scholarly journals Do syntopic host species harbour similar symbiotic communities? The case ofChaetopterusspp. (Annelida: Chaetopteridae)

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e2930 ◽  
Author(s):  
Temir A. Britayev ◽  
Elena Mekhova ◽  
Yury Deart ◽  
Daniel Martin
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
Host Species ◽  
Interspecific Interactions ◽  
Single Species ◽  
Intraspecific Interactions ◽  
Mean Intensity ◽  
Species Dominance ◽  
High Species Richness ◽  
Symbiotic Community

To assess whether closely related host species harbour similar symbiotic communities, we studied two polychaetes,Chaetopterussp. (n = 11) andChaetopteruscf.appendiculatus(n = 83) living in soft sediments of Nhatrang Bay (South China Sea, Vietnam). The former harboured the porcellanid crabsPolyonyxcf.heokandPolyonyxsp., the pinnotherid crabTetriassp. and the tergipedid nudibranchPhestillasp. The latter harboured the polynoid polychaeteOphthalmonoe pettiboneae, the carapid fishOnuxodon fowleriand the porcellanid crabEulenaios cometes, all of which, exceptO. fowleri, seemed to be specialized symbionts. The species richness and mean intensity of the symbionts were higher inChaetopterussp. than inC.cf.appendiculatus(1.8 and 1.02 species and 3.0 and 1.05 individuals per host respectively). We suggest that the lower density ofChaetopterussp. may explain the higher number of associated symbionts observed, as well as the 100% prevalence (69.5% inC.cf.appenciculatus). MostChaetopterussp. harboured two symbiotic species, which was extremely rare inC.cf.appendiculatus, suggesting lower interspecific interactions in the former. The crab and nudibranch symbionts ofChaetopterussp. often shared a host and lived in pairs, thus partitioning resources. This led to the species coexisting in the tubes ofChaetopterussp., establishing a tightly packed community, indicating high species richness and mean intensity, together with a low species dominance. In contrast, the aggressive, strictly territorial species associated withC.cf.appendiculatusestablished a symbiotic community strongly dominated by single species and, thus, low species richness and mean intensity. Therefore, we suggest that interspecific interactions are determining species richness, intensity and dominance, while intraspecific interactions are influencing only intensity and abundance. It is possible that species composition may have influenced the differences in community structure observed. We hypothesize that both host species could originally be allopatric. The evolutionary specialization of the symbiotic communities would occur in separated geographical areas, while the posterior disappearance of the existing geographical barriers would lead to the overlapped distribution.

Habitat use and coexistence of three territorial herbivorous damselfish on different-size patch reefs

2013 ◽  
Vol 93 (8) ◽  
pp. 2265-2272 ◽  
Author(s):  
Akihisa Hattori ◽  
Takuro Shibuno
Keyword(s):  
Species Richness ◽  
Habitat Use ◽  
Interspecific Interactions ◽  
Patch Reef ◽  
Back Reef ◽  
Intraspecific Interactions ◽  
Reef Area ◽  
Patch Reefs ◽  
Significant Difference ◽  
Random Placement

In local reef fish communities, species richness increases with increasing reef area. At Ishigaki Island, Japan, species richness is much lower on large reefs in the shallow back reef than that expected from random placement model simulations (RPMS). As three aggressive territorial herbivorous damselfish, Stegastes nigricans, Stegastes lividus and Hemiglyphidodon plagiometopon, coexist only on such large reefs, we focused on these species and examined patterns of their distribution and abundance on 84 patch reefs of various sizes (area and height). We also examined their aggressive intra- and interspecific behavioural interactions and habitat use on the two large reefs (the largest complex patch reef and the large flat patch reef) among the 84 patch reefs. While the abundance of both S. lividus and H. plagiometopon was highly correlated with patch reef area, that of S. nigricans was closely correlated with patch reef height. For S. nigricans and S. lividus, interspecific interactions occurred significantly more frequently than intraspecific interactions on the large flat patch reef. However, there was no significant difference in frequencies of the two interaction types on the largest complex patch reef, where they three-dimensionally segregated conspecific territories. This study suggested that reef height as well as reef area influence the distribution and abundance of these territorial herbivorous damselfish in the shallow back reef. As large patch reefs cannot be tall allometrically in shallow back reefs, relatively flat patch reefs may not have the high species richness expected from RPMS based on reef area.

