scholarly journals A Newly Discovered Forest of the Whip Coral Viminella flagellum (Anthozoa, Alcyonacea) in the Mediterranean Sea: A Non-Invasive Method to Assess Its Population Structure

Biology ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 39
Author(s):  
Giovanni Chimienti ◽  
Ricardo Aguilar ◽  
Michela Maiorca ◽  
Francesco Mastrototaro
Keyword(s):  
Population Structure ◽  
Ad Hoc ◽  
Anthropogenic Impacts ◽  
Tyrrhenian Sea ◽  
Non Invasive ◽  
The Status ◽  
Conservation Actions ◽  
Population Structures ◽  
Invasive Method ◽  
Southern Tyrrhenian Sea

Coral forests are vulnerable marine ecosystems formed by arborescent corals (e.g., Anthozoa of the orders Alcyonacea and Antipatharia). The population structure of the habitat-forming corals can inform on the status of the habitat, representing an essential aspect to monitor. Most Mediterranean corals live in the mesophotic and aphotic zones, and their population structures can be assessed by analyzing images collected by underwater vehicles. This is still not possible in whip-like corals, whose colony lengths and flexibilities impede the taking of direct length measurements from images. This study reports on the occurrence of a monospecific forest, of the whip coral Viminella flagellum in the Aeolian Archipelago (Southern Tyrrhenian Sea; 149 m depth), and the assessment of its population structure through an ad-hoc, non-invasive method to estimate a colony height based on its width. The forest of V. flagellum showed a mean density of 19.4 ± 0.2 colonies m−2 (up to 44.8 colonies m−2) and no signs of anthropogenic impacts. The population was dominated by young colonies, with the presence of large adults and active recruitment. The new model proved to be effective for non-invasive monitoring of this near threatened species, representing a needed step towards appropriate conservation actions.

Distribution patterns and population structure of Illex coindetii (Cephalopoda: Ommastrephidae) in the Southern Tyrrhenian Sea: Historical series of 14 years trawl survey

2011 ◽  
Vol 109 (2-3) ◽  
pp. 342-350 ◽  
Author(s):  
Anna Perdichizzi ◽  
Laura Pirrera ◽  
Daniela Giordano ◽  
Francesco Perdichizzi ◽  
Barbara Busalacchi ◽  
...  
Keyword(s):  
Population Structure ◽  
Distribution Patterns ◽  
Trawl Survey ◽  
Tyrrhenian Sea ◽  
Historical Series ◽  
Southern Tyrrhenian Sea

An insight into the status of the striped dolphins, Stenella coeruleoalba, of the southern Tyrrhenian Sea

2007 ◽  
Vol 87 (5) ◽  
pp. 1321-1326 ◽  
Author(s):  
Caterina Maria Fortuna ◽  
Simonepietro Canese ◽  
Michela Giusti ◽  
Eletta Revelli ◽  
Pierpaolo Consoli ◽  
...  
Keyword(s):  
Line Transect ◽  
Tyrrhenian Sea ◽  
Cetacean Species ◽  
Stenella Coeruleoalba ◽  
Striped Dolphin ◽  
The Status ◽  
Southern Tyrrhenian Sea ◽  
By Catch ◽  
Aeolian Archipelago ◽  
Insight Into

Drift-nets are known to result in high incidental catches of some cetacean species. Despite a UN moratorium on their use in the high seas and a ban in the Mediterranean by all European Union countries, including Italy (EC Reg. 1239/98), some fisheries continue to operate illegally. In 2002 and 2003 three line-transect surveys were conducted in the southern Tyrrhenian Sea around the Aeolian archipelago. These transects were designed to assess the presence, distribution and population size of cetacean species likely to be affected by accidental captures in this area. Data were only sufficient to estimate abundance for the striped dolphin. The best estimate (and first such estimate for this area) was 4030 individuals (CV=0.30, 95% CI=2239–7253) for May 2003. A rough estimate of striped dolphin by-catch, based on floating carcases, was calculated as 36 by-caught animals over a period of 12 days (CV=0.58, 95% CI=11–113). These results, although approximate, are a cause for concern. Conservation and management implications of the results are discussed.

