Evolutionary ecology of Agave : distribution patterns, phylogeny, and coevolution (an homage to Howard S. Gentry)

2021 ◽  
Vol 108 (2) ◽  
pp. 216-235 ◽  
Author(s):  
Luis E. Eguiarte ◽  
Ofelia A. Jiménez Barrón ◽  
Erika Aguirre‐Planter ◽  
Enrique Scheinvar ◽  
Niza Gámez ◽  
...  
Keyword(s):  
Evolutionary Ecology ◽  
Distribution Patterns

scholarly journals Anatomy, functional morphology, evolutionary ecology and systematics of the invasive gastropod Cipangopaludina japonica (Viviparidae: Bellamyinae)

2016 ◽  
Vol 85 (2) ◽  
pp. 235-263 ◽  
Author(s):  
Bert Van Bocxlaer ◽  
Ellen E. Strong
Keyword(s):  
Functional Morphology ◽  
Evolutionary Ecology ◽  
Distribution Patterns ◽  
Reproductive Organs ◽  
Japanese Species ◽  
Shell Size ◽  
High Fecundity ◽  
Form And Function ◽  
Morphometric Analyses ◽  
And Function

The anatomy, functional morphology and evolutionary ecology of the Viviparidae, and the subfamily Bellamyinae in particular, are incompletely known. Partly as a result, genealogical relationships within the family remain poorly understood. Because of this lack in knowledge, few informed hypotheses exist on ancestral states, how differences in body plans between the subfamilies evolved, and how the peculiar biogeographic distribution patterns of viviparids have arisen. Here we document the anatomy, morphology, life history and systematics of Cipangopaludina japonica, a Japanese species that has been introduced into North America, to resolve taxonomic confusion and to improve our understanding of how form and function are related in bellamyines. Anatomical and histological examinations demonstrate marked differences between C. japonicaand other bellamyines in the radula, salivary gland, kidney, nerve ring and reproductive organs. Substantial differences also exist between male and female body organization, but conchological differences between sexes in semi-landmark morphometric analyses are limited. The volume of the brood pouch of females, and hence body and shell size, appear to be good predictors of reproductive success, and the species’ ecological versatility may relate to high fecundity and the ability to alternate between feeding modes. Comparing our observations on C. japonicawith other viviparids and basal Architaenioglossa, we identify several persistent misinterpretations in the literature on how form and function are related in viviparids, not in the least as to female reproductive anatomy. Our reinterpretations improve understanding of the evolution of Viviparidae and its subfamilies, and hopefully will allow future workers to isolate key traits that shaped the evolution of viviparids at the taxonomic levels of their interest for more detailed studies.

scholarly journals BIOGEOGRAFÍA DE ESPONJAS MARINAS (PHYLUM PORIFERA); ESTUDIOS EN EL PACÍFICO ORIENTAL

2012 ◽  
Vol 27 (1) ◽  
pp. 35
Author(s):  
C. Vega ◽  
C. J. Hernández-Guerrero ◽  
J. A. Cruz-Barraza
Keyword(s):  
Molecular Markers ◽  
Evolutionary Ecology ◽  
Distribution Patterns ◽  
Economic Importance ◽  
Marine Sponges ◽  
Eastern Pacific ◽  
Aquatic Animal ◽  
Limited Dispersal ◽  
History Of ◽  
Near Future