scholarly journals Floristic Inventory of The Proposed Site for Tarsier Tourism Center in Villa Aurora, Bilar, Bohol, Philippines

2016 ◽  
Vol 9 (2) ◽  
pp. 67 ◽  
Author(s):  
Tomas D Reyes Jr ◽  
Jeralyn D Abadingo ◽  
Shiela G Tabuno ◽  
Eunice K L Serino ◽  
Joecel B Mabanag ◽  
...  
Keyword(s):  
Species Richness ◽  
Ground Vegetation ◽  
Primate Conservation ◽  
Vegetation Composition ◽  
Species Dominance ◽  
Floristic Inventory ◽  
Large Trees ◽  
High Species Richness ◽  
Very High ◽  
Understorey Plant

The study assessed the present vegetation composition of the Proposed Site for the Tarsier Tourism Center (PTTC) at Villa Aurora, Bilar, Bohol and performed a comparative analysis with the existing Tarsier Sanctuary (TS) at Canapnapan, Corella, Bohol. The basis for comparison was the computed importance values, species richness, species dominance, and percent distribution of plants according to self-defined DBH classes. Results showed that both sites had very high species richness and evenness values. Common overstorey and understorey plant species found in both areas were katagpo (Psychotria sp.), sagimsim (Syzygium brevistylum [C. B. Rob]Merr.) and bagauak (Clerodendrum minahassae Teijsm. & Binn.). Apart from sagimsim (Syzygium brevistylum [C.B.Rob.] Merr.), selaginella (Selaginella cuppresina Lin.), and lunas (Lunasia amara Blanco) were also common in the ground vegetation of both areas. Percent distribution of trees according to self-defined DBH classes revealed that PTTC had 87.55% of the total recorded plants with DBH measurements of <10 cm. Our data was found lower by almost 10% from TS. Considerable percentages of trees were also shared in other DBH classes for PTTC. DBH class range of 10-20 cm had 6.88%, while 5.58% was computed for DBH class of >20 cm. Percent distribution of trees on these DBH ranges (especially on DBH class >20 cm) indicated the presence of medium and large trees. The largest DBH measured in the PTTC was 70 cm while in TS was only 22 cm. The proposed 10-ha site in Villa Aurora, Bilar, is suited to be utilized as Tarsier Tourism Center. In case the proposed project is to be pursued, enclosure similar to what has been constructed in Canapnapan, Corella, Bohol, Philippines should also be established to prevent stray animals from predating the captive tarsiers.Keywords: floristic inventory, Philippine tarsier, Bohol, primate conservation, tourism. Inventarisasi flora dari Situs Usulan untuk Sentra Wisata Tarsier di Villa Aurora, Bilar, Bohol, FilipinaAbstractPenelitian ini ditujukan untuk melakukan penilaian komposisi vegetasi dari Usulan Lokasi Pusat Wisata Tarsius (ULPWT) di Villa Aurora, Bilar, Bohol dan melakukan analisis perbandingan antara Tarsier Sanctuary (TS) yang ada di Canapnapan, Corella, Bohol. Dasar perbandingan yang digunakan yaitu dengan menghitung nilai penting, kekayaan spesies, dominansi spesies, dan prosentase distribusi dari tumbuhan berdasarkan kelas diameter yang telah ditentukan. Hasil penelitian menunjukkan bahwa kedua tempat memiliki kekayaan spesies dan nilai evenness/ kemerataan yang sangat tinggi. Spesies tumbuhan yang umum ditemukan di overstorey dan understorey di kedua area adalah katagpo (Psychotria sp.), sagimsim (Syzygium brevistylum [C. B. Rob]Merr.), dan bagauak (Clerodendrum minahassae Teijsm. & Binn.). Selain itu, sagimsim (Syzygium brevistylum [C.B.Rob.] Merr.), selaginella (Selaginella cuppresina Lin.), dan lunas (Lunasia amara Blanco) juga umum ditemukan di lantai hutan di kedua tempat. Prosentase distribusi dari tumbuhan berdasarkan kelas diameter yang telah ditentukan menunjukkan bahwa ULPWT memiliki 87.55% dari keseluruhan tumbuhan yang tercatat dengan ukuran diameter <10 cm. Data kami menunjukkan bahwa nilai tersebut lebih rendah 10% dari TS. Sebagian persentase dari pohon juga dimiliki di ULPWT pada kelas diameter lainnya. Kelas diameter 10-20 cm memiliki 6,88%, sementara 5,58% terhitung untuk kelas diameter >20 cm. Prosentase distribusi dari pohon pada kisaran ini (khususnya pada diameter >20 cm) menunjukkan adanya kehadiran pohon berukuran medium dan besar. Diameter terbesar yang terukur di ULPWT adalah 70 cm sementara di TS hanya sebesar 22 cm. Lokasi seluas 10 ha di Villa Aurora, Bilar, sesuai untuk digunakan sebagai Pusat Wisata Tarsius. Apabila akan didirikan, maka kandang yang dibangun diharapkan mirip dengan yang telah dibangun di Canapnapan, Corella, Bohol, Pilipina, agar mencegah pemangsaan oleh satwa yang lepas. 