Distribution and population structure of the fishHelicolenus dactylopterus dactylopterus(Delaroche, 1809) in the Central Mediterranean (Southern Tyrrhenian Sea)

2009 ◽  
Vol 30 ◽  
pp. 161-174 ◽  
Author(s):  
Laura Pirrera ◽  
Teresa Bottari ◽  
Barbara Busalacchi ◽  
Daniela Giordano ◽  
Larissa Modica ◽  
...  
Keyword(s):  
Population Structure ◽  
Tyrrhenian Sea ◽  
Central Mediterranean ◽  
Southern Tyrrhenian Sea

scholarly journals Honey Bee Diversity is Swayed by Migratory Beekeeping and Trade Despite Conservation Practices: Genetic Evidences for the Impact of Anthropogenic Factors on Population Structure

2019 ◽  
Author(s):  
Mert Kükrer ◽  
Meral Kence ◽  
Aykut Kence
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
Honey Bee ◽  
Honey Bees ◽  
Anthropogenic Impacts ◽  
Anthropogenic Factors ◽  
Conservation Implications ◽  
The Status ◽  
Bee Diversity ◽  
The Impact

Intense admixture of honey bee (Apis mellifera L.) populations is mostly attributed to migratory beekeeping practices and replacement of queens and colonies with non-native races or hybrids of different subspecies. These two practices are also heavily carried out in Anatolia and Thrace where 5 subspecies reside naturally.Here, we carried out an analysis of population structure of honey bees sampled from six different regions (n = 250) in order to test the genetic impacts of migratory beekeeping, queen and colony trade and conservation efficacy of isolated regions. A total of 30 microsatellite markers were used in four multiplex reactions.Direct genetic impact of migratory beekeeping was demonstrated first time based on a comparison of assignment of individuals to their geographically native populations where migratory colonies showed less fidelity. We found genetic evidence for them acting as a hybrid zone mobile in space and time, becoming vectors of otherwise local gene combinations.The effects of honey bee trade were revealed by the presence of very high introgression levels from the highly commercial Caucasian bees naturally limited to a narrow range. We also measured the direction and magnitude of this gene flow connected with bee trade.Comparison between regions that are either open to migratory beekeeping or not let us evaluate the status of isolated regions as centers of limited gene flow and showed the importance of establishing such regions.Despite signs of gene flow, our findings confirm high levels of geographically structured genetic diversity of four subspecies of honey bees in Turkey and emphasize the need to develop policies to maintain this diversity.Our overall results might potentially bear a wider interest to the community since they constitute an important attempt to quantify the effects of anthropogenic impacts on established patterns of honey bee diversity. Our measurable and justified findings on migratory beekeeping, queen and colony replacements as well as conservation implications will hopefully be of use for the decision makers and other stakeholders.

scholarly journals Towards Non-Invasive Methods to Assess Population Structure and Biomass in Vulnerable Sea Pen Fields

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2255 ◽  
Author(s):  
Giovanni Chimienti ◽  
Attilio Di Nisio ◽  
Anna M. L. Lanzolla ◽  
Gregorio Andria ◽  
Angelo Tursi ◽  
...  
Keyword(s):  
Population Structure ◽  
Ad Hoc ◽  
Dry Weight ◽  
Fresh Weight ◽  
Non Invasive ◽  
Structure And Dynamics ◽  
Northwestern Mediterranean Sea ◽  
Peduncle Length ◽  
Population Structure And Dynamics ◽  
Northwestern Mediterranean

Colonies of the endangered red sea pen Pennatula rubra (Cnidaria: Pennatulacea) sampled by trawling in the northwestern Mediterranean Sea were analyzed. Biometric parameters, such as total length, peduncle length, number of polyp leaves, fresh weight, and dry weight, were measured and related to each other by means of regression analysis. Ad hoc models for future inferencing of colonies size and biomass through visual techniques were individuated in order to allow a non-invasive study of the population structure and dynamics of P. rubra.