Las esponjas (Phylum Porifera) constituyen uno de entre grupos y animales acuáticos más biodiversos y abundantes del planeta. En las últimas décadas han adquirido un creciente interés debido a su importancia evolutiva, ecológica y económica (e.g. biotecnológica). Además de estos aspectos, las esponjas también son interesantes desde el punto de vista biogeográfico, debido a que poseen adultos sésiles y larvas que en general presentan dispersión limitada, lo que permite estudiar la historia de su dispersión. Pese a su importancia, el conocimiento sobre sus patrones de distribución ha sido poco desarrollado. Esta revisión tiene como objetivo presentar el estado del conocimiento biogeográfico de los Porifera, así como dar a conocer un panorama actual de su situación en la región del Pacífico oriental. En general, la falta de un buen conocimiento faunístico de los poríferos en esta región, dificulta el establecimiento de sus relaciones biogeográficas. Durante los últimos años, se ha realizado una intensa campaña para ampliar el conocimiento taxonómico básico, sin embargo, el grado de avance aun no es suficiente, por lo que es importante continuar con el desarrollo de trabajos que aborden estudios faunísticos y los patrones de distribución de los poríferos. Sin duda, con la continuidad que se le está dando a esta labor, y la implementación de marcadores moleculares en la sistemática y biogeografía de los poríferos, en poco tiempo será posible utilizarlos dentro de modelos biogeográficos. Ello nos dará una mayor perspectiva de los patrones de distribución y especiación que ocurren en los océanos, y especialmente en la gran región geográfica del Pacífico oriental. Biogeography of marine sponges (Phylum Porifera); studies in the Eastern Pacific Sponges (Phylum Porifera) constitute one of the more diverse and abundant aquatic animal groups on the planet. In the last decades they have gained great interest due to their evolutionary, ecology and economic importance (e.g., biotechnology). Besides these features, sponges are of much interest to biogeography, because they have sessile adults and larvae with limited dispersal, which allows studying the history of their dispersal. Despite their importance, the knowledge about sponge distribution patterns remains poorly development. The goal of this review is to introduce the biogeography knowledge state, as well as give an actual panorama of their situation in the eastern Pacific. In general, lack of good knowledge about Porifera fauna in this region difficult to establish biogeographical relationships. During the last years an intense campaign has began in order to develop the basic taxonomic knowledge, however, the progress is not enough, there for it is important to continue the development of studies about the distribution patterns of Porifera. These investigations along with the implementation of molecular markers in the systematics and biogeography of Porifera, allow in the near future use the sponges within biogeographic models. This will give us greater insight about the patterns of distribution and speciation in the oceans, particularly in the geographical region of the eastern Pacific.

HUBUNGAN KEPADATAN BIVALVIA DENGAN PARAMETER LINGKUNGAN DI PESISIR TANJUNG PURA KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 13 (2) ◽  
pp. 112-121
Author(s):  
Sudiyar . ◽  
Okto Supratman ◽  
Indra Ambalika Syari
Keyword(s):  
Negative Impact ◽  
Principal Component ◽  
Environmental Parameters ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Random System ◽  
System Method ◽  
Relationship Of ◽  
The Relationship ◽  
Anadara Granosa

The destructive fishing feared will give a negative impact on the survival of this organism. This study aims to analyze the density of bivalves, distribution patterns, and to analyze the relationship of bivalves with environmental parameters in Tanjung Pura village. This research was conducted in March 2019. The systematic random system method was used for collecting data of bivalves. The collecting Data retrieval divided into five research stasions. The results obtained 6 types of bivalves from 3 families and the total is 115 individuals. The highest bivalve density is 4.56 ind / m², and the lowest bivalves are located at station 2,1.56 ind / m²,  The pattern of bivalve distribution in the Coastal of Tanjung Pura Village is grouping. The results of principal component analysis (PCA) showed that Anadara granosa species was positively correlated with TSS r = 0.890, Dosinia contusa, Anomalocardia squamosa, Mererix meretrix, Placamen isabellina, and Tellinella spengleri were positively correlated with currents r = 0.933.

CONDITIONS OF HILLING HABITAT OF CHELONIA MYDAS (GREEN TURTLE) IN PANGUMBAHAN BEACH UJUNG GENTENG, SUKABUMI SELATAN

2019 ◽  
Vol 1 (02) ◽  
pp. 64-67
Author(s):  
Meilisha Putri Pertiwi ◽  
Suci Siti Lathifah
Keyword(s):  
Data Collection ◽  
Surface Temperature ◽  
Green Turtle ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Chelonia Mydas ◽  
Nesting Habitat ◽  
Beach Width ◽  
The Many ◽  
Pandanus Tectorius

Research on the condition of the nesting habitat of Chelonia mydas (green turtle) in Pangumbahan Beach, Ujung Genteng, South Sukabumi has been carried out. Data retrieval is done 6 times for 2 days, 27-28 November 2017 at 3 observation stations. The abiotic parameters measured include surface temperature and depth of 50 cm, surface humidity and depth of 50 cm, beach width, beach slope, and the size of sand grains. While the biotic parameters measured were density, relative density, the frequency of attendance, and distribution patterns of Pandanus tectorius (sea pandanus) vegetation. Based on the results of data processing, the biophysical conditions in Pangumbahan Beach are still suitable for the Chelonia mydas nesting habitat. It also got clear evidence of the many Chelonia mydas landings during the data collection.