scholarly journals Species-area relationships emerge from multiple coexistence mechanisms

2021 ◽  
Author(s):  
David Garcia-Callejas ◽  
Ignasi Bartomeus ◽  
Oscar Godoy
Keyword(s):  
Species Richness ◽  
Spatial Heterogeneity ◽  
Species Interactions ◽  
Spatial Scales ◽  
Single Species ◽  
Small Population ◽  
Collective Effects ◽  
Demographic Stochasticity ◽  
Species Dominance ◽  
Species Area

The increase of species richness with area is a universal phenomenon on Earth. However, this observation contrasts with our poor understanding of how these species-area relationships (SARs) emerge from the collective effects of area, spatial heterogeneity, and local interactions. By combining a structuralist approach with five years of empirical observations in a highly-diverse grassland, we show that,contrary to expectations, spatial heterogeneity plays a little role in the accumulation of species richness with area in our system. Instead, as we increase the sampled area more species combinations are realized, and they coexist mainly due to direct pairwise interactions rather than by changes in single-species dominance or by indirect interactions. We also identify a small set of transient species with small population sizes that are consistently found across spatial scales. These findings empirically support the importance of the architecture of species interactions together with demographic stochasticity for driving SARs.

scholarly journals Survival, Growth, and Reproduction: Comparison of Marbled Crayfish with Four Prominent Crayfish Invaders

Biology ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 422
Author(s):  
Antonín Kouba ◽  
Boris Lipták ◽  
Jan Kubec ◽  
Martin Bláha ◽  
Lukáš Veselý ◽  
...  
Keyword(s):  
Interspecific Interactions ◽  
Single Species ◽  
Freshwater Crayfish ◽  
Sympatric Populations ◽  
Intraspecific Interactions ◽  
High Fecundity ◽  
Signal Crayfish ◽  
Early Maturation ◽  
Red Swamp Crayfish ◽  
Marbled Crayfish