A non-invasive method to assess the population structure of the whip coral Ellisella flagellum

2021 ◽  
Author(s):  
Giovanni Chimienti ◽  
Ricardo Aguilar ◽  
Michela Maiorca ◽  
Francesco Mastrototaro
Keyword(s):  
Population Structure ◽  
Non Invasive ◽  
Invasive Method

scholarly journals LA PALMA AMARGA (Sabal mauritiiformis, Arecaceae) EN SISTEMAS PRODUCTIVOS DEL CARIBE COLOMBIANO: ESTUDIO DE CASO EN PIOJÓ, ATLÁNTICO

2015 ◽  
Vol 21 (1) ◽  
Author(s):  
Viviana Andrade-Erazo ◽  
Gloria Galeano
Keyword(s):  
Population Structure ◽  
Resource Availability ◽  
Management Practices ◽  
Size Classes ◽  
Important Resource ◽  
La Palma ◽  
The Status ◽  
Population Structures ◽  
Sabal Mauritiiformis ◽  
Historical Management

<p class="p1"><strong>RESUMEN</strong></p><p class="p2">La palma Sabal mauritiiformis es un recurso importante en el Caribe colombiano debido al uso de sus hojas para techar. Para evaluar el estado de sus poblaciones en Piojó (Atlántico), uno de los municipios más productores de hojas, se estudió la densidad y la estructura poblacional de la palma. Se establecieron 16 parcelas de 0,1 ha, en los tres sistemas de uso de suelo más comunes en la zona: ganadería (6), cultivos (5) y rastrojo (5). Se encontró que la palma amarga constituye un recurso silvestre, muy resistente y capaz de adaptarse a ambientes perturbados pues está incorporada en sistemas productivos de cultivos, rastrojos y ganadería, donde las prácticas de manejo influyen en la densidad y estructura de sus poblaciones. La palma es muy resistente y capaz de adaptarse a ambientes perturbados. El área estudiada incluyó 5349 individuos distribuidos en cuatro categorías de tamaño. Los rastrojos (3620 ± 2808 individuos/hectárea) y los cultivos (5612 ± 3361 ind/ha) presentaron más individuos y mejores estructuras poblacionales que las áreas de ganadería (1488 ± 827 ind/ha), en las cuales se encontraron poblaciones más deterioradas por efecto del pisoteo y el forrajeo. La prevalencia de individuos en algunas clases de tamaño refleja las condiciones de manejo actual e histórico; actividades como el pastoreo o las quemas, sin una apropiada planificación, pueden comprometer el desarrollo de las poblaciones de la palma y la futura disponibilidad del recurso.</p><p class="p1"><strong>ABSTRACT</strong></p><p class="p2">The palm Sabal mauritiiformis is an important resource in the Colombian Caribbean, as its leaves are used for thatching. In order to assess the status of its populations in Piojó (Atlántico department), one of the major leaf producers in the region, palm population structure was studied by randomly establishing 16 sample plots of 0.1 ha in the three major use areas where the palm occurs:: pastures (6), crops (5) and fallows (5). We found that the bitter palm is a heavily exploited wild resource and management practices impact population structure. The bitter palm is a resilient species, easily adaptable to disturbed environments. The studied plots included 5349 individuals, distributed in four size categories. Fallows (3620 ± 2808 individuals / ha) and crops (5612 ± 3361 ind / ha) had more individuals and population structures that reflect a better condition than pastures (1488 ± 827 ind / ha), which had a population structure with discontinuous distributions due to trampling and foraging. Prevalence of individuals in certain size classes reflects current and historical management conditions; activities such as grazing or removal of vegetation by burning, without proper planning, can jeopardize the development of populations and future resource availability.</p>

scholarly journals The status of nature conservation in the developing territories of south and south west Africa

Koedoe ◽  
1977 ◽  
Vol 20 (2) ◽  
Author(s):  
M.J. De Beer
Keyword(s):  
Nature Conservation ◽  
West Africa ◽  
Ad Hoc ◽  
Administrative Staff ◽  
Conservation Action ◽  
The Past ◽  
South West ◽  
The Status ◽  
Conservation Actions ◽  
South West Africa

Comments on the status of nature conservation in an area require an evaluation of progress. Apart from ad hoc nature conservation actions taken in the past by the agricultural and administrative staff of the Department of Bantu Administration and Development (hereafter called the Department) and of the governments of the various developing territories, or homelands, the more formal and specialised nature conservation action by these bodies started almost exactly three years.

scholarly journals Population demography of Oldham’s leaf turtle (Cyclemys oldhamii) in protected and disturbed habitats in Thailand