Analisis Rantai Nilai Komoditas Cabai Merah

2019 ◽  
Vol 2 (1) ◽  
pp. 336-346
Author(s):  
Dhamon Oridilla B
Keyword(s):  
Distribution Pattern ◽  
Distribution Patterns ◽  
Added Value ◽  
Commodity Chain ◽  
Market Prices ◽  
Data Analyst ◽  
Bargaining Position ◽  
Agricultural Business ◽  
The Government ◽  
Red Peppers

Candi Village in Bandungan District is one of the Chili Supply Sub-district for Semarang Regency and surrounding area has agro-climate suitable for the development of various agricultural commodities supported by wide market opportunity, so it is suitable for agricultural business development. The purpose of this research is to identify the distribution pattern of red pepper, to know each value of commodity chains and distribution, to design alternative distribution pattern of red pepper.Population in this research is 88 respondents from 735 of member of chilli farmer in Desa Candi with total area of 150,3 hectare consisting of rice field, moor and yard. Methods of data analyst using quantitative approach is done by using Margin Marketing Analysis. The results include: (1) The pattern of distribution of existing farming business grows naturally in accordance with the developments and needs of the perpetrators, the actors in this pattern are farmers, wholesalers, collectors, wholesalers, retailers, consumers. (2) The value of the red chili commodity chain in this naturally grown pattern often makes pricing more dominant by traders, so farmers receive prices slightly lower than market prices. (3) Some obstacles faced in distributing red peppers are the difficulty of changing the mindset of the community about advanced farming, this is best utilized by market participants (chain of distribution) who are more informed and always keep abreast of market dynamics. Conventional marketing pattern by farmer cause price level accepted by farmer in general relatively smaller compared to price received by trader. Suggestions shorten the chain of distribution patterns, increase the added value of products and improve the bargaining position of farmers and for the government always guide / accompany farmers in getting accurate market information, which can be used as farmers in bargaining, Increased market transparency can act as a trigger for the functioning of a market, improved competition and increased adaptation to meet the needs of supply and opportunity to compete with market prices. Desa Candi di Kabupaten Bandungan adalah salah satu Kecamatan Penyedia Cabai untuk Kabupaten Semarang dan sekitarnya memiliki agroklimat yang cocok untuk pengembangan berbagai komoditas pertanian yang didukung oleh peluang pasar yang luas, sehingga sangat cocok untuk pengembangan bisnis pertanian. Tujuan dari penelitian ini adalah untuk mengidentifikasi pola distribusi cabai merah, untuk mengetahui masing-masing nilai rantai komoditas dan distribusi, untuk merancang alternatif pola distribusi cabai merah. Populasi dalam penelitian ini adalah 88 responden dari 735 anggota petani cabai di Desa Candi dengan total luas 150,3 hektar yang terdiri dari sawah, tegalan dan pekarangan. Metode analis data menggunakan pendekatan kuantitatif dilakukan dengan menggunakan Analisis Pemasaran Margin. Hasil meliputi: (1) Pola distribusi usaha pertanian yang ada tumbuh secara alami sesuai dengan perkembangan dan kebutuhan pelaku, pelaku dalam pola ini adalah petani, pedagang besar, pengumpul, pedagang besar, pedagang besar, pengecer, konsumen. (2) Nilai rantai komoditas cabai merah dalam pola yang dikembangkan secara alami ini sering membuat penetapan harga lebih dominan oleh para pedagang, sehingga petani menerima harga yang sedikit lebih rendah daripada harga pasar. (3) Beberapa kendala yang dihadapi dalam mendistribusikan paprika merah adalah sulitnya mengubah pola pikir masyarakat tentang pertanian maju, hal ini paling baik digunakan oleh pelaku pasar (rantai distribusi) yang lebih banyak informasi dan selalu mengikuti perkembangan dinamika pasar. Pola pemasaran konvensional oleh petani menyebabkan tingkat harga yang diterima petani pada umumnya relatif lebih kecil dibandingkan dengan harga yang diterima pedagang. Saran mempersingkat rantai pola distribusi, meningkatkan nilai tambah produk dan meningkatkan posisi tawar petani dan bagi pemerintah selalu membimbing / menemani petani dalam mendapatkan informasi pasar yang akurat, yang dapat digunakan sebagai petani dalam tawar-menawar, Peningkatan transparansi pasar dapat bertindak sebagai pemicu berfungsinya pasar, meningkatnya kompetisi dan peningkatan adaptasi untuk memenuhi kebutuhan pasokan dan peluang untuk bersaing dengan harga pasar.

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