Biological invasions are increasingly recognized ecological and economic threats to biodiversity and are projected to increase in the future. Introduced freshwater crayfish in particular are protruding invaders, exerting tremendous impacts on native biodiversity and ecosystem functioning, as exemplified by the North American spiny-cheek, signal and red swamp crayfish as well as the Australian common yabby. The marbled crayfish is among the most outstanding freshwater crayfish invaders due to its parthenogenetic reproduction combined with early maturation and high fecundity. As their introduced ranges expand, their sympatric populations become more frequent. The question of which species and under what circumstances will dominate in their introduced communities is of great interest to biodiversity conservation as it can offer valuable insights for understanding and prioritization of management efforts. In order to examine which of the aforementioned species may be more successful as an invader, we conducted a set of independent trials evaluating survival, growth, claw injury, and reproduction using single-species stocks (intraspecific interactions) and mixed stocks (interspecific interactions) of marbled crayfish vs. other crayfish invaders since the onset of exogenous feeding. In both single and mixed stocks, red swamp crayfish and yabby grew faster than marbled crayfish, while marbled crayfish were superior to both spiny-cheek and signal crayfish in terms of growth. With the exception of signal crayfish, the faster-growing species consistently reached a higher survival rate. The faster-growing species tended to negatively impair smaller counterparts by greater claw injury, delayed maturation, and reduced fecundity. Only marbled crayfish laid eggs as early as 14 weeks in this study, which is earlier than previously reported in the literature. Thus, the success of marbled crayfish among invasive crayfish is significantly driven by relatively fast growth as well as an early and frequent reproduction. These results shed light on how interactions between invasive populations can unfold when their expansion ranges overlap in the wild, thereby contributing to the knowledge base on the complex population dynamics between existing and emerging invasive species.

scholarly journals Community composition and species richness of parasitoids infesting Yponomeuta species in the Netherlands

2004 ◽  
Vol 73 (4) ◽  
pp. 255-261 ◽  
Author(s):  
Daniel F.R. Cleary
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
The Netherlands ◽  
Community Composition ◽  
Host Species ◽  
Community Similarity ◽  
Parasitoid Species ◽  
Temporal And Spatial Variation ◽  
Significant Difference ◽  
Temporal And Spatial

Parasitoid assemblages infesting Yponomeuta species in the Netherlands were investigated. Parasitoid species richness and community composition were related to host species, habitat, temporal and spatial variation. Both community structure and species richness did not differ among habitats. There was no significant difference in species richness between years (1994 and 1995) but there was a significant difference in community composition. Community composition and species richness both differed among host species, although this latter result was solely due to the host species Y. evonymellus. There was no significant relationship between community similarity and distance. These results indicate that the parasitoids of the moth genus Yponomeuta in the Netherlands appear to form a spatially stable, but temporally variable community. Most of the variation in community structure was, however, related to the host species. The marked difference in parasitoid species richness and community composition of Y. evonymellus when compared to the other species warrants further study.

Species richness and redundancy promote persistence of exploited mutualisms in yeast

Science ◽  
2020 ◽  
Vol 370 (6514) ◽  
pp. 346-350 ◽  
Author(s):  
Mayra C. Vidal ◽  
Sheng Pei Wang ◽  
David M. Rivers ◽  
David M. Althoff ◽  
Kari A. Segraves
Keyword(s):  
Species Richness ◽  
Interspecific Interactions ◽  
Functional Redundancy ◽  
Ecological Communities ◽  
Negative Effects ◽  
Community Members ◽  
Pairwise Interactions ◽  
Essential Question ◽  
Diverse Communities ◽  
High Species Richness

Mutualisms, or reciprocally beneficial interspecific interactions, constitute the foundation of many ecological communities and agricultural systems. Mutualisms come in different forms, from pairwise interactions to extremely diverse communities, and they are continually challenged with exploitation by nonmutualistic community members (exploiters). Thus, understanding how mutualisms persist remains an essential question in ecology. Theory suggests that high species richness and functional redundancy could promote mutualism persistence in complex mutualistic communities. Using a yeast system (Saccharomyces cerevisiae), we experimentally show that communities with the greatest mutualist richness and functional redundancy are nearly two times more likely to survive exploitation than are simple communities. Persistence increased because diverse communities were better able to mitigate the negative effects of competition with exploiters. Thus, large mutualistic networks may be inherently buffered from exploitation.