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7196
Author(s):  
Sengvilay Seateun ◽  
Nancy E. Karraker ◽  
Bryan L. Stuart ◽  
Anchalee Aowphol
Keyword(s):  
Population Structure ◽  
Sexual Dimorphism ◽  
Anthropogenic Impacts ◽  
Size Class ◽  
Freshwater Turtle ◽  
Class Structure ◽  
Population Demography ◽  
Conservation Actions ◽  
Constructed Ponds ◽  
Survival Density

Background Freshwater turtle populations are vulnerable to a range of human activities because of particular life history attributes, and anthropogenic impacts can cause shifts in demographic traits, including survival, density and population structure. Asian freshwater turtles have undergone dramatic population declines in recent decades principally because of collection for food, pet, and traditional medicine markets. Despite this, few studies have been conducted on the population demography of these turtles, thereby limiting our understanding of population trends and the development of conservation actions. Oldham’s leaf turtle (Cyclemys oldhamii) is one of the most commonly traded turtles in Asian markets, but previous published studies have focused solely on systematics. Methods We conducted a mark-recapture study of C. oldhamii at three sites in northeastern Thailand—a protected stream, a degraded stream, and human-constructed ponds—and evaluated differences in survival, density, population structure, and sexual dimorphism among sites. Results We captured 77 turtles at the protected stream, 67 at the constructed ponds, and two in the degraded stream. Survival was 12% lower and density was 35% lower in the constructed ponds than in the protected stream. Size class structure was skewed toward smaller individuals at the constructed ponds, and both sites exhibited subadult-skewed age class structure. Sex ratios were not statistically different than 1:1 at either site and did not differ between sites. We did not document sexual dimorphism in either population. Discussion Explanations for lower survival, lower densities, and skewed size class structure at the constructed ponds include collection for consumption or Buddhist prayer release locally, collection for illegal export from Thailand, predation by domestic dogs associated with humans living nearby, or lower habitat quality. Evidence from our study suggests that collection, either for local use or export, is the most likely explanation for differences in demographic characteristics between the two sites. The information gained from this study may contribute to a status assessment for C. oldhamii and development of conservation actions should they become necessary to protect populations in Thailand.

scholarly journals Honey Bee Diversity is Swayed by Migratory Beekeeping and Trade Despite Conservation Practices: Genetic Evidences for the Impact of Anthropogenic Factors on Population Structure

2017 ◽  
Author(s):  
Mert Kükrer ◽  
Meral Kence ◽  
Aykut Kence
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
Honey Bee ◽  
Honey Bees ◽  
Anthropogenic Impacts ◽  
Anthropogenic Factors ◽  
Conservation Implications ◽  
The Status ◽  
Bee Diversity ◽  
The Impact

AbstractIntense admixture of honey bee (Apis mellifera L.) populations is mostly attributed to migratory beekeeping practices and replacement of queens and colonies with non-native races or hybrids of different subspecies. These two practices are also heavily carried out in Anatolia and Thrace where 5 subspecies reside naturally.Here, we carried out an analysis of population structure of honey bees sampled from six different regions (n = 250) in order to test the genetic impacts of migratory beekeeping, queen and colony trade and conservation efficacy of isolated regions. A total of 30 microsatellite markers were used in four multiplex reactions.Direct genetic impact of migratory beekeeping was demonstrated first time based on a comparison of assignment of individuals to their geographically native populations where migratory colonies showed less fidelity. We found genetic evidence for them acting as a hybrid zone mobile in space and time, becoming vectors of otherwise local gene combinations.The effects of honey bee trade were revealed by the presence of very high introgression levels from the highly commercial Caucasian bees naturally limited to a narrow range. We also measured the direction and magnitude of this gene flow connected with bee trade.Comparison between regions that are either open to migratory beekeeping or not let us evaluate the status of isolated regions as centers of limited gene flow and showed the importance of establishing such regions.Despite signs of gene flow, our findings confirm high levels of geographically structured genetic diversity of four subspecies of honey bees in Turkey and emphasize the need to develop policies to maintain this diversity.Our overall results might potentially bear a wider interest to the community since they constitute an important attempt to quantify the effects of anthropogenic impacts on established patterns of honey bee diversity. Our measurable and justified findings on migratory beekeeping, queen and colony replacements as well as conservation implications will hopefully be of use for the decision makers and other stakeholders.

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