Juan M Cancino

Universidad Católica de la Santísima Concepción | UCSC · Departamento de Ecología

Bryozoans provide an excellent model to study relative investment into somatic growth and sexual reproduction, under different environmental conditions. The hippothoid species of the genus Celleporella and the closely related Antarctothoa, produce polymorphic colonies, with autozooids, regarded here as somatic investment, and male and female non-fe...

BRYOZOANS provide an excellent model to study relative investment into somatic growth and sexual reproduction, under different environmental conditions. The hippothoid species of the genus Celleporella and its closely related Antarctothoa, produce polymorphic colonies, with autozooids, regarded here as somatic investment, male and female non-feedin...

The mussels Perumytilus purpuratus and Semimytilus algosus are two dominant species of intertidal rocky shores of central Chile. These species have marked differences in their distribution patterns with P. purpuratus dominating the mid‐intertidal zone and S. algosus dominating the lower intertidal zone usually in habitats influenced by sand. Althou...

Figura 2 incluida en el texto

In the present work we aim at reviewing Roger N. Hughes (May 27th, 1944-August 30th, 2015) contribution to bryozoology using as a tool the citation index of ISI Web of Science (WOS) and Google Scholar (GS). Roger N. Hughes publications are relevant and profusely quoted, with more than 4600 and 9300 citations in WOS and GS, respectively (as recorded...

Resumen: Visto desde el prisma de un biólogo, muchos de los temas planteados por su Santidad en esta Encíclica son objeto habitual de estudio, de análisis y propuestas de las comunidades científicas. La desafiante novedad de la Encíclica es la de elevarlos, desde los círculos científicos especializados, a temas de interés para toda la humanidad....

Epifaunal polychaetes inhabit a range of habitat structures built by other organisms, such as ascidians. Here, we examine: i) the polychaete fauna inhabiting aggregations of the ascidian Pyura chilensis in central Chile; ii) the relationship between sample volume (aggregation size) and poly-chaete assemblage variables; and iii) the effect of a tube...

RESUMEN El ciclo de vida del gusano de la seda, Bombyx mori (L. 1758) inspiró en Santa Teresa de Jesús una de las notables analogías de su Teología Espiritual. Usando lo que le habían contado sobre el origen de la seda, y la existencia de lo que ella llama «la simiente» (huevos), «el gusano» (larva) «el capuchito» (capullo) y «la mariposica» (polil...

Epifaunal polychaetes inhabit a range of habitat structures built by other organisms, such as ascidians. Here, we examine: i) the polychaete fauna inhabiting aggregations of the ascidian Pyura chilensis in central Chile; ii) the relationship between sample volume (aggregation size) and polychaete assemblage variables; and iii) the effect of a tube-...

Encapsulation is a common strategy observed among marine caenogastropods. Although the capsule confers protection for embryos, its rigidity and strength pose a significant challenge as the larvae hatch. The factors that drive hatching among these benthic marine gastropods have scarcely been studied. In this study, we experimentally evaluated whethe...

Intracapsular oxygen availability is one of the main factors affecting embryo development of marine gastropod species with encapsulation. This is because the low solubility and diffusion rate of O(2) in water, plus the low oxygen diffusion rate that the capsule wall presents, reduces oxygen inside capsules. In addition, temperature affects embryo d...

Chorus giganteus shows faster intracapsular embryonic development at high temperature but this is generally associated with a high embryonic mortality and low larval production. The present study was undertaken to determine the optimal combination of temperature and developmental stage for a successful (faster) larval production at high temperature...

Chorus giganteus shows faster intracapsular embryonic development at high temperature but this is generally associated with a high embryonic mortality and low larval production. The present study was undertaken to determine the optimal combination of temperature and developmental stage for a successful (faster) larval production at high temperature...

The muricacean snail Chorus giganteus presents intracapsular development and the occurrence of nurse eggs that are ingested by the early encapsulated embryos indicate both that these snails develop through a lecitotrophic type of development and that reserves would be sufficient to support settlement and metamorphosis. In order to get more informat...

Encapsulating species face more constraints than active brooders in adjusting oxygen supply to the needs of the embryos. Therefore, the packing of embryos in gelatinous egg masses or egg capsules is expected to be adjusted to the temperature and oxygen conditions that the embryos are likely to experience . We studied the patterns of embryo packing...

Despite increasing threats to the marine environment, only a fraction of the biodiversity of the oceans has been described, owing in part to the widespread occurrence of cryptic species. DNA-based barcoding through screening of an orthologous reference gene has been proposed as a powerful tool to uncover biological diversity in the face of dwindlin...

Celleporella hyalina (L.) is an encrusting bryozoan, which has been reported to have a cosmopolitan distribution and a wide occurrence along the Chilean coast. Such distribution is incongruent with what is known of the species' larval biology, since C. hyalina has a larva with a pelagic stage lasting 1.5-4.0 h, which is likely to facilitate reprodu...