scholarly journals Community of Monogenea in populations of Cichla monoculus from two tributaries of the Amazon River in the Northern Brazil

2019 ◽  
Vol 56 (1) ◽  
pp. 1-10 ◽  
Author(s):  
M. S. B. Oliveira ◽  
E. Aparecido Adriano ◽  
M. Tavares-Dias ◽  
L. Lima Corrêa
Keyword(s):  
Species Richness ◽  
River Basin ◽  
Dominant Species ◽  
Geographic Distance ◽  
Environmental Characteristics ◽  
Mean Intensity ◽  
Northern Brazil ◽  
High Species Richness ◽  
Qualitative Similarity ◽  
Two Populations

SummaryThis study compared the monogeneans community in C. monoculus from the Tapajós River (state of Pará) and Jari River (state of Amapá), northern Brazil. A total of 2188 monogeneans belonging to eight taxa were collected from the gills of fish: Gussevia arilla, Gussevia longihaptor, Gussevia tucunarense, Gussevia undulata, Sciadicleithrum ergensi, Sciadicleithrum umbilicum, Sciadicleithrum uncinatum and Tucunarella cichlae. Gussevia arilla was the dominant species for C. monoculus from the Tapajós River basin, while S. umbilicum predominated among the hosts from the Jari River basin. For the two populations of C. monoculus, the prevalence, mean intensity and mean abundance of monogeneans were different and the of parasites community had a high qualitative similarity (87.5 %). The monogeneans community of C. monoculus was characterized by high species richness, with infection values varying from low to moderate. The geographic distance and differences in environmental characteristics arising from the same did not influence the richness of species of monogeneans infesting C. monoculus in the Tapajós and Jari rivers, but appear to have been determinants in the differences observed in the structure of the monogenean communities in each region.

scholarly journals Symbiont Fauna of Freshwater Zooplankton in Several Water Bodies of the Dnipro River Basin

2018 ◽  
Vol 52 (6) ◽  
pp. 439-450
Author(s):  
T. S. Rybka ◽  
V. I. Yuryshynets
Keyword(s):  
Species Richness ◽  
River Basin ◽  
Host Species ◽  
Water Bodies ◽  
Freshwater Zooplankton ◽  
Parasitic Species ◽  
High Species Richness ◽  
Taxonomic Groups

Abstract In several water bodies of the Dnipro river Basin, parasitological studies of the representatives of main taxonomic groups of freshwater zooplankton (Rotifera, Copepoda and Cladocera) were conducted. Altogether 22 species of different taxonomic groups (bacteria, flagellates, algae, fungi, ciliates, etc.) of symbionts of zooplankters were found. The dataon the symbiofauna of zooplankters and on the aspects of biology of certain epibiotic and parasitic species were summarized. The study showed the peculiarities of symbionts distribution by host species in different taxonomic groups of zooplankton. The number of symbiotic species increased in following order: Rotifera → Cladocera → Copepoda. Copepoda had high species richness of epibiotic ciliates and the highest rates of colonization by epibiotic algae.

Parasitism of ectoparasitic flies on bats in the northern Brazilian cerrado

2013 ◽  
Vol 58 (2) ◽  
Author(s):  
Ciro Santos ◽  
Agostinho Pereira ◽  
Vagner Bastos ◽  
Gustavo Graciolli ◽  
José Rebêlo
Keyword(s):  
Species Richness ◽  
Host Species ◽  
Species Number ◽  
Brazilian Cerrado ◽  
Mean Intensity ◽  
Bat Flies ◽  
Historical Factors ◽  
First Occurrence ◽  
Bat Fly

