

Author

Dela Paz, Erica Silk P., Lopez, Mark Louie D., David, Christian Irvin Harvey A., Dela Cruz, Dave Ryan A., Viernes, Gian Alfonso A., Wong, Jac Fritgerald, and Papa, Rey Donne S.

Subjects
Diaptomidae, Arthropoda, Arctodiaptomus dorsalis, Hexanauplia, Arctodiaptomus, Animalia, Biodiversity, Calanoida, Taxonomy
Abstract

Arctodiaptomus dorsalis (Marsh, 1907) Materials examined. Philippines: Luzon: Manila: Pasig River (14.5604° N, 121.0659° E), coll. DRA Dela Cruz, GAA Viernes, JF Wong, ESP Dela Paz and ML Lopez, June 2016 (UST-ZRC 0253A–B, USTZRC 0254, USTZRC 0255A–B, and USTZRC 0256A–B, 4 spec.). Short description. The body is generally elongated with a long antennule that generally reaches the tip of the urosome. Male specimen: antennule is geniculated. Right exopodite 2 of P5 leg is relatively large and bears a long, thin, and strongly curved terminal claw on the posteromedian area; and with a short lateral spine protruding near the middle of exopodite 2. Female specimen: antennule is straight. The pair of P5 is symmetrical. All the morphological characteristics concur with the descriptions and illustrations of Dussart and Defaye (2001) and Papa et al. (2012). Ecological distribution. Arctodiaptomus dorsalis is found in lakes and rivers. This species is an invasive copepod hence that can tolerate eutrophic condition (Papa et al. 2012)., Published as part of Dela Paz, Erica Silk P., Lopez, Mark Louie D., David, Christian Irvin Harvey A., Dela Cruz, Dave Ryan A., Viernes, Gian Alfonso A., Wong, Jac Fritgerald & Papa, Rey Donne S., 2018, Freshwater microcrustaceans (Cladocera: Anomopoda and Ctenopoda, Copepoda: Cyclopoida and Calanoida) in the highly urbanized Metropolitan Manila area (Luzon, Philippines), pp. 751-762 in Check List 14 (5) on page 757, DOI: 10.15560/14.5.751, {"references":["Dussart BH, Defaye D (2001) Introduction to the Copepoda. 2 nd edition. Guide to the Identification of the Microinvertebrates of the Continental Waters of the World, No. 16. Backhuys Publishers, Leiden. 344 pp.","Papa RDS, Li H, Tordesillas DT, Han B, Dumont HJ (2012) Massive Invasion of Arctodiaptomus dorsalis (Copepoda, Calanoida, Diaptomidae) in Philippine lakes; a threat to Asian zooplankton biodiversity? Biological Invasions 14 (12): 2471 - 2478. http: // doi. org / 10.1007 / s 10530 - 012 - 0250 - 9"]}

Published
2018
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5. Annot ated checklist and insular distribution of f reshwater microcrustaceans (Copepoda: Calanoida & Cyclopoida; Cladocera: Anomopoda & Ctenopoda) in the Philippines

Author

Lopez, Mark Louie D., Pascual, Jhaydee Ann F., Dela Paz, Erica Silk P., Rizo, Eric Zeus C., Tordesillas, Dino T., Guinto, Shea Kathleen, Han, Boping, Dumont, Henri J., Mamaril, Augustus C., and Papa, Rey Donne S.

Subjects
Branchiopoda, Arthropoda, Moinidae, Hexanauplia, Biodiversity, Cyclopoida, Anomopoda, Cyclopidae, Ilyocryptidae, Pseudodiaptomidae, Animalia, Chydoridae, Maxillopoda, Daphniidae, Calanoida, Diplostraca, Macrothrichidae, Taxonomy
Abstract