Summary A selection of papers presented at the 13th International Conference of the International Bryozoology Association held in Concepción Chile in January 2004 and hosted by the Universidad de Concepción and Universidad Católica de la Santísima Concepción. The topics presented in this volume reflect the diversity of studies on bryozoa with aut...

In the presence of a suitable substratum the lecithotrophic larvae of the bryozoan Bugula flabellata preferentially settle within the first six hours after hatching, whereas a marginal percentage of them (1 %) delay settlement between 6 and 24 h after larval release. In the present study we report that larvae of B. flabellata forced, by mechanical...

In the presence of a suitable substratum the lecithotrophic larvae of the bryozoan Bugula flabellata preferentially settle within the first six hours after hatching, whereas a marginal percentage of them (≈ 1 %) delay settlement between 6 and 24 h after larval release. In the present study we report that larvae of B. flabellata forced, by mechanica...

The present study was undertaken to determine the effects of both extracapsular oxygen concentration and temperature on embryonic development in Chorus giganteus. In normoxia increasing water temperature from 12degreesC to 18degreesC reduced by 15 days the median time required for the capsules to hatch. Hypoxia (oxygen content at 50 % of air satura...

The endemic marine gastropod Chorus giganteus represents a significant part of the benthic biomass subject to heavy exploitation by artisanal fisheries in Chile. Overexploitation has restricted its formerly wide distribution to few sites, and this study deals with the electrophoretic characterisation of three populations from the two main fishing g...

As part of the activities of INACH 05-97 research project carried out in Bahía South, Antarctica, in January 1999, fourty-three species of bryozoans of the orders Cheilostomida (34), Ctenostomida (2) and Cyclostomida (7) were collected by scuba diving. Twenty-one species were new for Bahía South, the total endemism for bryozoans in this area was 72...

San Vicente bay is a heavily industrialised bay located in central Chile, which has a sand beach extending from an area of recreational use in the south to an area of industrial use and discharge in the north. A survey of the macrofauna in the intertidal zone revealed a non-homogeneous distribution; a maximum of five invertebrate species were found...

San Vicente bay is a heavily industrialised bay located in central Chile, which has a sand beach extending from an area of recreational use in the south to an area of industrial use and discharge in the north. A survey of the macrofauna in the intertidal zone revealed a non-homogeneous distribution; a maximum of five invertebrate species were found...

Clusters of egg capsules deposited by some common marine Mollusca may suffer problems of a low diffusive oxygen supply to the embryos they contain, especially if the capsules are exposed to hypoxic seawater or attachment and growth of marine biofouling organisms. The present study was undertaken to determine the effects of severe biofouling by sess...

The ecological studies on the sandy beaches of the Bio-Bio region are scarce, which is worrying since such studies are required to evaluate anthropogenic effects in such systems. The objective of the present study was to determine the specific richness, abundance and distribution pattern of the macroinfauna along the sandy beach at Lenga, Bahia San...

RESUMEN Los estudios ecológicos del intermareal de playas de arena en la región del Bía-Bio son escasos, lo cual es preocupante si se considera que el conocimiento ecológico es básico para evaluar posibles daños antrópicos a estos sistemas. El objetivo del trabajo fue conocer la riqueza, la abundancia y los patrones de distribución de la macroinfau...

Many bryozoans, exemplified by species of Membranipora, are obligate epiphytes. We used laboratory and field experiments to ascertain whether colonies of Membranipora isabelleana benefit from contact with the fronds and exudates of Lessonia trabeculata, their natural substratum in central Chile. Type of substratum, presence or absence of microalgal...

Aplodactylus punctatus is a temperate berbivorous fish that changes from an omnivorous to a herbivorous diet and increases its ability ot assimilate algae as it grows. To investigate whether this dietary shift is related to size-specific differences in energetic demands imposed by metabolism and the amount of assimilated energy, oxygen consumption...

1. Even though herbivorous fish have longer digestive tracts than carnivorous fish, a fact which agrees with optimal digestion theory, the existence of a relation between relative length of the digestive tract and capacity to digest and assimilate algal material has not been experimentally demonstrated. 2. We tested whether an increase in gut dimen...

Traditionally, colonies of encrusting epiphytic bryozoans have been regarded as biotic factors reducing photosynthetic performance in benthic algae. In this study we determined under laboratory conditions the effects of Membranipora tuberculata on the photosynthetic efficiency of the rhodophyte Gelidium rex. Encrusting bryozoans reduce to 44% the i...

Celleporella hyalina broods lecithotrophic larvae that are pelagic for a few hours after release. Colonies of this bryozoan were placed in chambers suspended in the sea. Pre-filtered, ambient water, continuously pumped through the chambers, was delivered into sieves on a fractionator, partitioning the output into hourly samples. Larvae retained by...

Colonies of Membranipora isabelleana and of Celleporella hyalina were grown in complete isolation, in couples, and in groups allowing direct contact among growing edges of conspecifics. M. isabelleana showed great flexibility in the size and age at first reproduction, crowding inducing an early onset of sexuality. For both species, only colonies re...