AbstractIn this work we record the highest number of bat flies species among those already performed in the Brazilian cerrado and discuss the associations and patterns of parasitism of these species and their hosts. A total of 1,390 ectoparasitic flies were collected, belonging to 24 species of Streblidae and one of Nycteribiidae, parasitizing 227 bats of 15 species. Among the species found, the presence of Trichobius sp. on Lonchophylla mordax and the first occurrence of Hershkovitzia sp. on Thyroptera devivoi are highlighted. Lophostoma species presented the highest proportion of individuals with infracommunities and the highest values of parasitological indexes. The high number of bat fly species and hosts, as well as the high values for rates of parasitism and infracommunities, suggests that this area of cerrado has good shelter conditions for these species. The abundance of species and high rates of parasitism detracts from the hypothesis that a higher mean intensity of ectoparasites results from lower competition among flies for hosts in areas with lower ectoparasite species richness. Biogeographical and historical factors of host populations, besides the number of host species and individuals sampled, may contribute to species number and intensity of parasitism.

scholarly journals POTENSI IKAN KARANG DI PERAIRAN PESISIR NEGERI HUKURILA, KECAMATAN LEITIMUR SELATAN KOTA AMBON

2019 ◽  
Vol 15 (2) ◽  
pp. 46-57
Author(s):  
Dicky Sahetapy ◽  
Debby Selanno ◽  
Novianty Tuhumury
Keyword(s):  
Species Richness ◽  
Coral Reef ◽  
Species Diversity ◽  
Reef Fish ◽  
Standing Stock ◽  
Stable Condition ◽  
Underwater Visual Census ◽  
Species Dominance ◽  
Reef Fish Species ◽  
High Species Richness

The Study was conducted on April to May 2019 in the coastal waters of Hukurila village, Leitimur Selatan District of Ambon city with the aims to analyzed taxon composition, species diversity, density, standing stock, potency of target species  and status of reef fish. Reef fish data were collected at four reef stations using UVC method. The result showed that there were 192 species of reef fish inhabit coral reef of Hukurila village. Pomacentridae, Labridae and Chaetodontidae have high species richness, while other seven families have low species richness. Relative diversity of reef fish in the study area can be classified in poor to moderate category, and the estimated number of species of reef fish was 369 species. Species diversity of reef fish is high, with low species dominance  in the community and species evenness of reef fish in their community is in stable condition. Density of reef fish between reef station ranged of 2.9-4.0 ind. m-2. Furthermore, the standing stock of reef fish ranged of 28,840-40,400 ind.ha-1 and biomass of target reef fish species ranged of 1.67-5.14 (± 3.53) tons ha-1 of coral reefs. Status of reef fish in the coral reef of Hukurila village belong to high category. ABSTRAK Penelitian dilakukan dari April sampai Mei 2019 di perairan pesisir Negeri Hukurila, Kecamatan Leitimur Selatan Kota Ambon dengan tujuan menganalisis komposisi taksa, diversitas spesies, densitas, sediaan cadang, potensi ikan karang spesies target dan status ikan karang. Data ikan karang dikumpulkan dari 4 stasiun dengan metode underwater visual census (UVC). Ditemukan 192 spesies ikan karang Menempati terumbu karang Hukurila. Famili Pomacentridae, Labridae, Chaetodontidae memiliki kekayaan spesies tinggi, sementara tujuh famili memiliki kekayaan spesies rendah. Diversitas relatif ikan karang di areal studi termasuk  kategori miskin hingga moderat, dan diestimasi jumlah spesies ikan karang pada habitat terumbu Negeri Hukurila sebanyak 369 spesies. Diversitas spesies ikan karang tinggi, dengan dominansi spesies rendah dalam komunitas dan keserasian spesies ikan karang dalam kondisi Stabil. Densitas ikan karang antara stasiun terumbu berkisar antara 2.9 - 4.0 ind/m2. Sediaan cadang ikan karang antara stasiun terumbu berkisar antara 28.840 - 40.400 ind/ha dan potensi spesies target berkisar 1,67-5,14 (± 3,53) ton/ha terumbu karang. Kondisi ikan karang di terumbu Negeri Hukurila termasuk kategori tinggi. Kata kunci:   Ikan karang, keanekaragaman spesies, kepadatan, sediaan cadang, potensi

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