Lopez, Mark Louie D., Pascual, Jhaydee Ann F., Dela Paz, Erica Silk P., Rizo, Eric Zeus C., Tordesillas, Dino T., Guinto, Shea Kathleen, Han, Boping, Dumont, Henri J., Mamaril, Augustus C., Sr, Papa, Rey Donne S. (2017): Annot ated checklist and insular distribution of f reshwater microcrustaceans (Copepoda: Calanoida & Cyclopoida; Cladocera: Anomopoda & Ctenopoda) in the Philippines. Raffles Bulletin of Zoology 65: 623-654, DOI: http://doi.org/10.5281/zenodo.5358372, {"references": ["Adamczuk M (2014) Niche separation by littoral-benthic Chydoridae (Cladocera, Crustacea) in a deep lake - potential drivers of their distribution and role in littoral pelagic coupling. Journal of Limnology, 73: 490-501.", "Alekseev VR & Sanoamuang LO (2006) Biodiversity of cyclopoid copepods in Thailand - with description of Afrocyclops henrii sp.n. Arthropoda Selecta, 15: 227-290.", "Alonso M (1996) Crustacea, Branchiopoda. 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Published
2017
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6. Diversity and distribution of copepods (Class: Maxillopoda, Subclass: Copepoda) in groundwater habitats across South-East Asia.

Author

Lopez, Mark Louie D. and Papa, Rey Donne S.

Abstract

Copepods have successfully penetrated the groundwater realm through a series of morphological diversifications and adaptations. Research on this taxon has increased over the past decade because of its potential in revealing the status of groundwater environmental health and biodiversity. Despite efforts in documenting this group in other regions, groundwater copepods in South-East Asia remain barely studied. To date, only 47 species belonging to 22 genera from Harpacticoida, Cyclopoida and Calanoida have been documented from groundwater and groundwater-dependent habitats across the region. The steep species accumulation curve from 1980 up to the present indicates a high possibility of discovering more new species. Spatial distribution shows high local endemicity than regional scales, where some species considered to be rare and endemic were actually common in local habitats. Overall, the low number of records in the region is because of the lack of experts and limited accessibility to groundwater and dependent ecosystems, like aquifers and groundwater wells. A more intensive effort in documenting the diversity and distribution of groundwater copepods and building collaborations between experts in the region is highly needed. This information is important in drafting future conservation and management policies for the groundwater resources in the region. This paper focuses on taxonomy and habitat distribution of groundwater copepods in South-east Asia. We list 48 species from 22 genera documented from groundwater and groundwater-dependent habitats across the region that exhibit higher local endemicity compared to regional scale. A high number of species can still be discovered if more intensive sampling efforts and collaborative work are undertaken in the future. [ABSTRACT FROM AUTHOR]

Published
2020
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7. Cumulative reproduction model to quantify the production of the invasive species Arctodiaptomus dorsalis (Calanoida, Copepoda).

Author

Takahashi, Amane, Ban, Syuhei, Papa, Rey Donne S., Tordesillas, Dino T., and Dur, Gaël

Subjects
*SEXUAL cycle, *CALANOIDA, *ANIMAL clutches, *REPRODUCTION, *COPEPODA, *INTRODUCED species, *AGRICULTURAL egg production
Abstract

• Individual-based model to study the production of an invasive copepod. • Model integrates the effect of food concentration on several individual endpoints. • Calibration of the model benefits from measures obtained in vivo. • Quantify the combined impact of food and predation on egg and offspring production. Arctodiaptomus dorsalis is an invasive calanoid copepod originally from America and has recently established a population in Lake Taal in the Philippines. It has been proposed that eutrophication due to aquaculture contributes to the establishment and success of this species. This study aimed to clarify this hypothesis by quantifying the effect of increasing food concentration on the reproduction of A. dorsalis using an Individual-Based Model. We parameterized food concentration-dependent equations to simulate the effect of different food concentration on the reproductive traits (latency time, embryonic development time, clutch size, and hatching success) of this species using data from the literature and simulated the reproduction of 1000 independent females for 20 days at different food concentration, taking into account the variability among individuals. The simulation results showed that the cumulative production of eggs and offspring increased continuously with time when the food concentration was above 3.2 × 104 cells mL−1, suggesting that this value was the threshold concentration required for stable reproduction of A. dorsalis. This value is not particularly low compared to other copepods. Hence, our result revealed that the food use efficiency of A. dorsalis is not particularly outstanding and urge the need of a comparison with native species to confirm a possible superiority. We suggest that A. dorsalis has filled the ecological niche left vacant by the disappearance of the original species due to the deterioration of water quality caused by the eutrophication of the lake. The reproductive cycle model developed in this study constitutes a necessary step in the development of a complete population dynamics model, which can help clarify the invasive abilities of A. dorsalis. [Display omitted] [ABSTRACT FROM AUTHOR]

Published
2023
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