When appopiate susbtratum is available the lecithotrophic larvae of Cellepolla hyalina (L.) settle within 4 h. In the present study we determined for the first time the capability of these larvea to delay settlement without losing their competence to settle and metamorphose. We also studied the effects of larval swimming time on early colonial grow...

RESUMEN Las macroalgas marinas son utilizadas como sustrato por numerosas especies de briozoos. Estos organismos coloniales suelen cubrir extensas áreas del talo interfiriendo con la luz y disminuyendo la tasa fotosintética del área incrustada. El efecto de los briozoos en la concentración y composición de los pigmentos fotosintetizadores se descon...

Taliepus dentatus and the encrusting bryozoan Membranipora isabelleana coexist in C Chile in tide pools protected from wave action. Fronds of the kelp Lessonia nigrescens are the main source of food of T. dentatus and constitute the substrata for the bryozoans. Crab predation could be important to both colony size and abundance of M. isabelleana. -...

Loco between 2-30mm peristomal length were offered the mussels Semimytilus algosus, Perumytilus purpuratus and Brachidontes granulata; the barnacle Balanus laevis; bryozoans and polychaetes spirorbids. Juveniles showed the following prey preference: S. algosus > P. purpuratus > B. laevis > B. granulata > bryozoans > spirorbids. The drilling mechani...

The present study is the first to correlate information on emersion behaviour and foraging ecology of Sicyases sanguineus, a common clingfish of the Chilean coast. Individuals smaller than 15 cm in total length were frequently found at the highest points in the inter-tidal zone and consumed inter-tidal animals and seaweeds. Fish larger than 23 cm w...

Physiological characteristics of the brooding bivalve Gaimardia bahamondei Osorio & Arnaud, 1984. Medio Ambiente 9(2):13-20 The small marine clam Gaimardia bahamondei, recently described from central Chile, shows the brooding habits common among small sized bivalves. In the present study we report on the rates of oxygen consumption and ammonia excr...

Several species of Membranipora commonly occur on brown and red algae. It is currently believed that these bryozoans could affect growth of the host plant by modifying incident light. In the present study, we report on the changes that occur in both intensity and quality of light passing through colonies of M. tuberculata (Bosc.) and on the effects...

Colonies of Celleporella hyalina (L.), settled on glass Petri dishes, were grown in the Menai Straits. Water flow over the colonies was either unrestricted or increasingly restricted by short and long funnels fitted over the Petri dishes. Under all conditions, colonies grew exponentially for the first few weeks, but then growth decelerated. Growth...

Seaweeds are important items of the Chilean economy, being exported as raw material and used locally for gel extraction (Santelices & Lopehandía 1981). Natural beds of economically important Phaeophyta and Rhodophyta of the Chilean coast are used as substratum by numerous species of sessile animals such as mussels and bryozoans. Although several au...

When starfish are removed from small portions (<63-m 2 areas) of certain marine communities, mussels increase the percentage of space that they occupy. When compared to other studies in New Zealand and Washington State, new results from Chile indicate that none of these assemblages is stable when perturbed in this fashion, ie all attain a different...

Thesis (Ph. D.)--University College of North Wales, 1983. Includes bibliographical references (leaves 99-117). Microfilm.

The Lessonia nigrescens-Durvillaea antarctica belt is the most conspicuous feature of the intertidal-subtidal boundary in Central Chile, with L. nigrescens attaining larger cover and biomass values than D. antarctica. Human predation of the otherwise competitively dominant D. antarctica has been suggested as accounting for its scarcity. Testing of...

Sánchez, M.; Cancino, J., 1980: Fasciculonemertes arenicola gen. et sp. n. (Hoplonemertini Monostilifera) de Chile central. Boletim de Zoologia, Univ. Sao Paulo, Brasil. 5: 149-168 A new monostiliferous hoplonemertean collected in a sandy beach at Los Molles, central Chile, is described. For this characterization the following features were mainly...

Lizard communities in Chile and California have been shown (Fuentes, 1976) to exhibit rock versus ground microhabitat partitioning. In this paper we investigate two hypotheses explaining this phenomenon (1) zonation due to differences in food requirements by the species and (2) zonation due to different needs for hiding places from predators. Obser...

Observations on the spawning behaviour of the commercially important muricid snail Concholepas concholepas are reported. The sequence of events relating to external transportation, molding and hardening, and attachment of the egg capsules to a substratum were timed and divided into 6 major events. The snails studied in the laboratory spawned betwee...

Epifaunal peracarids inhabit a variety of biogenic substrata, including ascidians. Herein we examined the peracarid fauna living on the tunica of the sublittoral ascidian Pyura chilensis growing in offshore and nearshore conditions in Bahía San Vicente, Chile. From a total of 38 samples we collected 17 species of Amphipoda, five Isopoda and two Tan...